TX433 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
TX433 Datasheet PDF : 8 Pages
| |||
THE TX433
The TX433 wireless RF transmitter uses on/off keying to transmit data to the
matching receiver, RX433. The data input “keys” the saw resonator in the
transmitter when the input is +3 volts or greater, AM modulating the data
onto the 433 MHz carrier. The data is then demodulated by the receiver,
which accurately reproduces the original data. The data input is CMOS level
compatible when the unit is run on +5 volts.
When driving with a CMOS input, there must be enough level to achieve at
least 3V on the data input, 5V is preferable. This is due to the start-up time
of the oscillator needing to be fast to accurately reproduce your data. If the
voltage is too low, the oscillator will not start fast enough to accurately
reproduce your data, especially at higher data rates. Luckily not much drive
is needed, so this should be easy since it is 22K ohms of load. Almost any
CMOS output will drive this without any problems. There are some CMOS
outputs which have very little drive capability which may not work, so testing
the voltage at the data input may be a wise choice if you are having
problems.
ANTENNA CONSIDERATIONS:
The simplest antenna consists of a piece of wire approximately 6 to 7 inches
long. If you desire more range you can try a ground plane antenna or a
Yagi such as the Ramsey 400-4 model. The antenna should be tuned for
the 433 MHz band for best operation.
Having two Yagi antennas, one for the transmitter and one for the receiver
will allow you to extend the range considerably, but since they are
directional, this would be best for if your receiver and transmitter are in fixed
positions.
PROJECT IDEAS:
Use the RX/RX pair to transmit RS232 data at rates up to 2400 baud, send
statistical PC data from remote computers to display terminals. Also use to
send weather data from one point to another. Use with some more circuitry
to relay remote control data wirelessly (see the RR1 and RRW1 kits we
offer). Use for additional control on remote control vehicles and rockets.
TX433 • 3
Share Link: 