Dataradio Paragon, Техническое руководство

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120 20170-204a Paragon
PD
Technical Manual
49
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.
- Adjust RV320 (RSSI level) to give 4.5V RSSI output at RSSI test point (near quad. Coil L360) or on
backplane SK1 pin 5 when measured with a voltmeter (Figure 28 for test point location).
- Vary the RF level and check the RSSI output voltage (Figure 27):
1) At –120 dBm: 3.0 VDC (+0.20 –0.45VDC)
2) At –105 dBm: 4.0 VDC (+0.20 –0.20 VDC)
3) At –90dBm: 5.0 VDC (+0.20 – 0.25VDC)
If the requirement cannot be reached, contact your Dataradio technical support.
Figure 27 - T835, RSSI Curve: Volt to dBm
Figure 28 - T800-50-0001 Backplane and test pins location
1
2
3
4
5
6
7
8
O
F
F 1
2
3
4
5
6
7
8
O
F
F
SW2 SW1
RX
C
H
AN
EL
S
W
IT
C
H
TX
C
H
A
N
E
L
S
W
IT
C
H
O
FF
ON
O
FF
ON
PL1
SK1
1
5
6
RSSI ouput SK1 pi n 5
RX-Audi o1 SK1 pin 6