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[AMPS] PI-L network inductor wire sizes

To: <>
Subject: [AMPS] PI-L network inductor wire sizes
From: (
Date: Wed, 10 Feb 1999 01:18:25 -0500

On Tue, 9 Feb 1999 15:35:42 -0600 "Roy Koeppe" <> writes:
>L1 has much greater, internal circulating currents than L2 has. With 
>loaded Q's, L1 could easily have ten times the current of L2.
>73,   K6XK

Not likely. If the 50 Ohm current is 5-6A then there would not be any ham
amps produced that would survive with 50-60A in L1. I would guess 2-3
times would be more in line with a good design. 
In my experience with PI-L's it is a voltage breakdown and not current
heating that destroys many bandswitches.

73  Carl  KM1H

>-----Original Message-----
>From: <>
>To: <>
To: <>
>Date: Tuesday, February 09, 1999 3:14 PM
>Subject: [AMPS] PI-L network inductor wire sizes
>>  In a PI-L output network, is the RF current the same or different 
>in the
>>inductor (L1) and the L inductor (L2) ?
>>    On the one hand, it would seem that the currents would be the 
>>the inductors are in series. However on the other hand, since the 
>is a
>>stepdown impedance transformer, it would seem that the current in L2 
>>greater than in L1 due to the transformer action.
>>    In most of the amp designs that I have seen, the 10 meter portion 
>of L1
>>typically is 1/4" tubing and the 10 meter portion of L2 is #12 gauge 
>>     If the current is the same or greater in L2, why shouldn't the
>>of L2 be at least as large or larger than that of L1 ?
>>     Thanks to anyone who can clear this up for me.
>>  73       Don     K9MUF
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