KTX2
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The KTX2 is a miniature PCB mounting code-hopping UHF radio transmitter suitable for use in secure remote keyless control applications at distances up to 75 metres in-building or 300 metres open ground. Features ■ Designed for compliance with EN 300 220-3 and EN 301 489-3 ■ Each transmitter module is pre-programmed and unique ■ No additional circuitry required to use the module ■ 32-bit encryption - more than 4 billion combinations ■ Usable range up to 300m ■ Available at 433.92MHz ■ Fully screened module ■ Suitable for use with a Radiometrix KRX receiver-decoder The module combines full screening with extensive internal filtering for EMC - minimising spurious radiations and susceptibilities. The KTX2 module will suit wireless control links in applications including car and building security and secure unidirectional remote process control. Because of the small size and low power requirement the module is ideal for use in portable, battery-powered devices such as hand-held remote controls requiring data integrity and high security. Technical Summary ■ Crystal-locked PLL ■ FM data with Manchester encoding ■ Operation from 3V to 6V ■ +3dBm output on 433.92MHz ■ <1 uA standby, 8mA Tx current ■ Supply status included in transmission Radiometrix Ltd, KTX2 Data Sheet page

Functional and operational description The KTX2 transmitter module is a crystal based PLL controlled FM code-hopping transmitter with a preprogrammed Electronic Serial Number (ESN), operating between 3V and 6V supply, at 433.92MHz. KTX2 is designed to meet or exceed EN 300 220-3 standards for European use and delivers nominally +3dBm at 8mA (for 5V supply). The module measures 36.2 x 15.2 x 4.5 mm. The module is very easy to use: there are no modulation input or transmitter-enable pins. The activation of any combination of the four function lines (S0 - S3) causes a data transmission, part...

The Module will transmit if any of the function lines (S0 – S3) is activated (high). Single message time is typically 150ms. Whilst S0 – S3 are all deactivated (low) standby current consumption is <1uA. The Module will transmit the same message (with the same hop-code) repeatedly whilst any of the function lines are held active high, until power-saving time-out occurs after approx. 30s. When the power-saving timeout occurs, current consumption will be <350uA, until all function line(s) are released again. Whilst a function line is held high, if another function line is taken high then the...

Absolute maximum ratings Survival Maximums: Exceeding the values given below may cause permanent damage to the module. Operating temperature -Storage temperature Vcc (pin 4) Function input (pins 5-8) RF out (pin 1) DC LEVELS supply voltage CURRENT & RF POWER KTX2-433 supply current @ Vcc = 5V RF power @ Vcc = 3 - 6V Standby current RF harmonics < 1GHz harmonics > 1GHz initial frequency accuracy overall frequency accuracy FM deviation (+/-) 1. Measured into a 50Q load. 3. Operational at 2.8V but with reduced deviation (typ. +/-15kHz) Radiometrix Ltd, KTX2 Data Sheet page 4

Power supply requirement The KTX2 module incorporates a built-in regulator which delivers a constant 2.8V supply to the RF circuitry when the external supply voltage is 2.85V or greater, with 40dB or more of supply ripple rejection. This ensures constant performance up to the maximum permitted supply rail and removes the need for external supply decoupling except in cases where the supply rail is extremely poor (ripple/noise content >0.1Vp-p). Note, however, that for supply voltages lower than 2.85V the regulator is effectively inoperative and supply ripple rejection is considerably...

Three types of integral antenna are recommended and approved for use with the module: 0.5 mm enameled copper wire close wound on 3.2 mm diameter former 433 MHz = 24 turns Feed point 15% to 25% of total loop length track width = 1mm 4 to 10 cm inside area o RF C. Whip antenna wire, rod, PCB-track or a combination of these three 433 MHz = 16.4 cm total from RF pin. Feature ABC helical loop whip Ultimate performance ** * *** Easy of design set-up ** * *** Size *** ** * Immunity proximity effects ** *** * Range open ground to similar antenna...

Duty Cycle requirements The duty cycle is defined as the ratio, expressed as a percentage, of the maximum transmitter “on” time on one or more carrier frequencies, relative to a one hour period. Where an acknowledgement message is required, the additional transmitter “on” time shall be included. There is a 10% duty cycle restriction on 433.050-434.790 MHz band in most of the EU member states. The KTX2-433 is a RF module intended to be incorporated into a wide variety of applications and finished products, Radiometrix has no control over the end use of the KTX2-433.The harmonised band...

Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for...