[GreenKeys] Dovetron TU question - keying a transmitter

[Nick England]

Hi Guys - Thanks for all the responses. I just assumed there have to be a
PTT output but I guess there wasn't. I came late to the Teletype game and
am just now starting to put together pieces with which to transmit.

All the Navy AFSK TU units include a PTT output to key a transmitter or
transceiver, even the 1950 AN/SGC-1 with octal tubes. So I figured that ham
gear would have included PTT too.

As Ken says, I should be able to find a spot within the Dovetron to tap
into - since internally it clearly does exactly what I want - if I type it
sends the AFSK tones and then a few blanks for a bit before returning to
receive mode - I guess my unit must have the KOS option.

In the mean time, I'll bolt a switch box onto the ASR - the standard Navy
C-1004/SG control box has two modes
1) AFSK ("Tone" in Navy-speak) which expects the TU to handle transmitter
PTT
2) FSK ("CFS"- Carrier Frequency Shift) where the user manually switches
from receive to transmit and there are separate FSK keyer and FSK receive
converter loops.
http://www.navy-radio.com/rtty/c1004.htm

Cheers,
Nick England K4NYW
www.navy-radio.com


On Thu, Nov 29, 2018 at 9:19 PM Nick England <navy.radio at gmail.com> wrote:

> The Dovetron manuals I have leave me frustrated - lots of info about how
> their UARTs work and next to nothing on hooking the box up.
> I want to key a transmitter when I start typing - I assume there should be
> some PTT output (open collector or relay) to make that happen. But I can't
> figure it out. Do they expect that the transmitter will always be keyed by
> VOX?
> Why would anyone leave this info out of the manual????
>
> Okay, I am sure after this rant, some kind soul will say - "Look on page 2
> of a manual on your own damn site.....".
>
> FWIW the Dovetron manuals are at -
> http://www.navy-radio.com/rtty/dovetron.htm
>
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
>
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