Uhf Range 2 (450-520 Mhz) Band; Figure 3-38. Frequency Generation Unit Block Diagram (Uhf Range 2) - Motorola ASTRO XTL 1500 Detailed Service Manual

Digtal, vhf/uhf range 1/uhf range 2/700–800 mhz

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Table of Contents

3.13.3 UHF Range 2 (450–520 MHz) Band

1st local oscillator, and a modulated transmitter RF carrier that is further amplified by the power

amplifier section of the radio.

The FGU consists of the following:

• Reference oscillator (Y5750)

• Low-voltage Fractional-N (LV Frac-N) synthesizer (U5752)

• Three receiver voltage-controlled oscillators (VCOs)

• Two transmitter VCOs

• Three receiver LO amplifiers (Q5904, Q5902 and Q5906)

• Two transmitter injection amplifiers (Q5828, and Q5829)

DETECTOR BIAS

Q5750 RX and

Super Filter

June 15, 2005

3-38) provides the XTL 1500 radio with a 16.8 MHz reference frequency, receiver

16.8MHz Reference

to Controller and

Receiver Back End

Prescaler Input

to Controller

Theory of Operation: Frequency Generation Unit (FGU)

6815854H01-A

Troubleshooting