Telemetry System FM 40
System Overview

V1.2 12/10/2012

Table of Contents

Table of Contents
1 Safety Instructions ............................................................................................................................................... 3
2 Restricitons for Usage ......................................................................................................................................... 4
3 System Overview ................................................................................................................................................. 54 Technical Data ...................................................................................................................................................... 6
4.1 Telemetry Unit FM 40 .................................................................................................................................................................... 6
4.2 Pit Receiver Box ................................................................................................................................................................................ 7
4.3 Pit Receiver Package ...................................................................................................................................................................... 9
4.4 Telemetry Accessories ................................................................................................................................................................. 10
5 Installation of the FM 40 Unit .......................................................................................................................... 13
5.1 Antenna ............................................................................................................................................................................................. 13
5.2 Cables ................................................................................................................................................................................................ 13
6 Configuration ..................................................................................................................................................... 14
7 Recommended Setup of the FM 40 ................................................................................................................. 15
8 Changing Parameters using the SL-commands ............................................................................................. 172 / 18

Telemetry System FM 40

Bosch MotorsportSafety Instructions | 1

1 Safety Instructions
Warning

To comply with FCC RF exposure compliance requirements, the following
separation distances must be maintained between the antenna of the devices and all persons:Device

PowerMin. Distance

FM 40

10 W

0.78 m / 31 inThis is valid for the use of the Bosch-antenna B 261 208 888-01.

Bosch Motorsport

Telemetry System FM 40

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2 | Restricitons for Usage

2 Restricitons for Usage
Bosch Telemetry Unit FM40 has been designed to operate in certain frequency
ranges in the 70 cm band.
The permitted frequencies may differ from one region or country to another. Theuser must take care that the radio is operated complying to the local regulations.

WarningUsers of FM40 radio modem in North America should be aware, that due tothe allocation of the frequency band 406.0 – 406.1 MHz for government use
only, the use of radio modem on this frequency band without a proper permit is strictly forbidden.
FCC-Certification
EC Certificate of Conformity

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Telemetry System FM 40

Bosch Motorsport

System Overview | 33 System Overview
The Bosch Motorsport Online Telemetry System enables the transmission of online measurement data from a car on a racetrack. The vehicle part of the system
consists of a data logger (C 40, C 55 or C 60) and the FM 40 telemetry transmitter. From the data logger data is sent via a RS232 connection to the FM 40. The
FM 40 adds framing and error correction information to the data stream andmodulates its RF output which is fed via an antenna wire to the TX antenna.
In the pits, the RF signal is picked up by an RX antenna connected to the pit receiver box. Inside the receiver box, the signal is filtered and amplified by a low
noise filter amplifier. It is then sent to a UHF modem. The modem demodulates
the data stream and performs error correction, if necessary. The output stream
passes the data converter and is transferred via a connection wire to the server
PC in the garage. This PC decodes the car’s telemetry stream and distributes theinformation over the pit network.
Due to the high transmission power of 1 to 10 W of the Bosch FM 40 telemetrytransmitter, near 100 % coverage is achieved on most tracks, even under race
conditions with high RF interference.

Car Antenna

Pit Antenna
Pit Receiver Box(Pit roof)

Telemetry
Transmitter FM 40

ControlModule
RS232

Bosch Motorsport

Telemetry System FM 40

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4 | Technical Data

4 Technical Data
4.1 Telemetry Unit FM 40

The FM 40 is a half-duplex radio modem suitable for real-time telemetry transmission from a car on the racetrack.
The unit is offered in different hardware versions for several frequency bands inthe 430 to 470 MHz range. Within the selected band, the transmission frequency
is software programmable in a ±1 MHz range. The high RF output power of up
to 10 W gives excellent range and good track coverage.
From the data acquisition system transmit data is fed into the FM 40 via a RS232
interface. Typically the FM 40 is operated as an unidirectional telemetry transmitter. For other applications, half duplex bidirectional operation is also possible.
International standard

I-ETS 300 220, ETS 300 113, FCC

Mechanical DataSize

151 x 138 x 28 mm

Weight720 g

Housing with LED indicators
Car antenna compatible to existing Bosch telemetry systems.
Max. vibration

60 m/s2 at 20 Hz to 2 kHz

Electrical Data
Half duplex radio modem (bidirectional)Internal data buffer and protocol management
Frequency range

430 to 470 MHz (hardware adjustable)F(center) ± 1 MHz (software programmable)

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Telemetry System FM 40

Bosch MotorsportTechnical Data | 4Transmission power

1 to 10 W

Receiver sensitivity-116 dBm error detection and forward
error correction (FEC)

