That's right - and it doesn't have to be that close to a 1/4 wl or odd
multiple to be a problem.
If you feed a 50 Ohm load through a 75 Ohm line, any line length from
around 0.15wl thru 0.35wl (or repeats) will give you an SWR(50) of 2:1
or greater. That's enough for the protection circuitry in many radios to
beginning backing off the output power.
Steve G3TXQ
On 16/12/2013 00:21, Richard (Rick) Karlquist wrote:
If you are driving a multiband antenna, it is actually
quite likely to have near a 1/4 wl on some frequency especially
if you have a few hundred feet of coax.
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