FunkTronic Major BOS 1a User manual

Major BOS 1a

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This manual is valid from serial number: 008/06 PCB Nr.: MBOS1a2
Table of Contents
Abbreviations 2
Control Elements 3
Sockets Pinout Major BOS 1a 4
Rearview of Major BOS 1a 4
Major BOS 1a - General Remarks 5
Talking to the Radio 5
Volume Settings 5
Muting of the Loudspeaker 5
Tone Call Encoder 5
Transmitter 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
General Safety Information 10
Returning of Old Equipment 10
Release Notes 11
Abbreviations
HS HeadSet
BOS Authorities and organizations concerned with public safety
(German: Behörden und Organisationen mit Sicherheitsaufgaben)
TB Tape (German: TonBand)
S/E Radio circuit (German: Sende/Empfangs-Einheit)
PTT Push To Talk
GND GrouND
AF AudioFrequency
ST SockeT
Page

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Control Elements
12 3
4
5
6
10
9
1 - PTT Display LED
2 - Operation LED is on if working current is applied
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 control of the loudspeaker
7 - Loudspeaker
8 - PTT button of the handpiece
9 - Handpiece
8
7
Major BOS 1a is also available without the buttons Call 1 and Call 2.

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Rearview of Major BOS 1a
ST4, TB (tape, ext. speaker)
ST1, S/E (radio circuit)
ST3, PTT (e.g. foot switch)
ST2, HS (headset)
POWER, 12 VDC, max. 1.5 A,
inside: positive pole, outside: GND
Pinout S/E (radio circuit)
ST1
AF input B 1
AF input A 2
squelch input 3
GND 4
output: +12 V, max. 300 mA 5
PTT in/output 6
AF output A 7
AF output B 8
Pinout HS
ST2
GND 1
AF microphone 2
AF earpiece 3
GND (for earpiece) 4
GND (for 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 earpiece) 4
AF microphone 5
PTT, active GND 6
Sockets Pinout Major BOS 1a
All schemes show the sockets viewed from the back of the Major.
All AF in/outputs are equipped with transformers
and hence potential-free. PIN 5 (+12V) is for supply
of external devices (LIM-AC, FT634C, FT633AC,
FT630).
Attention: Do not use PIN 5 to supply a radio
set. 300 mA output current is not sufficient.
The AF outputs A-B are equipped with transformers
and hence potential-free.

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Major BOS 1a - General Remarks
The Major BOS 1a is a µC-based control set for radios allowing the adjustment of different levels and
parameters. The radio is connected to the squelch input, the PTT output and the AF in/output. For
operation 12 V DC supply is necessary.
As the AF output is only open during transmission, several Major BOS 1a can be connected in parallel.
The PTT output can also be used as an input for muting in order to avoid feedback between control
sets placed adjacently to each other.
Talking to the Radio
There are three different ways to talk to a connected radio:
1. by pressing the red PTT button and using the gooseneck or a headset microphone for
voice transmission
2. by using the handpiece and its PTT button
3. by using an external PTT button (e.g. foot switch) for talking via headset or gooseneck
microphone
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 of its microphone can be adjusted at the handpiece.
The potentiometers are situated near the respective capsules.
The microphone levels for the headset and the gooseneck microphone can be set internally.
Muting of the Loudspeaker
The loudspeaker is always muted automatically during transmission. When the handpiece is taken,
the loudspeaker is muted if jumper JMP3b (4-6) is pulled out.
The loudspeaker can also be muted by an external PTT output in order to avoid feedback between
control sets placed adjacently to each other.
The polarity is set by JMP2b (4-6) and has to be the same as for the PTT output JMP2a (1-3). If no
muting is desired, JMP2b must be removed.
Tone Call Encoder
The Major BOS 1a has two single tone encoders, Call 1 (1750 Hz) and Call 2 (2135 Hz). The calls
are sent using the respective buttons of the control panel. The tone call is sent as long as the button
is pressed.

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Transmitter Control
The transmitter is switched on with one of the PTT or Call buttons as long as it is pressed. The PTT
output can switch to GND as well as to 12 V. Via the open collector output several control sets can
be connected in parallel.
Connecting several Control Sets in Parallel
As the NF output is only active during transmission and the NF input can be switched to high-resistance,
the connection of several control sets in parallel is possible. Therefor, RJ45 patch sockets can be
used (bus 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 each other.
Headset
An external headset with a suitable foot switch can be connected to one of the 6-pin Western
sockets.
The sockets' pinout differs only in the polarity of the electret microphone's bias voltage in order to
provide the two frequently used pin assignments for headsets with 4/6-pin Western plugs.
Tape Connection
For voice recording a tape recorder can be connected to socket ST4. The output level can be set
internally.
External Loudspeaker
An external loudspeaker can be connected to ST4. The volume is set with the main volume control
knob.

