[GreenKeys] M28 ASR full duplex?

[Nick England]

They just weren’t used in full duplex (except if the aux typing reperf was
independently connected). Normal installation was to the C-1004 box that
you manually switched from CFS REC to CFS SEND. (The TONE position was for
hookups that automatically keyed the xcvr, usually UHF).
https://www.navy-radio.com/rtty/c1004.htm

I guess I just don’t understand when you would run full duplex using a
single TTY.
If you wanted to receive while transmitting you just used an additional TTY
printer or reperf.

Read more about the Navy’s view of RATT
https://www.navy-radio.com/journal.htm

And
https://www.navy-radio.com/commsta/circuit/THE20GOLF20SYSTEM.jpg



On Sat, Apr 8, 2023 at 3:14 PM Duncan Brown <duncanancy at earthlink.net>
wrote:

> Eugene,
>
> Thanks,
>
> I see now how the TX & RX of the  CV-2460 terminals can be strapped
> together.  (I had not seen the rear panel of the CV-2460 and assumed
> there were connectors)
>
> My main question was how is the UGC-6 used in full duplex operation?
> Fig 12-38 does not show that option.
>
> Sorry, no extra rack ears.
>
> Duncan
> K2OEQ
>
> On 08-Apr-23 14:12, W2HX wrote:
> > Duncan, I don’t have the LESU that you have (probably) but all of the
> possible connections do come out to the rear barrier strips. You definitely
> can separate RX and TX on these if you want to. The CV-2460 allows both
> full duplex and half duplex operation. For full duplex you use all 4
> connections. For half-duplex you put 2 of the 4 connections in series and
> pull off the other 2 connections for the teleprinter.
> >
> > Check out page 119/136 in this PDF. Look at option "3" is the
> half-duplex set up.
> > https://w2hx.com/?prefix=x/CV-2460/
> >
> > good luck
> >
> >
> > 73 Eugene W2HX
> > Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
> >
> >
> > -----Original Message-----
> > From: greenkeys-bounces at mailman.qth.net <
> greenkeys-bounces at mailman.qth.net> On Behalf Of Duncan Brown
> > Sent: Saturday, April 8, 2023 2:03 PM
> > To: Green Keys <greenkeys at mailman.qth.net>
> > Subject: [GreenKeys] M28 ASR full duplex?
> >
> > I'm mainly a Kleinschmidt guy, and I have never had to dig into the M28
> wiring before.  Other than change a couple of motor-start capacitors, my
> M28s have just run.
> >
> > But now that I am getting into this M28 ASR wiring for our TMC station,
> it looks like the M28 (especially the AN/UGC-6) was mainly used with TX &
> RX in just one loop.
> >
> > Was the M28 ever used in full-duplex (separate TX & RX loops)?
> >
> > Ham TUs like HAl & Dovetron would take one loop and separate the TX & RX
> signals.  But what about military units like the CV-2460?  Just looking at
> the manual, it looks like it needs separate TX & RX connections from the
> TTY, but the UGC-6 does not seem to offer that option. (At least not from
> looking at the UGC-6 schematic, Fig 12-38.)
> >
> >   From the Teletype Corp. schematics, I can see that the M28 ASR has
> very flexible wiring and you could bring out the keyboard contacts
> separately.  But I'm surprised that the UGC-6 schematic doesn't show that
> option. Or is there another schematic to show separate TX &RX wiring?
> >
> > Thanks,
> >
> > Duncan
> > K2OEQ
> >
> >
> >
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-- 
Nick England K4NYW
www.navy-radio.com
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