Re: [amsat-bb] 2.4 ghz converters

[K5OE@xxxxxxx]

Jess,
I also do not have any "real" test gear here, but have done some fairly careful side-by-side tests on various downconverters using both amateur ATV signals and MMDS signals here locally.  I have done comparison testing with various antennas and the results below are consistant regardless of antenna.  We have an S-band ATV repeater, W5PZP, here in Houston that provides a very constant on-air signal source, plus a half-dozen MMDS channels to pick from (my favorite is Discovery Channel).  Here are my observations referenced to W5PZP with a 16-turn helix antenna:

stock Drake 2880 with no mods:       P2
California Amplifier with no modes:  P3
Drake 2880 with all "easy" mods:     P4
Above + Conifer preamp               P5
TranSystem AiDC with no mods         P5
TranSystem AiDC with 8.125 crystal   P5

73,
Jerry, K5OE

In a message dated Tue, 10 Apr 2001  2:22:55 PM Eastern Daylight Time, Jesse Morris <w4mvb@juno.com> writes:

<< Good Afternoon to All,

I had a Trans System 3373 with the 2.4 ghz stub cut out and a Drake 2880
with all the G0MRF mods in it on the bench at the same time this
afternoon.  Since I only have a weak signal source my tests are pretty
crude compared to most of those described here but I thought they might
be of interest.

I found the 3373 to have 3 or 4 db more gain than the Drake but I could
not tell any difference in weak signal detection capability.  The weak
signal detection capability of the 3373 did not degrade until I inserted
about 15 db of attenuation in the IF line.  Although the frequency
stability of my weak signal source is not very good I did not hear
anything to suggest short term frequency "hopping" with the 3373.

I use a 122 mhz to 28 mhz converter here and listen on 10 meters with a
Yaesu FT-840.


73 de Jess - W4MVB



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