Re: Grid Dip Oscillator

• To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
• Subject: Re: Grid Dip Oscillator
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 25 Nov 1997 21:24:48 -0600
• Approved: tesla-at-stic-dot-net

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Tuesday, November 25, 1997 2:24 PM
To: 	Tesla List
Subject: 	Re: Grid Dip Oscillator

Hi Ed,
        Good point....

> From:   Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
> Sent:   Monday, November 24, 1997 2:17 PM
> To:     tesla-at-pupman-dot-com
> Subject:    Re:  Grid Dip Oscillator
> 
> "Not really. You have to get too close to the secondary coil to use
> the thing and that seriously affects frequency.
> 
> Malcolm"
> 
>     Wrong!  You can couple inductively to the "bottom" (grounded)
> end of the coil without affecting its resonant frequecy at all,
> as far as I can tell.  If I had the ambition (I don't) I'd
> draw up the schematic and coil dope for my LF dipper.  Measurements
> Corporation used to sell one called the "Megacycle Meter" if my
> memory serves me right.  They sold extra coils which would let it
> tune down to around 100 kHz.

I stand corrected. I presume one can use it without being close to 
the windings then? Coupling into the base would certainly do the 
trick.

Malcolm

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