RF channel bandwidth

12,5 kHz at 9.6 kbps
25 kHz at 19.2 kbps

Data interface

RS232

Data rate

9.6 / 19.2 kbps

Required power supply

10 to 18 V

Max. power consumption

25 W at 14 V

Max. current< 2,5 A

Operation temperature range

0 to 60°CConnectors and Wires
RFBNC female

Power / data

CGK SOT 8N35 PN

4.2 Pit Receiver Box

The Pit Receiver Box integrates all electronic components necessary to receive
telemetry data from a car equipped with a FM 40 transmitter in one weatherproof package. Typically the receiver box is mounted on the pit roof as close as
possible to the RX antenna, thus minimizing cable loss. The connection wire tothe receiving PC in the garage, which can be up to 50 m long, also supplies power to the Pit Receiver Box.
The Pit Receiver Box contains 1 to 4 UHF receivers fed by a single RX antenna
and low noise filter amplifier (LNA). This enables parallel telemetry data reception
from up to 4 cars, provided transmitters need to operate in the same 2 MHz frequency band.
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Telemetry System FM 40

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4 | Technical Data

The Box is equipped with dual Ethernet port for redundant Ethernet wire to thepit or for connection to a directional link (relay station).

Mechanical Data
Weight4.2 kgSize

330 x 280 x 180 mm

Max. distance receiver box to PC (with F 50 m020 V01 440-01
Working temperature range-20 to 50°C

Electrical Data
Frequency range

400 to 470 MHz

Working frequency bandfc ±1 MHzChannel spacing

12.5/25 kHzSensitivity≤ -116 dBm at BER 10-3

Serial interface

RS232 (19.2 kBit/s, no parity, 8 data bit,
1 stop bit, no flow control)

Radio data rate

19.2 kbps (25 kHz channel)
9.6 kbps (12.5 kHz channel)

Operating voltage

20 to 50 V

Communication

2 x 10 / 100 Mbit ethernet

Power consumption

10 W

Connectors and Wires
Data and power connector

Motorsports type

Antenna connector

BNC (Jack) 50 Ω

Package PartsBox
48 V power supply8 / 18

Telemetry System FM 40

Bosch MotorsportTechnical Data | 4Splitter

LNAUHF Modem 1

UHF Modem 2

UHF Modem 3

UHF Modem 4
Ethernet
Interface

Connector toRelay
Directional Link
Ethernet #1

Power Supply
ModuleConnector toTelemetry Server
Power Supply
Ethernet #2

Connector to
AntennaFig. 1: Scheme Pit Receiver Box

4.3 Pit Receiver Package+ Eth

The Pit Receiver Package contains everything that is required to start operation.
Bosch Motorsport

Telemetry System FM 40

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4 | Technical DataPackage Parts
Pit Receiver Box (2 channels)

F 02U V01 460-01

HF antenna wire (8 m)

B 261 209 493

Rod antenna pit 7 dbi (2 m)

B 261 208 867

Ethernet and power wire (50 m)

F 020 V01 440-01

Ethernet and power injection wire (1.5m)

B 261 209 744-01

Telescopic aerial mast (7.7 m)

B 261 208 873

4.4 Telemetry Accessories
4.4.1 FM 40 Tester

The FM 40 Tester is used to check the performance of telemetry components installed in the car which includes the FM 40 in conjunction with the RF wire andthe antenna. The FM 40 tester indicates RF output power as well as defective RFwires or car antennas enabling quick detection of faulty components.

Electrical Data
Transmission power

1 to 15 (60) WVSWR

1 to 6Frequency band

VHF / UHFConnectors and Wires
RF10 / 18

BNC male / female

Telemetry System FM 40

Bosch MotorsportTechnical Data | 4

4.4.2 Telemetry Antenna Dummy Load

The telemetry antenna dummy load replaces the telemetry car antenna whenrunning the FM 40 transmitter in the workshop or the garage. It reduces highpower RF radiation.

Electrical Data
RF power

15 W

VSWR

1.1

Frequency band

VHF / UHF

Connectors and Wires
RFBNC male / female

4.4.3 Telemetry Car Antenna

Rugged telemetry antenna for car mounting.
Frequency bandUHFType¼λPattern (hor.)omni

Length

150 mmConnectors and Wires
RFBosch Motorsport

BNC male

Telemetry System FM 40

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4 | Technical Data

4.4.4 Antenna Cable Kit

RF wire for the installation of telemetry antennas in the car. Intended for single
hole mounting.
LengthMax. 2m (tbd.)

Drill hole diameter

12,5 mm

Attenuation

Max. 0.7 dB at 2 m, 450 MHz

Connectors and Wires
RF12 / 18

BNC male / female

Telemetry System FM 40

Bosch MotorsportInstallation of the FM 40 Unit | 5

5 Installation of the FM 40 Unit
Warning

The FM 40 unit has to be mounted on shock absorbing material (e.g. foamrubber).
Please do not allow a vibration level greater then 6 g for proper function.
Do not install the unit near the engine (temperature and vibration may
cause damage or malfunction).
The FM 40 unit needs airflow for cooling.

5.1 Antenna
Mount the antenna as high as possible in vertical position for optimum radiation.
Keep distance to all vertical conductive materials having a length of more than
25 cm (10").
Mounting the antenna on a conductive plane (RF-ground plane) ensures goodradiation. However, mounting on carbon fibre materials also works good if themounting hole is closely fit to the coax-BNC-socket (antenna attachment). This is
for the conductive carbon fibre to get contact to the outer conductor of the coax
plug, which is RF-ground. An enhancement is possible using copper or aluminium foil sticked under the carbon having contact to the outer conductor of theplug (diameter >15 cm (6") around the antenna socket).

