Shure U4D Service Manual page 23

Local Oscillator Frequency Alignment (Channel A)
ANTENNA A IN
FREQUENCY COUNTER
25D1062 (AG)
Shure U4D Dual Diversity UHF Receiver
S201
(OFF)
P202
P202
P203
VC101
U308
VCO
TPRF6
PIN 1
J302
CH 2
CH 1
Figure 6. Local Oscillator Frequency Alignment
If using a spectrum analyzer, adjust the span so that the frequency
accuracy measurement is better than1 kHz.
1. Attach a spectrum analyzer or frequency counter to TPRF6
(pin 1 of the U308 VCO).
2. Adjust VC101 for (Fo + 50 MHz) ± 5.0 kHz.
3. Disconnect the spectrum analyzer or the frequency counter from
TPRF6.
22
ANTENNA B IN
S201
(OFF)
P202
P202
P203
Service Procedures