? on twin-lead...

[Dave]

I have an *old* VHF/UHF passive TV antenna with a 12-position switch that
used to help with TV reception. Problem is, it is so old that the
insulation on some of the twin-lead has become brittle and broken away,
leaving the wires exposed, one of which broke. Just for a lark, I am
wanting to repair it.

It has two pieces of twin-lead feeding from the antenna body to the TV
input, one coming out of a "port" labeled VHF and the other coming from
another "port" labeled FM/UHF (I think I have these correctly grouped.) The
VHF twin-lead is gold in color, and the FM/UHF twin-lead is black. Are
these likely to be of differing impedance? I have only heard of 300-ohm
twin-lead, which I have some of, but am wondering if (just for the sake of
efficiency) I need a different impedance for either of these two circuits.
Please forgive the ignorance, I am just wondering if there is any difference
between these two, or are they color coded to assist in their internal
connections?

TIA,

Dave

 

[Dave]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:WLCdnSj9NbKTAlzVnZ2dnUVZ_oPinZ2d@earthlink.com...

Dave wrote:

I have an *old* VHF/UHF passive TV antenna with a 12-position switch that
used to help with TV reception. Problem is, it is so old that the
insulation on some of the twin-lead has become brittle and broken away,
leaving the wires exposed, one of which broke. Just for a lark, I am
wanting to repair it.

It has two pieces of twin-lead feeding from the antenna body to the TV
input, one coming out of a "port" labeled VHF and the other coming from
another "port" labeled FM/UHF (I think I have these correctly grouped.)
The
VHF twin-lead is gold in color, and the FM/UHF twin-lead is black. Are
these likely to be of differing impedance? I have only heard of 300-ohm
twin-lead, which I have some of, but am wondering if (just for the sake
of
efficiency) I need a different impedance for either of these two
circuits.
Please forgive the ignorance, I am just wondering if there is any
difference
between these two, or are they color coded to assist in their internal
connections?


They should be VHF/FM and UHF. The only difference in the wire is the
color, and they are both 300 ohms.

<snip>

Okay. Thanks. I really wasn't sure. Much appreciated...

Best

Dave

 

[Michael A. Terrell]

Dave wrote:

I have an *old* VHF/UHF passive TV antenna with a 12-position switch that
used to help with TV reception. Problem is, it is so old that the
insulation on some of the twin-lead has become brittle and broken away,
leaving the wires exposed, one of which broke. Just for a lark, I am
wanting to repair it.

It has two pieces of twin-lead feeding from the antenna body to the TV
input, one coming out of a "port" labeled VHF and the other coming from
another "port" labeled FM/UHF (I think I have these correctly grouped.) The
VHF twin-lead is gold in color, and the FM/UHF twin-lead is black. Are
these likely to be of differing impedance? I have only heard of 300-ohm
twin-lead, which I have some of, but am wondering if (just for the sake of
efficiency) I need a different impedance for either of these two circuits.
Please forgive the ignorance, I am just wondering if there is any difference
between these two, or are they color coded to assist in their internal
connections?

They should be VHF/FM and UHF. The only difference in the wire is the
color, and they are both 300 ohms.


--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.