[GreenKeys] Navy Teletype Message Generator

[W2HX]

I bet you can change the crystal on that board and get 45 baud out of it.


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

From: Jeffrey Golas <jeffg at junknet.net>
Sent: Wednesday, January 25, 2023 1:38 PM
To: W2HX <w2hx at w2hx.com>
Cc: Daniel Jones <djones at k6yic.com>; Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] Navy Teletype Message Generator

Yeah I hooked it up to a 5v loop and logic analyzer last night, and sure enough 50 baud is EXACTLY 50 baud. It sends baudot for the first two and ASCII for 110 baud. Seems like it works!

Attaching pics for fun and profit.

Jeff KC3GJX

[cid:image001.jpg at 01D930DC.E96C0850][cid:image002.jpg at 01D930DC.E96C0850][cid:image003.jpg at 01D930DC.E96C0850]




On Jan 25, 2023, at 10:24 AM, W2HX <w2hx at w2hx.com<mailto:w2hx at w2hx.com>> wrote:

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

Sent from Nine

________________________________
From: Jeff G <jeffg at junknet.net<mailto:jeffg at junknet.net>>
Sent: Tuesday, January 24, 2023 9:26 PM
To: Daniel Jones
Cc: greenkeys at mailman.qth.net<mailto: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<mailto: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<mailto: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

______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net<mailto:GreenKeys at mailman.qth.net>

>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net<http://www.qsl.net/>
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to hwhall at compuserve.com<mailto:hwhall at compuserve.com>
______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net<mailto:GreenKeys at mailman.qth.net>


Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to djones at k6yic.com<mailto:djones at k6yic.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230125/741c8399/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 117897 bytes
Desc: image001.jpg
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230125/741c8399/attachment-0003.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 100762 bytes
Desc: image002.jpg
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230125/741c8399/attachment-0004.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 88538 bytes
Desc: image003.jpg
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230125/741c8399/attachment-0005.jpg>