NRX0 Datasheet, PDF (2/8 Pages) Radiometrix Ltd – 27MHz HF Narrow Band FM TX & RX

Functional description
The NTX0 transmitter consists of a Frequency Modulated (FM) Voltage Controlled Crystal Oscillator (VCXO)
feeding a two stage amplifier and RF filter. Operation can be controlled by the EN (Enable) line, the
transmitter achieving full RF output typically within 5ms of this line being pulled high. The RF output is
filtered to ensure compliance with the appropriate radio regulations and fed to the 50Ωantenna pin.
The NRX0 module is a double conversion NBFM superhet receiver capable of handling data rates of up to
5kbps. It will operate from a supply of 2.9V to 15V and draws 12mA when receiving. A signal strength (RSSI)
output with greater than 60dB of range is provided. The SIL style NRX0 measures 47 x 17 x 8 mm excluding
the pins.
NTX0 Transmitter
43mm
32mm
8mm
15mm
NTX0
15.24mm (0.6")
123
4 5 ₆₇
7 holes of 0.7mm dia.
pin spacing 2.54mm (0.1")
Figure 2: NTX0 pin-out and dimension
1 = RF gnd
2 = RF out
3 = RF gnd
4 = En
5 = Vcc
6 = 0V
7 = TXD
User interface
NTX0 pin Name
Function
1, 3
RFGND
RF ground is internally connected to the module screen and pin 6 (0V).
These pins should be directly connected to the RF return path - e.g. coax
braid, main PCB ground plane etc.
2
RF out
50Ω RF output to the antenna
4
EN
Pull high to enable Transmitter (3V CMOS logic)
5
Vcc
2.9 – 15V DC power supply
6
0V
Ground
7
Notes:
TXD
DC coupled input (3V CMOS logic). R_in = 100kΩ
1. EN must not be left floating
2. Pinout footprint is as NTX2. (Like a TX1, but pcb is longer)
3. Compatible with LMR0 and NRX0.
4. TXD is actually a linear input, with self bias to 1.5V
5. 27.095MHz is the default channel.
Radiometrix Ltd.,
NTX0/NRX0 data sheet
Page 2