I was able to confirm that a series cap increases Q and several
people helped me to understand intuitively what it works that way.
When I model a series L, the results also show an increase in Q,
by a lot more than with the series cap. But, there's a lot of options
for values. After hunting around for a while and not finding a mix
that works, suggestions are welcome.
What should the series L have for a value? I'll model and post the
results.
jeff
----- Original Message -----
From: "Peter Chadwick" <Peter_Chadwick@mitel.com>
To: "Randall D. DuCharme" <randyd@specent.com>; <amps@contesting.com>; "jeff
millar" <jeff@wa1hco.mv.com>; <W8JI@contesting.com>
Sent: Monday, October 16, 2000 4:35 AM
Subject: RE: [AMPS] Series Tuned Tank?
>
> Tom says:
>
> >I've seen it suggested in VHF amplifier articles that this reduces
> >tank Q. That isn't true.
>
> Correct, if anyhting, by having a larger coil, it increases tank circuit
Q. It
> is a technique that allows the use of a practical sized capacitor and
coil,
> though. I've never seen it used on anything above 6146 size. For 813's
(where I
> presume 30MHz is the upper frequency) the series coil technique is
probably good
> enough. Or push pull.
>
> 73
>
> Peter G3RZP
>
>
>
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>
>
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