Why does a change in jumper length change amplifer outout? - Page 2

July 14th 05, 02:50 AM

Dale Parfitt

Posts: n/a

If this is a 2m transmission system 2ft of coax equals 610 mm. Assuming a
coax velocity factor of 0.67 ,the electrical length is 1/ 0.67 * 610
equals
915mm which is about 'half a wavelength'.
Half a wave lenght of transmission line is an 'impedance repeater'
Hence if tx output- and amplifier input impedance are about the same
,there
is max power transfer.

MRF455 is a 60W HF transistor- i.e. 30 MHz and down- from memory.
Dale W4OP

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