I didnt say at the same feedpoint; each CAT5 pair is a seperate feed and
then you seperate the actual antenna ends and ground rods the 30-40' as
suggested.
Thats what I do here and there is a minimum of 30' between each antenna and
the relay box.
Carl
KM1H
- Original Message -
On 5/7/2012 6:12 PM, GeorgeWallner wrote:
The
twisted pairs had #31 common mode chockes every 4 foot.
While the twisted pairs worked, despite the balanced
arrangement, there was more common mode (BC and noise)
pick-up than the same runs using (non-balanced, but
grounded) RG-179 cables. The
I did some careful measurements of CAT5 cable a few years ago
using a 4 port network analyzer (NOT a 2 port VNA with baluns).
On my random sample, the characteristic impedance was within
5% of 100 ohms. The cable is fairly lossy, which is no
surprise given the tiny wires. There doesn't seem to
That's why it's rated at 100 meters max distance when used for networking.
Now before everybody breaks their fingers posting anecdotal evidence to
the contrary I have done the same.
It worked out great, till we starting loading that segment down. That
400' run was replaced with fiber inside a
Loss can be mitigated by a preamp at the antenna end.
One application would to be to feed multiple Beverages at a hub without a
relay box with its isolation problems and intermittents.
Carl
KM1H
- Original Message -
From: Rick Karlquist rich...@karlquist.com
To: Bill Wichers
Shielded CAT5/6 is readily available.
Carl
KM1H
- Original Message -
From: GeorgeWallner aa...@atlanticbb.net
To: topband topband@contesting.com
Sent: Monday, May 07, 2012 9:12 PM
Subject: Re: Topband: Using CAT5 in place of coax (was video baluns)
On Mon, 7 May 2012 19:17:58 -0500
GeorgeWallner wrote:
I did that. I was testing a small dual-feed DHDL loop (-50
dBi gain) using twisted pairs removed from a CAT 5 cable.
On the bench the twisted pair showed 100 ohm of impedance
and a loss of about 2.8 dB at 1.8 MHz on a 100' run. (I
also tried CAT 6. The results were the
