am transmitter module mkt1 - xxx version 3.0 page 1 of 4 am or fm lo w power radio modules for 100 to 1000 mhz designers and manufactueres of quality transmitters, receivers and transceivers features miniature two pin package saw resonator 100% am modulation data rates up to 2400 bits/s optimal range 100m (433.92 mhz version) 315 / 318 / 433.92 / 868.35 & 916.5 mhz versions cmos/ttl compatible input low current consumption (typ. 5ma) single s upply voltage 1.5 C 13v applications vehicle alarm systems remote gate controls garage door openers domestic and commercial security compatible receiver modules mkr1 - xxx (see data sheet mkr1) mkr2am - xxx (data sheet mkr2am) mkr5a - xxx (highest spec am receiver) general description the mkt1 - xxx miniature transmitter uhf radio module enables the implementation of a simple telemetry link at data rates of up to 2400 bit/s when used with one of the compatible mk receiver modules. available for operation at all world frequencies these modules are able to transmit at distances of up to 100m. the mkt1 - xxx module will suit one - to - one and multi - node wireless links in applications including building and car security and remote con trol applications. because of its small size and low power requirements, the module is ideal for use in portable battery powered wireless applications.
am transmitter module mkt1 - xxx version 3.0 page 2 of 4 am or fm low power radio modules for 100 to 1000 mhz designers and manufactueres of quality transmitters, receivers and transceivers absolute maximum ratings: transmitter operating temperature: - 20 c to +55 c storage temperature: - 40 c to +85 c supply voltage (pin 1) 15v data input (pin 1) 15v electrical characteristics: transmitter pin min. typ. max. units notes dc levels supply voltage 1.5 5.0 13 volts current & rf power for supply 7 to 13 volts : - supply current @ rd = 1.0k (data high) 6 8.2 9 ma rf power into 50 @ rd = 1k 2 4 6 dbm 433mhz for supply 1.5 to 3.7 volts: - supply current @ rd = 51 (data high) 4 7 ma rf power into 50 @ rd = 51 - 4 0 dbm 433 hz note, above values apply to all frequencies rf & data data rate @ rf<500 mhz 100 2400 bits/s
am transmitter module mkt1 - xxx version 3.0 page 3 of 4 am or fm low power radio modules for 100 to 1000 mhz designers and manufactueres of quality transmitters, receivers and transceivers connection details figure 1: mkt1 transmitter application information antenna design the desi gn and positioning of the antenna is as crucial as the module performance itself in achieving a good wireless system range. the following will assist the designer in maximising system performance. the antenna should be kept as far away from sources of el ectrical interference as physically possible. if necessary, additional power line decoupling capacitors should be placed close to the module. the antenna hot end should be kept clear of any objects, especially any metal as this can severely restrict th e efficiency of the antenna to transmit power. any earth planes restricting the radiation path to the antenna will also have the same effect. best range is achieved with either a straight piece of wire, rod or pcb track @ ? wavelength (15.5cm @ 433.92mh z). further range may be achieved if the ? wave antenna is placed perpendicular in the middle of a solid earth plane measuring at least 16cm radius. in this case, the antenna should be connected to the module via some 50 ohm characteristic impedance coax . pin description data (pin 1) cmos/ttl compatible input. must be driven with appropriate current limiting resistor to provide the module with 5ma. gnd (pin2) ground connection, preferably connected to a solid ground plane. general information the m kt1 - xxx requires a current limiting resistor (rd) to source the module with the correct drive current. the following values of rd can be used with the module depending on the drive voltage: drive voltage = 1.5 C 3.7v then rd = 51 to 300 drive voltage = 7 C 13 v then rd = 1k0 typical figure 2: drive circuit required for mkt1 transmitter module figure 3: antenna configurations to be used with the mkt1 transmitter module mkt1 transmitter 1 2 component side antenna 220pf rd mkt1 1 2 drive current drive voltage signal from encoder pin 2 pin 1 c1 loop antenna area 600mm 2 pin 1 c1 = 2.2pf @ 418mhz c1 = 1pf @ 433mhz 15.5cm @ 433mhz loop antenna whip antenna
am transmitter module mkt1 - xxx version 3.0 page 4 of 4 am or fm low power radio modules for 100 to 1000 mhz designers and manufactueres of quality transmitters, receivers and transceivers mechanical dimensions figure 4: mkt1 transmitter ordering information standard product; part no description mkt1 - 434 am two pin transmitter 433.92mhz mkt1 - 868 am two pin transmitter 868.35 mhz mkt1 - 916 am two pin transmitter 916.5 mhz plea se consult our sales department for further information. m.k.consultants (uk) ltd 288a - 290 quenns road halifax west yorkshire hx1 4ns england tel +44 (0) 1422 329002 fax +44 (0) 1422 353153 email: admin@mkconsultants. eu web www. mkconsultants.eu disclaimer mkconsultants have a policy to continually improve the reliability and performance of their products. we therefore reserve th e right to upgrade o ur products performance without notice. although the data contained herewidth is believed to be accurate, however we do not assume any responsibility whatsoever for errors or omissions this document may contain. in addition, we do not imply warranty or fit ness for any particular application especially life support applications. mkt1 transmitter 1 2 10mm 14mm 3.5mm 5.08mm
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