Shenzhen KYL Communication Equipment Co., Ltd
Fax: +86-755-82943662 [email protected]
www.rf-data.com
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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-300H modules.
d. Large-number data transmission
In theory, when the interface data rate is faster than the RF data rate, KYL-300H
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.
9. 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.
