[Elecraft] KPA500 gain variation with serial number

[Dave (NK7Z)]

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 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 that serial numbers near 2,000  have gain well above average.
> 
> Perhaps the most interesting data came from one owner of two KPA500.  Serial 209x had a gain of 14.4 dB but serial 478x had a gain of 12.0.  These numbers are from the same person using the same power measurement device and same measurement technique.
> 
> Lowest reported gain was 11.5 dB (2 samples) and one of those is mine.  There are three others at 11.8 dB.  All except 3 fall in the range 11.5 to 12.0.
> 
> Plot can be found here - https://www.dropbox.com/s/jk1t9j2417lh9gz/KPA500%2020%20m%20gain.png?dl=0
> 
> I also have some information on two other KPA500 that have high gain but I don't have serial numbers for them.  I'll update my plot if I receive any additional data.
> 
> 73,
> Andy, k3wyc
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at 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 dave at nk7z.net