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bpnjensen wrote:
[...] The radio in question, BTW, is a simple DX-160 - it's front end is pretty wide open anyway, but heck, why not? As long as I don't send a big static charge through it, I figure I cannot do much damage :-) BJ I had a DX-150A in the early 1970s, and if I recall correctly, it had an "antenna trim" control to peak up the input network for maximum signal. The DX-160 may be the same -- the differences were minimal, as I remember. The trim adjustment would help match varying impedances to some extent, but there could be cases where an input transformer would help even more -- with a random impedance antenna on a wide range of frequencies, it's hard to predict without making measurements. Transformers work both ways, so one could add a switch for 1) impedance step-up, 2) impedance step-down, and 3) direct connection. Of course, an antenna coupler is another possible way to approach the impedance issue. With all good wishes, Kevin, WB4AIO. -- http://kevinalfredstrom.com/ |
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