________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Kunde,
Brian
Sent: Tuesday, July 15, 2008 1:20 PM
To: [email protected]
Subject: Low Loss Coax Cable
What coax cable types do you recommend for a very low loss cable up to
6Ghz
but also flexible? I need a good low loss cable to connect between my horn
antenna and the floor connection of my Heliax. The cable only needs to be 5
or 6 feet long but flexible enough so I can change polarization on my antenna.
I have looked at many cable types in catalogs and on-line but you
cannot tell
if it will be flexible without seeing it for real. I ordered a cable called
“Helical Super Flex”. I liked the low loss properties but it was not at
all flexible, let alone super flexible. It was barely semi-rigid in my book .
I tried RG393/U but it is not very flexible and I prefer a lower loss
cable
if possible.
What do you all recommend? What is the best? Where can I buy it in
small
quantities and possibly in custom lengths?
Thanks to all in advance.
The Other Brian
Brian:
I use United Microwave Type 190 coax cable; see:
http://www.unitedmicrowave.com/52.gif
This stuff is rated at about 20 dB/100 feet, and is reasonably flexible. I use
it up to 18 GHz. The only negatives are that:
1.
It won't handle more than about 10 watts in the upper GHz region.
2.
It is not the toughest cable; don't step on it.
3.
The factory attaches the connectors, so you can't buy in bulk and make
your
own custom lengths.
You will find that the factory delivers quickly, that the cable works very
well, and the cost is less than 10% of what a Gore cable would cost. For
instance, a single piece, 24" cable, with SMA's on each end, costs about $80.
Ed Price
[email protected] <mailto:[email protected]> WB6WSN
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (FAX)
Military & Avionics EMC Is Our Specialty
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