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

[Jim Jerzycke]

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: 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
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. 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 AMSAT-BB at amsat.org. 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
>
>