I'd agree with your observation Paul. It looks like something with the Sinclair. Now you've just got to try each element individually and rule more out.
Chuck WB2EDV ----- Original Message ----- From: "Paul Kelley N1BUG" <paul.kelley.n1...@gmail.com> To: <Repeater-Builder@yahoogroups.com> Sent: Tuesday, May 19, 2009 5:49 PM Subject: Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy) > There's nothing crazy about that idea Nate! I get creative thoughts > when sleep deprived too. :) > > I had been thinking the transmitter might be doing something funny. > I don't have easy access to a spectrum analyzer, but I think I've > ruled out spurs as the primary cause? Correct me if my logic is flawed. > > I did some tests before I pulled the Sinclair off the tower. With > the Sinclair and another antenna on the tower, here is what I found: > > RX & TX on Sinclair.... SEVERE noise, 10 to 40+ dB > > RX on other ant, TX on Sinclair.... moderate noise, peaks to 10+ dB > > RX on Sinclair, TX on other ant... mild noise, nil to maybe 5 dB > > RX and TX on other ant... maybe traces of noise??, barely detectable > > RX and TX on other ant, Sinclair removed from tower... no noise > detected... dead quiet > > I think this suggests something in the Sinclair is generating noise, > and that even when transmitting into another antenna it picks up > enough RF to make some noise? > > You wouldn't believe how many pages of notes I have on various tests > and experiments over the last year or so... I don't even know what's > in there any more! > > I was hoping to get up to the site today to do a brief test duplexed > into each of the other dipoles pulled from the Sinclair, but no go. > Maybe tomorrow. > > Paul N1BUG > >
