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Old 22nd Aug 2020, 8:43 am   #21
Bazz4CQJ's Avatar
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 2,924
Default Re: Lockdown Loop Aerials

Originally Posted by John KC0G View Post
Is this paper by Chris Trask the one which you recall?
Hi John,
yes indeed, and very many thanks for uploading it on to the forum, as I was struggling to relocate it. I'm going to set aside some time this weekend to take a good look at it again!

Data beats opinions most times... that's my opinion, though I have no data on that.
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Old 22nd Aug 2020, 9:01 pm   #22
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Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 767
Default Re: Lockdown Loop Aerials

Originally Posted by Julesomega View Post
The old favourite Si J-FETs for low noise RF applications have been supplanted by SMT types with improved performance. There is one particularly useful one designed for use in car aerial pre-amps but I'll have to search for the packet to remind me of the type number
Quote: "BF862 - N-channel junction FET - CRS: 1.9 pF; IDSS: 10 to 25 mA; IG: 10 mA; Kind: Preamplifiers for AM tuners in car radios"

Not sure why they emphasise the high ft of 715MHz as a requirement for AM reception, but this sounds like something you might want for a PA0RDT mini-whip sort of LF-HF antenna
- Julian

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