Re: SETI public: DEM SETI-LNA

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Hi Jesse,
 
Although there are many others on this list that know much more than I, I'll take a stab at it. I experienced the same thing when I first started up, and it was explained to me (sorry, I don't remember who) that if you still have the unpowered LNA in the signal path it will actually cause attenuation of the incoming signal. The best way to test it is to turn off the power and take the LNA out of line completely. Attach the coax that used to go to the LNA directly to the feedhorn and then check the signal drop.
 
I also supply 12 VDC but through a separate power cable to the LNA. I also have a switch inline so that I can turn it on/off from in the shack.
 
As I said, there are others more knowledgeable than I on this list. I'm sure one or more of them will give their perspective shortly.
 
One other thing that I can say to you and anyone else that cares to listen. If you have a station up and running, or one that is in progress, I suggest you register as a Project Argus participant. All it takes is becoming a member of the SETILeague. This has many benefits including (but not limited to) having access to the Argus technical email list, which is where I get most of my questions answered. Your membership dues also helps keep the SETILeague in existence and it's website and email lists online.
 
That's my opinion, for all it's worth. Thanks for listening. If you have any other questions, please ask.
 
Thanks,
Dave Ocame

Jesse Young <jryoung_at_optusnet.com.au> wrote:
I'm just curious to know what voltages most people are using with the
Down East Microwave SETI-LNA and what effect (if any) this has on
performance. The specs say 8-16VDC, im feeding +12V along the centre
conductor, but when I disconnect the bias-tee, there seems only a minute
drop in the signal level.

Thanks,

--
Jesse Young
*********************************** 
*********************************** 
Dave Ocame, N1YVV  
East Shore Park Observatory 
FN31ng 
-72.53856 longitude 
41.16797 latitude 

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