Empathy List Archives

DR

D. Resor

Thu, Aug 31, 2023 7:23 PM

There is a very reasonably priced working Truetime 468-DC receiver available
for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up with no
definitive answers.

While searching for information concerning the GOES Satellite. I was unable
to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are
still in use.

According the manual there were two options for the GPS antenna, the A-468MS
or the A-468H. Seems these are both more rare than hens teeth, and if found
can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

There is a very reasonably priced working Truetime 468-DC receiver available for purchase. I found and downloaded the Op/Installation guide. I have tried searching for some answers via the internet but came up with no definitive answers. While searching for information concerning the GOES Satellite. I was unable to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are still in use. According the manual there were two options for the GPS antenna, the A-468MS or the A-468H. Seems these are both more rare than hens teeth, and if found can be very expensive. Must one of these two above mentioned antenna models be used, or can newer/later GPS antenna be installed instead? Seems this unit does not suffer from the 25 year calendar roll-back. Opening a can of worms here I'm sure, are there any other condemning considerations I have overlooked? Thank You Don Resor

BC

Bob Camp

Thu, Aug 31, 2023 8:36 PM

Hi

25 years is far enough back that the device may well have had an antenna with
a downconverter in it. This let them move a much lower frequency back to the
device. One result was a savings in cable cost. There still are a few folks that do
this.

Folks have done this or that to build an converter from scratch and mate it up
with a modern antenna. There is no fundamental reason why this can’t be done
for any device if the needed info is available.

Bob

On Aug 31, 2023, at 3:23 PM, D. Resor via time-nuts time-nuts@lists.febo.com wrote:

There is a very reasonably priced working Truetime 468-DC receiver available
for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up with no
definitive answers.

While searching for information concerning the GOES Satellite. I was unable
to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are
still in use.

According the manual there were two options for the GPS antenna, the A-468MS
or the A-468H. Seems these are both more rare than hens teeth, and if found
can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Hi 25 years is far enough back that the device may well have had an antenna with a downconverter in it. This let them move a much lower frequency back to the device. One result was a savings in cable cost. There still are a few folks that do this. Folks have done this or that to build an converter from scratch and mate it up with a modern antenna. There is no fundamental reason why this can’t be done for any device if the needed info is available. Bob > On Aug 31, 2023, at 3:23 PM, D. Resor via time-nuts <time-nuts@lists.febo.com> wrote: > > There is a very reasonably priced working Truetime 468-DC receiver available > for purchase. > > I found and downloaded the Op/Installation guide. > > I have tried searching for some answers via the internet but came up with no > definitive answers. > > While searching for information concerning the GOES Satellite. I was unable > to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are > still in use. > > According the manual there were two options for the GPS antenna, the A-468MS > or the A-468H. Seems these are both more rare than hens teeth, and if found > can be very expensive. > > Must one of these two above mentioned antenna models be used, or can > newer/later GPS antenna be installed instead? > > Seems this unit does not suffer from the 25 year calendar roll-back. > > Opening a can of worms here I'm sure, are there any other condemning > considerations I have overlooked? > > Thank You > > Don Resor > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

PS

paul swed

Thu, Aug 31, 2023 8:43 PM

Don
Its totally worthless unless you like the 7 segment gas discharge display.
That can be readily connected to something with little effort.
Kind of a nice 1 RU box also.
The GOES signal that the dc468 used has been shut off since the 1990s.
I did build a GOES sig simulator and injected it into the decoder chain
using a modern GPS receiver.
Totally silly, but it worked. That also eliminated the troublesome antenna
down converter.
But unless you can pick it up for free without any shipping its useless.
I have seen them on auction sites for silly money and just wonder who might
buy such a thing.
Regards
Paul
WB8TSL

On Thu, Aug 31, 2023 at 4:31 PM D. Resor via time-nuts <
time-nuts@lists.febo.com> wrote:

There is a very reasonably priced working Truetime 468-DC receiver
available
for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up with
no
definitive answers.

While searching for information concerning the GOES Satellite. I was
unable
to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are
still in use.

