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Old 15th Feb 2018, 8:04 pm   #36
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
Default Re: My first frame aerial

I'd feed the coupling-loop down a length of 50/75-Ohm coax, with the outer going to the earth-terminal on the radio itself.

But that's because I'm conditioned to using radios designed for 50/75-Ohm antenna feeds.

Interposing obscure baluns etc. in the signal path can only result in signal attenuation - which means the radio's AGC will wind the gain up, so bringing background noise/RFI up as well!

Contextually, I'm wondering if, for MW reception, there could be a place for something like the noise-blanking system used in US WWII aircraft where they phased the signal from the main antenna against the signal from a 'noise antenna' that was deliberately sited in amongst the spark-plugs of the Wright "Cyclone" 24-cylinder radial engine...
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