Pll Adjustment - Yaesu FT-897 Technical Supplement

Local Oscillator Adjustment
Reference Frequency Adjustment
r Connect the frequency counter to TP1032.
r Adjust the trimmer capacitor (TC5001) for 67.875000
MHz (± 10 Hz) on the frequency counter.
r Connect an RF millivoltmeter or an oscilloscope to
pin 2 of J5002 (TP1032) and confirm that the output
level is 115 mv (± 30 mV) rms or 315 mv (± 80mV) p-p.
3ad Local Adjustment
r Connect an RF millivoltmeter or an oscilloscope to
TP1037.
r Key the transceiver on CW, and adjust T1025 for maxi-
mum indication on the RF millivolt-meter.
r Confirm that the indicated voltage is 100 mv (± 30
mV) rms or 300 mv (± 100mV) p-p.
TP1028
T1025
TP1037
TC5001
TP1029

PLL Adjustment

VCO VCV Adjustment
r Connect the DC voltmeter to pin 6 of J2002 (TP1028)
and, referring to the table below, tune the transformer/
inductor on each frequency listed. Then confirm that
the correct voltage is present, or adjust the listed com-
ponent for the required voltage.
Tune to : Adjust / Confirm
13.895 MHz Adjust T2001
76.000 MHz Confirm
32.995 MHz Adjust T2002
13.900 MHz Confirm
55.995 MHz Adjust T2003
88.000 MHz Confirm
163.995 MHz Adjust L2010
118.000 MHz Confirm
469.995 MHz Adjust L2011
420.000 MHz Confirm
1st Local Output Level
r Connect the RF millivoltmeter to pin 11 of J2002
(TP1029), and set the transceiver to 28.000 MHz.
r Confirm that the RF level is at least +3 dBm or 300
mV rms.
Alignment
For
5.5V ±0.5V
At least 0.8V
5.5V ±0.5V
At least 0.8V
5.5V ±0.5V
At least 0.8V
5.5V ±0.5V
At least 0.8V
5.5V ±0.5V
At least 0.8V
TP1032
11