|
|
Post by lamplighter on May 5, 2009 21:36:42 GMT -5
I've noticed that most matching methods for beams seem to bring up the match from say, 25 to 50 ohms, or for dipoles use 4:1 baluns to bring down from 300 to 75 ohms. Is there an easily made, non ferrite cored balun or other system that will match down from 100 to 50 ohms, that is, a 2:1 match?
|
|
|
|
Post by zman on May 9, 2009 20:34:54 GMT -5
I have used a 1:1 balun made from RG 213 coax for some of my beams. My Cushcraft A4 tribander uses a 1:1 coax balun with 8 turns and it works great. Even with 1300 watts the swrs stay the same.
|
|
|
|
Post by lamplighter on May 9, 2009 23:05:54 GMT -5
Thanks for the reply. I'll look into it.
|
|
|
|
Post by zman on May 11, 2009 17:46:20 GMT -5
Just dont use any type of coax that uses a foam core with those tight coils in the construction of a 1.1 coax balun.. The heat and sunlight will soften the center insulator causing the center conductor to "wander" to the shield and cause a short.
|
|
|
|
Post by lamplighter on May 11, 2009 21:19:16 GMT -5
Thanks. I'll make sure of it considering some of my stuff is foam, some isn't.
|
|
