[RFI] Digital TV Problems

[Bob Turner]

That tends to support what I'm thinking.  That one TV is
susceptible/defective.  Perhaps swap two TVs and see if problem stays in
same place or follows the TV.

Bob

-----Original Message-----
From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
Behalf Of DGB
Sent: Thursday, April 03, 2008 5:29 AM
To: Bob Turner
Cc: dgsvetan at rockwellcollins.com; rfi at contesting.com
Subject: Re: [RFI] Digital TV Problems

No the TVs are all different makes and brands. The one bothered is a 40" 
HD Samsung.

thanks 73 Dwight NS9I

Bob Turner wrote:
> I believe he said TV service just went digital.  On same or different
freq?
> Perhaps the TV is more susceptible on new freq it receives on.
>
> Are all 4 TVs the same make and model?  Let us know.
>
> Bob 
>
> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
> Behalf Of dgsvetan at rockwellcollins.com
> Sent: Wednesday, April 02, 2008 3:44 PM
> To: DGB
> Cc: rfi at contesting.com
> Subject: Re: [RFI] Digital TV Problems
>
> Dwight,
>
> An interesting problem, especially since I heard recently that some 
> community CATV systems are planning to run digital video on CAT-5 lines 
> around town.  That's a truly scary thought.  I have heard of one system in

> another town that is working, but they did use SHIELDED CAT-5E cable 
> (verified by visual inspection by hams).  In your case, a few questions 
> come to mind:
>
> 1.  What is the orientation of this one problem set  relative to your 
> antennas?
>
> 2.  What is the connecting device between the TV and the phone lines?  Is 
> it a passive balun or an active device "converter" box?
>
> I saw K9YC's reply to your inquiry.  Read and heed the info from his web 
> site.  The grounds you have are very nice and good for system protection 
> from lightning damage, but this is strictly an RF overload problem 
> somewhere.  If the TV was good on an outside antenna before, it is 
> probably not the set that is the problem now.  You should concentrate your

> efforts on the interface between the TV and phone lines, and don't forget 
> that if you use ferrites, be sure they are appropriate for the frequency 
> bands you are using. 
>
> Please keep us informed on your progress, and best luck.
>
> 73, Dale
> WA9ENA
>
>  
>
>
>
> DGB <blueheron at Bayland.net> 
> Sent by: rfi-bounces at contesting.com
> 03/31/2008 07:18 PM
>
> To
> rfi at contesting.com
> cc
>
> Subject
> [RFI] Digital TV Problems
>
>
>
>
>
>
> I've recently had  subscribed to a service thru the fone lines that 
> include TV and Internet. I've had the internet thru it for a long time.
>
> I have 4 tv's in the house hooked to this system.
>
> My shack is in a separate building but still about 30' from that problem 
> tv. I've a good single point grounding system that is all connected to 
> the tower, the service here in the shack, and the house's service. It's 
> all connected undergnd with 2" copper and gnd rods every 16' (over 30 
> rods).
>
> Recently I've been getting into the TV when xmtg but just one of the 
> tv's. My signal scrambles the digital image, like tiling.
>
>  I never had that problem when the tv had an outside antenna, even when 
> running legal limit. I've put several clamps-ons on the problem tv. I 
> also have a cat5 and telephone cable coming out here to the shak 
> underground and have clamp-ons on them as well.
>
> Where do I start?
>
> Thanks ... 73 Dwight NS9I
>
>
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