Hello Eric, The fifth can is a bandpass/bandreject.
Rich K8JX _____ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Thursday, January 21, 2010 9:09 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: current state of our lightning struck repeater. Rich, Was that fifth can a bandpass cavity or a bandpass/bandreject cavity? I ask because a bandpass cavity imposes a DC ground on the transmission line, while a bandpass/bandreject cavity shows a DC open. If the antenna and/or feedline is experiencing triboelectric charging (i. e., "motion static"), the bandpass cavity will effectively impose a DC ground and drain the static charge. A BpBr cavity won't help the static problem, but it will clean up some spurious emissions from your PA. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com [mailto:Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com] On Behalf Of Richard MI Ranta Sent: Wednesday, January 20, 2010 9:41 PM To: Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com Subject: RE: [Repeater-Builder] Re: current state of our lightning struck repeater. I thought I'd better update the list on what was found. First off, the entire repeater was taken in to the shop for exhaustive testing. The can's were taken apart, inspected and cleaned. All that was visibly found was a little carbon. The two service monitors showed they were working ok. But, when placed back into service at the site, the transmit side leaked into the receiver side. It presented a crackling noise, like saran wrap being crushed. I don't know if the technicians tested the repeater at full power, ( 110 watts) during testing, but I think so. We did solve part of the problem. A fifth can was put into line, on the transmit side and by golly, it did the trick. The repeater is sounding better than before the strike. Interesting enough, there are two or three UHF repeaters also in the site, and none were affected????? We're now looking for a 6 can set and controller. I'll share with you when we finally find out where the problem is. Rich K8JX www.w8usa.org
