User Manual
Table Of Contents
SECTION 2: FACTORY TEST PROCEDURE
IP4HPVGPS-MRFCCRpt.doc Page 18
Downlink Hardware Timing Verification
Figure 2-3 displays a plot of the downlink timing characteristics. Channel 1 is connected to RSSI,
channel 2 is connected to recovered audio, and channel 3 is connected to the modem CS pin. The scope
is in the high-resolution acquisition mode.
There is a very short period of quiet time (no modulation) followed by approximately 12 milliseconds of
modem synchronization time (sync time).
Figure 2-3: Downlink Timing Characteristics Plot