[Lowfer] Variometer tickler coil adjustment - Question ???

[Peter Cranwell]

Not knowing about the specific variometer you are using, it would depend on
how the tickler coil is wired.  It could either add or subtract from the
inductance, when in coaxial position.

Pete

WA2EIN

-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net]
On Behalf Of W5JGV (Ralph Hartwell)
Sent: Sunday, August 30, 2009 8:53 PM
To: Discussion of the Lowfer (US, European, & UK) and MedFer bands; 600
meter group
Subject: Re: [Lowfer] Variometer tickler coil adjustment - Question ???

> Is there a physical position of the tickler coil in relation to
> the fixed coil the provides Maximum " Q " in the variometer ??


Yes.  Since the resistance of the coil is fixed, then the Q will be
greatest when the inductance is the highest.

The highest inductance setting is when the adjustable coil is coaxial
with the outer inductor so that the inductance of both coils is
additive.  Minimum inductance is when the adjustable coil is rotated 108
degrees from the maximum inductance position.

Verified with my 166.5 KHz variometer and my inductance/Q meter.

73,

Ralph   W5JGV - WD2XSH/7

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