CF
Chuck Forsberg WA7KGX N2469R
Wed, Nov 16, 2011 4:47 PM
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
--
Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
--
Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
DR
Dan Rae
Wed, Nov 16, 2011 6:00 PM
On 11/16/2011 8:47 AM, Chuck Forsberg WA7KGX N2469R wrote:
I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
It is the high stability one Chuck if it has the two adjustments and the
doubler. If you are planning on using it I recommend leaving it plugged
in always and just pressing the Standby button when you don't want to
use it which keeps the oven permanently on. This way the oven will be
most stable. Mind you if you use the external timebase input there's no
point in doing that.
Back in the day before T'bolts etc., it was the best oven I had, almost
up to -hp- 10811 standards.
Dan
ac6ao
On 11/16/2011 8:47 AM, Chuck Forsberg WA7KGX N2469R wrote:
> I don't know exactly which
> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
> on the back of the oscillator, The back has separate coarse
> and fine frequency adjustments. Can someone identify which
> timebase is fitted to this counter?
It is the high stability one Chuck if it has the two adjustments and the
doubler. If you are planning on using it I recommend leaving it plugged
in always and just pressing the Standby button when you don't want to
use it which keeps the oven permanently on. This way the oven will be
most stable. Mind you if you use the external timebase input there's no
point in doing that.
Back in the day before T'bolts etc., it was the best oven I had, almost
up to -hp- 10811 standards.
Dan
ac6ao
RA
Robert Atkinson
Wed, Nov 16, 2011 6:02 PM
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
04T is a TCXO 3x10^7 per month & temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day & temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day & temp7x10^9 0-50 deg C
No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
HTH,
Robert G8RPI.
From: Chuck Forsberg WA7KGX N2469R caf@omen.com
To: time-nuts time-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
-- Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
04T is a TCXO 3x10^7 per month & temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day & temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day & temp7x10^9 0-50 deg C
No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
HTH,
Robert G8RPI.
________________________________
From: Chuck Forsberg WA7KGX N2469R <caf@omen.com>
To: time-nuts <time-nuts@febo.com>
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
-- Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
LM
Larry McDavid
Wed, Nov 16, 2011 6:25 PM
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option
that was not ovened and had a single adjustment screw. I replaced it
with a 04A ovened ocxo that has a single adjustment screw. I will
shortly install a 04E ocxo as Robert describes below. There is also a
04B ocxo option with two adjustment screws (coarse and fine). All the
specs are slightly different. My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like
a GPSDO that outputs 10 MHz to set any of the timebase options
accurately. Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute
the GPS-steered 10 MHz to numerous devices that accept an external
timebase, such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
From: Chuck Forsberg WA7KGX N2469Rcaf@omen.com
To: time-nutstime-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
...
Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option
that was not ovened and had a single adjustment screw. I replaced it
with a 04A ovened ocxo that has a single adjustment screw. I will
shortly install a 04E ocxo as Robert describes below. There is also a
04B ocxo option with two adjustment screws (coarse and fine). All the
specs are slightly different. My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like
a GPSDO that outputs 10 MHz to set any of the timebase options
accurately. Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute
the GPS-steered 10 MHz to numerous devices that accept an external
timebase, such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
> Hi Chuck,
> You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
>
> 04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
>
> 04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
>
> 04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
> No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
...
>
> ________________________________
> From: Chuck Forsberg WA7KGX N2469R<caf@omen.com>
> To: time-nuts<time-nuts@febo.com>
> Sent: Wednesday, 16 November 2011, 16:47
> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>
> I found a use for the GPIB interface on my counter - record
> the frequency drift of its internal timebase during warm up.
> It looks like an oven warming up. I don't know exactly which
> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
> on the back of the oscillator, The back has separate coarse
> and fine frequency adjustments. Can someone identify which
> timebase is fitted to this counter?
>
> The link below has the story and plot.
>
> http://www.omen.com/ham/racal.html
...
--
Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
RA
Robert Atkinson
Wed, Nov 16, 2011 7:56 PM
These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
These OCXO's were also used in Racal's frequency standards such as the 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal considered them propriatry and never released any circuits or service information.
All my information comes from Racal manuals and the 1984/85 catalogue.
Robert G8RPI.
