Shure U4D - Local Oscillator Frequency Alignment (Channel A)

Shure U4D Dual Diversity UHF Receiver
22
25D1062 (AG)
Service Procedures
Local Oscillator Frequency Alignment (Channel A)
U308
VCO
TPRF6
P202
P202
P203
PIN 1
S201
ANTENNA A IN
P202
P202
P203
S201
ANTENNA B IN
CH 2
FREQUENCY COUNTER
VC101
CH 1
(OFF)
(OFF)
J302
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.