Icom IC-7000 Service Manual

SERVICE
MANUAL

HF/VHF/UHF ALL MODE TRANSCEIVER

S-14214HZ-C1
Dec. 2005

INTRODUCTION

DANGER

This service manual describes the latest service information
for the

IC-7000 HF/VHF/UHF ALL MODE TRANSCEIVER

at the time of publication.

VER.NO. VERSION SYMBOL

#02 Europe EUR
#03 France FRA
#04 Spain ESP
#05 U.S.A. USA
#08 Export EXP
#10 United Kingdom UK

To upgrade quality, all electrical or mechanical parts and internal
circuits are subject to change without notice or obligation.

NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. Such a connection
could cause a fire or electric hazard.

DO NOT expose the transceiver to rain, snow or any liquids.

DO NOT reverse the polarities of the power supply when

connecting the transceiver.

DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the trans­ceiver's front end.

ORDERING PARTS

Be sure to include the following four points when ordering
replacement parts:

1. Make sure the problem is internal before disassembling
the transceiver.

REPAIR NOTES

2. DO NOT open the transceiver until the transceiver is

1. 10-digit Icom parts number

2. Component name and informations

3. Equipment model name and unit name

4. Quantity required

disconnected from its power source.

3. DO NOT force any of the variable components. Turn
them slowly and smoothly.

4. DO NOT short any circuits or electronic parts. An
insulated turning tool MUST be used for all adjustments.

<SAMPLE ORDER>

5. DO NOT keep power ON for a long time when the
transceiver is defective.

5030002820 LCD LTA025A161A IC-7000 Front unit 5 pieces
8810009610 Screw FH M2.6 × 6 ZK IC-7000

To p c ove r

10 pieces

6. DO NOT transmit power into a signal generator or a
sweep generator.

7. ALWAYS connect a 50 dB to 60 dB attenuator between

Addresses are provided on the inside back cover for your
convenience.

the transceiver and a deviation meter or spectrum
analyzer when using such test equipment.

8. READ the instructions of test equipment thoroughly
before connecting equipment to the transceiver.

Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.

TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 3 CIRCUIT DESCRIPITON

3 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1

3 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 4

3 - 3 DDS CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 6

3 - 4 LOGIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 8

3 - 5 POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 8

3 - 6 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 9

SECTION 4 ADJUSTMENT PROCEDURES

4 - 1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1

4 - 2 DDS ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3

4 - 3 DISPLAY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3

4 - 4 TRANSMITTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3

4 - 5 RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 11

SECTION 5 PARTS LIST

SECTION 6 MECHANICAL PARTS AND DISASSEMBLY

SECTION 7 SEMI-CONDUCTOR INFORMATION

SECTION 8 BOARD LAYOUTS

8 - 1 DISPLAY UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1

8 - 2 VR UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1

8 - 3 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 3

8 - 4 PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 5

8 - 5 DDS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 7

8 - 6 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 9

8 - 7 CONNECT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 11

8 - 8 DRIVER UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 11

8 - 9 HM-151 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 11

SECTION 9 WIRING DIAGRAM

SECTION 10 BLOCK DIAGRAM

SECTION 11 CIRCUIT DIAGRAMS

11 - 1 DISPLAY/VR/CONNECT UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 1

11 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 3

11 - 3 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 7

11 - 4 PA/DRIVER UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 10

11 - 5 DDS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 13

SECTION 1 SPECIFICATIONS

¤ GENERAL

• Frequency coverage :
Receive 0.030 – 199.999999 MHz*

400.000 – 470.000000 MHz*
Transmit 1.800 – 1.999999 MHz*

3.500 – 3.999999 MHz*

5.260 – 5.405000 MHz*

7.000 – 7.300000 MHz*

10.100 – 10.150000 MHz

14.000 – 14.350000 MHz

18.068 – 18.168000 MHz

21.000 – 21.450000 MHz

24.890 – 24.990000 MHz

28.000 – 29.700000 MHz

50.000 – 54.000000 MHz*

144.000 – 148.000000 MHz*

430.000 – 450.000000 MHz*
*1 Some frequency bands are not guaranteed.
*

2

Depending on version.

