|[AMRadio] FW: Wanted transformer Gates BC 1 G|
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,
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