At 1/16/2010 15:12, you wrote: >I know its been a long time since I first posed the question on what might >be causing the noise we were experiencing after being hit by lightening. >After many trips to the Technical shop for testing, we replaced the >repeater ( was a vertex 5000, now a Icom ur2000) and are in process of >checking out controllers. The duplexers were my big worry. And yes, it >would seem that concern wasn't unfounded. We started experiencing a >degradation on the receive side of the repeater and then, a leakage from >the cans. We had the duplexers checked out with two different service >monitors and found nothing! The technician who works on duplexers took >ours apart and found only a little bit of carbon, but that was it. they >checked out ok. We put them back into service and the noise was there >making communications impossible. >We are now going to replace them with a 6 configuration instead of the >four we have been using. >My question to the list is, besides the noise factor and crackling noise, >is there any other methode of discovering if the can's are bad or not? >Yes, I did and have been losing sleep over this one.
We don't get much lightning out here in SoCal (now having said that we're due for a week of very nasty weather, so maybe time to catch up?), but of the few incidents I'm aware of, the lightning damaged either the antenna or feedline in such a way that the antenna system continued to perform well w.r.t. VSWR & gain, but considerable noise was generated whenever the antenna system was driven with RF. My advise is to try a different antenna/feedline at the site & see if your desense goes away. Bob NO6B
