[Milsurplus] 6AQ5 Tank

[DeWitt Clay]

Good. see comment below:



----- Original Message ----
From: J. Forster <jfor at quik.com>
To: David Stinson <arc5 at ix.netcom.com>
Cc: ARC-5 List <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net
Sent: Wed, July 20, 2011 7:04:17 PM
Subject: Re: [Milsurplus] 6AQ5 Tank

> Ok all you smart people-
> I'm looking at a 6AQ5 Pierce crystal oscillator/tripler
> with a plate tank circuit which outputs at 24 MC.
> The plate tank capacitor is 40 pFd.
> The capacitive reactance at 24 MC is only 166 ohms.

To get the equivalent impedance: 
You have to multiply by the Q (Squared)  If the Q=10, then (10 X 10) times Xc; 
it will look like 16.6K. 

Use (1 + Q) (Squared)  for better accuracy especially for low Q circuits.

>
The frequency scales as the SQ. RT. of LC

24 MHz / 3.9 MHz = about 6, so the C needs to be 6*6 *40 pF = 6*240 = 1440
pF.

This is probably still too large. I'd increase the number of turns on the
coil by about 6 and the C to about 240 pF. 

Best,

-John

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