I use LMR-400 DB on the VHF side. With a 130' run it's lossy. Previously, it was on both UHF and VHF.
Replaced the UHF side with LDF4-50A that was dumpster retrevial just after an unnamed blue and white railroad ran their last train out. Much better.
With a 130' run was lossy at UHF. Preamp is necessary. On the VHF side, a preamp is usually un-necessary.
Rotator loops are 9913F7. Be sure to get the correct N connectors as this has a larger center conductor. Several stranded strands can be trimmed if they are unavailable.
On Thu, Mar 31, 2016 at 9:43 PM, w4upd updwrb@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 connectors.
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.
Thanks!
-Scott, K4KDR Montpelier, VA USA _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb