Hi Joe and Scott, Thanks for your replies.
Yes, I did the test as described in the article and like you Joe, I did one more step which was to key the transmitter and check for desense. The SINAD reading on the meter didn't change when I keyed up. Its a "proper" commercial antenna the repeater group purchased and its only been up since early November so I'm hoping its not my own antenna :-) I do like the idea of taking an AM receiver to site and having a listen around. I hadn't thought of that and will do this as soon as I can. I wonder if oiling the dodgy connection causing this rusty bolt effect would temporarily stop it, meaning I could identify the culprit? Best wishes all and thanks for the replies. Matt G4RKY ----- Original Message ----- From: "Joe" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, January 03, 2005 8:34 AM Subject: Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions It's not desense that he has, it is loss of sensitivity. If he did the sensitivity test as stated on the article Chris wrote, the transmitter is not active. http://www.repeater-builder.com/tech-info/effectivesens.html I take the test one step more and transmit during the sensitivity test to look for desense. 73, Joe, k1ike At 08:17 PM 1/2/2005, you wrote: >Desense in the neighborhood of 17 db. is a definite >possibility. The source of the desense can be inadequate attenuation of the >transmitter and receiver frequencies by the appropriate sections of your >duplexer or, and in fact, wideband noise produced within your antenna or >other 'hardware" in it's vicinity due to poor connections and or corrosion >when excited by your transmitter. All outgoing email scanned with Norton AntiVirus2004. Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
