35 ohm coax question
 

Does anyone know of a source of 35-ohm coax? I googled for it but all
I found was some instrumentation cable which had way too much loss at
the frequencies that I want to use it for. I know this sounds strange
but I want to make a 1/4 wave impedance matching line for an 80 meter
camping antenna.

"Joe B" wrote in message
om...
Does anyone know of a source of 35-ohm coax? I googled for it but all
I found was some instrumentation cable which had way too much loss at
the frequencies that I want to use it for. I know this sounds strange
but I want to make a 1/4 wave impedance matching line for an 80 meter
camping antenna.


Put two pieces of 75 Ohm coax in parallel. Cut the two pieces from the same
reel.

Tam/WB2TT

Joe B wrote:
Does anyone know of a source of 35-ohm coax?

The Wireman has RG-83A for $3 a foot - Stock # 165.
Do you want it that bad?

How about simply paralleling two pieces of 75 ohm
coax for a Z0 of 37.5 ohms?
--
73, Cecil, W5DXP



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On Fri, 09 Apr 2004 16:11:24 -0500, Cecil Moore hath writ:
Joe B wrote:
Does anyone know of a source of 35-ohm coax?

The Wireman has RG-83A for $3 a foot - Stock # 165.
Do you want it that bad?

How about simply paralleling two pieces of 75 ohm
coax for a Z0 of 37.5 ohms?

Thanks the 'trick' I use for my Field Day, 40M Vert. array.
I use two 1/4 wave, 75 ohm pieces of coax in parallel to
match the antenna to a run of 52 ohm feedline. WLAC.

73
Jonesy
--
| Marvin L Jones | jonz | W3DHJ | OS/2
| Gunnison, Colorado | @ | Jonesy | linux __
| 7,703' -- 2,345m | config.com | DM68mn SK

Does anyone know of a source of 35-ohm coax?

Parallel 2 pieces of 75 ohm coax.

I want to make a 1/4 wave impedance matching line for an 80 meter
camping antenna.

I use a 100' roll of #18 stranded wire for my 80M camping/portable dipole. I
feed it various ways.
One way I have been looking at that doesn't require a tuner: Get the 100'
dipole about 30'-40' up. (This is for 3.8 MHZ.) Feed it in the center with
39' of your favorite 300 ohm TV twinlead. At the far end of the twinlead,
short the conductors. 3' from the shorted end, attach your 50 ohm coax (thru a
balun of course).
I haven't tried this, but I will, and I am sure I am not the first to dream
this up. Modelling says this should provide a 1:1 match at the design
frequency. If you use 450 ohm line, it takes about 30', but 450 ohm line is
bulkier.


73 Gary N4AST