Hi Kevin, The same thing happened to me when a bias-t failed. The damage was limited to the SWR circuitry. If I recall, T4 was replaced and a burnt trace on the pcb was repaired.
- 73, Dave N4KD > On Mar 26, 2021, at 00:48, Kevin McGrath via Elecraft > <[email protected]> wrote: > > I accidentally hooked up a bias tee (DC power injector) backwards, which > put +12V into the K3's antenna connector. The results were not good: a > burning smell from the rear of radio. The radio was in QRP mode (<10watts, so > PA bypassed?) on 40m when it happened. > > RX appears to be fine. The radio still makes 100W out, but the SWR reads 99.9 > on all bands (into a dummy load). Also, the power control has no effect - > power out is always 100W. > > Looking at the schematic, T4 in the SWR bridge certainly would have been > fried by applying 12V to the antenna connector. > > What else did I damage? > > KevinK6TOP > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
