2018-12-11

LW/MW Loop Renewed.

The wires were stuck in the 10/20 turns loop, so new hoops were cut.
The first one is a bit larger than the original one, and was wound with 5 turns. Resonant frequency got up to 2,1MHz, a little low for comfortably using it on the 160m band, so one turn was removed.
The 4 turn loop has self resonance on close to 2.5MHz, so I consider it acceptable for use on the 1.8MHz band.
It looks like an amplifier is needed to get better sensitivity.
The second hoop is intended for a single turn HF wideband loop, tests with transformer and  amplifier should be done this year, as I have a cheap LNA, officially with a low cut off of 5MHz, but I suspect it will work fine on the 80m amateur band, too. A later version will probably be tested with a 1MHz cut off LNA, which is on the way from China.
The 10/20 turn loop will probably be tried out with even lower frequency reception (<100kHz).

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