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

[gil smith]

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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