4-4 RECEIVER ADJUSTMENTS

”TOTAL GAIN”, “S-METER” and “DSC PEAK” adjustments must be performed at “ADJUSTMENT MODE”.

ADJUSTMENT

ADJUSTMENT CONDITIONS

 

MEASUREMENT

VALUE

ADJUSTMENT

 

 

 

 

 

UNIT

 

LOCATION

UNIT

ADJUST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOISE NULL

1

• Operating frequency

: 0.5 MHz

Front

 

Connect an AC milli-

Minimum output

MAIN

L207

POINT

 

• Mode

: H3E

panel

 

voltmeter to the [SP]

level

 

 

 

 

• Preset L402 and L405 to max. clock-

 

 

jack with a 4 Ω dummy

 

 

 

 

 

wise.

 

 

 

load.

 

 

 

 

 

• 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

Front

 

Connect an AC milli-

Maximum out-

MAIN

L208,

GAIN

 

• Mode

: J3E

panel

 

voltmeter to the [SP]

put level

 

L209,

 

 

• Connect a standard signal generator

 

 

jack with a 4 Ω dummy

 

 

L210,

 

 

to the [ANT] connector and set as:

 

 

load.

 

 

L301,

 

 

Frequency

: 12.2310 MHz

 

 

 

 

 

L302,

 

 

Level

: 0.5 µV*

 

 

 

 

 

L307

 

 

 

(–113 dBm)

 

 

 

 

 

 

 

 

Modulation

: OFF

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TOTAL GAIN

1

• While pushing HM-135’s “DOWN” key,

• Push the [ENT] switch to write the adjustment value in the mem-

 

 

[TX] and [RX] switches, then turn

ory.

 

 

 

 

 

 

 

power ON.

 

 

 

 

 

 

 

 

 

• Push [2] swtich to enter the RX adjust-

 

 

 

 

 

 

 

 

ment mode.

 

 

 

 

 

 

 

 

 

• Connect a standard signal generator

 

 

 

 

 

 

 

 

to the [ANT] connector and set as:

 

 

 

 

 

 

 

 

Frequency

: 12.3540 MHz

 

 

 

 

 

 

 

 

Level

: 320 µV*

 

 

 

 

 

 

 

 

 

(–57 dBm)

 

 

 

 

 

 

 

 

Modulation

: OFF

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

S-METER

1

• Set the standard signal generator to

• Push the [ENT] switch to write the adjustment value in the mem-

 

 

OFF (no signal output).

ory.

 

 

 

 

 

 

 

 

 

 

2

• Set the standard signal generator as:

• Push the [ENT] switch to write the adjustment value in the mem-

 

 

Frequency

: 12.3540 MHz

ory.

 

 

 

 

 

 

 

Level

: 10 mV*

 

 

 

 

 

 

 

 

 

(–27 dBm)

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSC PEAK

1

• Push [3] switch to

enter the DSC

Front

 

Connect an AC milli-

Maximum out-

MAIN

L2306,

([USA],[CAN]

 

adjustment mode.

 

panel

 

voltmeter to the [SP]

put level

 

L2307

only)

 

LCD displayed :“DSC ADJUSTMENT”.

 

 

jack with a 4 Ω dummy

 

 

 

 

 

• DSC frequency

: 8.4145 MHz

 

 

load.

 

 

 

 

 

• Connect a standard signal generator

 

 

 

 

 

 

 

 

to the [DSC ANT] connector and set

 

 

 

 

 

 

 

 

as:

 

 

 

 

 

 

 

 

 

Frequency

: 8.4145 MHz

 

 

 

 

 

 

 

 

Level

: 0.5 µV*

 

 

 

 

 

 

 

 

 

(–113 dBm)

 

 

 

 

 

 

 

 

Modulation

: OFF

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

• LCD displayed :”DSC SELF CHECK”

• Push the [ENT] switch, and then verify to return to the “Main

DSC SELF

 

• DSC frequency

: 8.4145 MHz

menu” on the LCD display.

 

 

 

CHECK

 

• Connect an RF power meter to the

When this check is failure, displayed “NG” on LCD, and beep

([USA],[CAN]

 

[DSC ANT] connector on the rear

sound.

 

 

 

only)

 

panel.

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*The output level of the standard signal generator (SSG) is indicated as the SSG’s open circuit.

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