5.2 Cables
Keep all RF-cables as short as possible to reduce losses in transmit power. As reference value, the length of all coax cables from modem output to antenna shallnot exceed 2 m (80").

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Telemetry System FM 40

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6 | Configuration

6 Configuration
All FM40 devices are configured the same way by using a terminal program (e.g.
Windows HyperTerminal), connected to the FM40 via RS232.
The RS232 interface is set up as follows: 9600 bit/s, 8-bit data, no parity, 1 stopbit (Data rate for configuration is always 9600 bit/s, even if a different transmission data rate is configured).
By changing the switch (configuration cable B 261 209 430 or controller B 261
208 871) to progmode the settings menu is entered. Now the user can makechanges: by typing the number of the menu item, submenus are displayed.

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Telemetry System FM 40

Bosch Motorsport

Recommended Setup of the FM 40 | 7

7 Recommended Setup of the FM 40
Item

CommentStandard setting1) Radio frequency The frequency channel is set by typing ***.**** <RETURN>

Centre frequency (fc)
430 - 470 MHz by orThe entered numbers are not echoed, dercheck the frequency displayed after
hiding the return key.

81 Channels in the interval fc +/- 1.0 MHz
If the frequency typed in is out of the by user selectablechannel grid, the FM 40 automatically Channel spacing
selects the closest possible frequency. 0.025 MHz
Between two operated transmitters thetime keeps 0.050 MHz
minimum separation.
Rx Threshold –115
dBm,
Tx Start Delay 0 ms3) Addressing

Could be used when operating more Rx address OFF,
than one transmitter on the same
Tx address OFFchannel, do not use for race car telemetry4) Serial Port 1

Setup the RS232 interface.

ON, 19,200 Bit/s,
8 bit Data, no Parity 1
Stop bit5) Serial Port 2

Not usedOFF6) Handshaking

Handshaking settings of the RS232
interface

CTS Line Property:
Clear to send
CD Line Property: Data on channel
RTS Line Property: Ignored

7) Additional Set- Error-correction orup
error-detection
coding for RF-link,repeater-function(FM 40 will repeat
all incoming messages), enable SLcommands, set priority function8) Routing

Bosch Motorsport

Error correction ONError CheckOFFRepeaterOFFSL-Commands

On if needed, elseOFFPriority

TX

FM 40 repeats data on the same
OFFchannel but with different addressing,
do not use.

Telemetry System FM 40

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7 | Recommended Setup of the FM 40

Item

CommentStandard setting9) Tests

Several test modes for hardware
checksOFFA) Factory Setup

Reset all settings to factory standard Do not selectE) Exit and save

Save settings and return to normaloperation(after release of the progmodeswitch)Q) Quit without
save

Cancel all changes and return to normal operation(after release of the progmodeswitch)▪ STORE the changes by pressing “e”▪ CANCEL the changes by pressing “q”
After setting the switch back to data mode the FM40 is ready to receive or transmit data.

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Telemetry System FM 40

Bosch MotorsportChanging Parameters using the SL-commands | 8

8 Changing Parameters using the SLcommands
If the SL-command function has been activated active radio channel and addresses can be changed without switching the radio modem into configuration
mode.

Warning

Make sure, that if SL-commands are activated, the data stream does notcontend any bit stream being identical to a SL-command. Unwanted changeof a parameter would be the result.
Command

Effect and Description of Command

SL&F=nnn.nnnn

Set frequency to nnn.nnnn MHz

SL&+=nnSet frequency nn channels above center frequency
Frequency=Center frequency+nn*Channel spacing, where
nn=[0…Number of channels/2]

SL&-=nnSet frequency nn channels below center frequency
Frequency=Center frequency-nn*Channel spacing, where
nn=[0…Number of channels/2]

SL**>

Bosch Motorsport

Save current settings as permanent settings

Telemetry System FM 40

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Contact
Europe:Bosch Engineering GmbHMotorsport
Robert-Bosch-Allee 174232 AbstattGermany
Tel. +49 7062 911 79101
Fax +49 7062 911 79104
North and South America:
Bosch Engineering North America
Motorsports
38000 Hills Tech Drive
Farmington Hills, MI 48331-3417
United States of America
Tel. +1 248 876 2977
Fax +1 248 876 7373
Asia Pacific:
Bosch Engineering K.K.
Motorsport Department
18F Queen’s Tower C, 2-3-5 Minato Mirai
Nishi-ku, Yokohama-shi
Kanagawa 220-6218
Japan
Tel. +81 45 650 5610
Fax +81 45 650 5611
E-Mail: motorsport@bosch.com
www.bosch-motorsport.com
Status: 10 December 2012
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All rights such as copying and forwarding through us.
Modifications reserved.