[amsat-bb] Re: AIDC 3731 problem?

Luc Leblanc lucleblanc6 at videotron.ca
Tue Sep 9 20:53:48 PDT 2008

On 9 Sep 2008 at 18:33, Doug Kuitula wrote:

> 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 KA8QCU
> _______________________________________________

I can used the 12v from the FT-847 without any noticeable change. I was told that 24v was used on mmds system to compensate for very long 
coaxial cable run and i think there is some kind of voltage limiter in the downconverter.

I used about 100 feet of RG-59 and i have about S1 to S3 of noise but when signal are at TCA signal peak at 40DB over S9. If you cannot get 
an attenuator used a coax coil this will reduced your noise signal level.


Luc Leblanc VE2DWE
Skype VE2DWE


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