Functional description:
The TX2 transmitter module is a two stage, SAW controlled FM transmitter operating between 2V and
6V and is available in 433.92MHz. The TX2 module is type approved to EN 300 220-3 for European use
and delivers nominally +9dBm from a 5V supply at 12mA. The module measures 32 x 12 x 3.8 mm.
The RX2 module is a double conversion FM superhet receiver capable of handling date rates of up to
160kbps. The SIL style RX2 receiver measures 48 x 17.5 x 4.5 mm. It will operate from a supply of 3-6V
and draws 14mA when receiving. A fast-acting carrier detect and a power-up enable time of less than
1ms. This allows effective duty cycle power saving and a -107 dBm sensitivity. This combined with a
SAW front-end filter results in an excellent RF performance and EMC conformance.
TX2 transmitter:
Vcc (3)
RF out (2)
433 MHz band
pass filter
buffer
100 kHz
nd
2 order LPF
TXD (5)
+10 dBm @ 5V
433.92MHz
SAW-stabilised
oscillator
100K
RF gnd (1)
0 VOLT (4)
Fig. 1: TX2 block diagram
Pin description:
RF GND
(pin
1)
RF ground pin, internally connected to the
module screen and pin 4 (0V). This pin should
be connected to the RF return path (e.g. coax
braid, main PCB ground plane etc.)
RF out
(pin 2)
50Ω RF output to the antenna, it is DC
isolated internally. (see antenna section for
suggested antenna/feeds).
Fig.2: physical dimensions
Vcc
(pin 3)
+ve supply pin. The module will generate RF when the Vcc supply is present. Maximum ripple content
0.1V
P-P
. A 100nF de-coupling ceramic capacitor is suggested.
0V
(pin
4)
Supply ground connection, connected to pin 1 and screen.
TXD
(pin
5)
This DC coupled modulation input will accept either serial digital data ( 0V to Vcc levels) or high level
linear signals. Input impedance is 100kΩ.
Radiometrix Ltd., TX2 & RX2 Data Sheet
page 2
RADIOMETRIX [ RADIOMETRIX LTD ]
