I'm putting together a new contest station and have already decided on/obtained LDF5-50A for the 150ft runs to the bases of the two crank-up towers. Looking for real-life experiences with cable choic
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Mon, 10 Jul 2017 17:34:37 +0000 (UTC)
I've successfully used Belden 9913F7 but wondering if anyone has considered FSJ4-50B Superflex Heliax for this application. -Mike-WA6ZTY From: David Aslin G3WGN <david@aslinvc.com> To: "towertalk@con
I have used LMR-400 for 10 yrs with no problems. I attach the coax, rotator cable to the Feedline standoff arms on my TX-472 MDPL w/ heavy rubber (garden hose) wrapped around to ensure the coax is no
Hi David...I have a US TOWER TX-472MDP and I have 2 runs of Andrews 7/8 hard-lines,one run LMR400 and Belden HD rotor wire all attached to a 1/8"steel messenger cable tied to the top standoff and whe
How tight a coil can the hardline be coiled into. At present I have two runs of Davis BuryFlex taped together with the control cables for the SteppIR and the rotator, and being guided into a large tr
Thanks for the input Mike. My experience with FSJ4-50B is not positive. Ive nicknamed it the firehose as a result of its ability to take on water and have it track down the coax. 73, David G3WGN M6O
David, Have you run the coax loss numbers on the intended frequencies? You may find that going to hard line from the base of the tower is not worth it. Try http://www.arrg.us/pages/Loss-Calc.htm I ju
Definately avoid Superflex outdoors. I could give many dozens of examples of water ingress on commercial installations where Superflex was used outdoors as the jumper between the vertical Heliax fee
Thanks for the input Mike. My experience with FSJ4-50B is not positive. Ive nicknamed it the firehose as a result of its ability to take on water and have > it track down the coax. Almost any coax w
Of course any coax that has a spiral shield or spiral dielectric (like traditional 9913), will *really* take on water, fast. A braided shield will wick water surprisingly fast. Corrugated with hollow
I have a friend who is a ham, and works for a company that maintains cell tower cables and equipment. He says they waterproof hardline connections. I wonder how long it lasts. 73, Keith NM5G --Origin
Follow the directions and I'd bet on more than 10 years. What does your friend say? How often does he replace the LDF6 and LDF7? https://www.rfparts.com/coaxseal/221213.html Grant KZ1W 73, Keith NM5G
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 11 Jul 2017 01:32:36 -0400
I had somewhere between 1500 and 2000 feet of 9913 on a guyed 45G. I believed that a good weatherproofing would do the trick, that is until lightning struck the top of the tower. It not only removed
I've used LMR400UF and Davis BuryFlex on my US Tower 72' tubular crankup. Both worked, but the Buryflex is considerably more flexible. 73, Dick WC1M How tight a coil can the hardline be coiled into.
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 11 Jul 2017 04:13:53 -0400
The UF is about the most flexible I've seen, but durable it is not. BuryFlex is not nearly as flexible, but more than good enough for rotator loops. It also has a very rugged and slippery jacket. I h
Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>
Date: Tue, 11 Jul 2017 18:05:32 +0000 (UTC)
Times Microwave's LMR-400-UF has a thermoplastic jacket that is porous, and has a 7-strand copper center conductor. Times Microwave's LMR-400-DB has a polyethylene jacket that is not porous, is flood
Hi Rich, Thanks for the thought. I developed an Excel spreadsheet for our 6Gs DXpeditions (TX6G, E6GG, ZL7G) that does the same as the arrg calculator but allows multiple segments each with selectabl
Good idea, Dave. Another excellent way to do that is SimSmith, which has data for most popular coax, lets you enter your own data, lets you specify any load, and computes loss in the entire run and i
On 7/11/17 2:51 PM, David Aslin G3WGN wrote: Hi Rich, Thanks for the thought. I developed an Excel spreadsheet for our 6Gs DXpeditions (TX6G, E6GG, ZL7G) that does the same as the arrg calculator but