[Lowfer] How do I....

[Michael Sapp]

Well., have fun with it. The only thing I hear down therre with my e-probe 
is 120Hz harmonic noise.......one of these days I'll have to try a VLF 
loop.......

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: Sunday, February 23, 2014 10:46 PM
Subject: Re: [Lowfer] How do I....


>> Just a guess on my part, but it would be interesting to see what adding 
>> two to four .01uf caps across the loop would accomplish.....with a 
>> handful of .01 and .005 caps
>> you may be able to infer where the (fundemental) self resonance is by 
>> substitution.....there is a chance you may be currently observing a 
>> harmonic resonance....
>
> That can be done, as just today I found my stash of Sprague Black Beauty 
> style caps!  I'm surprised that you haven't made mention of the 
> transformer I'm using in an
> attempt to Z match the loop to the PC's mic in jack.  In checking the 
> specs on the Hammond site, I found that its frequency response is 30 Hz. 
> to 20 kHz. + or - 1 dB.
>
> I'll try your suggestion of the caps, both in parallel with the loop 
> windings across the transformer's 8 ohm winding and in a series string of 
> the three as well.  With the
> cap(s) in series with the loop winding, it should result in a low Z 
> circuit and hence a better match for the transformer.
>
> I don't know what I'm picking up with the setup, but whatever it may be, 
> it sure is interesting.  There are an almost musical sound to some of 
> them, with both single
> notes and complex/wide choruses, with the odd ping as well.  The neatest 
> sound I've heard so far is like the hee-haw of U.K. police car sirens!
>
> 73, J.B., VE3EAR
>
> LowFER Beacon "EAR"
> 188.830 kHz. QRSS30
> EN93dr
>
>
>
>
>
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