John, Yup, thunderstorms can put some big surges on unterminated hunks of coax.
If it receives any signals at all and you can tune the signals, then it is unlikely that everything between the mixer and the audio output has been damaged. That leaves only the preamp for active stages - turn the preamp on and off to see if it works, you should see about a 14 dB change (2+ S-units). If the preamp check works out fine, that leaves only the bandpass filters, lowpass filters and the T/R switch in the base K2 and the KPA100. Since you said it transmits fine, the filters are likely not the problem (a filter problem would have more impact on transmit) - the most likely thing is one of the diodes in the T/R switch is damaged. I would first do the DC voltage measurements on the T/R switch diodes in both the base K2 and the KPA100. 73, Don W3FPR > -----Original Message----- > > I've got a K2 / 100 that has had a dramatic loss of sensitivity. This > occurred after a thunderstorm, when the antennas were > disconnected outside > the house, but there was still some residual coax feeds (unterminated) > still connected to the K2. > > Where to start to look? Appears to have lost sensitivity on all > bands, all > modes. Transmit is still fine (at least CW) . > > Thanks > John > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.20/588 - Release Date: 12/15/2006 10:02 AM _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
