[NLRS] VHF low pass filters?

[Phil Hejtmanek]

Hi Kirk.

Very interesting problem from my perspective; I've been involved in TV transmission for 35+ years, and I think this is the first TVI complaint I've heard about now that the US has converted to digital TV.  I am curious to know what the nature of the interference is, and the actual RF channel that your neighbor experiences it on.  Has he been able to describe the nature of the interference to you?  Is it picture or sound?  More likely than not, you are either overloading a preamp in his antenna system and desensing his receiver( resulting is loss of everything), or your signal is getting in to his TV audio system somehow (if he has an external surround sound system this is fairly likely) and he's hearing artifacts of your SSB modulation in his speakers.

I doubt the problem is on your end...more likely he needs some grounding help.  If it is an overload problem, maybe you could put a tuned stub on his antenna line to suck out the 50 MHz signal.

Good luck and 73,

Phil   kf9us





>________________________________
> From: kp hpjr <inservice2him at hotmail.com>
>To: "nlrs at mailman.qth.net" <nlrs at mailman.qth.net> 
>Sent: Wednesday, January 2, 2013 7:03 AM
>Subject: [NLRS] VHF low pass filters?
> 
>
>
>
>Group,
>
>Happy New year.
>
>A neighbor approached me asking if I was operating the other night. He said that I had been interfering
>with his over the air TV signal. He placed the time frames during the MS rally and during this weekend Es opening.
>
>I have only been on 6m as of late at times running up to 600w. His home is about 1000' away from me. His setup is a new digital TV with outdoor antenna fed with the typical radio shack type coax. His antenna is basically looking my way.
>
>I'm needing some help with this. Are there filters I/he can use? 
>
>I'm well grounded and use very good hardware...Andrews connectors and feedlines etc.
>
>Your input welcome.
>
>Kirk, N0KK
>
>BTW: 1st RFI complaint in 18 years.
>
>
>                          
>______________________________________________________________
>NLRS mailing list
>Home: http://mailman.qth.net/mailman/listinfo/nlrs
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:NLRS at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>
>
>