DE
DANIELS
ELECTRONICS
3-4
MT-3 AM Transmitter Main Board Instruction Manual
3 . 6 . 2
MT-3 AM Transmitter Board Test Points
TP1:
not used
TP2:
microphone audio
TP3:
microphone PTT WTO; in9.5 Vdc, active 0 Vdc
TP4:
microphone PTT NTO; in9.5 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; in9.5 Vdc, active 0 Vdc: activated by synthesizer
TP9:
synthesizer enable; selected by J18
TP10:
synthesizer bootstrap line; +5 Vdc
TP11:
synthesizer PTT input; in9.5 Vdc, active 0 Vdc
TP12:
audio processor TOT input; in9.5 Vdc, active 0 Vdc
TP13:
audio processor TOT output; in9.5 Vdc, active 0 Vdc
TP14:
audio processor audio output
TP15:
not used
TP16:
not used
TP17:
not used
TP18:
not used
TP19:
audio processor cont9.5 Vdc
TP20:
not used
TP21:
audio processor 8 Vdc, selected by J7
TP22:
not used
TP23:
synthesizer receive data line; 0 Vdc
TP24:
synthesizer transmit data line; +5 Vdc
TP25:
Q1 collector; inactive 0 Vdc, 9.5 Vdc
TP26:
U2d output; in9.5 Vdc, active 0 Vdc
TP27:
U1a output (PTT WTO); in9.5 Vdc, active 0 Vdc
TP28:
U1b output (PTT NTO); in9.5 Vdc, active 0 Vdc
TP29:
Q6 collector / Q7 gate; in9.5 Vdc, active 0 Vdc
TP31:
+9.5 Vdc TOT SET
TP32:
+9.5 Vdc TOT RESET
TP33:
+9.5 Vdc BALANCED INPUT
TP34:
+9.5 Vdc BALANCED 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.
