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
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