Shenzhen KYL Communication Equipment Co., Ltd
Fax: +86-755-83408785 [email protected] www.rf-data.com
In theory, when the interface data rate is faster than the RF data rate, KYL-220
transceivers can sent unlimited-long data package, but long packages more than
120B are not recommended. The length of each package should be between
60~100B. We also recommend our users to use Automatic Error Request
Equipment (ARQ) to prevent wrong information.
Reasons:
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 to meet
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.
b. Magnetic vehicle antenna
KYL-ANT-O433S-300H1.5-SMA: include magnetic antenna base, suitable for
equipment with metal shell, easy for fixing, effective to enhance the transmission
distance.
For more kinds of antennas
，
please go to our website:
http://www.rf-data.com/Products_list_en.asp?classid=163
If you have special requirements on antennas, please specify, we can design and
produce for you individually.
