Steve,
I just copy the text from the ARRL book about Cmin. Here goes:
Cmin is the minimum practical capacitance you can expect to achieve with
your circuit, based on your knowledge of the tube output capacitance, stray
circuit capacitance, the minimum capacitance of the variable tuning
capacitors and a reasonable amount of capacitance for tuning. Start with a
minimum capacitance of about 35 pF for vacuum variable capacitors and about
45 to 50 pF for air variable capacitors.
Steve, the Cmin will be the minimum amount of capacitance your tuning
capacitor allows, plus the tube and stray circuit capacitance. So, a Cmin of
35 pf could be 10 pf of Cout from the tube and 15 pf stray capacitance and
10 pF minimum tuning on the tuning capacitor.
Please, if anyone sees any discrepancies with this, please let me know.
Regards,
Larry N5BIP
-----Original Message-----
From: StephenTetorka@cs.com [mailto:StephenTetorka@cs.com]
Sent: Thursday, February 17, 2005 11:48 AM
To: lncarman@swbell.net
Subject: Pi network
Hi Larry:
de Steve, WA2TAK
Very, very nice!!
Thank you a bunch for sharing it with us.
Question please...what is "Cmin"?
Regards,
Steve
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