HX1

VHF Narrow Band FM High Power (300mW) Transmitter

The special HX1 transmitter modules offer a 300mW RF output VHF data link in Radiometrix SIL standard pin-out and footprint. This makes the HX1 ideally suited to those low power applications where existing narrow band and wideband transmitters provide insufficient range. Together with the matching RX1 or BiM1R receiver a one-way radio data link can be achieved over a distance up to 10km+ with suitable choice of data rate and antennas.

Figure 1: HX1-169.4125-3-5V

Features

* Standard frequency:169MHz band
* Other frequencies from 120MHz to 180MHz
* Data rates up to 3kbps for standard module
* Usable range over 10km
* Fully screened
* Low power requirements

The HX1 is a narrow band radio transmitter module for use in long range data transfer applications at ranges up to 10kilometres. HX1 transmitter circuit is the BiM1T transmitter circuit in the TX1 pin-out with slightly enlarged dimension to accommodate extra Power Amplifier circuit to produce 300mW RF output and available for operation on 169MHz European licence exempt frequency band.

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

* Transmit power: 300mW (24.7dBm) nominal
* Operating frequency: 169.4125MHz, 169.5625MHz
* Supply range: 5V regulated
* Current consumption: 140mA nominal transmit
* Data bit rate: 3kbps max.
* Size: 43 x 15 x 5mm

Evaluation Platform: Universal Evaluation kit or Narrow Band Evaluation Kit
Matching Receiver: NRX1-169.4125-10 or RX1-169.4125-10 or CVR1-169.4125-10

User interface


Figure 2: HX1 pin-out and dimension

HX1 pin Name Function
1, 3 RF GND RF Ground
2 RF out 50Ω RF output to the antenna
4 EN Pull high to enable Transmitter
5 Vcc 5V regulated supply
6 0V Ground
7 TXD DC coupled input for 5V CMOS logic. Rin = 100R

Note: Pinout and footprint as TX1. (but PCB is longer)

Performance specifications

Absoule maximum ratings
Operating temperature: -10°C to +60°C
Storage temperature: -30°C to +70°C

(Vcc = 5.0V / temperature = 20°C unless stated)

General pin min. typ. max. units notes
DC supply
Supply voltage
4
-
5
-
V
TX Supply current
4
-
140
-
mA
RF
RF power output
2
+23.7
+24.7
+25.7
dBm
1
Spurious emissions
2
-
-40
-
dBm
Adja. channel TX power
-37
dBm
2
Frequency accuracy
- 2.5
0
+2.5
kHz
3
FM deviation (peak)
±2.5
±3.0
±3.5
kHz
4
RF centre frequency
-
169.4125
-
MHz
5
-
169.5625
-
MHz
5
Channel spacing
-
25
-
kHz
Number of channels
1
Antenna pin impedance
2
-
50
-
Ω
Baseband
Modulation bandwidth @ -3dB
0
-
3
kHz
6
Modulation distortion (THD)
TBA
%
TXD input level (logic low)
6
-
0
-
V
7
TXD input level (logic high)
6
-
5.0
-
V
7
Dynamic timing
TX select to full RF
-
5
-
ms

Notes:
1. Measured into 50Ω resistive load
2. For 1kbps Manchester encoded; the data bit rate is limited to 3kbps NRZ max. to meet adjacent channel power specification.
3. Total over full supply and temperature range
4. With 0V - 5.0V modulation input
5. Other VHF 120-180MHz by special order
6. 5V CMOS compatible
7. To achieve specified FM deviation

Limitation of liability

The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may be subject to radio interference and may not function as intended if interference is present. We do NOT recommend their use for life critical applications.
The Intrastat commodity code for all our modules is: 8542 6000.

R&TTE Directive

After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment.
Further details are available on The Office of Communications (Ofcom) web site:
Licensing policy manual