[GreenKeys] Schematic for Dovetron-to-RS-232

[gil smith]

Hi Clarence:

Yes, to drive a tty machine from the dovetron, you need a circuit that 
converts rs-232 signals to a powered current loop for the tty(s).  The loop 
should ideally be opto-isolated from the 232 side for safety.

If you got one of my TTY232 boards a few years back, you can do it with that.

Or, my latest board, TTY-CONNECT, is getting close to a production board 
run.  The prototype is running on my bench.

Or, you can just solder up a simple circuit on a perf board.  I think there 
is a non-optoisolated loop-keyer design at rtty.com.  You need an external 
loop supply for this one.

gil


At 10:45 AM 2/24/2004, you wrote:
> > Gil excuse me for butting but I am going to run a Model 28
>with my unit...will I need any specisl hookyp...Clarence...
>tnx for listing to my request...73 for now...kb0bfi
> > Hi Web:
> >
> > If you have one of the Tempest Dovetrons, you just need to
> > make a custom  cable.  You need a cable with a couple of
> > BNC plugs and a DB-9F (female)  connector The DB-9F is
> > (properly, but less-commonly) also called a DE-9F
> > connector).
> >
> > The DB-9F plugs into the PC's COM port, one BNC plug
> > connects to the  dovetron's POLAR (232-in) jack, and the
> > other BNC plug connects to the  dovetron's EIA-OUTPUT
> > (232-out) jack.
> >
> > The easiest way to make it would be to get an old BNC to
> > BNC patch cable  (the coax can be anything:
> > thick/thin/50-ohm/75-ohm...):
> >
> > 1)  Cut the coax in half.
> >
> > 2)  Strip the ends of each coax, twist the ground shields
> > together, and  solder this ground to pin 5 of the DB-9F
> > (GND).
> >
> > 3)  Mark one of the BNC plugs "POLAR," and connect its
> > center conductor to  pin 3 of the DB-9F (which is TXD, or
> > data-out from the pc).
> >
> > 4)  Mark the other BNC plug "EIA-OUTPUT," and connect its
> > center conductor  to pin 2 of the DB-9F (which is RXD, or
> > data-in to the pc).
> >
> > If you are only going to receive, you only need the
> > EIA-OUTPUT BNC, which  makes the cable even easier to
> > make.
> >
> > Then on your pc, fire up a baudot-capable terminal program
> > like HeavyMetal,  RTTYArt, or even the old DOS TTYSIM (
> > even runs on XP, but is COM1-only)  and start tuning up
> > your radio.
> >
> > gil
> >
> >
> >
> > At 07:39 AM 2/24/2004, Web Williams wrote:
> > >OK, I should get 50 lashes for asking this question- I
> > apologize! At >one point in time, someone e-mailed me
> > (someone named Jack?) a >schematic for a circuit that goes
> > between a Dovetron Tempest unit >and a PC (I don't have
> > any heavy iron). I've looked all over my hard >drive and
> > cannot find where I saved it, nor can I remember the file
> > >name. (That happens when you have a couple of 100GB hard
> > drives >and don't do much system maintenance...) Anyhow, I
> > would much >appreciate a resend, as I never did have the
> > time to construct the >circuit, and now find myself with
> > some amount of time on my hands >(I recently retired).
> > Also, how does one interface a modern solid >state rig
> > with one of these (Dovetron Tempest)? Any tricks of the
> > >trade? I have an owners manual, but it doesn't mention
> > anything about >how to connect one of these to an RS-232
> > serial port.... >
> > >Someone else mentioned that they wanted to know what
> > software >to use with it. I read somewhere that there is a
> > program called >RTTY.COM. I guess I'll have to look for
> > that one myself, but I >was going to try using MFJ
> > Multicom first to see if it will work. >
> > >73 all, -Web Williams in Myrtle Beach, SC
> > >
> > >
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