By M. Scott Zimmerman N3XCC
Disable the signaling in a Spectra TAC commercial Voting Receiver for use in a non-commercial installation. Also describe the common receiver connection points on the unit for direct connection to other radio equipment. I.E. a link radio or repeater controller.
The Motorola Spectra TAC voting receiver is a compact single chassis receiver solution for remote voting applications. It was intended to be used with wire line interconnects between the voting receiver and the voting panel.
Since the system was designed for wire interconnects, or constant key radio
links; all telemetry (S/N ratio, COS active, etc.) was transferred by using
tones and/or DC voltages. For most amateur applications dedicated phone lines
are cost prohibitive and full time radio links don't allow for efficient
use of available spectrum.
The following signals are available from the Spectra TAC receiver:
|Signal Name||Module Name
||Un-squelched, Un-filtered Discriminator Audio.
Direct from Discriminator
|Buffer Disc. Audio2
||Buffered, Un-squelched, Un-filtered Discriminator
|Amp. Disc. Audio3
||Amplified, DC Biased, Un-squelched, Un-filtered
||De-Emphasized, PL filtered audio. Fed through a
22K series resistor. (see below)
||Ground When Squelched, Open when Un-squelched.
May require a pull-up resistor.
||16 & 21
||Each pin is a separate source of 13.8v when correct
tone is decoded or disable switch is activated.
PL/DPL Decode module must be installed.
Copyright 7-14-2005 M. Scott Zimmerman, N3XCC
This information was compiled by M. Scott Zimmerman, N3XCC 7-14-2005
Page last updated by N3XCC 7-14-2005
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