Why not just plug a straight key into the rig or have you all forgotten
what they are!!!!!!!!!
As a flunky ex tech plus even I remember what a straight key does and
how to work it!
Also that is the reason we dumped CT and all bought WriteLog which works
73 and maybe you will "upgrade" someday too!
----- Original Message -----
Cc: <email@example.com>; <firstname.lastname@example.org>
Sent: Friday, August 04, 2000 2:09 PM
Subject: Re: [ct-user] LPT Keying Cable? Problem
> I would also like to find out just what was the fix!!
> 73, Ted K2QMF
> On Fri, 4 Aug 2000 09:48:08 -0400 "Dallas Carter" <email@example.com>
> >> I missed it.
> >> What is the solution ?
> >> What was positive - what was negative ??
> >> After all of this, please share the details.
> >> Robert E. Naumann
> >> N5NJ / V26O
> >I have seen several requests for a repeat of the suggestions that I
> >with regard to Franks keying problem. Hope this reprint of the
> >message to
> >him sheds some light on the solution. W3PP...
> >Frank, I think I have read most of the responses to your query, and
> >responses to them. I take it you are still in a quandry as to what
> >problem is. I am not the worlds best theorist, and usually just
> >emperical solutions, so forgive me if I am not theoretically pure in
> >It would seem to me that first you must determine whether the
> >in the s/w, computer, interface or the radio. Here is the process
> >that I
> >would adopt, then I will provide, what I believe is background,
> >some relativily common problems.
> > Unplug the keying interface from the radio. With an ohm meter on
> >the x1
> >ohms scale, connect one lead to the keyed element (ring or tip) and
> >other to the sleeve of the phone plug. Send a message and note if
> >moves to the rythm of morse. You may have to reverse the leads.
> > If the meter is moving, you know that the s/w and
> >ok, and that the interface is doing something. You have obviously
> >to see that shorting these two points together while connected to the
> >keys the radio. If so, then it is the interface that, while working,
> >is not
> >sufficient to key your radio. I will explain this later.
> > If the meter is not moving, put the meter on a low voltage, ie
> >scale, and put the black lead on the emitter lead of the transistor
> >interface, and the red lead on the computer side of the base
> > Send
> >another message and check to see if the meter reads the keying
> >voltage. If
> >it is, then you have again confirmed that the s/w and computer are
> > If
> >not, then you need to check out that computer & s/w.
> > In both cases above, if the meter is responding, the problem lies
> >between the computer and the radio, or, the interface. As I recall,
> >interface is an NPN transistor with a base resistor of 1K or so that
> >connected to an LPT pin (the keying source). The emitter is
> >the collector is connected to the radio key line. The base resistor
> >base current so that you dont burn up the transistor, and as the
> >voltage on
> >the base goes positive, the transistor turns on, shorting the
> >collecter to
> >ground, keying the rig. Collector voltage (VCC) is provided by the
> >rig, and
> >is normally plus 12 vdc. Here is the point... If the Beta (gain)
> >transistor is low, and the base resistor is too high, there will not
> >enough base current to turn on the transistor. This may also be a
> >of the radio limiting the collector current and/or voltage. If this
> >is what
> >you are seeing, lower the value of the base resistor and see if that
> >corrects the problem, else try a different transistor.
> > I have eight interfaces that I use here. Some of them will key
> >FT-1000MP's but not all of my TS-940's. One in particular would not
> >key a
> >guest ops 940, and for the contest I just swapped it out with the
> >cable from
> >one of my 940's. I ultimately got it to work on his rig by changing
> >base resistor. His 940 keying circuit aparently takes more keying
> >than my other rigs. One more thing. If you dont see the voltage at
> >the LPT
> >pin, first suspect that the transistor base is not grounded. It may
> >be that
> >the computers lpt port is not wired like most. Should be easy to
> >check that
> >and find a ground source. This is by no means a complete trouble
> >effort that I have outlined for you, but I hope it gives you some
> > very 73,
> >Dallas W3PP
> >WWW: http://www.k1ea.com/
> >Submissions: firstname.lastname@example.org
> >Administrative requests: ct-user-REQUEST@contesting.com
> >Problems: email@example.com
> YOU'RE PAYING TOO MUCH FOR THE INTERNET!
> Juno now offers FREE Internet Access!
> Try it today - there's no risk! For your FREE software, visit:
> WWW: http://www.k1ea.com/
> Submissions: firstname.lastname@example.org
> Administrative requests: ct-user-REQUEST@contesting.com
> Problems: email@example.com
Administrative requests: ct-user-REQUEST@contesting.com