[amsat-bb] Re: How you do DOPPLER correction in Linear Transponders?

[Fabiano Moser]

Dear friends,
Thank you very much for the answers, help me a lot and now I have better
idea how operators does.
Now I come back to other situation when I do doppler control automatic by
Hamradiodeluxe:

Let make an example at VO-52 using middle of transponder.
While the software is doing correction in the two VFO´s when I start to TX
my signal are always above or below the frequency suggested by computer, and
I need to put OFF uplink adjust at HRD and do by manual to go higher or
lower in Uplink to listen my self. Okay I know the UHF doppler is higher
than VHF, but I presume that HRD always adjust the better adjustment for UP
and DOWN.

At FM satellites this not happen

This make me confused becuase if I have new kepler downloaded, why my audio
always comes above or below the downlink who Hamradiodeluxe adjust on my
FT-847.

73
Fabiano Moser CR7/PY5RX
ARISS-PORTUGAL (Amateur Radio on the International Space Station)
Representative at Teleconference and Portugal Telebridge Coordinator.
AMRAD/AMSAT-CT
http://www.amrad.pt/ariss.php


2009/7/2 i8cvs <domenico.i8cvs at tin.it>

>  ----- Original Message -----
> From: "Fabiano Moser" <fabianomoser at gmail.com>
> To: "amsat-bb" <AMSAT-BB at amsat.org>
> Sent: Thursday, July 02, 2009 6:19 PM
> Subject: [amsat-bb] How you do DOPPLER correction in Linear Transponders?
>
>
> Dear friends,
>
> We know that some Satellite Operators use diferent system to doppler
> control.
>
> For Linear Transponder
> 1) Adjust uplink and downlink automatic by CAT? (Not always woks, some
> times
> I´m up or down from the computer adjust)
> 2) Adjust uplink and downlink manual
> 3) Keep Uplink fixed and adjust only the Downlink frequency.
>
> What is the more indicate method to use?
> FT-847 have knob to adjust Uplink without change downlink VFO, and I´m
> using
> it to keep my voice in downlink at same downlink much I can.
>
> But I know some operators use fixed uplink.
>
> How you do?
>
> --
>
> Hi Fabiano, CR7/PY5RX
>
> My preferred metod (from OSCAR-6 to AO40) is to adjust only the Uplink
> frequency in order to keep my voice in downlink as clear as possible
> exactly
> as you actually do manually.
> If the station in contact with me moves up or down I invite the operator to
> move the VFO of his TX to come again in my constant receiving frequency.
>
> 73" de
> i8CVS Domenico
>
>
>
>
>


-- 
73
Fabiano Moser CR7/PY5RX
ARISS-PORTUGAL (Amateur Radio on the International Space Station)
Representative at Teleconference and Portugal Telebridge Coordinator.
AMRAD/AMSAT-CT
http://www.amrad.pt/ariss.php

"There is no great talent without great will. (Honoré de Balzac)"