Re: Q0-100 Web-SDR 198Hz frequency error

Simon Brown



If it’s something that simple couldn’t a local ham help – I’m thinking about Robin M0RRX who lives close to the site. I see the dishes from my garden – quite close but a heck of a trek to get around the Helford passage.


Simon Brown, G4ELI


From: <> On Behalf Of Dave G8GKQ
Sent: 22 June 2021 16:20
Subject: Re: [UKMicrowaves] Q0-100 Web-SDR 198Hz frequency error


Hi Andy


The GHY WebSDR was never intended to be a frequency reference, just something to enable a wider audience to monitor the transponder.


I think that it is GPS locked (stable, but not absolutely correct) at the moment, but we have had some recent issues with the GPS [antenna cable].  Unfortunately, site access is difficult at present, and it always means an expensive overnight stay.


Dave, G8GKQ


From: [] On Behalf Of Andy G4JNT
Sent: 22 June 2021 16:09
To: UK Microwaves
Subject: [UKMicrowaves] Q0-100 Web-SDR 198Hz frequency error


Just checked teh Goonhilly Web-SDR and there is close to 200Hz discrepancy in the tone freq between my fully locked receiving system and it


(At 1504z, 22 June 2021) WebSDR tuned to 10489998.00, and the lower keyed tone of the upper beacon comes out at 1681Hz


On my system set at the same tuning point, the tone is 1485Hz


If I generate a local signal at 10490MHz from a separate synth the resulting tone is 2000.00Hz as expected.


Conclusion - Goonhilly Web-SDR  has a frequency locking error




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