[amsat-bb] satellite flexible rotor-section coax question

[Howie DeFelice]

Hi David,

I have been using LMR-240-UF for that application with great success. A 10' piece is only .6 dB loss at UHF. For all the current LEO satellites that should not degrade performance enough to make a huge difference.

Howie AB2S
________________________________
From: AMSAT-BB <amsat-bb-bounces at amsat.org> on behalf of David J. Schmocker <kj9idave at charter.net>
Sent: Sunday, August 26, 2018 8:24 PM
To: Gary Lockhart via AMSAT-BB
Subject: [amsat-bb] satellite flexible rotor-section coax question

Hello:
New to satellite communication I plan to construct a fixed station to work
satellites.

I am looking to identify best type of coaxial cable to run from my VHF/UHF
antennas around az/el rotors to the preamplifier (located on the fixed
mast/support).

Most important coaxial cable requirements include:

Highly Flexible (in upper midwest climate: temperatures range from ­15 deg
to +100 degrees F) in Repeated (continuous) flexing
Low Loss (while super flex Heliax would be my preference, it¹s not designed
for repeated flexing this application sees
Full shielding (preserve S/N and overall system noise figure).

I can compare the loss values from manufacturer data sheets; my main
interest here is to learn what type of cable has withstood the repeated
(continuous) flexing required to work satellites?

What cable type do you recommend based on your experience?   Thank you   73,

Heliax Superflex?    Times Microwave LMR-600UF?   EcoFlex 15 Plus?   Belden
9913Flex?   Something else?

David J. Schmocker, KJ9I


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