• Mode : USB, LSB, CW, RTTY (FSK), AM,
FM, WFM (WFM is for receiver only)

• Number of memory ch. : 503 (495 split, 6 scan edges, 2 call)

• Antenna connector : SO-239 × 2
(for HF/50 MHz and 144/430 MHz)/50

• Power supply requirement : 13.8 V DC ±15% (negative ground)

• Frequency stability : Less than ±0.5 ppm
(0˚C to +50˚C ;+32˚F to +122˚F)

• Current drain :

Transmit at 100 W 22 A
Receive standby 1.3 A
max. audio 1.6 A

• Usable temperature range : –10˚C to +60˚C (+14˚F to +140˚F)

• Dimensions : 167(W) × 58(H) × 180(D) mm

9

(proj. not included) 6

⁄16(W) × 29⁄32(H) × 73⁄32(D) inch

• Weight (approx.) : 2.3 kg (5 lb 1 oz)

• CI-V connectors : 2-conductor 3.5 (d) mm (

• Video connector : 2-conductor 3.5 (d) mm (

• ACC connector : 13-pin

• Data connector : 6-pin

1

2

,

*

1

2

,

*

2

2

2

2

2

2

2

Ω

1

⁄8″)

1

⁄8″)

¤ TRANSMITTER

• Output power :

SSB/CW/
RTTY/FM

1.8–50 MHz bands 2–100 W 1–40 W
144 MHz band 2–50 W 2–20 W
430 MHz band 2–35 W 2–14 W

• Modulation system :
SSB Digital PSN modulation

AM Digital Low Power modulation
FM Digital Phase modulation

• Spurious emissions :
below 30 MHz bands Less than –50 dB

above 50 MHz bands Less than –60 dB

• Carrier suppression : More than 50 dB

• Unwanted sideband : More than 50 dB

• Microphone connector : 8-pin modular jack (600 Ω)

• KEY connector : 3-conductor 6.35 (d) mm (

• RTTY connector : 3-conductor 3.5 (d) mm (

AM

1

⁄4″)

1

⁄8″)

¤ RECEIVER

• Receive system :
SSB/CW/AM/FM Triple conversion superheterodyne

WFM Double conversion superheterodyne

• Intermediate frequencies :

1st IF 2nd IF 3rd IF

SSB/CW/AM/

RTTY/FM

WFM 134.732 MHz 10.700 MHz ––

• Receive sensitivity : (pre-amp ON)

0.5–1.8 MHz –– 13 µV –– ––

1.8–28 MHz*

28–29.995 MHz*

50 MHz band 0.12 µV 1.0 µV 0.25 µV ––

76–108 MHz –– –– –– 10 µV

144/430 MHz

bands

Note: SSB, CW and AM modes are measured at 10 dB S/N; FM mode at

12 dB SINAD.

1

*

Except 4–4.5 MHz, 8–9 MHz.

*2 FM mode: 28–29.7 MHz

• Squelch Sensitivity : (pre-amp ON)
SSB Less than 5.6 µV
FM Less than 0.3 µV

• Selectivity : (Sharp filter is selected)

SSB (BW=2.4 kHz) More than 2.4 kHz/–6 dB
Less than 3.6 kHz/–60 dB

CW (BW=500 Hz) More than 500 Hz/–6 dB
Less than 900 Hz/–60 dB

RTTY (BW=350 Hz) More than 360 kHz/–6 dB
Less than 650 kHz/–60 dB

AM (BW=6 kHz) More than 6.0 kHz/–6 dB
Less than 15 kHz/–60 dB

FM (BW=15 kHz) More than 12 kHz/–6 dB
Less than 20 kHz/–60 dB

• Spurious and image rejection ratio:

HF bands More than 70 dB

50 MHz band More than 70 dB (except IF/2 through)
144/430 MHz bands More than 65 dB

• Audio output power : More than 2.0 W at 10% distortion
(at 13.8 V DC) with an 8 Ω load

• RIT variable range : ±9.99 kHz

• PHONES connector : 3-conductor 3.5 (d) mm (

• EXT SP connector : 2-conductor 3.5 (d) mm (

124.487 MHz 455 kHz 16.15 kHz

SSB/

CW/

AM FM WFM

RTTY

1

0.15 µV 2.0 µV

2

–– ––

0.5 µV ––

0.11 µV 1.0 µV 0.18 µV ––

(except 144 MHz band IF through)

1

⁄8″)/8 Ω

1

⁄8″)/8 Ω

1 - 1

SECTION 2 INSIDE VIEWS

DDS UNIT

RX 1st mixer
(IC401: SPM5001)

