[CQ-Contest] 10/15 interaction - No More

Steve London n2icarrl at gmail.com
Fri Nov 7 18:48:00 EST 2014

Glad you got it fixed, but, you didn't have 20 watts coming into the K3. 
It would have been smoking. That would also indicate your Dunestar only 
has about 19 dB of rejection. Far less than what K9YC measured.

Steve, N2IC

On 11/07/2014 02:08 PM, Randall K Martin wrote:
> I want to thank all of you for your great insight on my problem with the
> 10M monobander transmit power getting into the 15M monobander line. It
> turns out that adding a simple reject stub for 10 and 20 meters (shorted
> 1/4 wavelength at 7 Mhz, approx 23 feet long) took care of the problem.
> I am embarrassed to admit that, prior to fixing the problem, I took
> someones suggestion and measured the RF power coming in on the 15M coax
> at the amp input when transmitting on 10M at 1500W. I found almost 20
> watts! I should have checked to see what power was making it past the
> dunestar 600 at the rig output, but it is a moot point now. In any case
> it is no wonder the K-3 was complaining.
> Inserting the stub dropped the power to where there is no perceptible
> reading at the 20W scale on the elecraft meter.
> Thanks especially to OH6LI, W2VJN, and K6LL for steering me towards the
> 10/20 reject stub.
> 73 Randy K0EU
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