[CQ-Contest] 10/15 interaction

Dave Hachadorian k6ll.dave at gmail.com
Thu Nov 6 15:05:48 EST 2014

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


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 
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 
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 
KLM feed baluns of that era.

73 Randy K0EU

CQ-Contest mailing list
CQ-Contest at contesting.com

More information about the CQ-Contest mailing list