[GreenKeys] M28 ASR full duplex?

[W2HX]

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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