According the manual there were two options for the GPS antenna, the
A-468MS
or the A-468H. Seems these are both more rare than hens teeth, and if
found
can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Don Its totally worthless unless you like the 7 segment gas discharge display. That can be readily connected to something with little effort. Kind of a nice 1 RU box also. The GOES signal that the dc468 used has been shut off since the 1990s. I did build a GOES sig simulator and injected it into the decoder chain using a modern GPS receiver. Totally silly, but it worked. That also eliminated the troublesome antenna down converter. But unless you can pick it up for free without any shipping its useless. I have seen them on auction sites for silly money and just wonder who might buy such a thing. Regards Paul WB8TSL On Thu, Aug 31, 2023 at 4:31 PM D. Resor via time-nuts < time-nuts@lists.febo.com> wrote: > There is a very reasonably priced working Truetime 468-DC receiver > available > for purchase. > > I found and downloaded the Op/Installation guide. > > I have tried searching for some answers via the internet but came up with > no > definitive answers. > > While searching for information concerning the GOES Satellite. I was > unable > to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are > still in use. > > According the manual there were two options for the GPS antenna, the > A-468MS > or the A-468H. Seems these are both more rare than hens teeth, and if > found > can be very expensive. > > Must one of these two above mentioned antenna models be used, or can > newer/later GPS antenna be installed instead? > > Seems this unit does not suffer from the 25 year calendar roll-back. > > Opening a can of worms here I'm sure, are there any other condemning > considerations I have overlooked? > > Thank You > > Don Resor > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >

TV

Tom Van Baak

Thu, Aug 31, 2023 8:48 PM

Hi Don,

The GOES timing service went off the air almost 20 years ago. An
extremely informative article:

"The GOES Time Code Service, 1974–2004: A Retrospective"
by Michael A. Lombardi and D. Wayne Hanson
https://tf.nist.gov/general/pdf/2013.pdf
also available at:
https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective

The old Truetime receivers are still found on eBay now and then. Some
people buy them just to re-purpose the 1U case and attractive plasma
digital display. The display tubes are sometimes discussed over on the
Neon / Nixie mailing list

/tvb

On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote:

There is a very reasonably priced working Truetime 468-DC receiver available
for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up with no
definitive answers.

While searching for information concerning the GOES Satellite. I was unable
to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are
still in use.

According the manual there were two options for the GPS antenna, the A-468MS
or the A-468H. Seems these are both more rare than hens teeth, and if found
can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

Hi Don, The GOES timing service went off the air almost 20 years ago. An extremely informative article: "The GOES Time Code Service, 1974–2004: A Retrospective" by Michael A. Lombardi and D. Wayne Hanson https://tf.nist.gov/general/pdf/2013.pdf also available at: https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective The old Truetime receivers are still found on eBay now and then. Some people buy them just to re-purpose the 1U case and attractive plasma digital display. The display tubes are sometimes discussed over on the Neon / Nixie mailing list /tvb On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote: > There is a very reasonably priced working Truetime 468-DC receiver available > for purchase. > > I found and downloaded the Op/Installation guide. > > I have tried searching for some answers via the internet but came up with no > definitive answers. > > While searching for information concerning the GOES Satellite. I was unable > to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz are > still in use. > > According the manual there were two options for the GPS antenna, the A-468MS > or the A-468H. Seems these are both more rare than hens teeth, and if found > can be very expensive. > > Must one of these two above mentioned antenna models be used, or can > newer/later GPS antenna be installed instead? > > Seems this unit does not suffer from the 25 year calendar roll-back. > > Opening a can of worms here I'm sure, are there any other condemning > considerations I have overlooked? > > Thank You > > Don Resor

MK

Matt Krick

Fri, Sep 1, 2023 1:13 AM

I'm currently working on a GPS translation board that replaces the RF front
end board inside the unit. It is just about ready to go.

