Re: [Elecraft] Unstable KPA3-100W

Hi Tom, Have a look at the following technical bulleting from Elecraft: http://www.elecraft.com/K3/mods/K3%20Technical%20Alert%201.pdf Does your KPA3 have capacitor C3 installed? If so, that may be your problem. 73 de James K2QI On Mon, Nov 15, 2010 at 9:50 PM, K5RC wrote: > I got a number o

[Elecraft] Unstable KPA3-100W

I got a number of reports from SS CW of spurious signals. I have isolated it to one K3 (S/N 4498). With the KPA3-100 disabled (below 12 watts) the signal is clean. From about 13 watts to 90 watts, there are spurious signals about every 1KHz + and - the carrier frequency. The frequency of the spurs