Rd-200 Adjustments - Icom FP-561 Service Manual

4-5 RD-200 ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
REFERENCE 1 • Connect the antenna connector
to the FP-561's DGPS connector
FREQUENCY
and turn FP-561 power ON.
1 • Set the connected FP-561 as:
RECEIVE
SENSITIVITY Baud rate
Fequency
• Connect a standard signal gener-
ator to J4 on the ANT unit and set
as:
Fequency
Modulation
DECODE 1 • Set the connected FP-561 as:
Baud rate
Fequency
• Connect a standard signal gener-
ator to J4 on the ANT unit and set
as:
Fequency
Level
Modulation
2 • Set an SSG as :
Frequency
ANTENNA 1 • Set the connected FP-561 as:
Baud rate
(EP3)
Fequency
• Remove solder at CP1 on the
ANT unit.
2 • Conncet a traking generator (or
SSG) to the EP3 on the ANT unit
using the probe JIG and set as:
Level
Frequency
(EP4) 3 • Conncet a TG (or SSG) to the
EP4 on the ANT unit using the
probe Jig and set as:
Level
Frequency
4
After adjustment, re-solder CP1 on the ANT unit.
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
• Probe JIG
12.2(d) mm
10.2(d) mm
+ –
to TG (SSG) output
MEASUREMENT
UNIT
MAIN
ANT
: 200
: 300.0 kHz
: 300.0 kHz
: OFF
MAIN
: 200
: 300.0 kHz
: 250.0 kHz
: 1 mV (–47 dBm)
: OFF
: 350.0 kHz
ANT
: 200
: 300.0 kHz
: 7.1 mV (–30 dBm)
: 300.0 kHz
(SSG only)
: 7.1 mV (–30 dBm)
: 300.0 kHz
(SSG only)
Wire description
Kind : enamelled wire
Diameter : 1.0 mm
Roll number : 2 roll
LOCATION
Connect a frequen- 7.29920 MHz
cy counter to the
check point "CP1".
Connect a SINAD 25 % distortion
meter to J3.
Connect a DC volt- High level (5 V)
meter or oscillo-
scope to the check
point "CP2".
Low level (0 V)
Connect a spectrum TG
analyzer to J5. Peak point to 300 kHz
SSG
Maximum RF level
–40 dBm or more
TG
Peak point to 300 kHz
SSG
Maximum RF level
–40 dBm or more
ANT unit
EP4
4 - 4
ADJUSTMENT
POINT
VALUE
UNIT
MAIN
SSG
ANT
Squeeze to
PC board's edge
ADJUST
C71
Verify the
SSG level
less than
0.2 µV (–
121 dBm)
Verify
Verify
C3
Verify
C4
Verify
EP3