Hi Folks, Guess it's a good thing the antenna party didn't happen yet.
Put the DB-224 up on a pole here attached to a portable building. Ran the 7/8" heliax from the antenna into my garage - about 100'. With a signal source from my monitor, the repeater would chop in and out. Ugh-desense. I am using an old DBproducts 8 cavity notch-type duplexer. 4 on the receive, & 4 on the transmit. The transmit side also has stubs. (see old thread). First, I used my spectrum analyzer & sweep gen, and got what I thought were pretty good notches in the right places (depending if I was working on the xmit or rx side. According to the analyzer, the notch was about 70dB below the high point. However, I think that it was seeing the floor of the analyzer, not the real notch. Then, I hooked up a signal generator on one side, and a receiver on the other side, and tweaked a bit more for the least signal. All looked pretty good with definite notches, but it's obvious there's desense. All cables are double shielded. The system is 147.10/70, running about 60 watts out of the Quantar. Even running with battery-backup (20 watts), there's still some desense. Could it be that these cans are just not enough, or am I doing something wrong. Thanks! Tim
