Hi. I am the fortunate owner of many THOUSANDS of feet of CATV hardline, (yes, obtained leagally, thank you), that is brand new. It is Timewave and still coiled up. This 75 ohm hardline is the rigid foam type that will not allow water entry.
OK, I have used it in the past at several locations and it's great. However, I have always had this nagging question in my mind....could I make it better?
Realize I have a machine shop and can fabricate very nice connectors/adaptors for the 5/8, 7/8. and 1 1/4 inch cable I have. It has a PVC jacket....which helps with noise on the tower.
My question is this.... If you were putting it up, how would you go from the hardline (just below the rotor), to the antenna...? Yes, I have all the literature on making 'matching transformers' from sections of different impedance line. BUT, there is some loss associated with every connector, etc.
Here's an example..... One station (back in Ky), had 7/8" CATV hardline running to the base of the rotor. From there, I went with one of my connectors to 9913 to the antenna. In this case it was an M2 6M7JHV. It worked great. The SWR was < 2:1 and the 756PRO's tuner handled it with NO problem. I also have a legal limit amp for 50 mHz and since it has a pi-network output, it will easily load up the system.
I am in the process of putting up several towers. Since 6M is my favorite band, I will be sending the 7/8" CATV line up the tower. I really need to buy some NEW coax. My 9913 (non flex), has not been outside except for maybe 5 years... but is 20 years old! LMR400 looks good, in spite of the 50 ohm imp. Should I buy some new 75 ohm cable to go from the CATV hardline to the antenna?
Get it? 50 ohm radio, 75 ohm CATV hardline, 50 ohm flexable, to 50 ohm antenna....or
50 ohm radio, to 75 ohm CATV hardline, to 75 ohm coax to 50 ohm antenna....
Believe it or not, the 5/8" CATV stuff is so light, I thought about running it down the boom of the JHV, but then there comes the 'flexable' portion around the rotor.
Yes, I KNOW I'm splitting hairs here, and I should probably just put up "what I have", but I thought I'd opt for other opinions.
PS, YES, I know that the sight SWR and resulting mismatch really doesn't amount to anything, but I've just retired and I just want to do it and get it right (and forget it!!) I just wanted some differing viewpoints, other than "just put up the stuff and forget it". That's what happens when you have a Type A personality. I want EVERTHING to be PERFECT....