Re: [Elecraft] KPA500 gain variation with serial number

Mine was bought new in the Summer of 2022 and on most bands it needs watts to be in the mid to upper 30s to get the 500 out. On 7/20/23 13:04, Andy Durbin wrote: I have been told that the gain of the KPA500 has increased over the years it has been produced. "Early" KPA500 are reported to

Re: [Elecraft] KPA500 gain variation with serial number

Andy, Pitch out the highest, and lowest, and it looks fairly flat... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources On 7/26/23 11:00, Andy Durbin wrote: I now have data for nine

Re: [Elecraft] KPA500 gain variation with serial number

I now have data for nine KPA500 with serial numbers ranging from 11x to 478x (exact serial number intentionally obscured). Thanks to everyone who contributed. The data show no significant increase in gain from the earliest to the latest serial numbers. However, the data do seem to suggest

Re: [Elecraft] KPA500 gain variation with serial number

Thanks to all those who have submitted test data. I shall need more to have any hope of seeing a correlation so please keep it coming. Requested data: Serial number; frequency; drive power; output power (target 500 W); PA voltage (front panel HV); PA current (front panel CUR); power

[Elecraft] KPA500 gain variation with serial number

I have been told that the gain of the KPA500 has increased over the years it has been produced. "Early" KPA500 are reported to need 35-39 W to produce 500 W out. "Later" KPA500 are reported to need only 20-25 W for full output. The difference in gain has been attributed to difference in the