6 Meter long wire matching

Tom Azlin, N4ZPT n4zpt at cox.net
Sat Jan 5 19:52:07 CST 2008

Hi Bob,

If you are using it only on 6 meters then you do not need to get an 
impeadance transformer. Just hook coax directly to the wire a quarter 
wave from the end away from where you want the gain. Impedance there is 
about 72 ohms.  (free end is high impedance so the quarter wave point is 
low.   1.5:1 is a fine match.

73, Tom n4zpt

Robert Bruninga wrote:
> For my long-wire 6m beam, I need to match my 50 ohm cable to
> about 400 ohms or so.  I remember you can use 1/4 wave sections
> in parallel to get impedances lower than readily availailable
> coax, but also, you can "series" coax lines to get higher
> impedances.  See attached drawing.
> In other words, two 70 ohm lines can give a section of 140 ohm
> line.  I just cant remember how to hook them up (shields and
> grounds), etc...
> Bob, WB4APR
>> -----Original Message-----
>> From: Frank Gentges [mailto:metavox at earthlink.net] 
>> Sent: Thursday, January 03, 2008 4:51 PM
>> To: Tom Azlin, N4ZPT; Bob Bruninga; BOD AMRAD
>> Subject: 6 Meter Radios and Projects
>> Tom, Bob and all,
>> It looks like a lot of good ideas are coming together on 
>> this.  I see a 
>> lot of potential.  My lab has some good test equipment and I
> can make 
>> some space so we can set up a test bed to try out some of this
> stuff.
>> It seems we need to have some sort of get-together and see 
>> how to best 
>> proceed on various aspects.  Tacos some Saturday might work 
>> or perhaps 
>> something more is needed.  Thoughts?
>> Frank K0BRA
>> ------------------------------------------------------------------------

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