[RFI] Horizonal Sweep Noise
Jim Rhodes KC0XU
Jim Rhodes KC0XU <firstname.lastname@example.org>
Wed, 08 Jul 1998 17:49:31 -0500
Did the neighbor offer to pay for all of these items that it took to clear
up the interference caused by his defective equipment? You know he would
have expected you to pay if you were interfering with his TV!
At 08:04 AM 7/8/98 -0700, K7FD wrote:
>I had this problem plaguing me just recently. In my case, the neighbor
>had installed a WebTV internet device on top his TV, then connected
>a phone line to it which was hung to the ceiling and strung down
>the hall to the phone jack. Nice antenna, huh?
>Needless to say, I was hearing his tv set 5x9, especially when
>I turned the quad directly to his house 70 feet from mine. I
>put core mix #77 on ALL leads coming from the tv set, i.e.,
>the phone line, power cord, audio/visual cables to the WebTV
>device and the tv cable line. I also put an AC line filter on
>his tv and put a radio shack phone interference filter on the
>This cured the problem 100% and all tv harmonic noise has been
>eliminated from this neighbor. I do have another neighbor causing
>similar interference but only occasionally...so I'm not willing to
>invest any money in that one yet!
>73 John K7FD
>> From: WX5L <email@example.com>
>> To: firstname.lastname@example.org
>> Subject: [RFI] Horizonal Sweep Noise
>> Date: Wednesday, July 08, 1998 3:37 AM
>> Has anyone had success eliminating horizonal sweep noise from a
>> screaming TV?
>> Horizonal sweep at 15.75 khz is rich in harmonics and often couples with
>> the A/C line or cable feed and actually backfeeds acting as an antenna.
>> If you hear a raspy a/c note on the HF bands especially 20 meters and
>> below every 15.7 khz apart that's whats going on.
>> I put a hefty common-mode ferrite choke mixture #43 on the offending
>> TV(neighbor) and noticed a slight decrease but not enough to amount to
>> Does anyone have any other ideas other than asking my neighbor to but
>> another TV.
>> New Orleans, Louisiana
>> Submissions: email@example.com
>> Administrative requests: rfi-REQUEST@contesting.com
>> WWW: http://www.contesting.com/rfi-faq.html
>> Questions: firstname.lastname@example.org
>Administrative requests: rfi-REQUEST@contesting.com
Jim Rhodes KC0XU
Administrative requests: rfi-REQUEST@contesting.com