Why don't you raise the antenna, and get the repeater out of the RF field?
To: Repeater-Builder@yahoogroups.com From: tahr...@swtexas.net Date: Wed, 2 Sep 2009 21:32:35 +0000 Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi Scott, The 100' of separation is from the repeater to where the antenna is located. I have a Telewave 6 cavity BpBr duplexer on the system. Single feed to one antenna. Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, "Scott Overstreet" <sc...@...> wrote: > > Tim--- > > I forgot that you spoke of 100' antenna separation. This suggests no > duplexer and two feedlines. The meat of my story is still good---a corroded > transmit antenna is capable of making and radiating allot of receive > frequency noise ---even with between antenna pattern attenuation, there > might well be enough to desense your receiver. > > Scott > > ----- Original Message ----- > From: Scott Overstreet > To: Repeater-Builder@yahoogroups.com > Sent: Wednesday, September 02, 2009 1:24 PM > Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense? > > > > Tim > > Been there and done that! > > My guess is that you have corrosion in the antenna on top. The corrosion > makes a good wide band rectifier of your transmit power and produces > sufficient noise at your receive frequency to get back through your duplexer > and into your receiver as desense. Actually, come to think about it, the end > result of the situation is simular to bad LMR-400. > > Scott, N6NXI > ----- Original Message ----- > From: tahrens301 > To: Repeater-Builder@yahoogroups.com > Sent: Wednesday, September 02, 2009 9:56 AM > Subject: [Repeater-Builder] Re: Antenna SWR = Desense? > > > > Hi All, > > And the winner is..... Door # 2. > > Put the 2 meter vertical up on the stick at the end of > the hard line, & the desense was worse! > > Perfect match at the feed line end. > > Took dummy load & put on far end of hard line & no desense. > > Guess it is the proximity to the antenna. Although about 100', > guess the RF is getting back into the box. > > Gonna set the antenna party for Friday morning. The stuff > is going up on the tower (unless somebody can see some flaw > in my logic & can suggest <another> test)! > > Thanks again to all! > > Tim W5FN > > > > > > ---------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.409 / Virus Database: 270.13.75/2340 - Release Date: > 09/01/09 20:03:00 > > > > > > ---------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.409 / Virus Database: 270.13.76/2342 - Release Date: 09/02/09 > 18:03:00 >