From: Larry McDavid lmcdavid@lmceng.com
To: Robert Atkinson robert8rpi@yahoo.co.uk; Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option that was not ovened and had a single adjustment screw. I replaced it with a 04A ovened ocxo that has a single adjustment screw. I will shortly install a 04E ocxo as Robert describes below. There is also a 04B ocxo option with two adjustment screws (coarse and fine). All the specs are slightly different. My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like a GPSDO that outputs 10 MHz to set any of the timebase options accurately. Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the GPS-steered 10 MHz to numerous devices that accept an external timebase, such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
From: Chuck Forsberg WA7KGX N2469Rcaf@omen.com
To: time-nutstime-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
...
-- Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
These OCXO's were also used in Racal's frequency standards such as the 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal considered them propriatry and never released any circuits or service information.
All my information comes from Racal manuals and the 1984/85 catalogue.
Robert G8RPI.
________________________________
From: Larry McDavid <lmcdavid@lmceng.com>
To: Robert Atkinson <robert8rpi@yahoo.co.uk>; Discussion of precise time and frequency measurement <time-nuts@febo.com>
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option that was not ovened and had a single adjustment screw. I replaced it with a 04A ovened ocxo that has a single adjustment screw. I will shortly install a 04E ocxo as Robert describes below. There is also a 04B ocxo option with two adjustment screws (coarse and fine). All the specs are slightly different. My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like a GPSDO that outputs 10 MHz to set any of the timebase options accurately. Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the GPS-steered 10 MHz to numerous devices that accept an external timebase, such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
> Hi Chuck,
> You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
>
> 04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
>
> 04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
>
> 04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
> No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
...
>
> ________________________________
> From: Chuck Forsberg WA7KGX N2469R<caf@omen.com>
> To: time-nuts<time-nuts@febo.com>
> Sent: Wednesday, 16 November 2011, 16:47
> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>
> I found a use for the GPIB interface on my counter - record
> the frequency drift of its internal timebase during warm up.
> It looks like an oven warming up. I don't know exactly which
> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
> on the back of the oscillator, The back has separate coarse
> and fine frequency adjustments. Can someone identify which
> timebase is fitted to this counter?
>
> The link below has the story and plot.
>
> http://www.omen.com/ham/racal.html
...
-- Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
AM
Alan Melia
Wed, Nov 16, 2011 8:26 PM
Hi Robert these were used in the old 9025 and 9026 nixie counters as well.
You can often pick these up for les than the value of the OCXO....blast
there I have given my secret away :-))
My own experience is that these are very good after they have been operated
by someone else, say the military, for a fair time.....I had one that did
just over 1 in 10^9 over a year from a 1975 unit !! OCXO running continually
in the standby mode between use.
Alan
G3NYK
----- Original Message -----
From: "Robert Atkinson" robert8rpi@yahoo.co.uk
To: "Larry McDavid" lmcdavid@lmceng.com; "Discussion of precise time and
frequency measurement" time-nuts@febo.com
Sent: Wednesday, November 16, 2011 7:56 PM
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
These counters used Racal's own 94xx series OCXO's. The 04A normally had a
9442, the 04E had the 9420. Easy way to tell which is which is the size.
They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is
96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to
3x10^7.
These OCXO's were also used in Racal's frequency standards such as the 9478.
They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal
considered them propriatry and never released any circuits or service
information.
All my information comes from Racal manuals and the 1984/85 catalogue.
Robert G8RPI.
From: Larry McDavid lmcdavid@lmceng.com
To: Robert Atkinson robert8rpi@yahoo.co.uk; Discussion of precise time and
frequency measurement time-nuts@febo.com
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option that
was not ovened and had a single adjustment screw. I replaced it with a 04A
ovened ocxo that has a single adjustment screw. I will shortly install a 04E
ocxo as Robert describes below. There is also a 04B ocxo option with two
adjustment screws (coarse and fine). All the specs are slightly different.
My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like a
GPSDO that outputs 10 MHz to set any of the timebase options accurately.
Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the
GPS-steered 10 MHz to numerous devices that accept an external timebase,
such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is
04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg
No 04* is basic crystal oscillator. If yours has a mechanical and
electrical trim it will be a 04A or 04E.
...
From: Chuck Forsberg WA7KGX N2469Rcaf@omen.com
To: time-nutstime-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
Hi Robert these were used in the old 9025 and 9026 nixie counters as well.
You can often pick these up for les than the value of the OCXO....blast
there I have given my secret away :-))
My own experience is that these are very good after they have been operated
by someone else, say the military, for a fair time.....I had one that did
just over 1 in 10^9 over a year from a 1975 unit !! OCXO running continually
in the standby mode between use.
