[GreenKeys] Info wanted - Frederick Electronics 1309 Universal Line Isolation Relay

[Nick England]

Info wanted - Frederick Electronics 1309 Universal Line Isolation Relay
This 1U rack mount gadget has 4 channels, each with input +/- terminals,
and output mark-common-space terminals.

Each input has an EIA-HI LEVEL switch, Polar on-off switch, and Bias pot,
so I guess it'll handle most any signal. It appears the output is just
transistor switches from MK and SP to Common.

Each of 4 PC boards has jumper locations (empty now) labeled 20ma and 60ma
but I don't know what they are for unless they change input loop sensing?
The PC boards are labeled Polar H.L. Keyer Type N0327B

There is an on-board +/- 12v supply that just runs to terminals on the rear
- don't know why....

Any info on this device would be greatly appreciated.

Thanks
Nick England K4NYW
www.navy-radio.com
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