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[TowerTalk] TVI problems

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Subject: [TowerTalk] TVI problems
From: (Steve Weisbrod)
Date: Fri, 20 Jun 97 09:12:00 -0600
I had a similar experence with K-com.  I did an A-B test with K-com and   
Optotech results with K-com RFI gone!!!! With Optotech still could hear   
my signal although reduced in the phone. For the neighbor's intercom I   
ended up using split core #43 ferite (.75" square 1.25 long with .25"   
hole) that I got from Nebraka Surplus at Dayton on each lead of the   
intercom. However I had to wind six turns through each one to be   
effective. What a pain it took a whole Sat. My neighbor had 12 phones I   
only put filters on 5 of them not cheap but he doesn't call any more.   
Maybe he just doesn't want me in his house for a whole day again but   
whatever I'm happy.

73 Steve W8GAZ
From:  Scott Bullock
Sent:  Friday, June 20, 1997 5:42 AM
To:  steve; ''
Subject:  [TowerTalk] TVI problems

Hello Fellow Towertalkians,

Here is a good expereince that I had last week with a subject that many
people are experiencing like me- TVI.

Since getting active again from this qth, I suddenly found a TVI problem
with my two neighbors on each side of me. One had bad interference on his
telephones-both fixed and cordless.  The other had bad herringbone/voice
interference in his tv set.

I had been running a Bencher low pass filter on my station, and when I   
the first TVI complaints. it was during the Mass QSO party contest   
stations). I had also been experiencing BAD TVI on one of my own sets in   
house. Tried the usual avenue of putting Radio Shack high-pass filters   
grounding the hell out of the sets, that was a total waste of time, tried
chokes on lines, still no success. The interference was getting into my   
through the cable lead, and also through the power line (all close   
to my tribander)

I called KCOM for some telephone filters for one neighbor, installed   
and voila-that problem solved. Simple plug-in installation.

I then called ICE for their common mode high-pass filters. I had seen   
referred to on the FCC home page.  While talking to them, I found out   
they make a low pass filter with a cutoff frequency around 35 mhz, by the
time you get to 50 mhz, the attenuation is >100 db. This is versus other
manufacturers that only offer approximately 80 db attenuation.  I bought   
high pass filters and a new low pass filter. These suckers REALLY work!
Simple installation, plug in and ground (I used the AC ground off the
closest outlet) Did the same for the neighbor, and NO discernable TVI on
either tv!! I also got a common mode AC interference filter for my tv set
(#15-1111) from Radio Shack and installed it on my tv set. NOTHING at all
even under full power with the amp! My wife doesn't bang on the floor or
yell and scream anymore when I work DX !

The ICE/KCOM companies really have a good product!

ICE part #'s 430b-high pass filter ($52.00), #421 low pass filter   

If you have TVI problems, RUN, don't walk to the nearest telephone and   
these people. I don't have KCOM's tel # handy, but ICE is at   
You'll be glad you did!

73, Scott

No moles, no bees, no cling free, my antennas don't shine, and I still   
know where true north is. <G>

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