[amsat-bb] Making the transponder sats as easy as the fm birds
Paul Stoetzer
n8hm at arrl.net
Sat Apr 14 12:29:40 UTC 2018
The general guidance in the early years of operating linear transponders
was to adjust your transmitter to maintain a constant receive frequency.
Experience with the Mode J transponder on FO-12 caused the gudiance to be
updated to tuning the higher of the two frequencies. See the Sept 14, 1987
Amateur Satellite Report for more details (
http://www.ka9q.net/asr-1987.pdf).
With computer control, it’s a simple matter to adjust both your transmit
and receive frequencies once you get your software calibrated, but for
those tuning manually, the guidance is to tune the higher of the two
frequencies and leave the lower frequency as constant as possible.
Operating linear transponders takes a bit of practice, but it’s fairly easy
and becomes second nature after you get a dozen passes or so under your
belt. There’s no need to think up new schemes to make them “easier.”
73,
Paul, N8HM
On Sat, Apr 14, 2018 at 08:19 Bill Booth <ve3nxk at gmail.com> wrote:
> On 2018-04-13 9:41 PM, Eric Fort wrote:
> > As I understand it, the goal is to adjust your transmitter such that
> your frequency at the satellite is constant.
>
> I have been on the sats since Oscar 6 and the RS series and it was the
> other way
> around I thought. You kept the transmit steady and adjusted the
> receiver. I do
> not use computer control of the rig. I suspect my log has 400 entries.
>
> Did the standard method change or have I been doing it wrong all these
> years
>
> --
> Bill Booth VE3NXK
> Sundridge ON, Canada
> 79.23.37 W x 45.46.18 N
> FN05ns
>
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