This low cost 900 MHz, ISM
band transceiver was designed for long range data
acquisition / remote monitoring applications. What makes
this design ideally suited for long range use - is the
application of a controlled power amplifier and careful
narrow band receiver design. The transceiver may be used as
a single frequency device or frequency hopping algorithms
may be employed. Either FSK or OOK modulation may be used.
Full read back of the transceiver state including lock
detect and received signal strength (RSSI) are available. An
on board PIC microprocessor handles the digital programming
chores and accepts RS232 commands in plain English.
- Part 15 compliant
- Narrow band receiver for
excellent adjacent channel interference rejection.
- Digitally controlled
power amplifier for optimized power consumption and
- Switchable LNA gains to
optimize sensitivity and dynamic range in strong signal
- When mated to a 4
element Yagi - the design is nearly interference proof in
point to point applications.
- Range over 20 miles
- 38 k Baud FSK.
- OOK (On Off Keying) mode
also possible - like Morse code - for even longer
- Full 900 MHz band
operation with 300 Hz frequency resolution.
- True, solid state
antenna switching for low loss, low distortion
- Low power consumption,
single +3 volt supply operation - ideal for solar
- Optional TCXO or for
extreme frequency accuracy.
- Environmentally rugged
design, -40 to 70 Deg C operating range, fully ESD