On Thu, Aug 31, 2023, 13:55 Tom Van Baak via time-nuts <
time-nuts@lists.febo.com> wrote:

Hi Don,

The GOES timing service went off the air almost 20 years ago. An
extremely informative article:

"The GOES Time Code Service, 1974–2004: A Retrospective"
by Michael A. Lombardi and D. Wayne Hanson
https://tf.nist.gov/general/pdf/2013.pdf
also available at:

https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective

The old Truetime receivers are still found on eBay now and then. Some
people buy them just to re-purpose the 1U case and attractive plasma
digital display. The display tubes are sometimes discussed over on the
Neon / Nixie mailing list

/tvb

On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote:

There is a very reasonably priced working Truetime 468-DC receiver

available

for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up

with no

definitive answers.

While searching for information concerning the GOES Satellite. I was

unable

to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz

are

still in use.

According the manual there were two options for the GPS antenna, the

A-468MS

or the A-468H. Seems these are both more rare than hens teeth, and if

found

can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

I'm currently working on a GPS translation board that replaces the RF front end board inside the unit. It is just about ready to go. On Thu, Aug 31, 2023, 13:55 Tom Van Baak via time-nuts < time-nuts@lists.febo.com> wrote: > Hi Don, > > The GOES timing service went off the air almost 20 years ago. An > extremely informative article: > > "The GOES Time Code Service, 1974–2004: A Retrospective" > by Michael A. Lombardi and D. Wayne Hanson > https://tf.nist.gov/general/pdf/2013.pdf > also available at: > > https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective > > The old Truetime receivers are still found on eBay now and then. Some > people buy them just to re-purpose the 1U case and attractive plasma > digital display. The display tubes are sometimes discussed over on the > Neon / Nixie mailing list > > /tvb > > On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote: > > There is a very reasonably priced working Truetime 468-DC receiver > available > > for purchase. > > > > I found and downloaded the Op/Installation guide. > > > > I have tried searching for some answers via the internet but came up > with no > > definitive answers. > > > > While searching for information concerning the GOES Satellite. I was > unable > > to determine if the East/West frequencies 468.8250 MHz and 468.8375 MHz > are > > still in use. > > > > According the manual there were two options for the GPS antenna, the > A-468MS > > or the A-468H. Seems these are both more rare than hens teeth, and if > found > > can be very expensive. > > > > Must one of these two above mentioned antenna models be used, or can > > newer/later GPS antenna be installed instead? > > > > Seems this unit does not suffer from the 25 year calendar roll-back. > > > > Opening a can of worms here I'm sure, are there any other condemning > > considerations I have overlooked? > > > > Thank You > > > > Don Resor > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

MK

Matt Krick

Fri, Sep 1, 2023 1:22 AM

The design is based on the original concept and prior artwork by Paul Swed,
WB8TSL.

The design is based on the original concept and prior artwork by Paul Swed, WB8TSL.

DR

D. Resor

Fri, Sep 1, 2023 8:56 AM

Thanks everyone for your help and input. It seemed a bit suspicious that I could not find any current information on what is obviously dead technology.

Don Resor

-----Original Message-----
From: Tom Van Baak via time-nuts time-nuts@lists.febo.com
Sent: Thursday, August 31, 2023 1:49 PM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Cc: Tom Van Baak tvb@LeapSecond.com
Subject: [time-nuts] Re: Kinemetrics Truetime 468-DC usability

Hi Don,

The GOES timing service went off the air almost 20 years ago. An extremely informative article:

"The GOES Time Code Service, 1974–2004: A Retrospective"
by Michael A. Lombardi and D. Wayne Hanson https://tf.nist.gov/general/pdf/2013.pdf
also available at:
https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective

The old Truetime receivers are still found on eBay now and then. Some people buy them just to re-purpose the 1U case and attractive plasma digital display. The display tubes are sometimes discussed over on the Neon / Nixie mailing list

/tvb

On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote:

There is a very reasonably priced working Truetime 468-DC receiver
available for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up
with no definitive answers.

While searching for information concerning the GOES Satellite. I was
unable to determine if the East/West frequencies 468.8250 MHz and
468.8375 MHz are still in use.

