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Re: FT-847 AO-40 and Doppler Uplink Correction?



Hi

You could run the demo copy of Uni_Trac in the background
Every aspect of the up and downlink is automatically calculated.
for AO-40 use.

de

Dave Lamont   ZL2AMD      www.qsl.net/zl2amd/
----- Original Message -----
From: "hasan schiers" <schiers@netins.net>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, July 21, 2001 11:54 PM
Subject: [amsat-bb] FT-847 AO-40 and Doppler Uplink Correction?


>
> I'm showing a doppler of about -26.87 Khz at 0300 utc tonight (predicted).
> I'm trying to pick a freq pair to put into the 847 that will help me find
> myself.
>
> 435.630 up corresponds to 2401.360 down....without doppler.
>
> With -27 khz of doppler at 0300, what would be the predicted frequency I
> would find myself on actually?
>
> How much of the 27 khz of doppler do I need to make up for on the UPLINK
of
> 435.630, in order for me to actually show up on 2401.360?
>
> (I know this is a dumb question, but bear with me)
>
> Listening for the beacon is easy..just subtract doppler from 2401.332 and
> bingo...there it is. My question seems a bit more complicated....what
> adjustment do I apply from a non-doppler corrected uplink freq so that I
> come out on the "predicted" 2401 downlink freq?
>
> The SUB tune function of the 847 is made for VERY slow freq
adjustments...I
> don't want to have to crank the knob for five minutes trying to get close.
I
> want to use the direct keypad entry to get really close, and then use the
> SUB tuning for the minor corrections required to carry on a qso.
>
> Tnx any and all. 73
>
> hasan schiers, NØAN
> schiers@netins.net
>
>
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>
>

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