[GreenKeys] Mystery RTTY Project

[Ralph Mowery]

Seems that the Arduino could be coded to do that and have the 31 ms stop bit.  Most any speed could be set and the cr/lf added after a set number of characters.  

Ralph ku4pt


-----Original Message-----
From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of B. Smith
Sent: Saturday, July 08, 2023 6:20 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Mystery RTTY Project

Several have figured out the project. The RY's are generated by sending a square wave using a 555. The 555 then drives an HSR series optical switch which keys the local loop. Dovetron does a similar operation with their RY generator. There are plenty of Chink 555 boards on ePay that are all ready built and cost is around 2 bucks.
Photo Attached.
K4CHE
http://k4che.com/Tempvideo/RTTY%20Mystery%20Project/Mystery%20K4CHE.mp4