[GreenKeys] 28ASR with sync magnet

[Nick England]

I dug up the wiring diagrams for the 28ASR with sync pulse magnet.
https://www.navy-radio.com/manuals/tty/wd/UGC6K-LESU111-wd.pdf

It turns out to be easy to get it to do what we want...
You can ALWAYS ENABLE the sync pulse magnet to run off the internal 120vdc
supply.
Then the K-KT-T switch will disable the magnet in T mode so that the
perf/reperf can be driven off the keyboard without the keyboard
transmitting.

Ref: Note 15 on the actual WD and note 8 on the schematic WD

Check that the following jumpers are in place
C125-C142-C22 (-120v)
C124-C131-C21 (+120v)

Connect a 2000 ohm 10w resistor between C126 and C125 (this limits the
magnet current to 50ma)

Move the magnet hold-down lever out of the way.
It works!



[image: image.png]

[image: image.png]


Have Fun!
Nick England K4NYW
www.navy-radio.com
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