Receiver Adjustments - Icom IC-M802 Service Manual

4-4 RECEIVER ADJUSTMENTS

"TOTAL GAIN", "S-METER" and "DSC PEAK" adjustments must be performed at "ADJUSTMENT MODE".
ADJUSTMENT ADJUSTMENT CONDITIONS
NOISE NULL 1 • Operating frequency : 0.5 MHz
POINT • Mode
• Preset L402 and L405 to max. clock-
wise.
• Preset L401, L403, L404 and L801 to
max. counter clockwise.
• Set the standard signal generator to
OFF (no signal output).
• Receiving
RECEIVER 1 • Operating frequency : 12.2310 MHz
GAIN • Mode
• Connect a standard signal generator
to the [ANT] connector and set as:
• Receiving
TOTAL GAIN 1 • While pushing HM-135's "DOWN" key,
[TX] and [RX] switches, then turn
power ON.
• Push [2] swtich to enter the RX adjust-
ment mode.
• Connect a standard signal generator
to the [ANT] connector and set as:
• Receiving
S-METER 1 • Set the standard signal generator to
OFF (no signal output).
2 • Set the standard signal generator as:
• Receiving
DSC PEAK 1 • Push [3] switch to enter the DSC
adjustment mode.
LCD displayed :"DSC ADJUSTMENT".
• DSC frequency
• Connect a standard signal generator
to the [DSC ANT] connector and set
as:
• Receiving
DSC SELF 1 • LCD displayed :"DSC SELF CHECK"
CHECK • DSC frequency
• Connect an RF power meter to the
[DSC ANT] connector on the rear
panel.
• Receiving
*The output level of the standard signal generator (SSG) is indicated as the SSG's open circuit.
: H3E
: J3E
Frequency : 12.2310 MHz
Level : 0.5 µV*
(–113 dBm)
Modulation : OFF
Frequency : 12.3540 MHz
Level : 320 µV*
(–57 dBm)
Modulation : OFF
Frequency : 12.3540 MHz
Level : 10 mV*
(–27 dBm)
: 8.4145 MHz
Frequency : 8.4145 MHz
Level : 0.5 µV*
(–113 dBm)
Modulation : OFF
: 8.4145 MHz
MEASUREMENT
UNIT LOCATION
Front Connect an AC milli-
panel voltmeter to the [SP]
jack with a 4 Ω dummy
load.
Front Connect an AC milli-
panel voltmeter to the [SP]
jack with a 4 Ω dummy
load.
• Push the [ENT] switch to write the adjustment value in the mem-
ory.
• Push the [ENT] switch to write the adjustment value in the mem-
ory.
• Push the [ENT] switch to write the adjustment value in the mem-
ory.
Front Connect an AC milli-
panel voltmeter to the [SP]
jack with a 4 Ω dummy
load.
• Push the [ENT] switch, and then verify to return to the "Main
menu" on the LCD display.
When this check is failure, displayed "NG" on LCD, and beep
sound.
4 - 7
ADJUSTMENT
VALUE
UNIT ADJUST
Minimum output MAIN
level
Maximum out- MAIN
put level
Maximum out- MAIN
put level
L207
L208,
L209,
L210,
L301,
L302,
L307
L2306,
L2307