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Jumper
Jumper Pos. Function
JMP1a 1-2 input impedance AF input 200 ohm, ST1 pin1-2
JMP1a 2-3 input impedance AF input 200 ohm, ST1 pin1-2
JMP1a open input impedance AF input high-resistance, ST1 pin1-2
JMP1b 4-5 squelch input + 5..12 volt, ST1 pin3
JMP1b 5-6 squelch input GND, ST1 pin3
JMP1b open squelch input not active
JMP2a 1-2 PTT output switches to +12 V, ST1 pin6
JMP2a 2-3 PTT output switches to GND, ST1 pin6
JMP2a open PTT output permanently inactive
JMP2b 4-5 PTT input to +12 V, ST1 pin6
JMP2b 5-6 PTT input to GND, muting off, ST1 pin6
JMP2b open PTT input inactive, muting 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 4-5 loudspeaker switched off when handpiece is taken
JMP3b 5-6 loudspeaker remains active when handpiece is taken
JMP3b open loudspeaker switched off when handpiece is taken
JMP4a 1-2 max. volume unlimited (2,0 W)
JMP4a 2-3 max. volume limited (1,5 W)
JMP4a offen max. volume limited (1,5 W)
JMP4b 4-5 min. volume always present
JMP4b 5-6 min. volume off
JMP4b offen min. volume always present
Potentiometer
Poti Function/Level
P1 AF input sensitivity ST1, pin 1-2
P2 AF output total volume ST1, pin 7-8
P3 sensitivity gooseneck microphone
P4 sensitivity headset microphone
P5 volume poti front plate
P6 NF output level tape ST4, pin 3-4

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ST4 ST1 ST3 ST2
POWER
ST6A ST7A ST5A
JMP3a
JMP3b
JMP1a
JMP1b
JMP2a
JMP2b
P6 P2
P1
P3 P4
ST8
1
4
1
4
1
4
Board Layout
Calibrating the AF levels
The AF levels are calibrated correctly ex factory. If a recalibration is necessary please follow the
steps below.
1) Adjustment of the AF input:
a) apply the AF-level specified by the radio (e.g. 500 mV) at 1000 Hz to the AF input
(ST1/pin1+2)
b) adjust P1 to approx. 530 mV at ST5A/pin1 or ST2/pin 3 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 output. The desired level (e.g.
520 mV at 200 ohm) is the level of the nominal stroke demanded by the radio
b) press button for call 1 (1750 Hz) and adjust desired level with P2
c) adjust the desired level of the gooseneck microphone using P3 while talking
normally into it
d) adjust the desired level of the headset using P4 while talking normally into it
e) adjust the desired level of the handset using the poti near the microphone while
talking normally into it
P5
ST6B
13 JMP4a
4 6 JMP4b

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Technische Daten
Operating voltage +12VDC -15% +25%
Current consumption max. 1200 mA, typ. 500 mA
AF input level (ST1, pin 1-2)
nominal 500 mV at 200 ohm
adjustment range using poti P1 250 - 1000 mV
input impedance 200 ohm, 600 ohm oder 10 kohm, ex factory: 200 ohm
AF output level (ST1, pin 7-8)
ex factory 500 mV an 200 ohm
adjustment range 150 - 630 mV an 200 ohm
200 - 1000 mV an 600 ohm
output impedance while transmitting 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 level (microphone of headset) (ST2+ST3, pin 1-2)
nominal 4 mV
adjustment range (using poti P4) 2 - 11 mV
input impedance 700 ohm
AF output level of ext. loudspeaker (ST4, pin 1-2)
output impedance 4-8 Ohm
AF intensity max. 2 watt at 4 ohm
Af output level of tape (ST4, pin 3-4)
ex factory 500 mV at 600 ohm
adjustment range 150 - 800 mV at 600 ohm
output impedance 600 ohm
Weight approx. 1400 g
Dimensions
width x depth x height 245 x 220 x 90 mm, without gooseneck microphone

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Please read the operating instructions carefully before installation and setup.
The relevant regulations must be complied to when working with 230V line voltage, two-wire-
lines, four-wire-lines and ISDN-lines. It is also very important to comply to the regulations
and safety instructions of working with radio installations.
Please comply to the following safety rules:
- All components may only be mounted and maintained when power is off.
- The modules may only be activated if they are built in a housing and are scoop-proof.
- Devices which are operated with external voltage - especially mains voltage - may only
be opened when they have been disconnected from the voltage source or mains.
- All connecting cables of the electronic devices must be checked for damage regularly
and must be exchanged if damaged.
- Absolutely comply to the regular inspections required by law according to VDE 0701
and 0702 for line-operated devices.
- Tools must not be used near or directly at concealed or visible power lines and conductor
paths and also not at and in devices using external voltage – especially mains voltage -
as long as the power supply voltage has 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 equipment the threshold
values of voltage, current and power consumption specified in the technical data must
absolutely be complied to. Exceeding these threshold values (even if only briefly) can
lead to significant damage.
- The devices, components or circuits described in this manual are only adapted for the
specified usage. If you are not sure about the purpose of the product, please ask your
specialized dealer.
- The installation and setup have to be carried out by professional personnel.
Returning of Old Equipment
According to German law concerning electronic devices old devices cannot be disposed off
as regular waste. Our devices are classified for commercial use only. According to § 11 of
our general terms of payment and delivery, as of November 2005, the purchasers or users
are obliged to return old equipment produced by us free of cost. FunkTronic GmbH will
dispose of this old equipment at its own expense according to regulations.
Please send old equipment for disposal to: FunkTronic GmbH
Breitwiesenstraße 4
36381 Schlüchtern
GERMANY
>>> Important hint: freight forward deliveries cannot be accepted by us.
February 2nd , 2006
Subject to change, Errors excepted
General Safety Information

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Release Notes
- 06.09.2012 first English version of Major BOS 1a manual