Icom IC-7700

4 - 3
4-2 ADJUSTMENTS ON THE OSC UNIT AND PLL UNIT
ADJUSTMENT ADJUSTMENT CONDITION OPERATION
ADJUSTMENT
POINT
VALUE
REFERENCE
SIGNAL LEVEL
1 • Reference signal source :
External
• Receiving
1) Connect an Standard Signal
Generator to J1071 ([EXT-REF I/O]
terminal on the rear panel) and set
as;
Frequecy : 10.000 MHz
Level : –10.0 dBm
Modulation : None
2) Connect a Spectrum Analyzer to
J1072.
3) Adjust the REF signal level with
L1061 and L1062.
L1061, L1062
(OSC UNIT)
(repeatedly)
Maximum
level
REFERENCE
SIGNAL LEVEL
(40MHz)
1 • Receiving 1) Connect a Spectrum Analyzer to
CP701 (PLL UNIT).
2) Adjust the REF signal (40 MHz)
level with L702 and L703.
L702, L703
(PLL UNIT)
(repeatedly)
Maximum
level
HPL
LOCK VOLTAGE
(VCO1)
1 • Frequency : 7.999 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP2
"LV2" (PLL UNIT).
2) Adjust the lock voltage with C222.
C222
(PLL UNIT)
3.9–4.1 V
(VCO2) 2 • Frequency : 14.999 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP2
"LV2" (PLL UNIT).
2) Adjust the lock voltage with C232.
C232
(PLL UNIT)
3.9–4.1 V
(VCO3) 3 • Frequency : 21.999 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP2
"LV2" (PLL UNIT).
2) Adjust the lock voltage with C242.
C242
(PLL UNIT)
3.9–4.1 V
(VCO4) 4 • Frequency : 29.999 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP2
"LV2" (PLL UNIT).
2) Adjust the lock voltage with C252.
C252
(PLL UNIT)
3.9–4.1 V
(VCO5) 5
• Frequency : 44.999 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP2
"LV2" (PLL UNIT).
2) Adjust the lock voltage with C262.
C262
(PLL UNIT)
3.9–4.1 V
(VCO6) 6 • Frequency : 60.000 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP2
"LV2" (PLL UNIT).
2) Adjust the lock voltage with C272.
C272
(PLL UNIT)
3.9–4.1 V
1st LO
OUTPUT LEVEL
1 • Frequency : 14.999 MHz
• Mode : USB
• Receiving
1) Connect a Spectrum Analyzer to
J351 "1LO" (PLL UNIT).
2) Adjust the output level with R357.
R357
(PLL UNIT)
2.35–2.85
dBm
2nd LO
LOCK VOLTAGE
1 • Frequency : 14.100 MHz
• Mode : USB
• Receiving
1) Connect a Digital multimeter to CP3
"LV3" (PLL UNIT).
2) Adjust the lock voltage with C546.
C546
(PLL UNIT)
1.7–2.3 V
RX 2nd LO
LEVEL
1 • Frequency : 14.100 MHz
• Mode : USB
• Receiving
1) Connect a Spectrum Analyzer to
J831 "R2LO" (PLL UNIT).
2) Adjust the output level with L801
and L834.
L801, L834
(PLL UNIT)
(repeatedly)
Max. level
(–20.0
dBm ±3.0
dB)
TX 2nd LO
LEVEL
1 • Frequency : 14.100 MHz
• Mode : USB
• Transmitting
1) Connect a Dummy Load to [ANT1].
2) Connect a Spectrum Analyzer to
J561 "T2LO" (PLL UNIT).
3) Adjust the output level with L565
and L566.
L565, L566
(PLL UNIT)
(repeatedly)
Max.
level
(3.0 dBm
±3.0 dB)