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Re: [RFI] RFI to TV

To: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Subject: Re: [RFI] RFI to TV
From: W9RPM <john@w9rpm.com>
Reply-to: john@w9rpm.com
Date: Wed, 08 Dec 2010 16:44:59 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Thanks for all the suggestions. I will be trying solutions tomorrow 
during the day.

A couple had questions, first off it is all modes, and I have never had 
a problem in 10 years. I asked the neighbors yesterday and today, and 
none of them have had any problems, thankfully.

I have been using Mix31 on the cables. Will give an update. Thanks for 
all the suggestions. 73 John

On 12/8/2010 2:43 PM, Roger (K8RI) wrote:
> On 12/8/2010 11:27 AM, W9RPM wrote:
>> Hi, just recently I started giving my TV interference while on the 20M
>> band. When I transmit running 500 or more watts, the screen will black
>> out until I am done. I have cable TV, and the TV is a 32" about 5 years
>> old. Not LCD or Plasma. I do have Ferrite's on the power cord and TV
>> cable. I have checked all my grounds etc... I have low pass and Common
>> mode filters also on my equipment.
>> I have been looking into getting a 40" LCD also. Was wondering if they
>> are less prone also?
> Does it bother all channels, or just some specific ones? What modes are
> you running?
> You say you just recently started bothering the set so I'm assuming that
> you ran for some time without RFI.
> I doubt it's the TV set although I'd not completely rule it out.  As has
> already been suggested, I'd check the cable and connectors through the
> house.
> As this is new, it could also be a loose connection in your antennas,
> coax, connectors, or rig developing harmonics. I'd bet that there is a
> bad connection somewhere.
> Do you have a close neighbor that has recently put up a TV antenna?  One
> that has just changed over to cable?  Often people wire their outside
> antennas direct to the TV in addition to the cable without an A/B
> switch.  Antennas with preamps can rectify the RF creating broad band
> RFI and make great mixers. If hooked to the cable they can easily INPUT
> the signal to pass it on. However were that the case I think you'd see
> the cable company around your neighborhood.
> Lots of choices. Still the most likely is the poor connection
> Good Luck,
> Roger (K8RI)
>> 73 John W9RPM
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