CALAMP WIRELESS NETWORKS INC. BDD4T881 Manuel D’Utilisation
120 20170-200
Paragon
PD
Technical Manual
48
6.4.2.6
RSSI Adjustment (VHF: T835)
Note: This check is only recommended for Paragon/R model running DBA protocol 3.06.009
series or later.
-
Apply an on-channel signal from the RF generator at a level of -100dBm with deviation of
±3kHz (full channel) or ±1.5kHz (half channel) at 1kHz tone.
±3kHz (full channel) or ±1.5kHz (half channel) at 1kHz tone.
-
Adjust RV320 (RSSI level) to give 4.5V RSSI output at RSSI test point (near of quad. Coil
L360) or on backplane SK1 pin 5 when measured with a voltmeter
L360) or on backplane SK1 pin 5 when measured with a voltmeter
-
Vary the RF level in 15dB steps and check that the RSSI output voltage (SK1 pin5) changes at
a rate of a 15dB/V (+/- 0.30VDC) over the range of -120 dBm to -80dBm (see Figure 29). If
the requirement cannot be reached, contact your Dataradio technical support.
a rate of a 15dB/V (+/- 0.30VDC) over the range of -120 dBm to -80dBm (see Figure 29). If
the requirement cannot be reached, contact your Dataradio technical support.
Figure 29 - T835, RSSI Curve: Volt to dBm
Figure 30 – T800-50-0001 Backplane and test pins location
1
2
3
4
5
6
6
7
8
8
O
F
F
F
F
1
2
3
4
5
6
6
7
8
8
O
F
F
F
F
SW2
SW1
RX
C
H
AN
EL
S
W
IT
H
TX
CH
A
N
E
L
S
W
IT
CH
OFF
ON
OFF
ON
PL1
SK1
1
5
6
RSSI ouput SK1 pin 5
RX-Audio1 SK1 pin 6