Re: [sarex] ISS FREQUENCIES

[tlang@xxxxxxxxxxxxxxxxxxxx (Tony Langdon)]

Hello Bruce!

30 Oct 00 06:46, you wrote to All:

 BB> Theoretically, you can get a readable signal into a receiver in LEO
 BB> with a 5W HT.  The assumption is that there are no other stations
 BB> transmitting, of course, and don't bother with the factory rubber
 BB> duck.  If you cut a 19" whip antenna (I make them, by the way, for
 BB> hams in the Austin, TX area) you will see about +3 to +4dB over the
 BB> ducky, which may put you in range on a quiet day.

Just tonight, a couple of us proved that under quiet conditions, you canget
into SO-35 on 70cm (yes, that's with an extra 9dB loss due to the higher
frequency, as well as more than 6dB due to the longer path) with a 1W HT into a
1/2 wave.  I was using 0.5W into a small beam for a near fully quieting signal.

However, under more typical (i.e. busy) conditions, such small stations will
get trampled in the rush.

 BB> Practically, to cut through the pileups you'll need either a 50W+
 BB> mobile or a very directional antenna like a 3 or 5 element Yagi.  The
 BB> satellite crossband Yagis AES sells work pretty well with a dual band
 BB> HT -- I've seen AO-27 worked successfully with that combination.  The
 BB> HT and Yagi combination is preferable, since you can concentrate your
 BB> signal in the direction of the satellite and generate less local QRM,

I'd agree with those requirements.  From my experience on the SO-35 parrot, the
5W/Yagi combination works well, and copes with a fair degree of QRM before
getting squashed.


Tony, VK3JED

.. Jury:  A group chosen to decide who has the best lawyer.
--
|Fidonet:  Tony Langdon 3:633/284.18
|Internet: tlang@freeway.apana.org.au
|
| Standard disclaimer: The views of this user are strictly his own.


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