Alan
G3NYK
----- Original Message -----
From: "Robert Atkinson" <robert8rpi@yahoo.co.uk>
To: "Larry McDavid" <lmcdavid@lmceng.com>; "Discussion of precise time and
frequency measurement" <time-nuts@febo.com>
Sent: Wednesday, November 16, 2011 7:56 PM
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
These counters used Racal's own 94xx series OCXO's. The 04A normally had a
9442, the 04E had the 9420. Easy way to tell which is which is the size.
They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is
96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to
3x10^7.
These OCXO's were also used in Racal's frequency standards such as the 9478.
They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal
considered them propriatry and never released any circuits or service
information.
All my information comes from Racal manuals and the 1984/85 catalogue.
Robert G8RPI.
________________________________
From: Larry McDavid <lmcdavid@lmceng.com>
To: Robert Atkinson <robert8rpi@yahoo.co.uk>; Discussion of precise time and
frequency measurement <time-nuts@febo.com>
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option that
was not ovened and had a single adjustment screw. I replaced it with a 04A
ovened ocxo that has a single adjustment screw. I will shortly install a 04E
ocxo as Robert describes below. There is also a 04B ocxo option with two
adjustment screws (coarse and fine). All the specs are slightly different.
My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like a
GPSDO that outputs 10 MHz to set any of the timebase options accurately.
Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the
GPS-steered 10 MHz to numerous devices that accept an external timebase,
such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
> Hi Chuck,
> You need to look at the option sticker on the back of the unit. The 04* is
the oscillator option.
>
> 04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
>
> 04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
>
> 04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg
C
> No 04* is basic crystal oscillator. If yours has a mechanical and
electrical trim it will be a 04A or 04E.
...
>
> ________________________________
> From: Chuck Forsberg WA7KGX N2469R<caf@omen.com>
> To: time-nuts<time-nuts@febo.com>
> Sent: Wednesday, 16 November 2011, 16:47
> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>
> I found a use for the GPIB interface on my counter - record
> the frequency drift of its internal timebase during warm up.
> It looks like an oven warming up. I don't know exactly which
> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
> on the back of the oscillator, The back has separate coarse
> and fine frequency adjustments. Can someone identify which
> timebase is fitted to this counter?
>
> The link below has the story and plot.
>
> http://www.omen.com/ham/racal.html
...
-- Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
JH
John Howell
Wed, Nov 16, 2011 9:49 PM
Robert,
Do you have any information as to where a 9421 stands in this regime, specs etc? It is the same size as the 9420 and has a doubler board attached, but I don't know what equipment it was used in.
Regards,
John H.
On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
These OCXO's were also used in Racal's frequency standards such as the 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal considered them propriatry and never released any circuits or service information.
All my information comes from Racal manuals and the 1984/85 catalogue.
Robert G8RPI.
From: Larry McDavid lmcdavid@lmceng.com
To: Robert Atkinson robert8rpi@yahoo.co.uk; Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option that was not ovened and had a single adjustment screw. I replaced it with a 04A ovened ocxo that has a single adjustment screw. I will shortly install a 04E ocxo as Robert describes below. There is also a 04B ocxo option with two adjustment screws (coarse and fine). All the specs are slightly different. My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like a GPSDO that outputs 10 MHz to set any of the timebase options accurately. Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the GPS-steered 10 MHz to numerous devices that accept an external timebase, such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
From: Chuck Forsberg WA7KGX N2469Rcaf@omen.com
To: time-nutstime-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
Robert,
Do you have any information as to where a 9421 stands in this regime, specs etc? It is the same size as the 9420 and has a doubler board attached, but I don't know what equipment it was used in.
Regards,
John H.
On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
> These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
>
> These OCXO's were also used in Racal's frequency standards such as the 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal considered them propriatry and never released any circuits or service information.
> All my information comes from Racal manuals and the 1984/85 catalogue.
>
> Robert G8RPI.
>
>
>
> ________________________________
> From: Larry McDavid <lmcdavid@lmceng.com>
> To: Robert Atkinson <robert8rpi@yahoo.co.uk>; Discussion of precise time and frequency measurement <time-nuts@febo.com>
> Sent: Wednesday, 16 November 2011, 18:25
> Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>
> There are other Racal timebase options as well.
