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 www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE