EW
N
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Issue 1, 01 November 2007
BiM1H
VHF Narrow Band FM 500mW transceiver
The BiM1H transceiver modules offer a
500mW RF output VHF data link in
Radiometrix transceiver standard pin-out
and footprint. This makes the BiM1H
ideally
suited
to
those
low
power
applications where existing wideband
transceivers provide insufficient range.
Features
•
•
•
•
•
•
•
Standard frequency 151.300MHz band
Other frequencies from 120MHz to 180MHz
Data rates of up to 3kbps for standard module
Usable range over 10km
Fully screened
Feature-rich interface (RSSI, analogue and digital baseband)
Low power requirements
Figure 1: BiM1H-151.300-3
The BiM1H is a half duplex radio transceiver module for use in long range bi-directional data transfer
applications at ranges up to 10kilometres.
Applications
•
•
•
•
•
•
•
•
•
Tracing and asset tracking systems
Meter reading systems
Industrial telemetry and telecommand
Data loggers
In-building environmental monitoring and control
Social alarms
High-end security and fire alarms
DGPS systems
Vehicle data up/download
Technical Summary
•
•
•
•
•
•
•
Size: 33 x 23 x 12mm
Operating frequency: 151.300MHz
Supply range: +5V regulated supply
Current consumption: 290mA transmit, 8mA receive
Data bit rate: 3kbps max. (standard module)
RSSI output with >60dBm range
-120dBm sensitivity (for 12 dB SINAD)
Radiometrix Ltd.,
BiM1H transceiver data sheet
Page 1
BiM1H transceiver contains a 500mW BiM1HT transmitter circuit and BiM1R receiver circuit with
their RF output and input connected to a common RF pin via an internal RF switch.
Radiometrix Ltd.,
BiM1H transceiver data sheet
Figure 2: BiM1H block diagram
Page 2
Functional description
The transmit section of the BiM1H consists of a frequency modulated Voltage Controlled Crystal
Oscillator (VCXO) feeding a frequency doubler with two stage amplifier and RF filter. Final Power
Amplifier stage is factory pre-set to appropriate band power level. A Tx Select line controls the
operation; the transmitter achieves full RF output typically within 8ms of this line being pulled low.
The RF output is filtered to ensure compliance with the appropriate radio regulations and fed via a fast
Tx/Rx changeover switch to the 50Ω antenna pin.
The receive section is a double conversion FM superhet with IF at 21.4MHz and 455kHz fed by a Low
Noise Amplifier (LNA) on the RF front-end. The receiver is controlled by RX Select line and will power
up typically <2ms. Quadrature detector output is available as Audio Frequency (AF) output and
transmitted digital data is regenerated from AF using adaptive data slicer. A Received Signal Strength
Indicator (RSSI) output with some 60dB of range is provided.
User interface
side view (through can)
side view (with can)
12 mm
top view (without can)
RF GND 1
Antenna 2
RF GND 3
4
5
No pin
6
7
8
9
30.48 mm
33 mm
pin pitch: 2.54 mm
pins 4, 5, 6, 7 & 8 are not fitted
recommended PCB hole size: 1.2 mm
module footprint size: 25 x 32 mm
18
17
16
15
14
13
12
11
10
GND
Vcc
RX SELECT
TX SELECT
23 mm
TXD
AF
RXD
RSSI
GND
Figure 4: BiM1H pin-out and dimension
BiM1H Pin
1, 3
2
17
16
15
14
13
12
11
9, 10, 18
NOTES:
1. RX SELECT and TX SELECT have internal (10kΩ approx.) pull-up to Vcc
2. Avoid RX SELECT and TX SELECT both low: undefined module operation (but damage will not result)
3. A regulated +5v rail must be used
4. Pin out is as standard BiM1 and BiM2. On RF connector end only pins 1, 2, 3, 9 are present.
Name
RF GND
RF IN/OUT
VCC
RX SELECT
TX SELECT
TXD
AF
RXD
RSSI
0V
Function
RF ground pin, internally connected to the module screen and pin
5, 9, 10, 18 (0 Volt).
50Ω RF input/output from the antenna
+5V regulated DC power supply
Pull low to enable Receiver
Pull low to enable Transmitter
DC coupled input for 5V CMOS logic. R
in
= 100kΩ
500mV
pk-pk
audio. DC coupled, approx 0.8V bias
2.5V
pk-pk
logic output of data slicer. Suitable for Biphase codes
DC level between 0.5V and 2.4V. 60dB dynamic range
Supply ground connection
Radiometrix Ltd.,
BiM1H transceiver data sheet
Page 3
Absolute maximum ratings
Exceeding the values given below may cause permanent damage to the module.
Operating temperature
Storage temperature
RF in (pin 1)
All other pins
-10°C to +60°C
-30°C to +70°C
±50V @ <10MHz, +13dBm @ >10MHz
-0.3V to +16.0V
Performance specifications:
(Vcc = 5V / temperature = 20
°
C unless stated)
General
DC supply
Supply voltage
TX Supply current
RX Supply current
Antenna pin impedance
RF centre frequency
Channel spacing
Number of channels
Transmitter
RF
RF power output
Spurious emissions
Adjacent channel TX power (500mW)
Frequency accuracy
FM deviation (peak)
Baseband
Modulation type
Modulation bandwidth @ -3dB
TXD input level (logic low)
TXD input level (logic high)
Dynamic timing
TX select to full RF
General
Receiver
RF/IF
RF sensitivity @ 12dB SINAD
RF sensitivity @ 1ppm BER
RSSI threshold
RSSI range
Blocking
Image and other Spurious emission
Adjacent channel
LO re-radiated
Baseband
Baseband bandwidth @ -3dB
AF level
DC offset on AF out
Distortion on recovered AF
Dynamic timing
Power up with signal present
Power up to valid RSSI
Power up to stable AF output
Power up to stable RXD output
Radiometrix Ltd.,
pin
17
17
17
2
min.
typ.
5.0
290
8
50
151.300
25
1
max.
units
V
mA
mA
Ω
MHz
kHz
notes
2
2
+26
-2.5
±2.5
0
+27
-37
0
±3.0
FSK
+28
-36
+2.5
±3.5
2.5
dBm
dBm
dBm
kHz
kHz
kHz
V
V
ms
1
2
3
8
4
4
14
14
0
5
8
pin
2, 13
2, 12
2, 11
2, 11
2
2
2
min.
typ.
-120
-115
-127
60
88
-70
-70
-60
5
500
0.8
5
max.
units
dBm
dBm
dBm
dB
dB
dBm
dBm
dBm
kHz
mV
P-P
V
%
notes
5
5
13
13
13
12
6
16, 11
16, 13
16, 12
BiM1H transceiver data sheet
TBD
2
10
ms
ms
Page 4
Signal applied with supply on
Signal to valid AF
Signal to stable data
Time between data transitions
Mark : space ratio
2, 11
2, 12
12
12
20
TBD
TBD
50
0.3
80
ms
ms
ms
%
7
7
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
Measured into 50Ω resistive load.
Total over full supply and temperature range.
With 0V – 5.0V modulation input.
To achieve specified FM deviation.
See applications information for further details.
For received signal with
±3kHz
FM deviation.
For 50:50 mark to space ratio (i.e. squarewave).
A Wide bandwidth (0-5kHz) version, which supports 10kbps data rate, is also available as special.
Radiometrix Ltd.,
BiM1H transceiver data sheet
Page 5
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