[Lowfer] 10MHz GPS locked source G3RUH

[Laurence KL7UK]

Thanks Todd - Im not using the ref source as the LO for the R75, but Im still not convinced I dont have some wander going on :-)  Ill have to wait till I get up to AK to compare sources - the tripler sounds interesting...
 
Cheers
 
Laurence
 

> From: ToddRoberts2001 at aol.com
> Date: Wed, 12 Oct 2011 22:13:30 -0400
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] 10MHz GPS locked source G3RUH
> 
> Hi Laurence,
> I am using a Thunderbolt GPSDO with output at 10MHz. This goes into a Dave 
> Powis G4HUP tripler, model DFS30. The output of the tripler at 30MHz 
> directly drives the R75 timebase circuit in place of the built-in
> oscillator. I don't notice any 0.1Hz wanderings or long term drift so far 
> on QRSS60 or QRSS120 as far as I can tell. The line on the ARGO screen stays 
> as straight as an arrow when receiving WWVB on 60KHz
> for example.
> 73 - Todd WD4NGG
> 
> 
> In a message dated 10/12/2011 9:11:59 P.M. Eastern Daylight Time, 
> hellozerohellozero at hotmail.com writes:
> the scope says its locked - the output at divide by at LF appears 
> completely stable using SL so perhaps I shouldnt worry :-) Does anyone with an R75 
> with a similar set up using GPS "locked" get the same long term wanderings 
> - say up to 0.1Hz over an hour :-) at 10MHz...
> 
> thanks 
> Laurence of Bartlesville OKie
> 
> 
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