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T15105
151.600MHz, 100mw Radio Data Transmitter
Features
• Transmits FSK digital data
• Baud rates 40 - 4800bps
• Long range - 5km
• Low cost, small size, low current consumption
Applications
• Telecommand Systems
• Security Systems
• Alarms
• Radio Data Communications
• Commercial / Industrial Telemetry
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Description
The T15105 is a radio data transmitter to transmit FSK digital data. Baud rates of 40 to 4800 bps can be transmitted to an operating range of 5 Kilometres in line of sight. The low cost, small size, wide operating voltage combined with low current consumption makes it ideal for various applications.
There are 7 selectable frequencies available. This is achieved by setting the 3-way dipswitch. 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
| Power Source |
4.5 - 5.5 VDC Absolute maximum 6.5VDC. |
| Current Consumption |
80mA when enabled,( transmitting)
Less than 1uA when disabled. |
| Enable Voltage/Current |
5V MAX, 50uA. |
| Operating Frequency |
151.6MHz (8 selectable frequencies. See table above) |
| Oscillation System |
VCO with 10ppm Crystal Controlled reference Oscillator |
| Operating Temperature Range |
-5 to 50°C |
| RF Power Output |
100mW into 50 ohms. |
| Data Input Level |
Data should swing close to ground and +5 volts |
| Baud Rate |
40 - 4800bps |
| Antenna |
Any 151MHz, 50 ohms Antenna |
| Type of Emission |
Narrow-band-width Frequency Modulation. |
| Frequency Deviation |
+/- 5kHz. |
| Harmonics |
Less than -40dBm (100nW) |
| Weight |
8 grams |
| Compatible Receiver |
R15105 |
Dimensions
T15105 Data Format
It is important to input the correct data format otherwise the receiver will have a lower sensitivity which will result in a reduced transmission range.
The R15105 receiver data slicer is set for 50/50-duty cycle, therefore the “data in” should have a 50/50-duty cycle. The 50/50-duty cycle data can be pulse-width modulated to transmit resets, 0's or 1's. See diagram below :
A 50/50-duty cycle will have an average DC signal resulting in a constant reference for the data slicer. Users should use pulse-width modulation to transmit data with logic 1's or 0's.
If a different duty cycle is used, for example 66/33 ( Manchester format) the data slicer in the receiver will try to adjust itself to the average DC signal. Since this average DC signal is changing with different data bits this will result in a constantly changing reference for the data slicer, resulting in lower sensitivity. See diagram below :
Only 50/50 duty cycle data is suitable for the T15105 transmitter and R15105 receiver.
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