On 10/10/2016 8:37 PM, Josh Fiden wrote: > On 10/10/2016 5:39 PM, Clay Autery wrote: >> All things being equal... IF you are using LMR-400 as the main feedline, >> there is NO REASON to use a different diameter at the rotator... > The point was using a lower loss cable for the long run up the tower, > such as hardline, then flexible cable for the rotor/drip loop and > short distance to the antenna feedpoint. At VHF, this is typical.
Right... I'd use the best/lowest loss feedline I could afford/source, too... and then use a smaller jumper... I was simply responding to the OP who said he was using LMR 400.... and saying that LMR-400 CAN and IS frequently used as that "jumper" for the rotator loop... or something similarly sized in the .4-.5 inch range.... >> Fail to see why an antenna failure or swap would require soldering "up >> the tower"... > Failure is not necessarily the antenna. It could be the solid center > conductor fracture after being flexed too many times :) THAT would be the result of improper design/installation > > If you swap antennas and it's a single run of cable, you have to > manipulate the antenna on the tower to access the feedpoint. Then, for > example, if you put up a longer boom yagi, the feedpoint will most > likely be further away from the tower and your existing feedline won't > reach. Point taken.... I'm not a big part swapper/upgrader... I build things the best I can so I don't have to upgrade, so I didn't think of that... This situation would likely not occur for me, as I said above... I would likely NEVER use LMR-400 for a feedline run up a tower. I'd use the biggest/best feedline I could source/afford. ______________________ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
