At the risk of moving the thread off in a different direction. I
noticed the 50 vs. 45.45 also and it cause me to wonder if the
Navy towards the end of their use of mechanical printers moved
towards all 50 baud and dropped 45.45. NATO and all that?
--- ---- You said "tomorrow" yesterday. The above comments or recommendations are SWAG. Use at your own risk. John, W9DDD
Maybe try adjusting your range finder? Front panel says 50 baud not 45 baud?
Sent from Nine
From: Jeff G <[email protected]>
Sent: Tuesday, January 24, 2023 9:26 PM
To: Daniel Jones
Cc: [email protected]
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 <[email protected]> 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
On Jan 24, 2023, at 17:37, Daniel Jones <[email protected]> wrote:
Could it be SITOR by chance?
Daniel
On Jan 24, 2023, at 17:08, Jeff G <[email protected]> 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 <[email protected]> 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.
WayneWB4OGM
-----Original Message-----
From: Jeffrey Golas <[email protected]>
To: Greenkeys <[email protected]>
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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