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

[AL7CR]

Erich,

Thank you very much for your description.  The procedure and the 
difference between the two functions is now quite clear.

Dean

Erich Eichmann wrote:
> 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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