Miniature transmitter/receiver overcomes noise
A
RF Solutions product story
Edited by the Engineeringtalk editorial team
Aug 3, 2001
The latest miniature FM transmitter and receiver modules from RF Solutions simplify design, save space and reduce component count in applications needing reliable licence-exempt wireless links
The latest miniature FM transmitter and receiver modules from RF Solutions simplify design, save space and reduce component count in applications requiring highly reliable licence-exempt wireless links.
Ideal for portable, battery-powered designs, the QFMT6 transmitter and QFMR6 receiver are fully shielded, 'off-the-shelf' modules that will suit vehicle alarms, domestic and commercial security systems, process monitoring schemes and computer networking applications.
Particularly suited to applications operating in areas of high interference or high levels of radio traffic, the new miniature modules allow designers to quickly and easily implement data links with speeds up to 64kbps and operating distances of 200m.
The devices are supplied in shielded SIL packages and operate at the European approved frequency of 868MHz.
Based around a phase lock loop (PLL) and crystal oscillator, the QFMT6 transmitter provides an accurately controlled RF output in the frequency domain.
This allows narrow filtering at the receiver, significantly increasing the immunity to interference.
An on-board voltage regulator enhances performance from improved supply filtering while ensuring a constant RF output level.
The QFMR6 receiver is based on a single conversion superhet design that utilises a crystal-based phase lock loop (PLL) for accurate generation of the local oscillator.
This allows the use of high Q bandpass filters, resulting in good adjacent channel selectivity and high interference immunity.
Dynamic range for the receiver is rated at better than 120dB, while analogue and digital outputs simplify integration with external circuitry and microprocessors.
A built-in Received Signal Strength Indicator (RSSI) provides a DC output voltage that is proportional to the RF input signal.
Both the QFMT6 and QFMR6 are fully pin compatible with existing modules, allowing engineers to improve the performance of their applications without modifying the basic design.
Each device can operate from a 5V supply and will work at temperatures of up to 55C as standard.
The QFMR6 is also available in an extended temperature version that is rated for operation between -40 and 80C.
The QFMT6 has dimensions of 31.5 x 10 x 3.4mm, while the QFMR6 measures 49.05 x 17 x 4.5mm.
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