At 7/10/2008 00:55, you wrote: >At 12:18 PM 07/09/08, you wrote: > >><<...>> Ron, Don, Mark, and others, >> >>The attachment shows how I think I should connect things to measure >>desense. I would use the Bird with sampling coupler in place of the iso >>tee shown. Does this appear to be a correct way to measure desense? >> >>Also, I can replace the feed line and antenna with a dummy load as Ron >>has explained. >> >>John AF4PD > >< http://www.repeater-builder.com/tech-info/effectivesens.html> > >Mike WA6ILQ
Somehow I thought Jeff D. originally wrote this; I stand corrected. I use a 20 dB directional coupler instead of the iso-T, & place it in front of the RX instead of in the antenna line. Any reason why this method would be less effective? The coupler's going to have a bit of loss compared to the iso--T, but should be under a dB. Regarding the "note" at the end of the article: TV 2, 4 & 5 will go dark at the analog/DTV cutover in Feb. 2009. Ironically, 6 meters may become less noisy on Mt. Wilson than UHF. :( Bob NO6B
