[GreenKeys] Navy Teletype Message Generator

Wed Jan 25 18:44:39 EST 2023

You'd need to figure out how to load a different divisor into the BRG register.  I haven't followed the details that closely, but one of the questions I had was does it need to be powered down after changing setting or did it turn out to have some sort of processor?  If it's getting  the setting out of a ROM, the 45.45 stuff might be able n it but not used.

John, W9DDD

> On Jan 25, 2023, at 5:06 PM, W2HX <w2hx at w2hx.com> wrote:
> 
> Thinking about my suggestion, it would probably adversely affect the 110 baud rate which you may want to preserve. It might be possible to re-strap the uart for 45 baud if you are able to find any documentation on the chip.
>  
>  
> 73 Eugene W2HX
> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>  
> From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of W2HX
> Sent: Wednesday, January 25, 2023 4:49 PM
> To: Jeffrey Golas <jeffg at junknet.net>
> Cc: Greenkeys <greenkeys at mailman.qth.net>
> Subject: Re: [GreenKeys] Navy Teletype Message Generator
>  
> 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
>  
> <image001.jpg><image002.jpg><image003.jpg>
>  
>  
>  
> 
> On Jan 25, 2023, at 10:24 AM, W2HX <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>
> 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> 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
> DJones at K6YIC.com
> HH#11973
>  
> 
> On Jan 24, 2023, at 17:37, Daniel Jones <djones at k6yic.com> wrote:
> 
> Could it be SITOR by chance?  
>  
> Daniel
> 
> www.K6YIC.com
> DJones at K6YIC.com
> HH#11973
>  
> 
> On Jan 24, 2023, at 17:08, Jeff G <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> 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>
> To: Greenkeys <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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