JA
John Ackermann N8UR
Tue, Dec 26, 2006 8:57 PM
My RFTG-m-XO arrived today, and the first thing I had to do was rip it
apart. I've put a series of pictures of the thing in various stages of
disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so the
disassembly is toward a good end...
John
My RFTG-m-XO arrived today, and the first thing I had to do was rip it
apart. I've put a series of pictures of the thing in various stages of
disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so the
disassembly is toward a good end...
John
DJ
Didier Juges
Tue, Dec 26, 2006 9:12 PM
John,
Nice pics!
Did you at least run it to see if it works and what kind of performance
you could get out of it?
Didier KO4BB
John Ackermann N8UR wrote:
My RFTG-m-XO arrived today, and the first thing I had to do was rip it
apart. I've put a series of pictures of the thing in various stages of
disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so the
disassembly is toward a good end...
John
John,
Nice pics!
Did you at least run it to see if it works and what kind of performance
you could get out of it?
Didier KO4BB
John Ackermann N8UR wrote:
> My RFTG-m-XO arrived today, and the first thing I had to do was rip it
> apart. I've put a series of pictures of the thing in various stages of
> disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
> The pictures are full resolution so you should be able to zoom in to
> look at circuit details if you'd like.
>
> When my -Rb arrives, I'll add pictures of it, as well.
>
> I'm planning to repackage both units into a 19 inch rack chassis, so the
> disassembly is toward a good end...
>
> John
>
>
JA
John Ackermann N8UR
Tue, Dec 26, 2006 9:31 PM
Nope, haven't fired it up yet. I'm not sure when that will actually
happen; too many projects going on in the basement! I wanted to get the
pics up to assist anyone else who may be working out the interface
information, so did that before anything else.
John
Didier Juges said the following on 12/26/2006 04:12 PM:
John,
Nice pics!
Did you at least run it to see if it works and what kind of performance
you could get out of it?
Didier KO4BB
John Ackermann N8UR wrote:
My RFTG-m-XO arrived today, and the first thing I had to do was rip it
apart. I've put a series of pictures of the thing in various stages of
disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so the
disassembly is toward a good end...
John
Nope, haven't fired it up yet. I'm not sure when that will actually
happen; too many projects going on in the basement! I wanted to get the
pics up to assist anyone else who may be working out the interface
information, so did that before anything else.
John
----
Didier Juges said the following on 12/26/2006 04:12 PM:
> John,
>
> Nice pics!
>
> Did you at least run it to see if it works and what kind of performance
> you could get out of it?
>
> Didier KO4BB
>
> John Ackermann N8UR wrote:
>> My RFTG-m-XO arrived today, and the first thing I had to do was rip it
>> apart. I've put a series of pictures of the thing in various stages of
>> disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
>> The pictures are full resolution so you should be able to zoom in to
>> look at circuit details if you'd like.
>>
>> When my -Rb arrives, I'll add pictures of it, as well.
>>
>> I'm planning to repackage both units into a 19 inch rack chassis, so the
>> disassembly is toward a good end...
>>
>> John
>>
>>
>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
BH
Bill Hawkins
Wed, Dec 27, 2006 4:06 AM
John,
Many thanks for posting the photos. Now I know that there are
no card edge connectors and no need to find a card rack. The
connectors are not all that difficult to trace. The arrow
pointing to +24 is a help.
What's all this about 15 MHz out?
Bill Hawkins
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of John Ackermann N8UR
Sent: Tuesday, December 26, 2006 3:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RFTG-m-XO disassembly photos
Nope, haven't fired it up yet. I'm not sure when that will actually
happen; too many projects going on in the basement! I wanted to get the
pics up to assist anyone else who may be working out the interface
information, so did that before anything else.
John
Didier Juges said the following on 12/26/2006 04:12 PM:
John,
Nice pics!
Did you at least run it to see if it works and what kind of
performance you could get out of it?
Didier KO4BB
John Ackermann N8UR wrote:
My RFTG-m-XO arrived today, and the first thing I had to do was rip
it apart. I've put a series of pictures of the thing in various
stages of disassembly at
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so
the disassembly is toward a good end...
John
John,
Many thanks for posting the photos. Now I know that there are
no card edge connectors and no need to find a card rack. The
connectors are not all that difficult to trace. The arrow
pointing to +24 is a help.