According the manual there were two options for the GPS antenna, the
A-468MS or the A-468H. Seems these are both more rare than hens
teeth, and if found can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

Thanks everyone for your help and input. It seemed a bit suspicious that I could not find any current information on what is obviously dead technology. Don Resor -----Original Message----- From: Tom Van Baak via time-nuts <time-nuts@lists.febo.com> Sent: Thursday, August 31, 2023 1:49 PM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Cc: Tom Van Baak <tvb@LeapSecond.com> Subject: [time-nuts] Re: Kinemetrics Truetime 468-DC usability Hi Don, The GOES timing service went off the air almost 20 years ago. An extremely informative article: "The GOES Time Code Service, 1974–2004: A Retrospective" by Michael A. Lombardi and D. Wayne Hanson https://tf.nist.gov/general/pdf/2013.pdf also available at: https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective The old Truetime receivers are still found on eBay now and then. Some people buy them just to re-purpose the 1U case and attractive plasma digital display. The display tubes are sometimes discussed over on the Neon / Nixie mailing list /tvb On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote: > There is a very reasonably priced working Truetime 468-DC receiver > available for purchase. > > I found and downloaded the Op/Installation guide. > > I have tried searching for some answers via the internet but came up > with no definitive answers. > > While searching for information concerning the GOES Satellite. I was > unable to determine if the East/West frequencies 468.8250 MHz and > 468.8375 MHz are still in use. > > According the manual there were two options for the GPS antenna, the > A-468MS or the A-468H. Seems these are both more rare than hens > teeth, and if found can be very expensive. > > Must one of these two above mentioned antenna models be used, or can > newer/later GPS antenna be installed instead? > > Seems this unit does not suffer from the 25 year calendar roll-back. > > Opening a can of worms here I'm sure, are there any other condemning > considerations I have overlooked? > > Thank You > > Don Resor _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

PS

paul swed

Fri, Sep 1, 2023 2:17 PM

Matt
Very happy to see that you designed a more modern version with an Atmel
device and a nice board also.
Glad to see you have a old DC468 working. I always liked the display.
Would love to see your code out of curiosity. Especially how you are
handling the 1 second timing.
Lets see that now means there are 2 DC468s that can display time.... Humor
Thanks
Paul
WB8TSL

On Fri, Sep 1, 2023 at 5:58 AM D. Resor via time-nuts <
time-nuts@lists.febo.com> wrote:

Thanks everyone for your help and input. It seemed a bit suspicious that
I could not find any current information on what is obviously dead
technology.

Don Resor

-----Original Message-----
From: Tom Van Baak via time-nuts time-nuts@lists.febo.com
Sent: Thursday, August 31, 2023 1:49 PM
To: Discussion of precise time and frequency measurement <
time-nuts@lists.febo.com>
Cc: Tom Van Baak tvb@LeapSecond.com
Subject: [time-nuts] Re: Kinemetrics Truetime 468-DC usability

Hi Don,

The GOES timing service went off the air almost 20 years ago. An extremely
informative article:

"The GOES Time Code Service, 1974–2004: A Retrospective"
by Michael A. Lombardi and D. Wayne Hanson
https://tf.nist.gov/general/pdf/2013.pdf
also available at:

https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective

The old Truetime receivers are still found on eBay now and then. Some
people buy them just to re-purpose the 1U case and attractive plasma
digital display. The display tubes are sometimes discussed over on the Neon
/ Nixie mailing list

/tvb

On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote:

There is a very reasonably priced working Truetime 468-DC receiver
available for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up
with no definitive answers.

While searching for information concerning the GOES Satellite. I was
unable to determine if the East/West frequencies 468.8250 MHz and
468.8375 MHz are still in use.

