Radiometrix Ltd
TR2M Data Sheet
page 3
59mm
3.1mm
8.9 mm
A
C
B
1
1
53.3mm
Unit height
10mm
A: 1 Vcc
A: 2 Gnd
B: 1 RF Gnd
B: 2 RF in
B: 3 RF Gnd
C: 1
C: 2 TXD (MOD NC)
C: 3 AF in (MOD NC)
C: 4 RSSI
C: 5 SQF (MOD NC)
C: 6 AF out
C: 7 RXD (MOD NC)
C: 8 +4.4V out
C: 9 0V
C: 10 PGM
C: 11 P1 (MOD TXD)
C: 12 P2 (MOD RXD)
C: 13 P3 (MOD NC)
TXE (MOD TX_ON)
Squelch adj.
Input gain.
Pin Description - TR2M
Pins
Name
Function
A1
Vcc
4.5V-16V
A2
GND
Ground
B1
RF GND
RF ground
B2
RF
To the antenna
B3
RF GND
RF ground
C1
TXE (MOD TX_ON)
Transmitter Enable. Low = ON, Open = RX mode. Internal 10kΩ pull-up to 4V
C2
TXD (MOD NC)
DC coupled digital data input for 3-12V CMOS logic. Leave open if unused
C3
AF in (MOD NC)
AC coupled Analogue Input Limit to 1Vpk-pk ±10% to keep distortion <1.5% and
peak deviation >2.5kHz
C4
RSSI
DC level between 0.5V and 2.5V. 60dB dynamic range
C5
SQF (MOD NC)
Noise operated carrier detect. Open collector. ON/low = no signal
C6
AF out
200mVpk-pk audio. DC coupled, approx 1V bias. Muted by squelch
C7
RXD (MOD NC)
Open collector output of data slicer suitable for Biphase codes
C8
+4.4V out
Regulated DC supply. 75mA max. drain. Present if unit is powered
C9
0V
Ground
C10
PGM
Serial programming/configuration input at RS232 level
C11
P1 (MOD TXD)
C12
P2 (MOD RXD)
C13
P3 (MOD NC)
Parallel frequency select inputs. Inverted logic, internal 10kΩ pullups to 4V
Notes:
1. TR2M receiver section inverts the sense of the baseband stream, so a logical inversion is present
between input of TX and output of RX. A version is available (TR2I) which inverts the transmit
datastream as well (resulting in no net inversions between a pair of TR2I radios).
2. Carrier detect on TR2M mutes the AF Out and RXD outputs. It can be factory disabled.
3. All the open collector outputs must be connected to Vcc/+4.4V out via a pull-up resistor.
4. The software incorporates a 1200baud dumb modem, compatible with that implemented in
TX2M, RX2M radios (I1200 tones and format)
5. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3
lines are used for modem input/output operations.
6. PGM and MOD TXD (pin 10 and 11) tolerate true ±RS232 levels. No buffering is required.
Figure 3: TR2M Footprint (Top)
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