What's all this about 15 MHz out?
Bill Hawkins
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of John Ackermann N8UR
Sent: Tuesday, December 26, 2006 3:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RFTG-m-XO disassembly photos
Nope, haven't fired it up yet. I'm not sure when that will actually
happen; too many projects going on in the basement! I wanted to get the
pics up to assist anyone else who may be working out the interface
information, so did that before anything else.
John
----
Didier Juges said the following on 12/26/2006 04:12 PM:
> John,
>
> Nice pics!
>
> Did you at least run it to see if it works and what kind of
> performance you could get out of it?
>
> Didier KO4BB
>
> John Ackermann N8UR wrote:
>> My RFTG-m-XO arrived today, and the first thing I had to do was rip
>> it apart. I've put a series of pictures of the thing in various
>> stages of disassembly at
http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
>> The pictures are full resolution so you should be able to zoom in to
>> look at circuit details if you'd like.
>>
>> When my -Rb arrives, I'll add pictures of it, as well.
>>
>> I'm planning to repackage both units into a 19 inch rack chassis, so
>> the disassembly is toward a good end...
>>
>> John
>>
>>
>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
_______________________________________________
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
R
Rex
Wed, Dec 27, 2006 10:30 AM
On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" bill@iaxs.net
wrote:
What's all this about 15 MHz out?
Bill Hawkins
I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
came in a metal box that also contained a circuit board that provided 3
TNC output connectors. Two of those had 10 MHz square wave output. One
provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
sine. I never figured out exactly how they were doing this; the board
had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
now suspect my box must have been for a similar setup to the Lucent
application.
In the FRS box I noticed a 15 MHz filter on the board. If you look at
John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
Efratom oscillator) is a 15 MHz filter.
On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <bill@iaxs.net>
wrote:
>What's all this about 15 MHz out?
>
>Bill Hawkins
I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
came in a metal box that also contained a circuit board that provided 3
TNC output connectors. Two of those had 10 MHz square wave output. One
provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
sine. I never figured out exactly how they were doing this; the board
had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
now suspect my box must have been for a similar setup to the Lucent
application.
In the FRS box I noticed a 15 MHz filter on the board. If you look at
John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
Efratom oscillator) is a 15 MHz filter.
DB
Dr Bruce Griffiths
Wed, Dec 27, 2006 10:52 AM
On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" bill@iaxs.net
wrote:
What's all this about 15 MHz out?
Bill Hawkins
I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
came in a metal box that also contained a circuit board that provided 3
TNC output connectors. Two of those had 10 MHz square wave output. One
provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
sine. I never figured out exactly how they were doing this; the board
had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
now suspect my box must have been for a similar setup to the Lucent
application.
In the FRS box I noticed a 15 MHz filter on the board. If you look at
John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
Efratom oscillator) is a 15 MHz filter.
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Rex, Bill
The simplest way of generating a 15MHz output signal from a 10MHz input
signal, is to divide the 10MHz by 2 using a flipflop and then extract
the 15MHz 3rd harmonic component of the 5MHz square wave output of the
flipflop with an analog bandpass filter.
Bruce
Rex wrote:
> On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <bill@iaxs.net>
> wrote:
>
>
>> What's all this about 15 MHz out?
>>
>> Bill Hawkins
>>
>
> I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
> came in a metal box that also contained a circuit board that provided 3
> TNC output connectors. Two of those had 10 MHz square wave output. One
> provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
>
> The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
> sine. I never figured out exactly how they were doing this; the board
> had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
> now suspect my box must have been for a similar setup to the Lucent
> application.
>
> In the FRS box I noticed a 15 MHz filter on the board. If you look at
> John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
> Efratom oscillator) is a 15 MHz filter.
>
>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
Rex, Bill
The simplest way of generating a 15MHz output signal from a 10MHz input
signal, is to divide the 10MHz by 2 using a flipflop and then extract
the 15MHz 3rd harmonic component of the 5MHz square wave output of the
flipflop with an analog bandpass filter.
Bruce
DB
Dr Bruce Griffiths
Wed, Dec 27, 2006 11:27 AM
Dr Bruce Griffiths wrote:
On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" bill@iaxs.net
wrote:
What's all this about 15 MHz out?
