[amsat-bb] I: Re: Offset Correction for CW Beacons in SatPC32

[Francesco Grappi]

Yes I agree with you Michael, I read carefully everything
about this matter, thanks Erich for your help!
73" Francesco  IW4DVZ



> -----Messaggio originale-----
> Da: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org]Per
> conto di Michael Hatzakis Jr MD
> Inviato: sabato 2 dicembre 2006 17.07
> A: 'Erich Eichmann'; 'Dean Shutt'
> Cc: amsat-bb at amsat.org
> Oggetto: [amsat-bb] Re: Offset Correction for CW Beacons in SatPC32
>
>
> I want to take a moment to thank Erich for some impressive support of this
> group, thanks, Michael K3MH
>
>
>
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of Erich Eichmann
> Sent: Saturday, December 02, 2006 3:03 AM
> To: Dean Shutt
> Cc: amsat-bb at amsat.org
> Subject: [amsat-bb] Re: Offset Correction for CW Beacons in SatPC32
>
> Dean,
> 1. to calibrate your  2 data lines for each SSB sat  for SSB and CW do
> the following (separately for the SSB and CW entry):
>
> While the satellite is audible calibrate the uplink frequency
> until you hear
> your own voice or CW signal with the best audio pitch. To fine tune the
> uplink frequency use the "Upl. Calibr." controls in menu CAT
> (these controls
> leave the downlink frequency unchanged, so, they change the offset between
> downlink and uplink frequency).
>
> Then click the button "Change/Store Data File". In the menu that
> opens click
> on "Store ...Uplink Calibration". This function saves the new
> offset and at
> next program start you should hear your own signal with the right audio
> pitch or very close to it.
>
> Recently there was a discussion whether to use the button "Change/Store
> .. TX/RX frequency data" to save the calibration. The purpose of that
> function is another one, however, see below.
>
> The calibration  procedure should be done with each SSB satellite, because
> there are hardware depending frequency deviations between the
> single radios.
> So, the frequencies that come with the program can't be optimized for each
> radio. Between my IC-821H and IC-910H, i.e., is a deviation of
> about 1 KHz.
>
> The mode entry in Doppler.SQF (USB, LSB, CW) can be changed only manually
> with Notepad, of course.
>
> 2.
> To start CAT tuning immediately on the beacon frequency of a
> satellite, i.e.
> FO-29, do the following (after you executed the procedure above 1):
>
> While the satellite is audible tune the radio to the satellite's beacon
> signal. That can be done with the VFO knob.
>
> In menu "CAT" click the button "Change/Store Data File" and in
> the menu that
> opens click on "Change/Store RX/TX  Freq. Data".
>
> That will save the new uplink AND downlink frequencies (after eliminating
> the actual Doppler shifts, of course) but leaves the offset unchanged. To
> operate over the satellite you only need to tune off the beacon
> frequency to
> an unused frequency.
>
> (This feature was very helpful with the AO-40 S-band beacon. It allowed to
> easily find the own downlink signal inspite of the daily
> temperature changes
> of the outdoor  downconverter L.O.)
>
> 3.There is a detailed description of these functions in the manual in the
> section regarding menu CAT.
>
> 73s, Erich, DK1TB
>
>
>
>
> ----- Original Message -----
> From: "Dean Shutt" <al7cr at amsat.org>
> To: <erich.eichmann at t-online.de>
> Cc: <amsat-bb at amsat.org>
> Sent: Friday, December 01, 2006 8:56 PM
> Subject: [amsat-bb] Offset Correction for CW Beacons in SatPC32
>
>
> > Erich,
> >
> > Further to a recent question, it appears that I must change the
> > doppler.sqf file to calibrate a cw beacon rather than use the
> > "change/store data file" button.  Is this correct?  I have a seperate
> > line for each SSB sat that tunes the beacon frequency in CW mode and was
> > attempting to adjust for the offsets in my system.
> >
> > Thanks for the help.
> >
> > 73 de Dean, AL7CR
> > _______________________________________________
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>
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