[na-user] Re: Activating External Voice Keyer

Tom Branch Tom Branch" <k4nr@earthlink.net
Sun, 15 Nov 1998 21:49:35 -0600


Glenn,

Thanks for the pin-outs on the LPT port.  I should be able to use pin 17
for the CW as well.  Now off to buy some RG-174, some 1k resisters, and a
handful of 2N2222s.  I'll have to look this over as the MFJ-432 uses +5
volts instead of ground to activate the memories.  I had planned on chokes
on all the cables as I've seen what RFI can do to keyers.  I have an old
Ham Keyer that would lock-up on certain bands from the RFI.  Some chokes on
the cables solved that problems.  For the bypass caps did you use a .0047uf
from the input to ground?

TU es 73 de Tom, K4NR

----------
> From: Glenn Johnson W0GJ <gjohnson@northernnet.com>
> To: Tom Branch <k4nr@earthlink.net>
> Subject: Re: Activating External Voice Keyer
> Date: Monday, November 16, 1998 2:53 AM
> 
> Hi Tom!
> 
> Easy!!!
> 
> I've built up several control boxes to interface both NA and CT with
voice
> keyers.  It is very easy with optoisolators  OR the 2N2222 switches.  The
> secret is to know which pins of the LPT port are connected to the Funtion
> keys.
> 
>  ESCape is pin 2
> F1                        3
> F2                        4
> F3                        5
> F4                        6
> F5                        7
> F6                        8
> F7                        9
> 
> Ground is pin 11 & 25
> 
> 
> The above is the setup for CT.
> 
> For NA it is a little different.
> 
> Pin 7  selects between two transmitters (audio or key switching)
> Pin 8 selects receiver audio between two receivers
> Pin 9 turns on the stereo function if using two receivers.
> 
> 
> For TR  there is some more:
> 
> Pin 1 is the "strobe" for CW
> Pin 17 is for CW keying line
> Pin 16 is the PTT line
> Pin 14 is the relay control to select one of two radios
> Pin 12 is the DIT input from a paddle
> Pin 13 is the DAH input from a paddle
> Pin 15 is the foot switch input
> 
> 
> If you need any more info, let me know.  I've built up all kinds of
> interfaces for NA & CT....and currently am working on the NA interface.
> 
> IF you are using the MFJ voice keyer, remember what you have in front of
you
> is JUST THE BEGINNING of a BIG PROJECT.  To get it to work properly, you
> will need to double the weight of the box with bypass capacitors until
there
> is less than 1 cubic millimeter of space inside.  You will double the
weight
> again with toroid chokes on EVERY cable going in and out INCLUDING the
power
> supply.  Trust me on this one!!!!!
> 
> 73! Glenn W0GJ
> 
> 
> 
> 
> 
> -----Original Message-----
> From: Tom Branch <k4nr@earthlink.net>
> To: NA-User Reflector <NA-USER@contesting.com>; DX4Win Reflector
> <dx4win@qth.net>
> Date: Sunday, November 15, 1998 8:13 PM
> Subject: Activating External Voice Keyer
> 
> 
> >Greetings,
> >
> >I'm trying to find a way to interface my external voice keyer to NA and
> >DX4Win.  The usual 2N2222 circuit can be used to switch the 5 volts, but
> >how can you select which recording to use?  Any ideas on an interface?
> >
> >73 de Tom, K4NR
> >
> 

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