[GreenKeys] M28 ASR full duplex?

[Nick England]

See also
https://www.navy-radio.com/circuits.htm


On Sat, Apr 8, 2023 at 4:13 PM Nick England <navy.radio at gmail.com> wrote:

> 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
>
-- 
Nick England K4NYW
www.navy-radio.com
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