[NLRS] VHF low pass filters?

[S. Earl Jarosh]

A lot of times you can get a CATV guy to build one of these for you at no
charge.   I actually once got them to build me a 75' cable with the special
low loss non-labeled stuff they carry with them for long runs in commercial
bldgs.  It is about the size of RG-8u and they have special compression F
connectors for it.  I used this out at my summer place in Clear Lake where
there were a lot of big leafy oak trees.  My signal went from marginal
40-60% to 90% on the Radio Shack converter box and no preamp.  Never had
another issue with digital break up. 


S. Earl Jarosh, N0HZ
Cell:  612.868.1313
Off:   763.545.3275
Home:  763.546.7897
Fax:   763.546.7897
earl at moneycenters.com

 
-----Original Message-----
From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On
Behalf Of Matt Burt
Sent: Wednesday, January 02, 2013 10:13 AM
To: nlrs at mailman.qth.net
Cc: kp hpjr
Subject: Re: [NLRS] VHF low pass filters?



Hello Kirk,

Sry to hear about the situation there. Many good ideas so far from the list
but I can't help but chime in about the feedline and connectors on the TV
side. In all cases I recommend the entire chain of coax for the video system
including the jumpers be RG6 quad shield with compression style connectors.
The CATV guys use this stuff for a good reason. I realize that it may be
problematic to convince the neighbor to replace any of the stuff but it has
been my experience that leaky connectors can be trouble. Good luck and pse
let us know what happens.  
Home theater stuff can be good and bad. I have to remove power from my Onkyo
receiver every time I operate HF at home.

73,

Matt
KF0Q

-- Message from inservice2him at hotmail.com ---------
Date: Wed, 2 Jan 2013 09:57:27 -0600
From: kp hpjr <inservice2him at hotmail.com>
Subject: Re: [NLRS] VHF low pass filters?
To: p_hejtmanek at yahoo.com, "nlrs at mailman.qth.net"
<nlrs at mailman.qth.net>

>
>
>
> Phil,
>
> He states the nature of the interference to be a scrambling of the 
> picture or pixelating (SP?) of the image.
>
> He has said nothing of the sound aspect.
>
> I'm sure more info will be coming.
>
> The good news here is I have a wonderful relationship with this 
> person. He even helped install my Force 12 HF yagi.
>
> KK
> Date: Wed, 2 Jan 2013 07:27:03 -0800
> From: p_hejtmanek at yahoo.com
> Subject: Re: [NLRS] VHF low pass filters?
> To: inservice2him at hotmail.com; nlrs at mailman.qth.net
>
> 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.
>
>
>
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----- End message from inservice2him at hotmail.com -----


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