Hopping Randomly pseudo declaration letter

FCC ID: H5OTR75

Cover Letter(s)

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FCCID_4470278

天利合企業股份有限公司 ADVANCE SECURITY INC. 211新北市汐止區大安街48號3樓 3F, 48 TA AN STREET HSI-CHIH DIST. NEW TAIPEI CITY221, Taiwan (R.O.C.) Tel：+886-2-8648-1688 Fax：+886-2-8648-1689 Product name: Car alarm 2 way main unit Product model: 75SL FCC ID: H5OTR75 Table for Carrier Frequencies Channel Frequency(MHZ) Channel Frequency(MHZ) 01 908.300 14 916.040 02 908.895 15 916.635 03 909.490 16 917.233 04 910.085 17 917.825 05 910.680 18 918.422 06 911.277 19 919.612 07 911.872 20 920.805 08 912.467 21 921.400 09 913.063 22 921.995 10 913.658 23 922.590 11 914.255 24 923.188 12 914.850 25 923.783 13 915.444 --- --- Hooping Sequence 08、16、22、04、12、19、01、09、17、06、14、20、03、11、24、07、15、21、02、10、 18、05、13、25、23

Coordination of hopping sequences to other transmitters This transmitter does not have the ability of being coordinated with other FHSS system for as soon as the transmitter is in operation, the hopping frequency will follow the selected hopping sequence to transmit independently and no coordination is possible. Especially, this transmitter is used as a duplex car alarm system, so no coordination of hopping frequency is required. System Receiver Hopping Capability There are two steps to make the receiver to shift the frequencies in synchronization with the transmitted signals: First, the Transmitter will emit a preamble signal of 50ms and the receiver will scan this signal by 2ms sweeping until the preamble signal is caught. Second, the preamble signal is coded with the information of hopping sequence and the next transmitting frequency, so the receiver will be able to shift the receiving frequencies in synchronization with the transmitted signals. Equal Hopping Frequency Use Due to each hopping frequency will be transmitted in accordance to the frequency tables described above, there is no any frequency will be able to hop more times than others. Therefore each frequency will be used equally. Michael Chen / Contact person Address: 3F, 48 TA AN STREET HSI-CHIH DIST. NEW TAIPEI CITY221, Taiwan (R.O.C.)


Document Created: 2019-10-03 14:42:19
Document Modified: 2019-10-03 14:42:19
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