On Nov 4, 2004, at 9:39 AM, Bill Turner wrote:
On Wed, 03 Nov 2004 13:58:51 -0500, Will Matney wrote:
Now to me, if the lead(s) length is correct, and the gain high enough,
the internal capacitance of the tube along with the inductance of the
lead(s) could make up a VHF oscillator.
_________________________________________________________
One other factor not mentioned is the Q of the VHF circuit, which has
a great effect on gain. If the VHF Q is very high, oscillations are
almost guaranteed.
Indeed, Bill. The higher the VHF Q at the anode circuit's resonance,
the higher the gain at that frequency, and the greater the chance of
regeneration. The relationship between VHF-Rp, VHF-Q, and VHF gain is
that all are proportional.
VHF Q is usually not known in most amplifier
circuits, and having a parasitic suppressor circuit is just added
insurance. I wouldn't be without one.
--
Bill W6WRT
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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