[MRCA] [MMRCG] Fast RTTY

[Nick England]

On the other hand this might be the impetus for me to run some control
lines from the transmitter/receiver room to the main teletype room where I
have some 100wpm machinery. I do have four TTY lines run but nothing else
yet.
That means trusting that the transmitter doesn’t catch on fire while I’m in
the other room.
Or maybe I need to recruit an ET to monitor the transmitter while I play
RM........

Cheers
Nick

*From:* MMRCG at groups.io <MMRCG at groups.io> *On Behalf Of *Ray Fantini
> *Sent:* Friday, February 12, 2021 3:25 PM
> *To:* 'MRCA' <mrca at mailman.qth.net>; MMRCG at groups.io
> *Subject:* [MMRCG] Fast RTTY
>
>
>
> Plowing forward on my 1980 digital RTTY project, going to be building the
> input UART that will convert the digital level output of the Dovetron TU
> this weekend. That will provide me with a five bit word that the ROM board
> will convert to a seven bit ASCII word that the MX Tactical terminal will
> understand.
>
> The MX family of terminals run at 75, 600 and 2400 baud. I have the UART
> that co the seven bit word to a serial word the MX understands and sends it
> to the MX at a blinding high speed rate of 75 baud. The real problem will
> be going from the MX to the Dovetron at 60 WPM, going from 60 WPM (45.5
> baud) up to 100 WPM (75 baud) is no issue. The problem occurs with the way
> the MX Terminal works. You cannot transmit in real time. You have to write
> to a buffer in the terminal and then go to the SEND function on the
> terminal and dump the entire message at once. When going from 75 baud to
> 45.5 baud you would have to store data in the message to make up for the
> added time required to clear the data thru the UART.
>
> Long story short, wont have any issues reading 60 WPM traffic on the
> terminal but looks like I can only transmit if both stations are running at
> 100 WPM
>
> What’s the feeling about getting some of the 28 people out there to get
> those old teleprinters to chug along at that speed?
>
>
>
> Ray F/KA3EKH
>
>
>
>
>
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> --
Nick England K4NYW
www.navy-radio.com
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