User Guide

CCS Technical Documentation Troubleshooting - RF

RH-48

Receiver Block Diagram

Figure 18 illustrates a simplified block diagram of the receiver. The diagram shows every

major component from the antenna port to the I and Q baseband.

Note: See the Schematics chapter for an RH-48 receiver schematic.

Figure 18: Receiver block diagram

Synthesizer Troubleshooting

Faulty synthesizers can cause both Rx and Tx failures during tuning, in addition to the

VCTCXO tuning. The following synthesizers are incorporated into the RH-48:

• UHF (cell) PLL inside Jedi IC (N601)

• Tx VHF (457.2MHz) with PLL in Jedi IC

• Rx VHF (367.2MHz) with PLL in Yoda IC

-95 0..633 Note the reduced delta because the LNA is

switched on

-100 0.594

-105 0.524

-107 0.470

UNITS VDC

Rx AGC vs RF Pin for CELL Band

Conn RF

CELL

RF AGC

Comments