Multitech MultiModem Cell MTCBA-C1 User's Guide Page 116

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Chapter 19 – Antenna Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 116
Set Secondary Antenna Diagnostic Limits
Command Response
Attach active GPS antenna. Enable power to the antenna.
AT+WANT=1<cr>
AT+ADC=7<cr>
Request the secondary antenna ADC voltage.
Assume a +/- 5% variance in antenna ADC reading.
Powered low limit = 200 – (.05 * 200) = 190
Powered high limit = 200 + (.05 * 200) = 210
AT+WANTLIM=1,2,0,255,190,210<cr>
Set secondary antenna diagnostic limits.
AT+WANTS<cr>
Check antenna diagnostic status.
OK
+ADC: 200
OK
OK
+WANTS: 1,1
OK
For Hardware Versions Earlier than 2.1
This example shows how to calculate and specify antenna diagnostic low and high limit values for
hardware versions earlier than 2.1. The AT+ADC command is used to read the value of the
antenna voltage divider so that the limits can be determined. Please note that this is an example
only. Your antenna characteristics may be different.
Set Primary Antenna Diagnostic Limits
Command Response
AT+WANTADC=0
Note: Enable primary antenna internal ADC as the source
of the primary antenna diagnostic reading.
Attach primary antenna.
AT+ADC=6<cr>
Request the primary antenna ADC voltage.
Assume a +/- 5% variance in antenna ADC reading.
Low limit = 130 – (.05 * 130) = 123
Open limit = 130 + (.05 * 130) = 137
AT+WANTLIM=1,1,123,137<cr>
Set primary antenna diagnostic limits.
AT+WANTS<cr>
Check antenna diagnostic status.
OK
+ADC: 130
OK
OK
+WANTS: 1,1
OK
Set Secondary Antenna Diagnostic Limits
Attach active GPS antenna. Enable power to the antenna.
AT+WANT=1<cr>
AT+ADC=7<cr>
Request the secondary antenna ADC voltage.
Assume a +/- 5% variance in antenna ADC reading.
Powered low limit = 200 – (.05 * 200) = 190
Powered high limit = 200 + (.05 * 200) = 210
AT+WANT=2<cr>
Enable non-powered testing of the antenna.
OK
+ADC: 200
OK
OK
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