[amsat-bb] Re: pre amp help..

Greg D. ko6th_greg at hotmail.com
Wed Feb 16 21:56:50 PST 2011

As others, SSB Electronics model that is RF switched.  I *have* transmitted 100+ watts into it, though not on purpose, and it works just fine.  I got the RF switched model as a "just in case" bit of insurance, and am glad I did.

It's been reported here a few years ago  that sometimes there's a little "burp" of RF that squirts out when a transceiver is powered up.  Seems unlikely , but if so, maybe that did it?

If I recall, the discussion was about people frying their AO-40 S-band down converters by accidentally transmitting into them.  An somewhat less certain recollection is that someone came up with a simple circuit that would clamp the RF to a more forgiving, if not totally safe level.  As an alternative to an RF switched preamp model, perhaps a stroll through the archives might net a different solution.

Good luck,

Greg  KO6TH

> From: k7trkradio at charter.net
> To: amsat-bb at amsat.org
> Date: Wed, 16 Feb 2011 13:59:41 -0800
> Subject: [amsat-bb]  pre amp help..
> I just sent my ARR pre amp back to ARR for repair for the 3rd time !
> (pretty sure I did not tx through it )
> What are people using for pre amps. I only see the Mirage as an alternative.
> Any other choices. I'm kind of disappointed in ARR products. 
> Is there a pre amp that you can tx through preventing accidental frying?
> Any thoughts appreciated
> 73, Ted, K7TRK
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