YGR amplifier
(IC1:

PC2709T)

2nd Lo amplifier
(Q151*: 2SC4673)

3rd Lo DDS
(IC51*: AD9833BRM)

1st Lo DDS
(IC301*: AD9951YSV)

MAIN UNIT

LOGIC UNIT

RX 3rd mixer
(IC1301: TA4107F)

RX 2nd mixer
(D801: HSB88WS-E)

RF switch
(Q101: 2SC4213)

CPU
(IC1302: HD64F2377VFQ33V)

430 MHz pre amplifier
(Q451: 3SK291)

PA UNIT

144 MHz power amplifier
(Q501: RD70HVF1)

430 MHz power amplifier
(Q401: RD60HUF1)

DRIVER BOARD*

HF/50 MHz power amplifier
(Q301, Q302: RD70HHF1)

144 MHz pre amplifier
(Q551*: 3SK291)

LPF circuit

• TOP VIEW

LOGIC UNIT

LOGIC UNIT

MAIN UNIT

MAIN UNIT

CPU

CPU
(IC1302: HD64F2377VFQ33V)

(IC1302: HD64F2377VFQ33V)

RX 3rd mixer

TX 3rd mixer
(IC1301: TA4107F)

(IC1301: TA4107F)

2nd mixer

RX 2nd mixer
(D801: HSB88WS-E)

(D801: HSB88WS-E)

RF switch

RF switch
(Q101: 2SC4213)

(Q101: 2SC4213)

DDS UNIT

DDS UNIT

1st Lo DDS

1st Lo DDS
(IC301*: AD9951YSV)

(IC301*: AD9951YSV)

2nd Lo amplifier

2nd Lo amplifier
(Q151*: 2SC4673)

(Q151*: 2SC4673)

3rd Lo DDS

3rd Lo DDS
(IC51*: AD9833BRM)

(IC51*: AD9833BRM)

RX 1st mixer

1st mixer
(IC401: SPM5001)

(IC401: SPM5001)

YGR amplifier

YGR amplifier
(IC1: µPC2709T)

(IC1:

µPC2709T)

• BOTTOM VIEW

PA UNIT

PA UNIT

430 MHz pre amplifier

430 MHz pre amplifier
(Q451: 3SK291)

(Q451: 3SK291)

144 MHz power amplifier

144 MHz power amplifier
(Q501: RD70HVF1)

(Q501: RD70HVF1)

430 MHz power amplifier

430 MHz power amplifier
(Q401: RD60HUF1)

(Q401: RD60HUF1)

DRIVER BOARD*

DRIVER UNIT*

HF/50 MHz power amplifier

HF/50 MHz power amplifiers
(Q301, Q302: RD70HHF1)

(Q301, Q302: RD70HHF1)

2 - 1

144 MHz pre amplifier

144 MHz pre amplifier
(Q551*: 3SK291)

(Q551*: 3SK291)

LPF circuit

*Located under side of the point

LPF circuit

SECTION 3 CIRCUIT DESCRIPTION

3-1 RECEIVER CIRCUITS

3-1-1 HF/50 MHz RF CIRCUIT (MAIN AND PA UNITS)

The HF/50 MHz RF filters pass only the desired band sig­nals and suppress undesired band signals. The HF/50 MHz
RF circuit has 7 low-pass and 5 high-pass filters for speci­fied band use.

The HF/50 MHz RF signals from the [ANT1] connector, pass
through one of 7 low-pass filters as below, the TX/RX switch
(PA unit; RL801), low-pass filter (PA unit; L801, L802, C801
–C805) and band switch (D151), and are then applied to the
MAIN unit via J101 (MAIN unit).

• Used RF low-pass fi lter (PA unit)

Frequency

(MHz)

0.03–2 MHz L1 RL881 15–22 MHz L5 RL941
2–4 MHz L2 RL921 22–30 MHz L6 RL821
4–8 MHz L3 RL841 30–60 MHz L7 RL861

8–15 MHz L4 RL901

The signals from the PA unit are applied to the RF switch
(Q101) via the band switch (D113) and then passed through
the 20 dB attenuator (D101, D102).

The signals below 1.8 MHz are passed through the low-pass
filter (L103, L104, C106, C110, C111) and then applied to
the preamplifier circuit.

