[Amps] Pi-L Check

[John Irwin]

There seems to be lots of information on pi and pi L  output circuits including caculated values but there is little if anything  on the pi network input network for the grounded grid type amplifier.  either in the arrl handbook or  the w6sai west coast handbook.
  
john kb9tc

Larry Carman <lncarman at swbell.net> wrote:
I've written a pi and pi-L program using PHP and put out on the internet.
It's based on the calculations from the 1994 ARRL handbook.
http://www.pinebeetle.net/pi_calc.php and
http://www.pinebeetle.net/pi_l_calc.php . Very simple to use. Feel free to
use and let me know of any problems or additions that might be of use.

Regards,
Larry N5BIP

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of Ian White G3SEK
Sent: Thursday, February 17, 2005 2:33 AM
To: amps at contesting.com
Subject: Re: [Amps] Pi-L Check


wc6w at juno.com wrote:
>
>Good evening to the group,
>
> I've cobbled together a Quick Basic Pi-L program that calculates the
>coils at the nominal output impedance (52 ohms) and at the high end of
>the wider bands.
>
> It then recalculates the C's, the effective Q and the midpoint Z at
>higher (100 ohm) and lower (25 ohm) load impedances and at the band
>edges to allow for real world margins. The L's remain fixed during
>this second pass.
>
> Unfortunately, I "lost" my older "standard" version Pi-L program in a
>Gatesian event a couple years back.
>
> Does anyone have a (modern verison) Pi-L program handy who could
>provide some check L & C values?
>
> A single point should suffice... say:
> 2000 ohm input
> 300 ohm mid-point
> 52 ohm output
> at 4 MHz
> Q = 10
>
>73 & Thanks!
> Marv WC6W

There is an Excel spreadsheet on my website, which does both Pi and Pi-L
output networks (but not input networks).

It can also include stray L and C, and a parasitic suppressor if you
wish; but you can set all those values to zero for cross-checking.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek
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