[time-nuts] GPSDO - was - oscillator choice question

ernieperes at aol.com ernieperes at aol.com
Mon May 17 20:58:26 UTC 2010


there is a modified W5OJM  GPSDO and all the PCB and so on......please see the flwng link


Basically a well designed mods of the above idea.......and no special parts..... and it runs from 10MHz.....

Rgds Ernie.

-----Original Message-----
From: Bob Camp <lists at rtty.us>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Mon, May 17, 2010 3:40 am
Subject: Re: [time-nuts] GPSDO - was - oscillator choice question

Part of the issue is that some of the thinking on GPSDO's dates back to the era 
f selective availability on GPS.  Designs from that era need to be upgraded to 
eally get them to be all they can be with SA turned off.

n May 16, 2010, at 9:19 PM, Stanley Reynolds wrote:
> Parts for the Brooks Sheera W5OJM design are getting hard to find also need 
he extra divider mod for the 10 Mhz OCXO
 The James Miller G3RUH design is popular for simple if you have the right GPS 
eceiver with 100Khz out.
 VE2ZAZ design has a few issues with ground loops ( a fix is out there) and 
sing the same buffer for all outputs, may also need a buffer amp for the 10811, 
nother mod would be a separate voltage regulator for the ECC voltage.
 I think all three designs would fall short for most on the list, but for me it 
s hard to tell the difference.
 Did you have another design in mind ?
 Now I am reading Time-nuts history and I see that
 there is no consensus on which of the popular/published GPSDO
 configurations is the best return on effort and expense.
 That is rather disappointing.
 Any comments on that before I just flip a coin?
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