KJ6VU repeater and remote base controller
Here are the prototype boards...
CPU Board
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CPU
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Supports 4 radios
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32 inputs, 16 outputs, to control 4 radio interface boards. The CPU
takes in DTMF decoder, COR and PL inputs from each radio interface board.
The outputs are PTT, Tx audio mute and something else I forgot.
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One IDC jumper bridges to the audio mixer hub board and provides the switching
control for the audio paths.
Radio Interface Board
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Optional CPU - only used in distrubuted processing mode
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Audio in/out buffers, tx audio mute control, squelch audio gate, Micor
squelch (7716) chip, dial tone generator, MX-Comm MX-465 PL encoder/decoder,
8870 DTMF decoder and level set op amp.
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The radio board provides all buffering
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One 10 pin IDC jumper bridges to the audio mixer hub board.
Audio Hub Board
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Top half of the board is a completely programmable 4x4 audio switching
matrix controlled by a 16 bit shift register programmed by the CPU board
to select any receivers to any transmitters.
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The bottom half was an afterthought to add an ISD audio record/playback
module.
Power Supply Board
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Top half of the board...
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+12 volts in from power suppy or battery
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+5v and +10v out to all the boards.
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Bottom half of the board...
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Extra CPU for diagnostic testing such as audio sweeping a receiver.
