Vco And Related Circuitry (Vhf Radios); Minimum And Maximum Frequencies For The Different Vhf Frequency Bands - Tait TM9100 Service Manual

9.7

VCO and Related Circuitry (VHF Radios)

If there is no fault with the power supplies, the PLL inputs and output, and
Introduction
the loop filter, check the VCO and related circuitry. The procedures in this
section apply only to VHF radios; the VHF frequency bands are defined in
Table
The measurement points for diagnosing faults in the VCO and related
circuitry are summarized in
Table 9.4

Minimum and maximum frequencies for the different VHF frequency bands

Frequency band
B1
206 Frequency Synthesizer Fault Finding
9.4. There are six aspects:
Task 28: check VCO
Task 29: repair PLL feedback
Task 30: repair VCO
Task 31: check transmit-receive switch
Task 32: repair switching network
Task 33: check buffer amplifier
Frequency in MHz
Minimum
84 ± 5
Figure 9.11.
Maximum
200 ± 5
© Tait Electronics Limited August 2005
TM9100 Service Manual