[GreenKeys] Nice old picture

[Ralph Mowery]

Could you explain why the tuning fork could not be used from one machine to another if they are the same type and speed ?

As the shaft should turn at the same speed on all of them I don't see where the problem could be.  I have only played with one governed motor and 'tuning fork'.



  ----- Original Message ----- 
  From: Kevin DeWitt 
  To: Howard Weeks 
  Cc: Greenkeys 
  Sent: Thursday, February 11, 2016 11:57 AM
  Subject: Re: [GreenKeys] Nice old picture


  To add to Howards explanation, the PE-77 power plant in the tactical teletype set is DC output, which eliminates the need for the RA87 rectifier. The PE-77 will drive both the motor and loop (using a line unit and plug adapter). The thing I learned about the tuning forks is they aren't exactly the same so if you use the tuning fork from one set to tune another, your readings may be different. Not a huge deal but I spent an afternoon trying to understand why.
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