Computime Limited CT-EM2603 ユーザーズマニュアル
15.0 RF Frequency Detail
The following table shows the RF channels as defined by the IEEE 802.15.4 standard.
RF channel Frequency
11
2405MHz
12
2410MHz
13
2415MHz
14
2420MHz
15
2425MHz
16
2430MHz
17
2435MHz
18
2440MHz
19
2445MHz
20
2450MHz
21
2455MHz
22
2460MHz
23
2465MHz
24
2470MHz
25
2475MHz
26
2480MHz
The output power level can be configured in the range -32 to 5 dBm. The RF transceiver
uses direct sequence spread spectrum (DSSS) with 2 Mchip/s chip rate, giving a raw data
rate of 250 kbit/s. The modulation format is Offset – Quadrature Phase Shift Keying
(O-QPSK). It is robust even under noisy environments when sharing the same frequency
band with other applications.
The use of RF frequencies and maximum allowed RF power should according to different
national regulations. The CT-260 is complying with the applicable regulations for the world
wide 2.4GHz ISM band.
[Subject to final approval: Specifically it complies with the European Union R&TTE directive
meeting EN 300 328 and EN300 440 class 2. It also meets the FCC CFR47 Part15
regulations for use in the US and the ARIB T-66 for use in Japan.]
meeting EN 300 328 and EN300 440 class 2. It also meets the FCC CFR47 Part15
regulations for use in the US and the ARIB T-66 for use in Japan.]
16.0 Antenna Design Considerations
CT-EM260 provides an integrated antenna. The design should be effective for many
applications requiring a compact solution containing all the critical RF parts within the
module. Applications requiring better range may consider an external antenna or possibly
even an external booster circuit (power amplifier).
The range testing using the integrated antenna shows a typical distance of 100 m outdoor
line-of-sight (LOS). If the application is used indoor, the range will be around 10 to 30 m,
depending on structure and building materials.
The module with antenna is matched for use in the 2.4 GHz band. Due to the dielectric
ceramic material the antenna is shorter than a normal quarter wave antenna. However, it
applications requiring a compact solution containing all the critical RF parts within the
module. Applications requiring better range may consider an external antenna or possibly
even an external booster circuit (power amplifier).
The range testing using the integrated antenna shows a typical distance of 100 m outdoor
line-of-sight (LOS). If the application is used indoor, the range will be around 10 to 30 m,
depending on structure and building materials.
The module with antenna is matched for use in the 2.4 GHz band. Due to the dielectric
ceramic material the antenna is shorter than a normal quarter wave antenna. However, it