Shenzhen KYL Communication Equipment Co., Ltd
Fax: +86-755-83408785
www.rf-data.com
8
4800
30
Timing diagram:
c. Error dealing procedure:
To enhance the reliability and stability of user’s systems, a verify bit or a Cyclic
Redundancy Check (CRC) mode is highly recommended to resent the wrong
information while using KYL-300M modules.
d. Large-number data transmission
In theory, when the interface data rate is faster than the RF data rate, KYL-300M
transceivers can sent unlimited-long data package, but any long packages more
than 120B are not recommended. The length of each package should be between
60~100B. We also recommend user to resent the wrong information using
Automatic Error Request Equipment (ARQ).
The analyzing as below:
What if the actual transmission BER (Bit Error Rate) is 10
-4
, 1 packet with 1KB
data, which is about 10-thousand bits, is sent, theoretically, at least 1 bit will be
received wrongly, then the 1KB information will never be received correctly.
But if we package the data into 10 packets with 100B for each, when all 10
packets are sent, there will be only 1 packet wrong according to this probability.
After that, resend this wrong packet using ARQ mode. So by resending one more
packet and the efficiency rate is reduced 10%, all data will be absolutely received
correctly.
10. Antenna configuration:
Many appropriative antennas for low power RF modules are selected for meeting
different user antenna configurations. Please ask our Sales office for further
information about the antenna’s dimension and performance.
a. Helical SMA antennas
KYL-ANT-433-10-SMA: 100mm helical SMA antennas with high gain and low
cost, reach a long distance.
