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Old 29th Jul 2020, 2:13 pm   #48
IanG3XYV
Pentode
 
Join Date: Sep 2014
Location: Bedford, Bedfordshire, UK.
Posts: 172
Default Re: ATU vs. Preamp vs. Active Antenna

Way back in post #7 Bazz referred to LZ1AQ:

http://www.lz1aq.signacor.com/

I bought one of his amplifier kits and made up a loop from 2.5mm cable (I think). It is cleverly fed by Cat 5 cable, one of the pairs being used for the balanced signal and others for power and a switch signal which allows selection of either the loop or a short vertical. It's amazing sometimes to switch between the two aerials. I find the system very effective in reducing RFI across a wide spectrum.

LZ1AQ goes into a lot of theory on his site which I find very plausible. He comes from an academic and practical engineering background and has clearly spent a lot of time on research. He does consider the benefits of a copper pipe loop as against a simple wire and does a thorough analysis of the needs of the all important preamplifier. There are also a lot practical recommendations. All very well worth reading.

Ian
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