All, I'll try out the CATV RG-11 before spending my money on 50 ohm coax.
It will also save me the touble of digging another trench. Mike N2MS ----- Original Message ----- From: Carl <[email protected]> To: [email protected], Donald Chester <[email protected]> Cc: [email protected] Sent: Fri, 13 Jun 2014 20:36:49 -0000 (UTC) Subject: Re: Topband: 50 ohm direct burial coax cable Ive been using that CATV RG-11 since the late 70's as jumpers to the hardline from wire antennas, in the house, and as phasing lines for 160 and 80M verticals. Never a hint of heat at 1200W but someone with a 3CX15000 might have a different opinion. Measured loss at 2 MHz was .17dB/100' Several lengths are over 35 years old, reused several times MF to UHF, and pass regular sweep tests. Carl KM1H ----- Original Message ----- From: <[email protected]> To: "Donald Chester" <[email protected]> Cc: <[email protected]> Sent: Friday, June 13, 2014 3:49 PM Subject: Re: Topband: 50 ohm direct burial coax cable > Don, > > You bring up some good points. I got a couple of hundred feet of Flooded > Commscope 75 ohm "RG-11" type at a good proce. I don't have the part > number handy. I've been very happy with it at 100 watts. I'm thinking of > running 500 watts. The center conductor is copper clad steel. I'm > concerned about RF current losses because of the skin effect on 160 > meters. Does anyone have any experience with this type of CATV cable at > high power? > > A 1:5 maimatch may be an issue at the amplifier but I guess I can place a > L matching circuit between the amp and coax to get the SWR down. > > I like Flooded cable not because it is anti-fungal but to keep out > moisture. My coax runs 45 feet underground and 20 feet under my deck. I > had some groundhogs visiting us under the deck and fortunately they didn't > have a taste for the coax. The visitors have been relocated. > > Mike N2MS <snip> _________________ Topband Reflector Archives - http://www.contesting.com/_topband
