[na-user] Re: Activating External Voice Keyer
Tom Branch" <firstname.lastname@example.org
Sun, 15 Nov 1998 21:49:35 -0600
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 <email@example.com>
> To: Tom Branch <firstname.lastname@example.org>
> Subject: Re: Activating External Voice Keyer
> Date: Monday, November 16, 1998 2:53 AM
> Hi Tom!
> I've built up several control boxes to interface both NA and CT with
> 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
> 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
> 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
> is less than 1 cubic millimeter of space inside. You will double the
> again with toroid chokes on EVERY cable going in and out INCLUDING the
> supply. Trust me on this one!!!!!
> 73! Glenn W0GJ
> -----Original Message-----
> From: Tom Branch <email@example.com>
> To: NA-User Reflector <NA-USER@contesting.com>; DX4Win Reflector
> Date: Sunday, November 15, 1998 8:13 PM
> Subject: Activating External Voice Keyer
> >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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