[amsat-bb] Re: pre amp help..
kq6ea at verizon.net
Wed Feb 16 22:22:49 PST 2011
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.
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: 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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