[GreenKeys] WTD Teletype 403103 EIA to 60ma loop interface

[paul cembura]

 You probably know by now but  J1 is RS232C and TB1 -1 is transmit +, TB1-2 is transmit -, TB1-3 is receive +TB!-4 is receive-Hope this helpsmr rtty

    On Saturday, January 24, 2026 at 11:47:56 AM PST, Nick England via GreenKeys <greenkeys at mailman.qth.net> wrote:  
 
 Does anyone have one of these little black boxes with a built-in loop supply?
Or a copy of Specification 50998S or the applicable Schematic Diagram (WD)?

Cheers,
Nick England K4NYW
www.navy-radio.com
Nick England K4NYW
Chapel Hill NC
www.navy-radio.com
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