[amsat-bb] AO-73 - Evening transponder time increasing in Northern Hemisphere

Paul Stoetzer n8hm at arrl.net
Tue Aug 18 15:45:57 UTC 2015

If you need more than 5 watts to hit 25 watts ERP (AMSAT-UK's recommended
power), then feel free to up the output as needed! I find I can get in with
no problems using 5 watts to the Arrow even down to a couple of degrees as
long as there are no obstructions in the way (tree leaves love to suck up
70cm signals, a medium deciduous tree can attenuate 70cm signals by 10.5
dB, so feel free to compensate for this too if you're beaming into trees).
Of course, I am using only 6' of LMR-240 and can switch polarity quickly as
necessary as I'm holding the antenna.

As far as the other FUNcube transponders - 2 of them are already flying
(UKube-1 and EO-79 have the other two). They share the same design and
likely exhibit the same frequency instability. As the satellites are
different (within a 3U and 2U cubesat, respectively) the temperatures may
stay a bit more stable, but we'll have to wait and see when they are made
available for general use.

FUNcube on Nayif-1 will have an improved design and should be more stable.
FUNcube on ESEO will be an L/V FM transponder, so it will be different from
the other four FUNcube units.


Paul, N8HM

On Tuesday, August 18, 2015, W M Willoughby <redski at bellsouth.net> wrote:

> Same story here, Michael. Manual tuning is the only way I ever hear my
> signal, but then only above about 30 degrees elevation. I don't have the
> same troubles on FO-29, etc.  One problem I am in the process of fixing is
> high loss feedlines. Since I am very cautious about using the recommended
> low power, my EIRP is very low. But, the feedlines should be replaced soon
> with LMR-400. I hope the other four Funcubes that are in the pipeline will
> not be as peculiar as AO-73.
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