I think DEMI made those "protectors". I never modified my K5GNA downconverter, so my FT-847 was tuned to 123MHz to use it, and it wouldn't transmit there. Jim
On 02/17/2011 05:56 AM, Greg D. wrote: > 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: [email protected] >> To: [email protected] >> 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 >> _______________________________________________ >> Sent via [email protected]. Opinions expressed are those of the author. >> Not an AMSAT-NA member? Join now to support the amateur satellite program! >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >> > > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
