[amsat-bb] Re: AO-51 V/S

Luc Leblanc lucleblanc6 at videotron.ca
Tue Apr 20 06:14:17 PDT 2010

On 20 Apr 2010 at 2:24, Bob- W7LRD wrote:

Date sent:      	Tue, 20 Apr 2010 02:24:55 +0000 (UTC)
From:           	Bob- W7LRD <w7lrd at comcast.net>
Subject:        	[amsat-bb]  AO-51 V/S
To:             	amsat-bb at 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


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