[Amps] new 2200m/630m amplifier - distorted waveform

[Jim Thomson]

Date: Sat, 2 Jun 2018 13:37:22 -0700
From: Jim Brown <jim at audiosystemsgroup.com>
To: Amps Amps <amps at contesting.com>
Subject: Re: [Amps] new 2200m/630m amplifier - distorted waveform

<WRONG -- again, it depends on what you mean by the word "balun," which 
<is used to describe at least ten very different things.? A properly 
designed common mode choke wound on a ferrite core, commonly called a 
"current balun," SHOULD be VERY frequency sensitive, in that it should 
present a very high resistive impedance at the frequency of interest. To 
accomplish that, the number of turns and the core material must be 
carefully chosen to put the self resonance at the frequency of 
interest.? I've recently studied and found suitable designs for the new 
480 kHz band, but not for 137 kHz.

<73, Jim K9YC

##  Ok,  Ill bite.  How did you cook up a CM choke for use at  475 khz ? 
Like with at least  5 k ohms of RS...and  RS  > XS.   

##  At 1st glance, type  77  might work. 

Jim   VE7RF