Codan Radio Communications VT-3-150-SN User Manual
Transmitter Main Board Instruction Manual
3-5
3.6.2 MT-3 Transmitter Board Test Points
TP1:
squelched, de-emphasized audio / +13.8 Vdc
TP2:
microphone audio
TP3:
microphone PTT WTO; inactive +9.5 Vdc, active 0 Vdc
TP4:
microphone PTT NTO; inactive +9.5 Vdc, active 0 Vdc
TP5:
+9.5 Vdc from backplane connector
TP6:
+9.5 Vdc from front panel board
TP7:
+9.5 Vdc Switched
TP8:
Qualified PTT; inactive +9.5 Vdc, active 0 Vdc: activated by synthesizer
TP9:
synthesizer enable; selected by J18
TP10: synthesizer bootstrap line; +5 Vdc
TP11: synthesizer PTT input; inactive +9.5 Vdc, active 0 Vdc
TP12: audio processor TOT input; inactive +9.5 Vdc, active 0 Vdc
TP13: audio processor TOT output; inactive +9.5 Vdc, active 0 Vdc
TP14: audio processor audio output
TP15: audio processor audio control line
TP16: audio processor subtone #2 output
TP17: audio processor direct modulation input
TP18: audio processor subtone #2 input
TP19: audio processor continuous +9.5 Vdc
TP20: audio processor subtone #1 input
TP21: audio processor supply +8 Vdc, selected by J7
TP22: audio processor tone/digital input
TP23: synthesizer receive data line; 0 Vdc
TP24: synthesizer transmit data line; +5 Vdc
TP25: Q1 collector; inactive 0 Vdc, active +9.5 Vdc
TP26: U2d output; inactive +9.5 Vdc, active 0 Vdc
TP27: U1a output (PTT WTO); inactive +9.5 Vdc, active 0 Vdc
TP28: U1b output (PTT NTO); inactive +9.5 Vdc, active 0 Vdc
TP29: Q6 collector / Q7 gate; inactive +9.5 Vdc, active 0 Vdc
TP30: +9.5 Vdc PTT Switched
TP31: U8 pin 1, Time-Out-Timer circuitry set input
TP32: U8 pin 2, Time-Out-Timer circuitry reset input
TP33: Audio processor balanced audio input
TP34: Audio processor balanced audio input
TP11: synthesizer PTT input; inactive +9.5 Vdc, active 0 Vdc
TP12: audio processor TOT input; inactive +9.5 Vdc, active 0 Vdc
TP13: audio processor TOT output; inactive +9.5 Vdc, active 0 Vdc
TP14: audio processor audio output
TP15: audio processor audio control line
TP16: audio processor subtone #2 output
TP17: audio processor direct modulation input
TP18: audio processor subtone #2 input
TP19: audio processor continuous +9.5 Vdc
TP20: audio processor subtone #1 input
TP21: audio processor supply +8 Vdc, selected by J7
TP22: audio processor tone/digital input
TP23: synthesizer receive data line; 0 Vdc
TP24: synthesizer transmit data line; +5 Vdc
TP25: Q1 collector; inactive 0 Vdc, active +9.5 Vdc
TP26: U2d output; inactive +9.5 Vdc, active 0 Vdc
TP27: U1a output (PTT WTO); inactive +9.5 Vdc, active 0 Vdc
TP28: U1b output (PTT NTO); inactive +9.5 Vdc, active 0 Vdc
TP29: Q6 collector / Q7 gate; inactive +9.5 Vdc, active 0 Vdc
TP30: +9.5 Vdc PTT Switched
TP31: U8 pin 1, Time-Out-Timer circuitry set input
TP32: U8 pin 2, Time-Out-Timer circuitry reset input
TP33: Audio processor balanced audio input
TP34: Audio processor balanced audio input
3.7
Module Installation and Removal
Installation of the Enhanced Synthesizer or Crystal Controlled Oscillator module is facilitated by
alignment pins on each corner of the module. When the four pins are aligned with their
corresponding hole in the Transmitter Main Board, push the module down, taking care to ensure the
connector pins on the bottom of the Synthesizer or Crystal Controlled Oscillator module are not
bent.
alignment pins on each corner of the module. When the four pins are aligned with their
corresponding hole in the Transmitter Main Board, push the module down, taking care to ensure the
connector pins on the bottom of the Synthesizer or Crystal Controlled Oscillator module are not
bent.