KX-1, Picnic Table Portable and TVI

[bprats]

Is anyone experiencing TVI.  Recently I went camping in an
RV park where most of the TV reception was via the Winguard
amplified TV antenna, not Satellite.  This is a broadband
receiver amp for TVs and is built into the antenna.

When operating 40 and 30 meters CW from a nearby picnic
table into a Buddipole with close to 1:1 SWR I could see my
own TV inside the motor home 15 feet away lightly flashing
as I keyed.

The problem was somewhat less with internal batteries
indicating 1.5 watts but the dim flash was still there.

Park folks not happy, me not happy, what is your
experience??  Bill K6ACJ


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[Ron D'Eau Claire-2]

Broadband TV amplifiers are darn near impossible to deal with. Your rig may
be clean as a whistle, but when the RF from your signal down in the HF range
hits that amplifier it overloads the first stage producing garbage across
the spectrum, including all the TV channels up through UHF. Even TV's not
connected to it may get TVI from the junk re-radiated by the amplifier
through the antenna.

The right solution is a high-pass filter at the broadband amplifier input to
block the HF signal from your rig, and perhaps proper shielding if it isn't
already. That's not a practical solution in cases like yours in the RV park.

The only other solution is to reduce the amount of RF it picks up. You do
that by moving your transmit antenna away from the TV antenna and/or
reducing power.

Ron AC7AC

-----Original Message-----
Is anyone experiencing TVI.  Recently I went camping in an
RV park where most of the TV reception was via the Winguard amplified TV
antenna, not Satellite.  This is a broadband receiver amp for TVs and is
built into the antenna.

When operating 40 and 30 meters CW from a nearby picnic
table into a Buddipole with close to 1:1 SWR I could see my
own TV inside the motor home 15 feet away lightly flashing
as I keyed.

The problem was somewhat less with internal batteries indicating 1.5 watts
but the dim flash was still there.

Park folks not happy, me not happy, what is your
experience??  Bill K6ACJ



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[lbailey]

Bill....About 20 yrs. ago, my family lived in a rural subdivision & all of
the neighbors had amplifiers on their TV antennas as some reception came
from about 100 miles away.

We lived on about 3/4 acre lots but I still caused TVI on my neighbor's TV
with my 100 watt HF rig.  I understand your problem but I don't know of an
easy solution since the problem can't be corrected at the rig except with
the on-off switch.  Cable TV has been a real help to minimize TVI.  I
assume that satellite TV is fairly TVI immune, too.

>>most of the TV reception was via the Winguard amplified TV antenna<<

73 de K5AVJ, Lynn
(K2 #1411)
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[Stuart Rohre]

There is a fix for this well known susceptable Wineguard amplified antenna.
Check out the ARRL web site, or Wineguard web site.   Something was in QST I
believe also.

They have to fix or trade in the antenna with Wineguard.  It is not possible
to fix at the ham station.
72,
Stuart
K5kVH


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