[amsat-bb] RF Sensing Preamps, Sequencer, or both?

Andrew Glasbrenner glasbrenner at mindspring.com
Tue Aug 2 11:01:54 UTC 2016

Sequencers are generally only needed for high power operations over a few hundred watts, which are inappropriate on satellite. I think you'll find most of us use RF switched preamps at the antenna, with a few using them in the shack but with very good feedline.

73, Drew KO4MA

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Fred Castello
Sent: Monday, August 01, 2016 8:05 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] RF Sensing Preamps, Sequencer, or both?

Hi folks,

I am in the process of trying to set up a station here and have been researching equipment.  While I suspect there will be a fair amount of variety, I am curious to the responses to my question:

Do you use the relatively less expensive “indoor” NON RF switching preamps in an enclosure near the antennas (on the tower)  with RF relays and with a sequencer in the shack (do the preamps holdup up on the tower even if protected?)  OR

Do you use RF sensing preamps mounted at the tower  OR

Both (for those that are extra careful)?  I suspect operators that do other VHF/UHF low signal work tend toward sequencers (one for 2 meters and one for 440), i.e. moon bounce, meteor scatter, etc.

Also, I am curious what type/brand/model of RF relays folks use?

As usual, I really appreciate your time.
Fred Castello, KF4FC

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