Major BOS 1a
Page 1: ...Major BOS 1a...
Page 2: ...ter Control 6 Connecting several Control Sets in Parallel 6 Headset 6 Tape Connection 6 External Loudspeaker 6 Jumper 7 Potentiometer 7 Board Layout 8 Calibrating the AF levels 8 Technische Daten 9 Ge...
Page 3: ...pplied 3 Carrier display squelch 4 PTT button SENDEN red for gooseneck microphone or headset 5 Call buttons for Call 1 RUF 1 1750 Hz and Call 2 RUF 2 2135 Hz PTT and tone are activated 6 Volume contro...
Page 4: ...microphone 5 PTT active GND 6 Pinout TB tape ST4 ext loudspeaker 1 ext loudspeaker GND 2 tape AF output A mod 3 tape AF output B mod 4 Pinout PTT ST3 GND 1 GND for microphone 2 AF earpiece 3 GND for e...
Page 5: ...In all cases the PTT display LED is activated Volume Settings The volume of the loudspeaker also for ext loudspeaker is set via the volume control knob The volume of the handpiece as well as the level...
Page 6: ...wiring or star wiring By decoding the PTT output in this case used as an input it is possible to mute the Major BOS 1a externally in order to avoid feedback between control sets placed adjacently to e...
Page 7: ...g permanently off JMP3a 1 2 ext PTT headset int PTT gooseneck microphone JMP3a 2 3 ext PTT headset with Headset int PTT headset without Headset int PTT gooseneck microphone JMP3a open not used JMP3b 4...
Page 8: ...or ST3 pin 3 without load vs GND c adjust P6 Tape to the desired tape level norm 500 mV at ST4 pins3 4 600 Ohm Anschluss 2 Adjustment of the AF output a connect the level meter and the radio to the AF...
Page 9: ...ting 200 ohm output impedance while receiving high resistance AF output level earpiece of headset ST2 ST3 pin 3 4 Werksseitig eingestellt auf 350 mV an 200 ohm Ausgangsimpedanz ca 100 ohm AF input lev...
Page 10: ...as not been turned off and all capacitors have been discharged Electrolytic capacitors can be still charged for a long time after turning off When using components modules devices or circuits and equi...
Page 11: ...mbos1a 06 09 2012 11 Kompetent f r Elektroniksysteme Release Notes 06 09 2012 first English version of Major BOS 1a manual...