The other band signals (1.8–60 MHz) are passed through
the high-pass filter (L105, L109, L110, L116, L117, C108,
C109, C114–C116) to suppress strong signals below

1.8 MHz and then applied to the low-pass and high-pass fil­ter circuits.

(1) 1.8–2 MHz
The filtered signals from the high-pass filter are passed
through the low-pass filter (L205, L207, C209–C213) and
then applied to the preamplifier circuits.

(2) 2–30 MHz

The filtered signals from the high-pass filter are applied to
one of 5 high-pass filters as at right above after passed
through the low-pass filter (L205, L207, C209–C213) and
are then applied to the preamplifier circuit.

Control

signal

Entrance

relay

Frequency

(MHz)

Control

signal

Entrance

relay

• Used RF high-pass fi lter (MAIN unit)

Frequency

(MHz)

1.8–2 MHz B1 D204 13.9–20.9 MHz B5 D210
2–3.4 MHz B2 D205 20.9–30 MHz B6 D211

3.4–6.9 MHz B3 D208 30–60 MHz B7 D212

6.9–13.9 MHz B4 D209

Control

signal

Entrance

diode

Frequency

(MHz)

Control

signal

Entrance

diode

(3) 30–60 MHz

The filtered signals from the high-pass filter are passed
through another high-pass filter (L215, L217, C228, C229,
C237, C238) and then amplified at the RF amplifier (Q211).

The amplified signals are applied to the preamplifier circuit.

3-1-2 VHF AND UHF RF CIRCUITS (PA UNIT)

The VHF and UHF RF circuits filter and amplify only the
desired band signals and suppress undesired band signals.
The both RF circuits have preamplifiers and bandpass filters.

• VHF RF CIRCUIT

The VHF RF signals from the [ANT2] connector pass
through the low-pass filters (L506, L508, L510, L601–L603,
C516, C519, C521, C601, C602) and antenna switching cir­cuit (D507–D509). The switched signals are passed through
the attenuator (D551, D552) and bandpass filter (D553,
D554, D556). The filtered signals are applied to the pream­plifier (Q551) and then passed through another bandpass
filter (D558–D560).

The filtered signals are passed through the band switch
(D462) and then applied to the 1st mixer circuit (MAIN unit)
via J101 (MAIN unit).

• UHF RF CIRCUIT

The UHF RF signals from the [ANT2] connector pass
through the low-pass (L601–L603, C601, C602) and high­pass (L413, L414, C428, C429, C431, C433) filters and
then applied to the antenna switching circuit (D408–D410).
The switched signals are passed through the attenuator
(D451, D452) and then amplified at the preamplifier (Q451)
between the 2 bandpass filters (D453–D456). The filtered
signals are amplified at another preamplifier (IC471, pins 1, 4).

• RECEIVER CONSTRUCTION

PA UNIT

[ANT1]

0.03–60 MHz

LPF

[ANT2]
60–470 MHz

LPF

MAIN UNIT

HPF

BPF

Preamp.

Q301

amp.

1st LO:

124.517 MHz–

594.587 MHz

1st mixer

IC401

FI601

Crystal

filter

124.487 MHz

(WFM; 134.732 MHz)

3 - 1

2nd LO:

124.032 MHz

2nd mixer

D801

FI901

Crystal

filter

455 kHz

to WFM detector
circuit (IC1401)

FI1101

Crystal

filter

455 kHz

3rd LO:

438.85 kHz

to DSP circuit

3rd mixer

IC1101

The amplified signals are passed through the band switch
(D461) and then applied to the 1st mixer circuit (MAIN unit)
via J101 (MAIN unit).

D453–D456, D553, D554, D556 and D558–D560 are
varactor diodes that tune the center frequency of an RF
passband for wide bandwidth receiving and good image
response rejection.

When receiving the signals, higher than 129 MHz, are
received, the switching diodes (D555, D557) are turned off
by the control signal “2MBL” from the CPU (LOGIC unit;
IC1302) via Q2150, then the varactor diodes (D556, D558)
are disconnected to shift the filtering frequencies.

3-1-3 PREAMPLIFIER CIRCUIT (MAIN UNIT)

The preamplifier circuit amplifies received RF signals for
wide band frequency range.

When the preamplifier is turned ON, the RF signals
(HF/50 MHz bands) from the high-pass filters are applied to
the preamplifier (Q301) via the preamplifier switches (D301,
D302).

