On 20 Apr 2010 at 2:24, Bob- W7LRD wrote: Date sent: Tue, 20 Apr 2010 02:24:55 +0000 (UTC) From: Bob- W7LRD <w7...@comcast.net> Subject: [amsat-bb] AO-51 V/S To: amsat-bb@amsat.org
> > > This last pass worked W6YX and heard Kerry, WC7V. Noticed some very deep > fades. > > 73 Bob W7LRD Did anyone ever tested their downconverter who is basically a receiver to measure the amouint of desense the WI-FI , spread spectrum and frequency hopper device and so on produce on 2.4Ghz? Desense is very noticeable on VHF and UHF when a transmitter is transmitting near a receiver as per i can see on a PCR-1000 scope screen there is always a 10db noise floor but i'm not sure if this level is not really much higher as the scope seems to not be fast enough to display the real peak level of all the signal on 2.4Ghz. If a fairly high amount of desense is always present this could explain why the downconverter is lacking sensitivity and why some normal fades appears deeper than they really are. And what is worse is the WI-FI QRM is also right on the received 2.4Ghz amateur band. Here i have to switch off my WI-FI router and my 2.4Ghz camera when i want to listen on 2.4Ghz and the camera is the worse as she give 30 over 9 very wide spread signal. Opinions are welcome. "-" Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE _______________________________________________ Sent via amsat...@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
