I: Re: Offset Correction for CW Beacons in SatPC32

2 Dec 2006

      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@amsat.org [mailto:amsat-bb-bounces@amsat.org]Per
conto di Michael Hatzakis Jr MD
Inviato: sabato 2 dicembre 2006 17.07
A: 'Erich Eichmann'; 'Dean Shutt'
Cc: amsat-bb@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@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
Behalf Of Erich Eichmann
Sent: Saturday, December 02, 2006 3:03 AM
To: Dean Shutt
Cc: amsat-bb@amsat.org
Subject: [amsat-bb] Re: Offset Correction for CW Beacons in SatPC32
Dean,

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.

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@amsat.org
To: erich.eichmann@t-online.de
Cc: amsat-bb@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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Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
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Francesco Grappi

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