[Elecraft] KPA100 spurs on some bands....

[G. Thisell]

Have assembled the KPA100 and it works "as advertised".
Thanks a lot for the great fun to build it - sadly its all over..

Dreamed up this morning a "K zero point five" - a small sister to the K1.

A true miniature trx cw 5W monobander, with a small battery compartment -
Sierra style but with the latest knowledge.
It should have an integrated paddle of course.
I want to build more stuff!!!

Now to the KPA100;

Hooked it up to some pro equipment and confirmed 100W on each band.

However at 3,5Mhz spurs were evident - at +/- 70Khz they were only abt -40db
Same thing (but not so many) on 14MHz - at +/- 600Khz -40db
Some spurs around 21 MHz - at 1,4Mhz (-60db)
And around 18MHz - at 3.3MHz -50db
Very clean around 7MHz

In all ok - exept the 80M spurs. As a friend told me "40 db down from 100W
is 100mW, you could work WAC on that... hi hi)
Assumption anyway is that the problem is with the power supply - it usually
is. Decoupling with all kinds of capacitors..

Will have to check.

73

Joe
SM5BFK