[amsat-bb] LMR-400 direct to antenna or no?
tosca005 at umn.edu
Sun Apr 3 01:43:10 UTC 2016
What he said. In other words, I concur. I have had a whole bunch of VHF/UHF
antennas fed witl plain LMR400 for years, and with a bit of a coil around
the mast, it all worked fine.
73 de W0JT/5
On Thu, Mar 31, 2016 at 8:43 PM, w4upd <updwrb at bristor-assoc.com> wrote:
> I would do like I did to my 9913. This is rather stiff cable. I went a
> couple of turns loosely around the mast and around the boom for elevation.
> I would do this with the antennas at 0 elevation and 360/0 degree azimuth.
> In this way it acts like a simple spring which opens or tightens slightly
> as the rotation of the mast and/or boom occur. I had my 9913 this way for
> over 15 years without a problem. I suspect the LMR400 should work the same.
> In this way you are not inducing any losses with additional cables and
> Just my two cents.
> Reid, W4UPD
> Amsat: 17002
> On 3/31/2016 9:35 PM, Scott wrote:
>> I hope to put up my first rotating antenna soon and just received a nice
>> length of LMR-400 to use. (regular, not "super-flex")
>> Having never seen LMR-400 before, I did not know how flexible it would
>> be. I would call it "medium"... not stiff as a pipe but not floppy, either.
>> My question is whether anyone using LMR-400 can recommend whether I
>> should attach it directly to my antenna (with slack loops, of course)?
>> Or, should I get a few meters of something more flexible to attach to an
>> antenna that needs to be free to rotate 360 degrees?
>> If a jumper is recommended, I would appreciate suggestions on what cable
>> would work best for the task. The frequency for this project is 70cm.
>> -Scott, K4KDR
>> Montpelier, VA USA
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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