>
> I have a Racal 1999 counter that originally had a 04C timebase option that was not ovened and had a single adjustment screw. I replaced it with a 04A ovened ocxo that has a single adjustment screw. I will shortly install a 04E ocxo as Robert describes below. There is also a 04B ocxo option with two adjustment screws (coarse and fine). All the specs are slightly different. My manuals do not show a 04T option.
>
> There is also a Rb oscillator option, 04R. I've never seen one of these.
>
> None of these is necessarily on frequency! You must have something like a GPSDO that outputs 10 MHz to set any of the timebase options accurately. Accuracy is relative, of course!
>
> I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the GPS-steered 10 MHz to numerous devices that accept an external timebase, such as the Racal counter.
>
> It's a very nice counter.
>
> Larry W6FUB
>
>
> On 11/16/2011 10:02 AM, Robert Atkinson wrote:
>> Hi Chuck,
>> You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
>>
>> 04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
>>
>> 04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
>>
>> 04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
>> No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
> ...
>>
>> ________________________________
>> From: Chuck Forsberg WA7KGX N2469R<caf@omen.com>
>> To: time-nuts<time-nuts@febo.com>
>> Sent: Wednesday, 16 November 2011, 16:47
>> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>>
>> I found a use for the GPIB interface on my counter - record
>> the frequency drift of its internal timebase during warm up.
>> It looks like an oven warming up. I don't know exactly which
>> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
>> on the back of the oscillator, The back has separate coarse
>> and fine frequency adjustments. Can someone identify which
>> timebase is fitted to this counter?
>>
>> The link below has the story and plot.
>>
>> http://www.omen.com/ham/racal.html
> ...
> -- Best wishes,
>
> Larry McDavid W6FUB
> Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
RA
Robert Atkinson
Wed, Nov 16, 2011 10:05 PM
Hi John,
The 9421 Is 5V power, 9420 is 12V.
Some turned up on ebay UK last year. ex military equipment and about $50 a pair.
From: John Howell j@howell61.f9.co.uk
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, 16 November 2011, 21:49
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
Robert,
Do you have any information as to where a 9421 stands in this regime, specs etc? It is the same size as the 9420 and has a doubler board attached, but I don't know what equipment it was used in.
Regards,
John H.
On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
These OCXO's were also used in Racal's frequency standards such as the 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal considered them propriatry and never released any circuits or service information.
All my information comes from Racal manuals and the 1984/85 catalogue.
Robert G8RPI.
From: Larry McDavid lmcdavid@lmceng.com
To: Robert Atkinson robert8rpi@yahoo.co.uk; Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option that was not ovened and had a single adjustment screw. I replaced it with a 04A ovened ocxo that has a single adjustment screw. I will shortly install a 04E ocxo as Robert describes below. There is also a 04B ocxo option with two adjustment screws (coarse and fine). All the specs are slightly different. My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like a GPSDO that outputs 10 MHz to set any of the timebase options accurately. Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the GPS-steered 10 MHz to numerous devices that accept an external timebase, such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
From: Chuck Forsberg WA7KGX N2469Rcaf@omen.com
To: time-nutstime-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
Hi John,
The 9421 Is 5V power, 9420 is 12V.
Some turned up on ebay UK last year. ex military equipment and about $50 a pair.
________________________________
From: John Howell <j@howell61.f9.co.uk>
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Sent: Wednesday, 16 November 2011, 21:49
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
Robert,
Do you have any information as to where a 9421 stands in this regime, specs etc? It is the same size as the 9420 and has a doubler board attached, but I don't know what equipment it was used in.
Regards,
John H.
On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
> These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
>
> These OCXO's were also used in Racal's frequency standards such as the 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal considered them propriatry and never released any circuits or service information.
> All my information comes from Racal manuals and the 1984/85 catalogue.
>
> Robert G8RPI.
>
>
>
> ________________________________
> From: Larry McDavid <lmcdavid@lmceng.com>
> To: Robert Atkinson <robert8rpi@yahoo.co.uk>; Discussion of precise time and frequency measurement <time-nuts@febo.com>
> Sent: Wednesday, 16 November 2011, 18:25
> Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>
> There are other Racal timebase options as well.
>
> I have a Racal 1999 counter that originally had a 04C timebase option that was not ovened and had a single adjustment screw. I replaced it with a 04A ovened ocxo that has a single adjustment screw. I will shortly install a 04E ocxo as Robert describes below. There is also a 04B ocxo option with two adjustment screws (coarse and fine). All the specs are slightly different. My manuals do not show a 04T option.
