Joe, Use a magnifying glass to closely check every solder joint for cracks. Some such cracks appear due to temperature cycling over time. I have already had the same problem, where a PA was dead at the site but worked fine on the bench. It was around 40 degrees at the site, but around 70 at the bench. Sure enough, a tiny crack had opened on a PA power lead. Reflowing solder at that connection cured the problem.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Sunday, February 22, 2009 4:56 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MASTRII 100 watt PA question Hello list dwellers, I went to our repeater site today and found the MASTRII PA dead. I could hear the exciter on my HT and the exciter output checked out OK at 250mw. There was good DC to the PA deck, but no current draw. I checked the usual suspects, the 2 buss wires that carry the DC, the RCA phone jack input, loose connections. etc. Nothing appeared to be bad. I pulled it out and put it on the bench and now it works. The major symptom was no current draw. I can't find a thing wrong at this point. Any ideas? 73, Joe, K1ike ------------------------------------ Yahoo! Groups Links
