Re: [Elecraft] D19 shorting out in K1
Jim, D19 is intended to sacrifice itself instead of the PA transistor from events like high SWR or power supply surges. That means your antenna switching is likely producing a voltage spike when switching. Possibilities that I can think of include switching an antenna which has a bias T network associated with it, or somehow your power supply is producing a spike when you switch the antenna. There is nothing in the K1 itself which would cause it (unless the K1 is transmitting when the antenna is switched). 73, Don W3FPR On 3/12/2018 8:08 AM, Jim Ragsdale wrote: I've been wondering if anyone else has experienced this. I have a K1 with the KAT1 ATU and am using an A/B switch to swap antennas. Three times now when I swap antennas with the power on the K1, it shorts out diode D19 in the final. I can solve the problem by always powering down before the swap, but sometimes I forget to do that (has nothing do with my age. HI). __ 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
Re: [Elecraft] D19 shorting out in K1
Jim Ragsdalewrites: > I've been wondering if anyone else has experienced this. I have a K1 > with the KAT1 ATU and am using an A/B switch to swap antennas. Three > times now when I swap antennas with the power on the K1, it shorts out > diode D19 in the final. I can solve the problem by always powering > down before the swap, but sometimes I forget to do that (has nothing > do with my age. HI). > > Any thoughts? Are you really sure there is no electrostatic charge on the antenna you are switching to? Do you have a bleeder resistor, or does the switch ground the unused antenna? 73 de n1dam __ 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
[Elecraft] D19 shorting out in K1
I've been wondering if anyone else has experienced this. I have a K1 with the KAT1 ATU and am using an A/B switch to swap antennas. Three times now when I swap antennas with the power on the K1, it shorts out diode D19 in the final. I can solve the problem by always powering down before the swap, but sometimes I forget to do that (has nothing do with my age. HI). Any thoughts? 73, Jim W5LA __ 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