[GreenKeys] Plantronic, Frederick 1280A

[Steve Rohrer]

Bob,

The connector strips are unlabeled, as a modulator or demodulator card may 
be associated with either connector.

Modulator Connections:
1 - High level input (-)
2 - High level input (+)
3 - N.C.
4 - N.C.
5 - Mark freq. out
6 - Space freq. out
7 - Low level input (188C in)
8 - N.C.
9  - Balanced output (fsk)
10 - Balanced output (fsk)
11 - Ground (188C)
12 - Ground

Demod Connections:
1 - N.C.
2 - N.C.
3 - Data Mid-Bit Sample (rx/tx clock)
4 - N.C
5 - Undetected Mark
6 - Undetected Space
7 - Data Out RS-232-C
8 - Data Out MIL-188-C
9 - Balanced audio input (fsk)
10 - Balanced audio input (fsk)
11 - Ground (data return)
12 - Ground (clock return)

To determine what sort of card you have behind the connector, you gotta pop 
the top and look inside.  Some recently sold 1280's come with two demod 
cards.

73s,
Steve KA4RSZ

----- Original Message ----- 
From: "Rdelgatto" <rdelgatt at optonline.net>
To: <greenkeys at mailman.qth.net>
Sent: Monday, February 13, 2006 20:54
Subject: [GreenKeys] Plantronic, Frederick 1280A


>
> Hello Group,
> I recently picked up a 1280A in very clean and lights up condition.
> Of course the manufacturer didn't label the connection strips in the
> rear of the unit (2 strips 1-12) and I would hate to smoke the unit.
> Would anyone have the pin outs or links to info on this terminal or
> best yet a manual for sale or copy. Also any opinions on this good or bad?
> Thanks, 73s
> Bob Del Gatto, KC2LTX
>
>
> NNNN
>
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