>
> There is also a Rb oscillator option, 04R. I've never seen one of these.
>
> None of these is necessarily on frequency! You must have something like a GPSDO that outputs 10 MHz to set any of the timebase options accurately. Accuracy is relative, of course!
>
> I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute the GPS-steered 10 MHz to numerous devices that accept an external timebase, such as the Racal counter.
>
> It's a very nice counter.
>
> Larry W6FUB
>
>
> On 11/16/2011 10:02 AM, Robert Atkinson wrote:
>> Hi Chuck,
>> You need to look at the option sticker on the back of the unit. The 04* is the oscillator option.
>>
>> 04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
>>
>> 04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
>>
>> 04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50 deg C
>> No 04* is basic crystal oscillator. If yours has a mechanical and electrical trim it will be a 04A or 04E.
> ...
>>
>> ________________________________
>> From: Chuck Forsberg WA7KGX N2469R<caf@omen.com>
>> To: time-nuts<time-nuts@febo.com>
>> Sent: Wednesday, 16 November 2011, 16:47
>> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>>
>> I found a use for the GPIB interface on my counter - record
>> the frequency drift of its internal timebase during warm up.
>> It looks like an oven warming up. I don't know exactly which
>> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
>> on the back of the oscillator, The back has separate coarse
>> and fine frequency adjustments. Can someone identify which
>> timebase is fitted to this counter?
>>
>> The link below has the story and plot.
>>
>> http://www.omen.com/ham/racal.html
> ...
> -- Best wishes,
>
> Larry McDavid W6FUB
> Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
DR
Dan Rae
Wed, Nov 16, 2011 10:46 PM
On 11/16/2011 11:56 AM, Robert Atkinson wrote:
These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
Robert, all the 1992s on the US are pretty much ex-US military ones from
the same contract, and all Opt 02M/04E; all these were fitted with a
9462 OCXO which is between the 9420 and 9442 in size but I suspect very
similar or superior to the 9420 in performance. These are the commonly
seen ones with the two adjustments, fine and coarse, visible at the
back. I have seen dozens of these but have never seen one here in the
US with a 9420 fitted.
The 9462 is a very good Oven as I said before, but not a lot of inside
information for it is to be found :^) Having had a few 9442-12s die on
me I did trace out the circuit of those, but that is the only kind, so
far. Touch wood.
Dan
ac6ao / g3ncr
On 11/16/2011 11:56 AM, Robert Atkinson wrote:
> These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E had the 9420. Easy way to tell which is which is the size. They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to 3x10^7.
>
Robert, all the 1992s on the US are pretty much ex-US military ones from
the same contract, and all Opt 02M/04E; all these were fitted with a
9462 OCXO which is between the 9420 and 9442 in size but I suspect very
similar or superior to the 9420 in performance. These are the commonly
seen ones with the two adjustments, fine and coarse, visible at the
back. I have seen dozens of these but have never seen one here in the
US with a 9420 fitted.
The 9462 is a very good Oven as I said before, but not a lot of inside
information for it is to be found :^) Having had a few 9442-12s die on
me I did trace out the circuit of those, but that is the only kind, so
far. Touch wood.
Dan
ac6ao / g3ncr
AM
Alan Melia
Wed, Nov 16, 2011 10:58 PM
Hi John the attached is out of a 1987 catalogue.
Alan
G3NYK
----- Original Message -----
From: "John Howell" j@howell61.f9.co.uk
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Wednesday, November 16, 2011 9:49 PM
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
Robert,
Do you have any information as to where a 9421 stands in this regime,
specs etc? It is the same size as the 9420 and has a doubler board attached,
but I don't know what equipment it was used in.
Regards,
John H.
On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
These counters used Racal's own 94xx series OCXO's. The 04A normally had
a 9442, the 04E had the 9420. Easy way to tell which is which is the size.
They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is
96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to
3x10^7.
These OCXO's were also used in Racal's frequency standards such as the
- They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal
considered them propriatry and never released any circuits or service
information.
Sent: Wednesday, 16 November 2011, 18:25
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option
that was not ovened and had a single adjustment screw. I replaced it with a
04A ovened ocxo that has a single adjustment screw. I will shortly install a
04E ocxo as Robert describes below. There is also a 04B ocxo option with two
adjustment screws (coarse and fine). All the specs are slightly different.
My manuals do not show a 04T option.
There is also a Rb oscillator option, 04R. I've never seen one of these.
