Was running about 150W on 18 MHz this afternoon. My KPA 500 made a loud pop. No more output. Any pointers of where to start looking?
*Details:* KPA500 (use with KAT500 and Icom 7610) Antenna on this band is a SteppIR Amp has been running FB KPA Utility 1.13.7.16 240V supply A single loud pop was heard. Mode remained in OPER No fault light displayed, nor can I find one in the Fault Table *After the failure:* *In STBY:* Radio and antennas work fine. SWR shown to exciter is low, as expected. Exciter power is displayed on KPA500 power meter. HV = 78.2 Works correctly on all bands *In OPER:* HV = 78.2 key up On key down (input of 15W) the asterisk briefly displays, then display changes to 18.1, back to HV display on key up. Zero output, SWR shown to exciter is very high (over 3 to 1) No power shown on output meter. Fails *on all bands* with high SWR to the exciter. No fault indication. *Other data:* Here's the last three entries from the fault table: 00000000 00 PWR ON -- 0007 Power was turned on 00000039 09 REFL HI 80 00F0 Excessive reflected power (high SWR) 00000000 00 PWR ON -- Power was turned on ............. Apparently only faults get logged, subsequent power cycles have not changed the table. I power cycled the amp, including removing the mains power. - no change. I reloaded the last configuration - no change. I removed the cover and looked for any visible damage or bad odors. Nothing stands out. Amp is about 4 years old and was a kit model. Before I start to disassemble if anyone can offer a likely culprit I'm all ears. Thanks, Jim/KK1W ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
