Technical Manual

120 20170-201 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.
- 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
- Vary the RF level and check the RSSI output voltage :
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 29 - T835, RSSI Curve: Volt to dBm
Figure 30 – 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 HAN EL SWITC H
TX C HA NEL SWITC H
OFF
ON
OFF
ON
PL1
SK1
1
5
6
RSSI ouput SK1 pin 5
RX-Audi o1 SK1 pi n 6