None of these is necessarily on frequency! You must have something like
a GPSDO that outputs 10 MHz to set any of the timebase options accurately.
Accuracy is relative, of course!
I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute
the GPS-steered 10 MHz to numerous devices that accept an external timebase,
such as the Racal counter.
It's a very nice counter.
Larry W6FUB
On 11/16/2011 10:02 AM, Robert Atkinson wrote:
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04*
is the oscillator option.
04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50
No 04* is basic crystal oscillator. If yours has a mechanical and
electrical trim it will be a 04A or 04E.
From: Chuck Forsberg WA7KGX N2469Rcaf@omen.com
To: time-nutstime-nuts@febo.com
Sent: Wednesday, 16 November 2011, 16:47
Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to this counter?
The link below has the story and plot.
http://www.omen.com/ham/racal.html
...
-- Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
and follow the instructions there.
and follow the instructions there.
Hi John the attached is out of a 1987 catalogue.
Alan
G3NYK
----- Original Message -----
From: "John Howell" <j@howell61.f9.co.uk>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Wednesday, November 16, 2011 9:49 PM
Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
> Robert,
> Do you have any information as to where a 9421 stands in this regime,
specs etc? It is the same size as the 9420 and has a doubler board attached,
but I don't know what equipment it was used in.
> Regards,
>
> John H.
>
>
>
> On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
>
> > These counters used Racal's own 94xx series OCXO's. The 04A normally had
a 9442, the 04E had the 9420. Easy way to tell which is which is the size.
They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is
96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to
3x10^7.
> >
> > These OCXO's were also used in Racal's frequency standards such as the
9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal
considered them propriatry and never released any circuits or service
information.
> > All my information comes from Racal manuals and the 1984/85 catalogue.
> >
> > Robert G8RPI.
> >
> >
> >
> > ________________________________
> > From: Larry McDavid <lmcdavid@lmceng.com>
> > To: Robert Atkinson <robert8rpi@yahoo.co.uk>; Discussion of precise time
and frequency measurement <time-nuts@febo.com>
> > Sent: Wednesday, 16 November 2011, 18:25
> > Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
> >
> > There are other Racal timebase options as well.
> >
> > I have a Racal 1999 counter that originally had a 04C timebase option
that was not ovened and had a single adjustment screw. I replaced it with a
04A ovened ocxo that has a single adjustment screw. I will shortly install a
04E ocxo as Robert describes below. There is also a 04B ocxo option with two
adjustment screws (coarse and fine). All the specs are slightly different.
My manuals do not show a 04T option.
> >
> > There is also a Rb oscillator option, 04R. I've never seen one of these.
> >
> > None of these is necessarily on frequency! You must have something like
a GPSDO that outputs 10 MHz to set any of the timebase options accurately.
Accuracy is relative, of course!
> >
> > I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute
the GPS-steered 10 MHz to numerous devices that accept an external timebase,
such as the Racal counter.
> >
> > It's a very nice counter.
> >
> > Larry W6FUB
> >
> >
> > On 11/16/2011 10:02 AM, Robert Atkinson wrote:
> >> Hi Chuck,
> >> You need to look at the option sticker on the back of the unit. The 04*
is the oscillator option.
> >>
> >> 04T is a TCXO 3x10^7 per month& temp1x10^6 0-40 deg C
> >>
> >> 04A Ovened oscillator 3x10^9 per Day& temp3x10^9 0-45 deg
> >>
> >> 04E High stability ovened oscillator 5x10^10 per day& temp7x10^9 0-50
deg C
> >> No 04* is basic crystal oscillator. If yours has a mechanical and
electrical trim it will be a 04A or 04E.
> > ...
> >>
> >> ________________________________
> >> From: Chuck Forsberg WA7KGX N2469R<caf@omen.com>
> >> To: time-nuts<time-nuts@febo.com>
> >> Sent: Wednesday, 16 November 2011, 16:47
> >> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
> >>
> >> I found a use for the GPIB interface on my counter - record
> >> the frequency drift of its internal timebase during warm up.
> >> It looks like an oven warming up. I don't know exactly which
> >> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
> >> on the back of the oscillator, The back has separate coarse
> >> and fine frequency adjustments. Can someone identify which
> >> timebase is fitted to this counter?
> >>
> >> The link below has the story and plot.
> >>
> >> http://www.omen.com/ham/racal.html
> > ...
> > -- Best wishes,
> >
> > Larry McDavid W6FUB
> > Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
