[AMRadio] FW: Wanted transformer Gates BC 1 G


W5OMR/Geoff w5omr at satx.rr.com
Thu Apr 13 01:24:32 EDT 2006


John Lawson wrote:

> On Wed, 12 Apr 2006, John Coleman ARS WA5BXO wrote:
>
>> 1/4 wave length of 500 Ohm bal line will transform it to 250 ohms.
>
>
>  Attached where?
>
>  And most ladder-line comes in 75, 450, and (IIRC) 600 ohm - to get 
> 500 ohm must one make the tuning stub? To what dimensions? or will 
> 450-ohm work too, but result (I assume) in a slightly different 
> feedpoint impedance?
>
>  Enquiring minds...


Not all transmission line is commercially made.  Two peices of wire, 
with home-brew insulators spaced at at a distance of  'x' part = 500 
ohms.  The formula is out there, somewhere.  Do the math :-)

--
73 = Best Regards,
-Geoff/W5OMR




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