[TowerTalk] FW: [Amps] UHF Connectors

[Matt]

Great Story  :)

KM5VI

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Fuqua, Bill L
Sent: Monday, November 11, 2013 2:03 PM
To: jim at audiosystemsgroup.com; amps at contesting.com
Subject: Re: [Amps] UHF Connectors

  Lots of knowledge has been lost over the past 60 or 70 years. It is
important to take time to see where we have been before determine where we
are going. 
  I had a coworker that thought his grandfather was not so sharp some of the
times.
He was telling me about the UHF TV antenna he had on top of a steep hill,
the house was some distance way on the side of it. He thought that his
feedline instillation was rather stupid since he did not use coax but a
single insulated wire from the tower to the house. 
  I asked him if there was a cone on the ends and he said yes. So I had him
google G-Line and he then realized how sharp he was after all. 
  73
Bill wa4lav

________________________________________
From: Amps [amps-bounces at contesting.com] on behalf of Jim Brown
[jim at audiosystemsgroup.com]
Sent: Monday, November 11, 2013 2:02 PM
To: amps at contesting.com
Subject: [Amps] UHF Connectors

On 11/11/2013 10:37 AM, Fuqua, Bill L wrote:
> Isn't "UHF Connector" an oxymoron?

The name dates from the '30s or early '40s.  No question that there's a
small discontinuity due to the Zo of the connector, but it certainly doesn't
matter below 50 MHz, and at higher frequencies is often swamped by line
loss.

Several years ago, I made up a dozen or so lengths of coax for a DX trip
using very low loss cable that I'd bought at a great price, surplus from a
telecom bankruptcy -- construction much like LMR400, except #10 solid copper
for the center, excellent braid/foil shield.  As a test, when I was
finished, I connected them all in series, about 1,200 ft, and measured with
HP generator and HP spectrum analyzer up to about 500 MHz.
I had about 23 83-1SPs and 11 or 12 barrels in line. The loss at 500 MHz was
less than the published spec for the cable. Loss was measured by
substitution (that is, differencing a short direct connection between
generator analyzer with the cable under test) at all of the test
frequencies.

73, Jim K9YC
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