[GreenKeys] Navy Teletype Message Generator

[W2HX]

Maybe try adjusting your range finder? Front panel says 50 baud not 45 baud?

Sent from Nine

________________________________
From: Jeff G <jeffg at junknet.net>
Sent: Tuesday, January 24, 2023 9:26 PM
To: Daniel Jones
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Navy Teletype Message Generator

Nothin wrong with spitballing - I'm going to take it back out to the garage and fiddle a bit. One thing I was trying was I had piped a signal gen through it and to a speaker, and had Fldigi listening via a webcam, but it couldn't decipher, even putting it mark only mode. I'm going to see if my logic analyzer can record serial data. I also have one of those old Robot RTTY keyboards, not sure if that had a loop jack on it but I may pulling that out and see.

Jeff

On Tue, Jan 24, 2023 at 8:51 PM Daniel Jones <djones at k6yic.com<mailto:djones at k6yic.com>> wrote:
I probably should have thought about it a little more before I sent the last message.  It’s outputting a loop current it sounds like and not audio to be converted.

Don’t mind me while I go to the back of the room. Hi hi.

Daniel

www.K6YIC.com<http://www.K6YIC.com>
DJones at K6YIC.com
HH#11973

On Jan 24, 2023, at 17:37, Daniel Jones <djones at k6yic.com<mailto:djones at k6yic.com>> wrote:

Could it be SITOR by chance?

Daniel

www.K6YIC.com<http://www.K6YIC.com>
DJones at K6YIC.com
HH#11973

On Jan 24, 2023, at 17:08, Jeff G <jeffg at junknet.net<mailto:jeffg at junknet.net>> wrote:


Unfortunately the VOLPE board can't make heads or tails of it either, no matter what baud or mode I use. Either the baud rate is wrong or I dunno what. In 45 baud mode, it prints gibberish similar but not identical to what the machine prints. I may have to take it back out to the garage and fire up the logic analyzer lol. Then I can also check to see the ASCII/BAUDOT pin on the MM rom to see what mode its actually using.

Jeff

On Tue, Jan 24, 2023 at 4:56 PM <hwhall at compuserve.com<mailto:hwhall at compuserve.com>> wrote:
5815 maps to Federal Supply Classification (FSC) 5815 = Teletype and Facsimile Equipment.
Google hasn't made any sense out of the other numbers yet.

Wayne
WB4OGM

-----Original Message-----
From: Jeffrey Golas <jeffg at junknet.net<mailto:jeffg at junknet.net>>
To: Greenkeys <greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>>
Sent: Tue, Jan 24, 2023 7:40 am
Subject: [GreenKeys] Navy Teletype Message Generator

Thought you guys and gals might find this interesting...I volunteer on Battleship NJ and found this tucked away. Appears to be Navy-like but mentions "project" on it, serial #3 lol. Other than WMS on the board theres no manufacturer.

Its a RTTY/Teletype message generator that does the "quick brown fox" message. Whats really interesting is that all that is based on ONE chip whose sole purpose is exactly that. A MM5220DF. Other chips in that series have similar purposes, like ASCII-BAUDOT conversion.

Theres what looks like a white CPU, but Icant find any docs on it. It almost looks like something they had a surplus of, and with no rom, possibly wired it as a NOP (no-operation) so that it would just be an 8 bit counter. I think anyway.

It does seen to work after cleaning all the switches, I plan to test on the loop. All it does is keying via a solid state relay. I tried piping my signal gen through it but Fldigi couldnt decode.




Jeff KC3GJX

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