[amsat-bb] AO-73 tonight at 02:58Z
n8hm at arrl.net
Thu Aug 7 03:14:34 UTC 2014
Worked W5PFG and CO6CBF on the pass. Satellite sounded great as it
always does. With my Arrow and 2 FT-817s, I was able to locate my
downlink with the satellite at about 1.5 degrees of elevation. My
signal was plenty loud at about 2.5 degrees.
On Wed, Aug 6, 2014 at 8:53 PM, Paul Stoetzer <n8hm at arrl.net> wrote:
> Good evening,
> I will be on AO-73 tonight at around 02:58Z, calling CQ at around
> 145.965 MHz. These passes usually don't have much, if any, activity
> and I'd like to drum up a bit more.
> The satellite will enter sunlight at 03:05:45, giving about 7 minutes
> of transponder time here in Washington, DC. I will be operating off a
> south facing balcony, so I will probably lose the satellite about 30
> seconds before the transponder shuts off.
> Tips for working AO-73:
> -Do not use computer control, the transponder frequencies are not
> stable and this will only result in frustration. Besides, manual
> Doppler control is much more fun than letting the computer do all the
> -I usually start a pass by trying to find myself come into the top
> edge of the passband (145.970 MHz). To do this, I usually start
> transmitting around 435.130 MHz and tuning up slowly until I can hear
> myself enter the passband. Then I can move around the transponder
> easily. Remember to tune your uplink to maintain an constant downlink
> frequency (the opposite of FO-29).
> -Keep power output down. The transponder has a very sensitive receiver
> and a very active AGC circuit. Excessive uplink power will not make
> your signal louder - it will only reduce that available for others on
> the transponder. With a clear view of the horizon, 5 watts to an Arrow
> or Elk is plenty for horizon to horizon coverage. Very slightly more
> might be necessary if you are beaming through trees or other
> obstructions, but try to keep power to 25-40 watts ERP.
> Hope to hear you on this evening!
> Paul Stoetzer, N8HM
> Washington, DC
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