Yes, this is my understanding as well. Except for a few times when I was 
running mobile and just used the internal keyer, the use of my two Scouts was 
always with an external keyer. I never experienced the frequency jumping with 
either my 555 Scout or 556 Argo Scout that so many others complained about.
Cheers/73,
Kevin, K9IUA
---------------------------------------------
Kevin Anderson, Dubuque IA USA, K9IUA
k9iua (at) yahoo (dot) com
     On Tuesday, June 2, 2020, 11:26:31 AM CDT, William Redfearn 
<n4elm@bellsouth.net> wrote:  
 
  Its been a while since I had a Scout & Argo but I seem to remember that using 
an external keyer reduced or eliminated the drift effect.
73 - Dave, N4ELM  
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