James Moritz schrieb:
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My cure was to add a low-pass
filter between the matching transformer at the amp output and the coax
feeder - the usual pi-section designs won't help due to the shunt
capacitors at their input, so I used a tee configuration instead with a
series inductor at the filter input. The low-pass filter effectively
isolates the amplifier from the ipedance variations at the load. After
this, I had no trouble. I have occasionally also had problems with class D
amps and peculiar loads - these were also solved using a low-pass filter at
the TX output.
Cheers, Jim Moritz
73 de M0BMU
Hi Jim,
wld you pse give a detailed specification of your tee configuration with the
series inductor at the filter input ?
tks in advance.
regards
Uwe/dj8wx
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