[Lowfer] LF Travail II

[Clive S Carver]

Has anyone considered 100 ohm Twin Axial such as IBM spec 7362211?
loss at 1 MHz = 1.5dB per 100 metres

73's
Clive
GW4EYO

-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net]
On Behalf Of jrusgrove at comcast.net
Sent: 07 December 2008 20:40
To: Discussion of the Lowfer (US, European, & UK) and MedFer bands
Subject: Re: [Lowfer] LF Travail II

I've had good success with shielded CAT-5E. A few years back I ran a
comparison between unshielded 
CAT-5, shielded CAT-5E, Canare StarQuad and RG-400 coax. Shielded CAT-5E and
StarQuad won in terms 
of electrical noise mitigation and lightning static pickup. Since the
shielded CAT-5E is cheaper I 
went that route. Balancing transformers are used and a well defined 50 ohm
input impedance 
preamplifier in the shack properly terminates the system.

Some info on the general setup can be found at
http://www.w1vd.com/k9ay11.pdf

Jay

----- Original Message ----- 
From: "Peter Barick" <pbarick at niu.edu>
To: <lowfer at mailman.qth.net>
Sent: Sunday, December 07, 2008 2:42 PM
Subject: Re: [Lowfer] LF Travail II


J.B.,
Good Guess! But no. I was dissuaded by John A. when I got the CAT-5 thought
too. Have a collection 
of it from variuos cast-offs. But John (or was it Jay?) warned of the stray
couplings in such cable. 
Made sense. So digging further I came upon intercom twisted pair, two no.
18. Had both shielded and 
non-. Used the plain stuff. Knew then it would have to be treated as a
proper trasn. line, ie, no 
lieing on the ground, so I ran out a poly line that just barely clips my
head when underneath.

Fine on your cable co. One of mine has been feeding a dumpster with used
75-Ohm cable -- N/C.
-----------------------
>>> "J. B. Weazle McCreath" <weazle at hurontel.on.ca> 12/07/08 10:05 AM >>>
Hello Peter, Lowfers,

>Hopefully this is my last bark under this rubric.  But another screw-up
came
>to light yesterday.  Lesson learned hard way: "A short-terminated twisted
>pair feedline is still a feedline, no way an antenna."

Would this twisted pair have been some Cat5 ?  I tried using some on my big
untuned delta loop,  (just 1 of the 4 pairs) but I found that I had better
signal
strength with the RG-6U CATV cable that was already in place.

I buy my RG-6U from the local cable company, who tend to regard lengths
of less than 200 feet as "waste".  At $0.20/ft. for 100% shielded and self-
healing if nicked, it's a feedline that's cheap and effective.

73, J.B., VE3EAR - VE3WZL
Solar and wind powered
Lowfer " EAR"  188.830
EN93dr

http://www.hurontel.on.ca/~weazle


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