According the manual there were two options for the GPS antenna, the
A-468MS or the A-468H. Seems these are both more rare than hens
teeth, and if found can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an
email to time-nuts-leave@lists.febo.com

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Matt Very happy to see that you designed a more modern version with an Atmel device and a nice board also. Glad to see you have a old DC468 working. I always liked the display. Would love to see your code out of curiosity. Especially how you are handling the 1 second timing. Lets see that now means there are 2 DC468s that can display time.... Humor Thanks Paul WB8TSL On Fri, Sep 1, 2023 at 5:58 AM D. Resor via time-nuts < time-nuts@lists.febo.com> wrote: > Thanks everyone for your help and input. It seemed a bit suspicious that > I could not find any current information on what is obviously dead > technology. > > Don Resor > > -----Original Message----- > From: Tom Van Baak via time-nuts <time-nuts@lists.febo.com> > Sent: Thursday, August 31, 2023 1:49 PM > To: Discussion of precise time and frequency measurement < > time-nuts@lists.febo.com> > Cc: Tom Van Baak <tvb@LeapSecond.com> > Subject: [time-nuts] Re: Kinemetrics Truetime 468-DC usability > > Hi Don, > > The GOES timing service went off the air almost 20 years ago. An extremely > informative article: > > "The GOES Time Code Service, 1974–2004: A Retrospective" > by Michael A. Lombardi and D. Wayne Hanson > https://tf.nist.gov/general/pdf/2013.pdf > also available at: > > https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective > > The old Truetime receivers are still found on eBay now and then. Some > people buy them just to re-purpose the 1U case and attractive plasma > digital display. The display tubes are sometimes discussed over on the Neon > / Nixie mailing list > > /tvb > > On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote: > > There is a very reasonably priced working Truetime 468-DC receiver > > available for purchase. > > > > I found and downloaded the Op/Installation guide. > > > > I have tried searching for some answers via the internet but came up > > with no definitive answers. > > > > While searching for information concerning the GOES Satellite. I was > > unable to determine if the East/West frequencies 468.8250 MHz and > > 468.8375 MHz are still in use. > > > > According the manual there were two options for the GPS antenna, the > > A-468MS or the A-468H. Seems these are both more rare than hens > > teeth, and if found can be very expensive. > > > > Must one of these two above mentioned antenna models be used, or can > > newer/later GPS antenna be installed instead? > > > > Seems this unit does not suffer from the 25 year calendar roll-back. > > > > Opening a can of worms here I'm sure, are there any other condemning > > considerations I have overlooked? > > > > Thank You > > > > Don Resor > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an > email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

PS

paul swed

Fri, Sep 1, 2023 2:23 PM

Sorry I should have mentioned. The display being blank while searching is
normal. If you pop the top there is a switch or jumper that will display
search codes while hunting.
The system absolutely will not do anything without the down converter. But
since there is no satellite signal it doesn't matter.
Thats why in the simulator injects the data directly into the receiver. It
made no sense to build a RF front end to the simulator.
Great discussion.
Regards
Paul
WB8TSL

On Fri, Sep 1, 2023 at 10:17 AM paul swed paulswedb@gmail.com wrote:

Matt
Very happy to see that you designed a more modern version with an Atmel
device and a nice board also.
Glad to see you have a old DC468 working. I always liked the display.
Would love to see your code out of curiosity. Especially how you are
handling the 1 second timing.
Lets see that now means there are 2 DC468s that can display time.... Humor
Thanks
Paul
WB8TSL

On Fri, Sep 1, 2023 at 5:58 AM D. Resor via time-nuts <
time-nuts@lists.febo.com> wrote:

Thanks everyone for your help and input. It seemed a bit suspicious that
I could not find any current information on what is obviously dead
technology.

Don Resor

-----Original Message-----
From: Tom Van Baak via time-nuts time-nuts@lists.febo.com
Sent: Thursday, August 31, 2023 1:49 PM
To: Discussion of precise time and frequency measurement <
time-nuts@lists.febo.com>
Cc: Tom Van Baak tvb@LeapSecond.com
Subject: [time-nuts] Re: Kinemetrics Truetime 468-DC usability

Hi Don,

The GOES timing service went off the air almost 20 years ago. An
extremely informative article:

"The GOES Time Code Service, 1974–2004: A Retrospective"
by Michael A. Lombardi and D. Wayne Hanson
https://tf.nist.gov/general/pdf/2013.pdf
also available at:

https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective

The old Truetime receivers are still found on eBay now and then. Some
people buy them just to re-purpose the 1U case and attractive plasma
digital display. The display tubes are sometimes discussed over on the Neon
/ Nixie mailing list

/tvb

On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote:

There is a very reasonably priced working Truetime 468-DC receiver
available for purchase.

