On Aug 23, 2004, at 11:52 AM, Luca wrote:
Hi All
I have used on some hf amplifier that I homebrewed, the Pi network
and l did not have the problem with adjustment maintaining C1 and C2
fixed at the table value.
I think to find the resonance with dip meter and moving L contact
point , I am doing right thing . Is it correct?
Now i would like to build the power amplifier using the PL network , I
have the table and formulas but l don' t know the correct procedure of
adjustaiment .Is the same thing like the Pi network adjustment ?
Virgilio - - A Pi network is not like a parallel resonant L-C tank
circuit, it is two L-networks in series, Thus, it is not resonant at
the operating frequency. Instead, itt is typically resonant c. 10%
lower in freq. My guess is that a Pi-L is fairly similar. except that
it is three L-networks in series.
And to find the L2 contact point: Can I read the maximum power
output ? Or are there any other methods?
-- The amount of L1 and L2 are determined mathematically, not
experimentally, based on Q, RL, and freq.
ciao
Many thanks in advance, Luca ik5tsw@virgilio.it
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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