When the preamplifier is turned OFF, the RF signals (HF/50
MHz bands) are passed through the bypass switches (D301,
D303).

The amplified or bypassed signals are applied to the 1st
mixer circuit (IC401).

3-1-4 1ST MIXER CIRCUIT (MAIN UNIT)

The 1st mixer circuit mixes the received RF signals with the
1st LO signal to convert the receive signal frequencies to
the 1st IF frequency.

3-1-5 1ST IF CIRCUIT (MAIN UNIT)

The 1st IF circuit filters and amplifies the 1st IF signal.

The converted 1st IF signal is
applied to the IF amplifier (Q502)
via RX switches (D502, D505).

The 124.487 MHz 1st IF signal
(except WFM mode) passes
through the crystal filter (FI601)
via the mode switches (D602,

• 1st IF frequency

Mode 1st IF

USB 124.48850 MHz

LSB 124.48550 MHz

CW 124.48700 MHz

RTTY 124.48683 MHz

AM/FM 124.48700 MHz

WFM 134.73200 MHz

D604), and the 134.732 MHz 1st
IF signal (WFM mode) passes through the bandpass filter
(L607, L609, C602, C606, C608–C610, C617, C618) via the
mode switches (D601, D603) to suppress out-of-band sig­nals.

Then the filtered signal is applied to the IF amplifier (Q702)
and then applied to the 2nd mixer circuit (D801) via the RX
switches (D702, D704).

3-1-6 2ND MIXER CIRCUIT (MAIN UNIT)

The 2nd mixer circuit mixes the 1st IF signal with the 2nd
LO signal to convert into the 2nd IF frequency.

The amplified signal from the IF amplifier (Q702) is applied
to the 2nd mixer circuit (D801) and then mixed with the 2nd
LO signal (124.032 MHz) to convert into the 455 kHz (other
than WFM) or 10.7 MHz (WFM) 2nd IF signal.

The 2nd LO signal is generated in the DDS unit, and applied
to the 2nd mixer circuit (D801) after being filtered and
attenuated at the low-pass filter (L808, C816, C817) and the
attenuators (R801, R805, R806, R809–R811), respectively.

The converted 2nd IF signal is applied to the 2nd IF circuit.

While receiving the HF/50 MHz bands signals, the amplified
signals from the preamplifier switch (D304) or the bypassed
signals from the bypass switch (D303) are passed through
the low-pass filter (L310, L312, C314, C316, C318, C320,
C322) and then applied to the 1st mixer circuit (IC401) via
the band switch (D305).

While receiving the VHF/UHF bands signals, the signals
from the VHF/UHF RF circuit (PA unit) are passed through
the low-pass filter (L309, L311, L313, C313, C315, C317,
C319, C321, C323, C325) and then applied to the 1st mixer
circuit (IC401) via the band switch (D306).

The applied signals are mixed with the 1st LO signal (124.517
–594.487 MHz) and convert into the 1st IF signal.

The 1st LO signal is generated in the DDS unit, and applied
to the 1st mixer circuit (IC401, pins 1, 6) after being ampli­fied and attenuated at the 1st LO amplifier (IC421, pins 1, 4)
and the attenuators (R416–R418, R421–R423), respectively.

The converted 1st IF signal is applied to the 1st IF circuit.

3-1-7 2ND IF CIRCUIT (MAIN UNIT)

The 2nd IF circuit amplifies and filters the 2nd IF signal.

The converted 2nd IF signal is applied to the bandpass filter
(FI901) to suppress undesired signals.

The 455 kHz 2nd IF signal (except
WFM mode) is passed through the
bandpass filter (FI901) via the mode
switch (D803) and then amplified
at the IF amplifier (Q902). The
amplified signal is passed through
the bandpass filter (FI1001) and
then applied to another IF amplifier
(Q1001).

The amplified signal is applied to the 3rd mixer circuit.

The 10.7 MHz 2nd IF signal for WFM mode is passed
through the low-pass filter (L1402, C1402–C1404) via
the mode switch (D802) and then applied to the IF ampli­fier (Q1401). The amplified signal is passed through the
bandpass filter (FI1401) and then applied another IF ampli­fier (Q1402).

