Sonny Hood wrote:

I have an antenna that needs 100 ohm twin lead to match the impedance
of the feed point. The 450 ohm lead has messed up the match and
screwed up the resonance, does anone know of such an animal?
K4WYS

Use side-by-side runs of 50 ohm coax to achieve a balanced Z0
of 100 ohms. Tie the braids together at both ends.
--
73, Cecil http://www.qsl.net/w5dxp

Cecil Moore wrote:
Sonny Hood wrote:

I have an antenna that needs 100 ohm twin lead to match the impedance
of the feed point. The 450 ohm lead has messed up the match and
screwed up the resonance, does anone know of such an animal?
K4WYS

Use side-by-side runs of 50 ohm coax to achieve a balanced Z0
of 100 ohms. Tie the braids together at both ends.
--
73, Cecil http://www.qsl.net/w5dxp

Sounds like he may be trying to match a Quad or a Loop. If I am not
mistaken, the usual way to do this is with a 75 ohm Q section.
Side-by-side runs of 50 ohm coax with the braid tied together will
yield 25 ohms because they are in parallel. Not 100 ohms. Or do I
need to dive back into the antenna book?
Gary N4AST

better get out the snorkle... if you tie the braid and the center conductor
together you get a 25 ohm line, i use that all the time for my stack
matching boxes.

wrote in message
oups.com...
Cecil Moore wrote:
Sonny Hood wrote:

I have an antenna that needs 100 ohm twin lead to match the impedance
of the feed point. The 450 ohm lead has messed up the match and
screwed up the resonance, does anone know of such an animal?
K4WYS

Use side-by-side runs of 50 ohm coax to achieve a balanced Z0
of 100 ohms. Tie the braids together at both ends.
--
73, Cecil http://www.qsl.net/w5dxp

Sounds like he may be trying to match a Quad or a Loop. If I am not
mistaken, the usual way to do this is with a 75 ohm Q section.
Side-by-side runs of 50 ohm coax with the braid tied together will
yield 25 ohms because they are in parallel. Not 100 ohms. Or do I
need to dive back into the antenna book?
Gary N4AST

Dave wrote:
better get out the snorkle... if you tie the braid and the center conductor
together you get a 25 ohm line, i use that all the time for my stack
matching boxes.

Nobody said anything about tying the braid and center conductor
together. If the side by side run of 50 ohm coax is used as a
parallel feedline, the braids are tied together and the Z0
is 100 ohms when the center conductors are connected across
the load.
--
73, Cecil http://www.qsl.net/w5dxp

you are great cecil, you cut out the original post to make it look like i
had nothing to do with the original statement... if you will remember he was
asking if he would get 25 ohms if he connected the braids together without
the center conductors... i simply say that if you connect both the braid and
center conductors you get a 25 ohm line... the implication being that if you
don't connect the center conductors you don't get a 25 ohm line.

thanks for keeping the fight thread going so well, now that you are riled up
i guess you can branch out into some other threads and bog them down for the
rest of the week.

"Cecil Moore" wrote in message
. com...
Dave wrote:
better get out the snorkle... if you tie the braid and the center
conductor together you get a 25 ohm line, i use that all the time for my
stack matching boxes.

Nobody said anything about tying the braid and center conductor
together. If the side by side run of 50 ohm coax is used as a
parallel feedline, the braids are tied together and the Z0
is 100 ohms when the center conductors are connected across
the load.
--
73, Cecil http://www.qsl.net/w5dxp

Dave wrote:
if you will remember he was
asking if he would get 25 ohms if he connected the braids together without
the center conductors...

Here's the original posting:
************************************************** ************************
I have an antenna that needs 100 ohm twin lead to match the impedance
of the feed point. The 450 ohm lead has messed up the match and
screwed up the resonance, does anone know of such an animal?
K4WYS
************************************************** ************************

It bears no resemblence to your assertion above.
--
73, Cecil http://www.qsl.net/w5dxp