"1. How to confirm that the cable TV system is leaking? (I don't have any
sophisticated equipment)."
It is pretty simple. If you are interfering, the cable is leaking. No real
equipment is needed. That is assuming you are not overloading the television
set innards.
Easy to check. Remove cable. If interference has gone, it is the cable
system. Since the cable is designed to be a closed system, it will neither
radiate or pickup - unless it is not assembled correctly.
Often, the connections are not tight. Sometimes this is the fault of the
homeowner, when he adds cables. Sometimes the cables are not tight outside.
There is a two way street, though. If the shield is not intact, the cable will
radiate, and you can track it down with simple direction finding equipment, or
even a receiver, tuned to one of the channels in the cable network.
Often the cable company will try to pass off the problem as yours - but even if
you transmitter was the dirtiest transmitter around, with harmonics louder than
the fundamental, it should not get into the cable system unless the cable was
not intact.
Not sure what the Canadian wireless authority will do, but the ARRL publishes a
book on how to track down the problem.
When the cable company came to town many years ago, our amateur group spoke
with the police chief. We often assisted him in events and even Halloween
patrol. He wrote a letter to the cable company and told them that their
franchise was dependent upon not interfering with amateurs, and that if the
were any unsolved problems, their franchise was revoked. We had excellent
cooperation from them and I still have spools of hardline out back that the
cable company gave to me. Those were the days.
73, Colin K7FM
-----Original Message-----
From: Bert <balmemo@sympatico.ca>
Sent: Nov 28, 2005 9:35 AM
To: 'Jim Brown' <jim@audiosystemsgroup.com>, amps@contesting.com
Subject: Re: [Amps] difference between 2,3,4 and 43, 45, ... materials?
Hi Jim,
I have read the suggested links on your website. Very interesting and
informative.
I suspect I have problems with a leaking cable TV system and would
appreciate some advice.
1. How to confirm that the cable TV system is leaking? (I don't have any
sophisticated equipment).
2. How to approach the cable TV company for best response and to take
action? Thanks.
73 Bert, VE3OBU
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Jim Brown
Sent: Sunday, November 27, 2005 2:12 PM
To: amps@contesting.com
Subject: Re: [Amps] difference between 2,3,4 and 43, 45, ... materials?
Sorry to be late in responding -- I've been on the road.
There's a tutorial on ferrites on my website. Select the two documents about
RF interference. One is directed to audio, but has the best tutorial
material. The other is the PowerPoint for a presentation I did to our local
ham club last spring.
Those numbers are Fair-Rite material numbers. Fair-Rite makes nearly all of
the ferrites sold as new parts in the ham market.
http://audiosystemsgroup.com/publish
Once you've studied my tutorials, you may want to study data sheets for the
various materials on the Fair-Rite website. They have an excellent pdf
catalog, which you can download. Google to find their website. There are
other good companies making ferrite parts, but they haven't found their way
into the ham radio world (except as unidentified surplus parts).
73,
Jim Brown K9YC
On Sat, 19 Nov 2005 11:49:55 -0800, Dan Sawyer wrote:
>The other has series numbers 43, 45, etc.
>What are these two series used for?
>What is the difference?
>Within a frequency range do they functionally similarly?
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