Larry, Take a look at Brooks Shera's article in QST. you might know of it.
In my opinion, this has been the 'best ever' description of rolling your
own.
The July, 1998 issueBrooks Shera, W5OJM, titled, "A GPS-Based Frequency
Standard. <https://www.qsl.net/n9zia/wireless/QST_GPS.pdf>"
https://www.qsl.net/n9zia/wireless/QST_GPS.pdf
I build several of these and they made "good" GPSDOs
much has been written about this, and emulating it for other hardware.
https://k6jca.blogspot.com/2018/12/simulating-brooks-shera-w5ojm-gpsdo.html
https://github.com/k6jca/Brooks-Shera-GPSDO
u can still buy the original PCB PCB
http://www.a-aengineering.com/gps.htm
On 20/02/2022 10:59 am, Larry Gadallah wrote:
After poring over the several valuable references people have posted
here, it seems that even the common commercial GPSDOs have
implementation problems, so it seems like there's no (financially
viable) off the shelf solution.
It would indeed be convenient to have a kit option, but I'd image the
potential marked for a GPSDO kit is vanishingly small.
FWIW, I started with a VE2ZAZ board and an Isotemp OCXO and a Motorola
receiver of questionable provenance. Since then I've gathered an HP
10811D and I have an HP E1938A coming (I think), so I have only so far
gathered some essential components that I hope are competent.
On Sat, 19 Feb 2022 at 07:13, Bob kb8tq <[email protected]> wrote:
Hi
Building a kit is very different than a from scratch design. A
Heathkit (to extend the years ago ham radio analogy) radio
was an option when you shopped for your Drake. Building it
would give you some experience.
The Heathkit *design* was done for you and all the complicated
higher level stuff was worked out / tested out / reworked / retested
by somebody else. As long as you put it together correctly, it
worked and was a good radio.
These days there aren’t a lot of folks selling kit GPSDO’s. Even
the kit radio business isn’t what it once was. “I’m going to do
a GPSDO” these days generally means a scratch design.
Bob
On Feb 19, 2022, at 2:41 AM, Bill Beam <[email protected]> wrote:
But there is a magazine article....
<https://www.qsl.net/n9zia/wireless/QST_GPS.pdf>
By Brooks Shera, W5OJM. QST July, 1998.
Following this article I built my unit in 1998 using his PCB and a Motorola UT+.
It has been running almost continuously since then - almost 25 years.
It has been thru several HP 10811 and 10844 oscillators during that time.
Even though Brooks is SK his GPSDO is still running.
Regards.
Bill, NL7F
--
Glen English
RF Communications and Electronics Engineer
CORTEX RF
Pacific Media Technologies Pty Ltd trading as Cortex RF
ABN 40 075 532 008
PO Box 5231 Lyneham ACT 2602, Australia.
au mobile : +61 (0)418 975077
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