I found and downloaded the Op/Installation guide.

I have tried searching for some answers via the internet but came up
with no definitive answers.

While searching for information concerning the GOES Satellite. I was
unable to determine if the East/West frequencies 468.8250 MHz and
468.8375 MHz are still in use.

According the manual there were two options for the GPS antenna, the
A-468MS or the A-468H. Seems these are both more rare than hens
teeth, and if found can be very expensive.

Must one of these two above mentioned antenna models be used, or can
newer/later GPS antenna be installed instead?

Seems this unit does not suffer from the 25 year calendar roll-back.

Opening a can of worms here I'm sure, are there any other condemning
considerations I have overlooked?

Thank You

Don Resor

time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send
an email to time-nuts-leave@lists.febo.com

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Sorry I should have mentioned. The display being blank while searching is normal. If you pop the top there is a switch or jumper that will display search codes while hunting. The system absolutely will not do anything without the down converter. But since there is no satellite signal it doesn't matter. Thats why in the simulator injects the data directly into the receiver. It made no sense to build a RF front end to the simulator. Great discussion. Regards Paul WB8TSL On Fri, Sep 1, 2023 at 10:17 AM paul swed <paulswedb@gmail.com> wrote: > Matt > Very happy to see that you designed a more modern version with an Atmel > device and a nice board also. > Glad to see you have a old DC468 working. I always liked the display. > Would love to see your code out of curiosity. Especially how you are > handling the 1 second timing. > Lets see that now means there are 2 DC468s that can display time.... Humor > Thanks > Paul > WB8TSL > > On Fri, Sep 1, 2023 at 5:58 AM D. Resor via time-nuts < > time-nuts@lists.febo.com> wrote: > >> Thanks everyone for your help and input. It seemed a bit suspicious that >> I could not find any current information on what is obviously dead >> technology. >> >> Don Resor >> >> -----Original Message----- >> From: Tom Van Baak via time-nuts <time-nuts@lists.febo.com> >> Sent: Thursday, August 31, 2023 1:49 PM >> To: Discussion of precise time and frequency measurement < >> time-nuts@lists.febo.com> >> Cc: Tom Van Baak <tvb@LeapSecond.com> >> Subject: [time-nuts] Re: Kinemetrics Truetime 468-DC usability >> >> Hi Don, >> >> The GOES timing service went off the air almost 20 years ago. An >> extremely informative article: >> >> "The GOES Time Code Service, 1974–2004: A Retrospective" >> by Michael A. Lombardi and D. Wayne Hanson >> https://tf.nist.gov/general/pdf/2013.pdf >> also available at: >> >> https://www.nist.gov/publications/goes-time-code-service-1974-2004-retrospective >> >> The old Truetime receivers are still found on eBay now and then. Some >> people buy them just to re-purpose the 1U case and attractive plasma >> digital display. The display tubes are sometimes discussed over on the Neon >> / Nixie mailing list >> >> /tvb >> >> On 8/31/2023 12:23 PM, D. Resor via time-nuts wrote: >> > There is a very reasonably priced working Truetime 468-DC receiver >> > available for purchase. >> > >> > I found and downloaded the Op/Installation guide. >> > >> > I have tried searching for some answers via the internet but came up >> > with no definitive answers. >> > >> > While searching for information concerning the GOES Satellite. I was >> > unable to determine if the East/West frequencies 468.8250 MHz and >> > 468.8375 MHz are still in use. >> > >> > According the manual there were two options for the GPS antenna, the >> > A-468MS or the A-468H. Seems these are both more rare than hens >> > teeth, and if found can be very expensive. >> > >> > Must one of these two above mentioned antenna models be used, or can >> > newer/later GPS antenna be installed instead? >> > >> > Seems this unit does not suffer from the 25 year calendar roll-back. >> > >> > Opening a can of worms here I'm sure, are there any other condemning >> > considerations I have overlooked? >> > >> > Thank You >> > >> > Don Resor >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send >> an email to time-nuts-leave@lists.febo.com >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com > >