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RXA15101E
Single
Channel, 151MHz Analog Receiver
Features
• 1 analog channel which is 4-20mA with 10 bit accuracy.
• 1 digital channel which is a normally open contact.
• 12 way dip switch to set transmitter and receiver ID.
Applications
• Monitoring storage tank levels.
• Remote temperature and humidity monitoring.
• Monitoring flow rates, industrial equipment and machinery.
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 Download Datasheet
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Description
The RXA15101E is an analog and digital 151 MHz receiver. The analog signal, normally 4-20mA is received from the transmitters (TXA15101E) analog input. Also, the normally open digital contact can be simultaneously received with the analog signal. This eliminates the high cost of wiring and has the flexibility of wireless data collection.
Using 151MHz has superior penetration in congested industrial environments with steel construction. Higher frequencies such as 433MHz or 915MHz tend to reflect of metal and make wireless data collection difficult.
The on board 12-way dip switch sets the ID for the receiver. This has to be matched to the 12-way dip switch on the transmitter for a secure transmission.
No case version is also available - RXA15101
The RXA15101 receiver is the PCB assembly only, while the RAX15101E receiver is enclosed in a UBB plastic case with an external supply connection and SO239 antenna socket.
Signal Strength Indicator
The 151MHz receivers have five blue LED’s on the board. The table below indicates the level of the valid transmitted signal.
5 LED’s on |
-70dBm |
Very Strong signal |
Very Reliable operating conditions |
4 LED’s on |
-75dBm |
Very Strong signal |
Very Reliable operating conditions |
3 LED’s on |
-80dBm |
Very Strong signal |
Very Reliable operating conditions |
2 LED’s on |
-90dBm |
Strong signal |
Very Reliable operating conditions |
1 LED on |
-100dBm |
Good signal |
Reliable operating conditions |
Noise Strength Indicator
If more than 1 led is “ON” without a valid transmission, this indicates that there is noise on the frequency selected. Change the 3-way dipswitch on the receiver module to select a different frequency. The default setting is for 151.6MHz (All 3 dipswitches “ON”). Below is a table with the Dipswitch settings and the frequencies.
Frequency |
1 |
2 |
3 |
151.600 MHz |
On |
On |
On |
152.375 MHz |
Off |
On |
On |
151.775 MHz |
On |
Off |
On |
151.400 MHz |
Off |
Off |
On |
151.175MHz |
On |
On |
Off |
151.025 MHz |
Off |
On |
Off |
150.900 MHz |
On |
Off |
Off |
150.825 MHz |
Off |
Off |
Off |
Technical Data
| Supply Voltage |
12.0 – 24.0 Volts DC |
| Current Consumption |
36mA - standby
91mA – Analog Output 20mA and Relay ON |
| Receiver Type |
Single Conversion Superhetrodyne |
| Receiving Frequency |
151.6MHz (8 selectable frequencies. See table above). |
| Output |
4-20mA analog and Normally open contact. |
| Oscillation System |
VCO with 10ppm crystal controlled reference oscillator |
| Operating Temperature |
-5 to 50°C |
| IF Frequency |
10.7MHz |
| Sensitivity |
Better than 0.5uV (For signal reception) |
| Selectivity |
Better than -6dB at +/-25kHz |
| Type of Demodulation |
Narrow Bandwidth Frequency Modulation |
| Occupied Bandwidth |
25kHz at -20dB |
| Maximum Load on Current Loop |
350Ω with 12V supply
600Ω with 24V supply |
| Dimensions |
95 X 70 X20mm |
| Mounting hole size |
3.97 mm or 5/32" |
| Weight |
83g |
| Useable Transmitters |
TXA15101E or TXA15101 |
| Antenna |
50Ω 151 MHz Antenna or piece of wire approximately 1m long |
Block Diagram
*If no signal is received for 2min 20sec (or 23.3 minutes if Mode Switch 1 is ON) then analog output goes to maximum (20mA) and relay switches OFF. (Mode added June 2008)
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