[Lowfer] Copper pipe loop question

[jrusgrove at comcast.net]

A 'small' single turn loop used as a broadband low frequency receiving antenna 
needs to be terminted in 'ideally' a zero ohm impedance amplifier ... not 50 
ohms ... in order to extract maximum available signal levels. Yes, his 
preamplifier uses a 1:40 transformer feeding the gate of the FET, but more 
importantly it also has a 1 turn winding from the source to ground coupled to 
the transformer. This winding provides current feedback and drives the 
amplifier input impedance to a very low level.

Jay W1VD         





----- Original Message -----
From: John Bruce McCreath <weazle at hurontel.on.ca>
Reply-To: Discussion of the Lowfer \(US, European, & UK\) and MedFer bands 
<lowfer at mailman.qth.net>
To: wa3tts at verizon.net <wa3tts at verizon.net>, Discussion of the Lowfer (US, 
European, & UK) and MedFer bands <lowfer at mailman.qth.net>
Sent: 1/29/2025 10:05:19 PM
Subject: Re: [Lowfer] Copper pipe loop question



Hi Mike…..thanks for the link to the video. I watched it several times, pausing 
at the
interesting points to take a better look at things. His toroid and secondary 
winding
was especially so, and I finally heard the number of turns, which is close to 
mine!

I got a cheque in the mail today from our provincial government, trying to buy 
my
vote in an upcoming election. I think I’ll spend some of it on the copper pipe 
and
give my idea a go!

Tnx & 73, J.B., VE3EAR


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