[Lowfer] How do I....

[Michael Sapp]

J.B.   A quick check with an online LC calc shows me you would need 1500pf 
or so with 1.8mH to get under 100kHz, That seems like a lot of pf
for distributed capacitance, but not having made and tested one of those 
loops I'm not sure of what to expect.

You could disconnect and isolate individual turns of the loop and test them 
as capacitors with the LCR meter.

Typically the LC meters use 1000Hz as the test freq, so the self-inductance 
of one turn
should/may not be that significant on the measured capacitance value....

Then the question is if the distributed capacitance between each set of 
turns in the loop adds up in parallel and in a linear fashion?

At least you would have a ball park estimate for distributed capacitance per 
turn.....

Perhaps just hooking the loop to a wide band LF converter and looking for 
peak receiver noise with a PC waterfall would be easiest. If that result was 
comparable with

a self resonance estimate, you would have two different measurements for 
confirmation.....

Bob's LED indicator is a neat solution.....

73 Mike wa3tts






----- Original Message ----- 
From: "John Bruce McCreath" <weazle at hurontel.on.ca>
To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Saturday, February 22, 2014 9:12 AM
Subject: Re: [Lowfer] How do I....


>> I would think you at least need a diode detector and sweep the loop.
>
> Thanks Mike,
>
> I'll give that a go, as my audio generator goes up to 100 kHz. and I've
> got a high input Z digital voltmeter to look for the peak.
>
> 73, J.B., VE3EAR
>
> LowFER Beacon "EAR"
> 188.830 kHz. QRSS30
> EN93dr
>
>
>
>
>
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