• 2nd IF frequency

Mode 2nd IF

USB 456.500 kHz
LSB 453.500 kHz

CW 455.000 kHz

RTTY 454.830 kHz

AM/FM 455.000 kHz

WFM 10.700 MHz

3 - 2

The amplified IF signal is passed through the bandpass filter
(FI1402) and then applied to the WFM demodulator circuit
(IC1401).

3-1-8 3RD MIXER CIRCUIT (MAIN UNIT)

The 3rd mixer circuit mixes the 2nd IF signal with the 3rd LO
signal to convert into the 3rd IF frequency.

The amplified signal from the IF amplifier (Q1001) are mixed
with the 3rd LO signal (438.85 kHz), where come from the
DDS unit via J2406, at the 3rd mixer circuit (IC1101) to con­vert into the 16.15 kHz 3rd IF signal.

The converted 3rd IF signal is applied to the 3rd IF circuit.

3-1-11 DSP CIRCUIT (LOGIC UNIT)

The DSP (Digital Signal Processor) circuit enables digital IF
filter, manual notch, digital twin PBT and phase demodula­tion, etc.

The 3rd IF or demodulated AF (WFM mode) signals are
passed through the low-pass filter (IC451, pins 1, 2) and
then applied to the A/D converter (IC551, pin 4). The con­verted signals are applied to the DSP ICs (IC301, IC2201)
for the digital IF filter, demodulation, automatic notch and
noise reduction, etc.

The output digital audio signals from the DSP IC (IC301) are
applied to the D/A converter (IC551) to convert into the ana­log audio signals.

3-1-9 3RD IF CIRCUIT (MAIN UNIT)

The 3rd IF circuit filters and amplifies the 3rd IF signal.

The converted 3rd IF signal is amplified at the 3rd IF ampli­fier (IC1203, pins 5, 7) and then passed through the low­pass filter (IC1203, pins 1, 3). The filtered signal is passed
through the mode switches (IC1201, pins 1, 7; IC1202, pins
1, 7) and then applied to the analog switch (IC1256, pins 11,

13).

The switched signal is applied to the DSP circuit (LOGIC
unit) via the J2251 (pin 1).

3-1-10 DEMODULATOR CIRCUITS (MAIN UNIT)

• WFM mode

The demodulator circuit converts the 2nd IF signal into the
AF signals.

The filtered signal from the bandpass filter (FI1402) is
applied to the IF amplifier section inside the WFM demodu­lator (IC1401, pin 1) and then applied to the quadrature
detector section to convert into AF signals. The detected AF
signals are output from pin 6 (IC1401) and then applied to
the mode switches (IC1201, pins 1, 7; IC1202, pins 1, 6).

The switched AF signals are applied to the analog
(IC1256, pins 11, 13) and then applied to the DSP circuit
(LOGIC unit) via J2251 (pin 1).

• DSP CIRCUIT

MAIN UNIT

3rd IF
signal

DSPI2

(16.15 kHz)

LOGIC unit

IC451

LPF

converter

switch

A/D

CODEC IC (IC551)

The converted audio signals from the D/A converter (IC551,
pins 25, 26) are passed through the low-pass filter (IC601,
pins 5–7), and then applied to the AF amplifier circuit (MAIN
unit) via J701 (pin 14).

3-1-12 AF AMPLIFIER CIRCUIT (MAIN UNIT)

The AF amplifier amplifies the demodulated AF signals to
drive speaker.

The filtered signal from the low-pass filter (LOGIC unit;
IC601, pins 5–7) are passed through another low-pass filter
(IC2551, pins 1, 3).

While in FM mode, the filtered AF signals from the low-pass
filter (IC2551, pin 1) are applied to the de-emphasis circuit
(IC2551, pins 5–7) to obtain the –6 dB/octave characteristics
and then applied to the AF switch (IC2601, pins 1, 6).

While except FM mode, the filtered AF signals from low-pass
filter (IC2551, pin 1) are applied to the AF switch (IC2601,
pins 1, 7).

The switched AF signals are amplified at the AF power
amplifier (IC2602, pins 1, 4) and then applied to the speaker
switch (Q2602).

The switched signal is applied to the internal speaker that is
connected to J2601 via [EXT SP] jack (J2602).

IC2201

DSP IC

D/A

converter

DSP IC

IC301

IC601

LPF

DSPO2

AF
signals

• AF CIRCUIT

DSPO1

LOGIC UNIT

IC2551

3

MAIN UNIT

LPF

IC2551

15

emphasis

De-

7

3 - 3

IC2601

6

7

6

1

AF amp.

