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Geostationary Beacon is limited

Posted: Tue Sep 22, 2020 9:07 pm
by HB9HCI
The option Geostationary Beacon seems to be limited: Differences (Delta) Beacon frequency - displayed frequency < -100KHz are not selectable. This is a pity because the shift on my pluto is about 110KHz.
Is there a workaround?
tnx Andreas

Re: Geostationary Beacon is limited

Posted: Wed Sep 23, 2020 5:22 am
by Simon G4ELI
Yes, different downconverter offsets.

Re: Geostationary Beacon is limited

Posted: Wed Sep 23, 2020 9:41 am
by HB9HCI
Thanks! Yes it works! (But would be good if no workaround is necessary)

Re: Geostationary Beacon is limited

Posted: Sun Oct 11, 2020 10:46 am
by dg9bfc_sigi
not your pluto is 110kc off but your lnb!
so its not a workaround in my view ... you just guessed that your lnb is accurate (but it is not)
gretz sigi dg9bfc

Re: Geostationary Beacon is limited

Posted: Sun Oct 11, 2020 7:55 pm
by HB9HCI
Yes, Sigi - I agree, it is not a a problem of the pluto. But it would be helpful, if the correction range is increased. (The whole beacon-part is not pluto but lnb related)

Re: Geostationary Beacon is limited

Posted: Mon Oct 12, 2020 12:52 pm
by jdow
The more undisciplined oscillators in your system the worse the calculation problem for applying corrections becomes. At some point it behooves the equipment owner to fix his equipment rather than try to patch it in software.

{o.o}

Re: Geostationary Beacon is limited

Posted: Mon Oct 12, 2020 2:42 pm
by HB9HCI
If it is a lot of work to expand the software to catch the dirty oscillators I agree with jdow. But if it is only justifying some parameters I still hope....

Re: Geostationary Beacon is limited

Posted: Tue Oct 13, 2020 7:30 am
by M0TGC
Simon G4ELI wrote: Wed Sep 23, 2020 5:22 am Yes, different downconverter offsets.
Surely that makes no difference if the geo lock is active. Changing the downconverter offset simply moves the initial frequency of the beacon. Once SDRC has locked, the beacon frequency is fixed regardless of the downconverter offset used.