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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