[Lowfer] Twisted Pair as Feedline

[Peter Cranwell]

I use CAT5 cable to feed my balanced receiving loop.  I use one pair to
supply DC power to the preamp and one pair to return the RF signal.  Both
ends of the RF circuit is balanced.   I run about 100 feet.

Pete

-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net]
On Behalf Of Jim
Sent: Sunday, September 27, 2009 6:42 PM
To: lowfer at mailman.qth.net
Subject: [Lowfer] Twisted Pair as Feedline

I've got a thousand feet of Cat 5 cable that's been setting around for three

or four years now.  I was curious if anyone had looked at using twisted pair

(such as Cat 3 and Cat 5 cable) as feedline at LFs.

I'm looking at a Part 15 beacon, so what I'd be doing is feeding a 170 kHz 
square wave and DC power to the remote final amp. I think Cat 5 is rated 
something like 100 ohms characteristic impedance and up to around a half amp

of continuous current.

If I go with coax, I'm probably going to go for an antenna location that's 
about 100 ft. from the sack (where the oscillator, keyer, and power supply 
are). I do have a better antenna location that's about 500 ft. from the
shack 
that I might try with a twisted pair feed.

Just curious if anyone has played around with this before...

73 de
Jim W4JBM

http://www.hamuniverse.com/w4jbm/

"With a soldering iron in one hand, a schematic in the other, and a puzzled 
look on his face..."
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