[Elecraft] SSB IMD

[Bill W4ZV]

Jan Erik Holm wrote:
> 
> Bill and others, hold on and think about these
> figures. -35 to -38 dB IM3 !! We are dealing
> with 2SC2782 transistors operating at around
> 12V DC. I say no more, the knowledge and intelligent
> individual will understand.
> 

Which reminds me...I set my power supply to deliver 14.5V at the input to my
K3 terminals under load.  Although the power supply specification says...

"Supply Voltage/current: 13.8 V nominal during TX. (11 V min, 15 V max).
17-22 Amps typical in TX (100W). 0.9A minimum RX."

...I would never intentionally run mine at the lower end of that range.  If
you have any concerns about overshoot when turning on your power supply,
always turn the PS on a few seconds before the K3.  I tend to leave my PS on
continuously so overshoot is never an issue.

IMD performance should be much better at the upper end of the voltage spec
than at the low end...and I believe I've seen Eric or Wayne recommend this
previously but have not searched for the exact quote.

I'll let you tell W8JI he's not knowledgeable and intelligent.  ;-)

73,  Bill

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