Rich
I'm using 9913 on the delay lines for my triangular array on 75 meters. I
had to use 9913 due to velocity factor requirements. However, with any air
dielectric coax you should try to run it in conduit or bury it as exposure
to moisture and the sun will cause condensation inside the coax causing REAL
problems when using your new 2KW amplifier. My RF engineer here at work and
I had a conversation on this subject and he says that his Belden rep points
out that you can bend 9913 but dont kink or pinch it as you would with a
tie wrap...there would be problems at these points along the coax especially
if running at legal power.
All of my delay lines are straight out of the phase box to the verticals so
I can't comment on the coiling of the coax.
carl AG6X
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com]On Behalf Of RCARIELLO
Sent: Thursday, October 30, 2003 1:35 PM
To: Towertalk; FCG; YCCC
Subject: [TowerTalk] Delay Lines useing 9913 TRUE or FALSE
Hello to all.
I have been told not to use an air dielectric coax such as Belden 9913 for
delay lines. It seems the velocity factor changes as the cable is
tie-wrapped or coiled which would effect its electrical length.
Rich AA2MF
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Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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