[amsat-bb] 70cm loop on satellites

[Hasan al-Basri]

Are you talking about an M2 Eggbeater? I use one on high passes. It (nor
are any other 70cm antennas) worth a darn if surrounded by vegetation or
deciduous trees. Up in the clear, it can do pretty well, but still no where
nearly as good as a small Yagi with fixed elevation.

If you are having full duplex (intermod issues, where your uplink is
trashing your downliink), do the following:

On the RX side put a *good* 2m/70cm duplexer in the shack. If needed put
two back to back for increased isolation.

Use the duplexer(s) as bandpass filters, they work great . Comet 514J works
VERY well here (I put a 50 ohm load on the unused HF port...it's a
triplexer)

I am using an EAntenna interlaced dual band yagi (5 EL on 2m, 8 EL on 70cm)
and have no intermod in full duplex whatsoever. It has a single common
feedpoint at the antenna (no duplexer), and I run two duplexers back to
back in the shack.

See my web page

73, N0AN


Hasan


On Sun, Jan 19, 2020 at 6:50 PM John Geiger via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> My dualband yagi is having a little trouble with full duplex, and I am
> wondering if anyone has used a M squared or other 70cm loop for the uplink
> antenna on the SSB satellites?  Does it work well at getting a good signal
> into the satellites?
>
> 73 John W5TD
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