User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8
31
Confidential and Proprietary, ©MaxStream, Inc. 2001
Range
(meters)
Received
Power
Detectable by
9XStream module
Detectable by
commercial
radio
100
-68.526 dBm
YES YES
500
-82.506 dBm
YES YES
1000
-88.526 dBm
YES YES
3000
-92.048 dBm
YES NO
5000
-102.506 dBm
YES NO
8000
-106.588 dBm
YES NO
10000
-108.526 dBm
YES NO
11265
(7 miles)
-109.559 dBm
YES NO
12000
-110.805 dBm
NO NO
Since the range doubles every 6dB, the 20dB sensitivity difference in radios
corresponds to 2^(20/6) = 10.08 times the range using the MaxStream radio!
In a similar fashion, MaxStream radios offer 32 times the range of –80 dBm
radios and over 100 times the range of –70 dBm radios.
How Does the ‘SY’ Command Affect Packet Transmission?
Experiment 1 – Byte Transmission
Two 19200-baud 9XStream wireless modules were configured
with the sync timer command (SY) set to 20 ms (2 seconds)
and the transmission times were observed. One byte was sent
when the modules were out of sync and was followed (within 2
seconds) by a second byte. Figure A1 shows the observed
results from the oscilloscope. (The pulse on the transmitter is
shown in yellow and the pulse on the receiver in blue.)
Figure A1 – Oscilloscope output of first
byte on transmit and receive ends.
Figure A2 – Oscilloscope output of
second byte with SY set to 20.