Midland Syn-Tech III P25 - RSSI Adjustment; C4 FM Receive Level Adjustment

SYN-TECH III P25 PORTABLE RADIO
SERVICE MANUAL
4-5
4.4.9 RSSI Adjustment
a. Enter “RSSI Adjustment” window.
b. Set the RF signal frequency to the test frequency without modulation.
c. Set the RF signal level at the antenna input to the selected levels on RSSI Adjustment window and
click “READ RSSI”.
d. Displayed RSSI values should be “@ -114 dBm: 170 ±15, @ -102 dBm: 230 ±15”.
4.4.10 C4FM Receive Level Adjustment
a. Enter “C4FM Receive Level Adjustment” window.
b. Set the RF signal frequency to the test frequency, modulation frequency to 1200Hz, deviation to
940Hz and RF signal level to -47dBm referred at the antenna input and click “READ RECEIVE
LEVEL”.
c. The Displayed DC voltage level should be 0.95 ±0.1 V
DC
and the AC voltage level should be 140
±15mV
pp
.