[amsat-bb] Re: AIDC 3731 problem?

Jim Jerzycke kq6ea at pacbell.net
Tue Sep 9 16:34:06 PDT 2008

It's normal. Most of these MMDS downconverters have WAY too much gain. I had better results adding a 6~12dB Radio Shack attenuator to mine. I added it to the "radio" side of the DC injector ("bias tee") so it wouldn't dissipate any of the DC power being fed up the coax.
73, Jim  KQ6EA

--- On Tue, 9/9/08, Doug Kuitula <ka8qcu at pasty.net> wrote:

> From: Doug Kuitula <ka8qcu at pasty.net>
> Subject: [amsat-bb]  AIDC 3731 problem?
> To: amsat-bb at amsat.org
> Date: Tuesday, September 9, 2008, 3:33 PM
> Hi all,
>  I've been trying to receive the 2.4 ghz from AO-51
> using an AIDC-3731 downconverter with a grill. Any time I
> plug in the wall wart that came with the unit, I get  S-9 
> noise on my receiver. The receiver is an Alinco DR-1200. I
> know it's not the best. But it's what I got. From
> the material I got with the downconverter, it needs 24
> volts. Is that fixed in stone, or can I use something less
> for voltage?  I think I'll try a couple of 12v batteries
> in series. Has anyone else had the same problem? Any
> suggestions will be appreciated.
>  73 and hope  to make some more contacts on AO-51. de Doug
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