[Amps] Swan Mark 1 on 160 meters

[jim.thom jim.thom@telus.net]

Date: Thu, 1 Jul 2021 02:19:03 -0700
From: Jim Brown <jim at audiosystemsgroup.com>
To: amps at contesting.com
Subject: Re: [Amps]
On 6/30/2021 7:46 PM, Jim wrote:
> Jim
>
> We were speaking of using toroids for RF TANK CIRCUITS.
>
> Not common mode chokes.

<I clearly understand that, and I'm pointing out how you and other
<designers can figure out which materials are suitable for THOSE uses,
<which are inductive. You clearly did not read or study my post. I
<suggest that you carefully study it and use what you learn to study the
<Fair-Rite data.

<Your post suggests that ALL magnetic materials in toroid form are all
<same, but, in fact, there are HUGE differences between magnetic
<materials made as toroids. We've used resistors with radial leads for a
<century, but all resistors are not the same. And so on.

<73, Jim K9YC

##  what's used for  160m tank circuits is powdered iron  toroids, type 2.
These are the red ones.  Permeability of 10.

##  I would like to know the config of  W7RY's  8877 amp tank circuit. I'm
assuming it's a HB amp ?   On paper, with a shorting switch used, there
should be no issue..when operating on any band.   I suspect that on 10m,
coupling is taking place, or perhaps an internal switch resonance issue.
This is the 1st time I have heard of the 160m powdered iron core heating
up, when operating on 10m. I will see if I can find the original thread
from 8 years ago.

Jim  VE7RF