6 Meter long wire matching

[Glenn Baumgartner]

For all.  I have found that the LDG  corp 2:1 and 4:1 baluns which are rated 
2-30 MHz actually work perfectly up to 54MHz.  Tested them back to back and 
could see no more loss at 50 than at 25 MHz.  Pretty quick way to get a 
match for those less adept at winding cores than Frank.  Perhaps good for 
the "appliance operators" who will surely glom on to this idea as soon as we 
have a good solid working set of hardware and soft ware.
----- Original Message ----- 
From: "Frank Gentges" <fgentges at mindspring.com>
To: <bruninga at usna.edu>
Cc: "'Tacos'" <tacos at amrad.org>
Sent: Thursday, January 03, 2008 7:30 PM
Subject: Re: 6 Meter long wire matching


> Bob,
>
> I am here looking at "Transmission Line Transformers" by W2FMI both the
> original version and the second edition.  9:1 unbalanced to unbalanced
> is covered but is HF with some roll off at 6 meters.  I think a tweak or
> two could reduce the loss at the expense of 160 meters.
>
> I will dig through my collection of cores and see if a simple
> reproducible design can be made.  I have had good luck with these
> ferrite transformers in the past.  Hopefully, this luck will continue
> into the future.
>
> Frank
>
>
>
>
> 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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>>> Tacos at amrad.org
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>
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