[CQ-Contest] 10/15 interaction

[Dave Hachadorian]

What is the length of the stub on your 15 meter feedline, and is 
it shorted or open?

The only single stub that I can think of that will pass 15 and 
reject 10 is a 23' shorted stub.

Dave Hachadorian, K6LL
Yuma, AZ


-----Original Message----- 
From: Randall K Martin
Sent: Thursday, November 6, 2014 11:33 AM
To: cq-contest at contesting.com
Subject: [CQ-Contest] 10/15 interaction

Wow,

Thanks for all the quick responses. Here is a summary of what 
I've heard
so far.

1) I am already using coax stubs on both the 10M and 15M 
feedlines, and
I believe these are working. I do not have a 15M reject stub on 
the 10M
feed, so this is a good suggestion and I will try it.

2) Kelly VE4XT had a good suggestion to add a choke balun on the 
10M
yagi in addition to the standard KLM balun that is already in 
place to
see if this will help. The 10M feedline runs down through the 
plane of
the 15M yagi. WX is nice here and I can easily try this.

3) There may be less interaction when the yagis are 90 degrees 
from each
other, but in almost all situations, I am pointing them in the 
same
direction. Also, my goal is to eliminate the HI RFI problem from
happening in any scenario.

4) Getting rid of the K-3's is not something I would consider.

5) The antennas are both 6 element KLM big stickers, both with 
standard
KLM feed baluns of that era.

73 Randy K0EU

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