Computime Limited CT-EM2603 ユーザーズマニュアル

 

 

 

 

 

 

The following table shows the RF channels as defined by the IEEE 802.15.4 standard.   
   

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.]   

 

 

 

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