Bill Hawkins
I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
came in a metal box that also contained a circuit board that provided 3
TNC output connectors. Two of those had 10 MHz square wave output. One
provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
sine. I never figured out exactly how they were doing this; the board
had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
now suspect my box must have been for a similar setup to the Lucent
application.
In the FRS box I noticed a 15 MHz filter on the board. If you look at
John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
Efratom oscillator) is a 15 MHz filter.
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Rex, Bill
The simplest way of generating a 15MHz output signal from a 10MHz input
signal, is to divide the 10MHz by 2 using a flipflop and then extract
the 15MHz 3rd harmonic component of the 5MHz square wave output of the
flipflop with an analog bandpass filter.
Bruce
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Rex, Bill
A low added phase noise technique for generating 15MHz from a 10MHz input is to use a regenerative divider comprising a low noise Schottky diode mixer, a pair of amplifies, a couple of low pass filters and a 15MHz bandpass filter.
A regenerative divider with an input signal of frequency f Hz can produce 2 signals outputs with frequencies of f/2 and 3f/2 respectively.
Bruce
Dr Bruce Griffiths wrote:
> Rex wrote:
>
>> On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <bill@iaxs.net>
>> wrote:
>>
>>
>>
>>> What's all this about 15 MHz out?
>>>
>>> Bill Hawkins
>>>
>>>
>> I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
>> came in a metal box that also contained a circuit board that provided 3
>> TNC output connectors. Two of those had 10 MHz square wave output. One
>> provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
>>
>> The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
>> sine. I never figured out exactly how they were doing this; the board
>> had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
>> now suspect my box must have been for a similar setup to the Lucent
>> application.
>>
>> In the FRS box I noticed a 15 MHz filter on the board. If you look at
>> John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
>> Efratom oscillator) is a 15 MHz filter.
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list
>> time-nuts@febo.com
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>
>>
>>
> Rex, Bill
>
> The simplest way of generating a 15MHz output signal from a 10MHz input
> signal, is to divide the 10MHz by 2 using a flipflop and then extract
> the 15MHz 3rd harmonic component of the 5MHz square wave output of the
> flipflop with an analog bandpass filter.
>
> Bruce
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
Rex, Bill
A low added phase noise technique for generating 15MHz from a 10MHz input is to use a regenerative divider comprising a low noise Schottky diode mixer, a pair of amplifies, a couple of low pass filters and a 15MHz bandpass filter.
A regenerative divider with an input signal of frequency f Hz can produce 2 signals outputs with frequencies of f/2 and 3f/2 respectively.
Bruce
B
bg@lysator.liu.se
Wed, Dec 27, 2006 11:45 AM
On Wed, December 27, 2006 11:30, Rex said:
On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" bill@iaxs.net
wrote:
What's all this about 15 MHz out?
Bill Hawkins
I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
came in a metal box that also contained a circuit board that provided 3
TNC output connectors. Two of those had 10 MHz square wave output. One
provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
sine. I never figured out exactly how they were doing this; the board
had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
now suspect my box must have been for a similar setup to the Lucent
application.
In the FRS box I noticed a 15 MHz filter on the board. If you look at
John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
Efratom oscillator) is a 15 MHz filter.
Also got one of those FRS-C boxes. Note that the FRS-C is the TTL-output
version. That is usually not adverticed by the ebay sellers.
--
Björn
On Wed, December 27, 2006 11:30, Rex said:
> On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <bill@iaxs.net>
> wrote:
>
>>What's all this about 15 MHz out?
>>
>>Bill Hawkins
>
> I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It
> came in a metal box that also contained a circuit board that provided 3
> TNC output connectors. Two of those had 10 MHz square wave output. One
> provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output.
>
> The board somehow used the 10 MHz from the rubidium to generate a 15 MHz
> sine. I never figured out exactly how they were doing this; the board
> had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I
> now suspect my box must have been for a similar setup to the Lucent
> application.
>
> In the FRS box I noticed a 15 MHz filter on the board. If you look at
> John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the
> Efratom oscillator) is a 15 MHz filter.
Also got one of those FRS-C boxes. Note that the FRS-C is the TTL-output
version. That is usually not adverticed by the ebay sellers.
--
Björn
JA
John Ackermann N8UR
Wed, Dec 27, 2006 1:57 PM
The 15MHz out surprised me to. I haven't traced out the circuits but
from a couple of the components, I am guessing that they do something
like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2.
