[amsat-bb] AO-7 Mode A

Glen Zook gzook at yahoo.com
Sat Jun 10 19:41:43 UTC 2017

In the "goode olde dayes", when AO-7 was new (and also Oscar VI), I used to use a 2-element 10-meter beam mounted below a 7-element 2-meter Yagi elevated about 45-degrees.  Later, added a 70 cm beam with the 2-meter beam on an az-el mount with a TV rotor for the elevation.  Glen, K9STH Amsat 239 / LM 463Website: http://k9sth.net

      From: rsoifer1--- via AMSAT-BB <amsat-bb at amsat.org>
 To: amsat-bb at amsat.org 
 Sent: Saturday, June 10, 2017 2:22 PM
 Subject: [amsat-bb] AO-7 Mode A
Mode A has always been weaker than Mode B, but with a decent 10-meter antenna it is quite usable.  Many operators access Mode B with a 2-meter beam of some sort, then try to hear Mode A with a dipole or ground-mounted vertical , then complain that they cannot hear it.

There is no substitute for a good 10-meter beam.  A tri-bander usually works too, but check the tuning to see that the SWR isn't too high at 29.5 MHz.  If it is, you may have to re-tune it or even shorten the elements slightly.  If you absolutely cannot put up a beam, your second choice can be a 10-meter ground plane, elevated so it is mounted in the clear.  It has no forward gain of course, but it will give you a low radiation angle, which will help in hearing AO-7 when it is at low elevation which it is most of the time.

With Field Day coming up, a little attention now to your 10-meter antenna will show up in your results later.


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