[TRLog] CW Keying Circuit Question

[Michael Tope]

Jack,

Check the T-4XC manual to be sure, but I think the Drake uses grid block
keying (negative voltage). You will most likely need a PNP transistor or a 
FET to key it properly.  

Mike, W4EF........................


Here is a suggested circuit:


           ----------------------*---> +5V
           |                     | 
           >          Emmit______|
           < 10K          /
     1K    >      Base ||/
  <-^V^V^- *-----------|  PNP Transistor
   CPU_Key_Line        |\
   (low = XMIT)          \-----------> to key input T-4XC
                        Coll.


P.S.  You will have to use the INVERT software switch with the Keyer Output Port 
command (e.g. KEYER OUTPUT PORT = SERIAL 1 INVERT) otherwise the CW
will be inverted


-----Original Message-----
From:	Jack Trampler [SMTP:n2jt@fast.net]
Sent:	Sunday, June 06, 1999 3:56 PM
To:	TRLog Submissions
Subject:	[TRLog] CW Keying Circuit Question


My FT-1000MP just went on the blink and I have to send it back to Yaesu.  As
such I will be using my Drake C-line as my main station for a while.  Does
anyone know if the keying circuit in the manual using a 2N2222A transistor
can key the T4XC safely or do I need a different circuit?

73,
Jack - N2JT
n2jt@fast.net
n2jt@arrl.net


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