[TenTec] 95% Shield

[Ron Notarius W3WN]

Boy... there are a lot of unknowns and variables there.

First, be proactive.  Make sure you have a low-pass filter on your rig, your
coax is intact, and connectors are tight.

Next, if you're allowed, carefully examine the neighbor(s) TV(s) in
question.  What type of coax are they using?  How is their cable system
wired up?  Did anyone hack into a cable to add a splice?  Do they have a set
of "rabbit ears" anywhere?  (I've seen people leave their rabbit ears on, or
their whip antennas on the TV attached, thinking it would "improve"
reception; I know, but sometimes, you just can't convince 'em)  Is the TV
case plastic (probable)?  How about their converter box?

Do you have a friend with an HF mobile setup?  If so, ask them to sit in
your driveway and make some test transmissions on various HF bands.  If your
neighbors still have RFI, that's a clear indication that the problem may NOT
in your rig, but in their sets; OTOH, if there is no RFI, that's a clear
indication that the problem may NOT be in their sets, but in your rig.

It's not a question of power; it's a question of how the RF is getting into
their set.  If (unlikely) your rig is malfunctioning and putting out spurs
where it shouldn't, then your rig needs repaired.  But if (much more likely)
there's a leak or break in their cable system, which is letting RF into the
allegedly (hah!) "closed" system, the break has to be fixed.

Been there, done that.

GL.

73, ron w3wn

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Jim WA9YSD
Sent: Thursday, May 15, 2008 6:53 AM
To: tentec at contesting.com
Subject: [TenTec] 95% Shield


How much power in watts or milliwatts does it take to interfere with the TV
with an outside antenna when operating HF?   How much with cable TV?
Lets say that the outside antenna and cable TV is in an urban area.
Neighbors house is say 75 feet from the base of the ham tower.

Is that with in the leakage spec of say RG-213 on HF freq?

 Keep The Faith, Jim K9TF/WA9YSD




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