However, it also looks like it should be easy to bypass that stuff and
get right to the 10MHz if you want.
I'm planning to ditch the enclosure and put both the m-XO and m-Rb
packages in a 1U rack chassis, using jumpers to get the appropriate
signals from the boards to each other and to the front panel.
John
Bill Hawkins said the following on 12/26/2006 11:06 PM:
John,
Many thanks for posting the photos. Now I know that there are
no card edge connectors and no need to find a card rack. The
connectors are not all that difficult to trace. The arrow
pointing to +24 is a help.
What's all this about 15 MHz out?
Bill Hawkins
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of John Ackermann N8UR
Sent: Tuesday, December 26, 2006 3:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RFTG-m-XO disassembly photos
Nope, haven't fired it up yet. I'm not sure when that will actually
happen; too many projects going on in the basement! I wanted to get the
pics up to assist anyone else who may be working out the interface
information, so did that before anything else.
John
Didier Juges said the following on 12/26/2006 04:12 PM:
John,
Nice pics!
Did you at least run it to see if it works and what kind of
performance you could get out of it?
Didier KO4BB
John Ackermann N8UR wrote:
My RFTG-m-XO arrived today, and the first thing I had to do was rip
it apart. I've put a series of pictures of the thing in various
stages of disassembly at
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so
the disassembly is toward a good end...
John
The 15MHz out surprised me to. I haven't traced out the circuits but
from a couple of the components, I am guessing that they do something
like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2.
However, it also looks like it should be easy to bypass that stuff and
get right to the 10MHz if you want.
I'm planning to ditch the enclosure and put both the m-XO and m-Rb
packages in a 1U rack chassis, using jumpers to get the appropriate
signals from the boards to each other and to the front panel.
John
----
Bill Hawkins said the following on 12/26/2006 11:06 PM:
> John,
>
> Many thanks for posting the photos. Now I know that there are
> no card edge connectors and no need to find a card rack. The
> connectors are not all that difficult to trace. The arrow
> pointing to +24 is a help.
>
> What's all this about 15 MHz out?
>
> Bill Hawkins
>
>
> -----Original Message-----
> From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
> Behalf Of John Ackermann N8UR
> Sent: Tuesday, December 26, 2006 3:32 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] RFTG-m-XO disassembly photos
>
> Nope, haven't fired it up yet. I'm not sure when that will actually
> happen; too many projects going on in the basement! I wanted to get the
> pics up to assist anyone else who may be working out the interface
> information, so did that before anything else.
>
> John
> ----
>
> Didier Juges said the following on 12/26/2006 04:12 PM:
>> John,
>>
>> Nice pics!
>>
>> Did you at least run it to see if it works and what kind of
>> performance you could get out of it?
>>
>> Didier KO4BB
>>
>> John Ackermann N8UR wrote:
>>> My RFTG-m-XO arrived today, and the first thing I had to do was rip
>>> it apart. I've put a series of pictures of the thing in various
>>> stages of disassembly at
> http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
>>> The pictures are full resolution so you should be able to zoom in to
>>> look at circuit details if you'd like.
>>>
>>> When my -Rb arrives, I'll add pictures of it, as well.
>>>
>>> I'm planning to repackage both units into a 19 inch rack chassis, so
>>> the disassembly is toward a good end...
>>>
>>> John
>>>
>>>
>>
>> _______________________________________________
>> time-nuts mailing list
>> time-nuts@febo.com
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>
>>
>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
DB
Dr Bruce Griffiths
Wed, Dec 27, 2006 9:35 PM
John Ackermann N8UR wrote:
The 15MHz out surprised me to. I haven't traced out the circuits but
from a couple of the components, I am guessing that they do something
like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2.
John
That is not likely to be the scheme used, as there appears to be no
30MHz bandpass filter.
The alternative technique of dividing the 10MHz by 2 and then extracting
the 3rd harmonic of the resultant 5MHz square wave is more likely.
Bruce
John Ackermann N8UR wrote:
> The 15MHz out surprised me to. I haven't traced out the circuits but
> from a couple of the components, I am guessing that they do something
> like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2.
>
John
That is not likely to be the scheme used, as there appears to be no
30MHz bandpass filter.
The alternative technique of dividing the 10MHz by 2 and then extracting
the 3rd harmonic of the resultant 5MHz square wave is more likely.
Bruce
