QM Receiver Module
QMR1 Details
QMR1 / QMR2
General Information
Antenna
Mixer
RF
AMP
Band Pass
Filter
IF
AMP
Low Pass
Filter
Detector
QMR1
Phase
Lock
Loop
1
2
3
4
5
6
7
Figure 2: Receiver Block Diagram
The receiver module is a quasi AM /FM (QM)
superhet receiver capable of handling data rates
of up to 10Kbits/s. With an on board data buffer
and phase locked loop a –110 dBm sensitivity is
achieved.
Figure 1: QMR1 Receiver
Pin Description:
Vcc ( PIN 1 )
+Ve supply pin. Operation from a 5V supply able
to source 2mA at less than 10mV
P-P
ripple.
GND ( PIN 2 )
Supply ground connection, preferably connected
to a solid ground plane.
RF IN ( PIN 3 )
50Ω RF input from antenna, connect using
shortest possible route. Capacitively isolated from
internal circuit.
UNCONNECTED ( PINS 4 & 5 )
Extra SIL pins for additional mechanical retention.
RSSI ( PIN 6 )
Test output providing a voltage that is proportional
to the level of the RF input on pin 3.
DATA OUT ( PIN 7 )
CMOS compatible output. This may be used to
drive external decoders.
Note:
sink/source
capability is limited to 20µA.
Utilising the quasi AM/FM modulation technique
and the latest phase locked loop receiver
technology with one of the compatible transmitter
modules will yield a highly efficient wireless link.
Note:
Because of the way Quasi Modulation
operates the QMR1 and the QFMT1 will not work
reliably in close proximity to each other.
RSSI Values
RF Level (dBm) pin 3
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
RSSI (volts) pin 6
2.12
2.21
2.31
2.46
2.62
2.80
2.91
2.97
3.00
3.03
2.88
Ds302_3
AUG 01
©
2001 REG No 277 4001 England
Page 3
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