IC2602

AF

Q2602

6

6

[EXT SP]

SP1

CHASSIS

3-1-13 AGC CIRCUIT (MAIN UNIT)

The AGC (Automatic Gain Control) circuit adjusts IF amplify
gain to keep the audio output at a constant level. The
receiver gain is determined by the voltage on the AGC line
from the DSP circuit.

The AGC voltage is detected at the AGC detector section
inside the DSP ICs (LOGIC unit; IC301, IC2201) and the
AGC voltage is applied to the D/A converter (IC2155). The
converted AGC voltage is applied to the IF amplifiers (Q702,
Q902, Q1001) after being amplified at IC1201 (pin 12) and
sets the receiver gain with [RF/SQL] control.

When receiving strong signals, the detected voltage increas­es and the AGC voltage decreases. As the AGC voltage is
used for the bias voltage of the IF amplifiers (Q702, Q902,
Q1001), IF amplifier gain is decreased.

3-1-14 S-METER CIRCUIT (LOGIC UNIT)

The S-meter circuit indicates the relative received signal
strength while receiving.

The received signal strength is detected inside the DSP ICs
(IC301, IC2201) and then applied to the main CPU (IC1302).

The S-meter signal for WFM mode is output from the FM
detector IC (IC401, pin 4) and then applied to the to the
main CPU (IC1302, pin 123).

3-2 TRANSMITTER CIRCUITS

3-2-1 MICROPHONE AMPLIFIER CIRCUIT (MAIN UNIT)

The microphone amplifier circuit amplifies microphone audio
signal to a level needed for the DSP circuit.

Audio signals from the [MIC] connector (FRONT unit; J303
or MAIN unit; J2003) are amplified at the microphone ampli­fier (IC2007, pins 1, 2) and then applied to the DSP circuit
(LOGIC unit) via J2251 (pin 3).

3-2-2 DSP CIRCUIT (LOGIC UNIT)

The DSP (Digital Signal Processor) circuit enables digital
PSN modulator, digital Low Power modulator, digital Phase
modulator, transmitter monitor and side tone, etc.

The amplified microphone signals are passed through the
low-pass filter (IC502, pins 1, 2) and then applied to the A/D
converter (IC551, pin 3). The converted digital audio signal
are applied to the DSP ICs (IC301, IC2201) to covert into
the modulated 16.15 kHz 3rd IF signal. The modulated 3rd
IF signal from the DSP IC (IC301) is applied to the D/A con­vertor (IC551) to convert into the analog 3rd IF signal. The
converted analog 3rd IF signal is output from pins 27, 28
(IC551) and then passed through the low-pass filter (IC601,
pins 1–3).

The filtered IF signal is applied to the 3rd mixer circuit (MAIN
unit) via the J701 (pin 12).

The S-meter signal from the main CPU (IC1302) is applied
to the sub CPU (DISPLAY unit; IC2003) and is then dis­played on the LCD display.

3-1-15 SQUELCH CIRCUIT (MAIN UNIT)

The squelch circuit mutes audio output when the S-meter
signal is lower than the [RF/SQL] control setting level.

The S-meter signal from the DSP IC is applied to the main
CPU (LOGIC unit; IC1302) and is compared with the thresh­old level set by the [RF/SQL] control. The [RF/SQL] setting
is picked up at the sub CPU (DISPLAY unit; IC2003, pin 74).
The main CPU (LOGIC unit; IC1302) compares the S-meter
signal and [RF/SQL] setting, and outputs the mute signal via
the DSP IC (IC301, pin B4) to the AF switch (IC2601, pin 2)
to cut AF signals via Q2607.

While receiving WFM mode, the S-meter signal is output
from the WFM demodulator (IC401, pin 4) and applied to the
to the main CPU (LOGIC unit; IC1302, pin 123). The main
CPU (LOGIC unit; IC1302) compares the S-meter signal and
[RF/SQL] setting, and outputs the mute signal via the DSP
IC (IC301, pin B4) to the AF switch (IC2601, pin 2) to cut AF

signals via Q2607.

• AGC CIRCUIT

DSPI1

IC1203

amp.

IF

3rd mixer

Q1001

amp.

IF

3-2-3 3RD MIXER CIRCUIT (MAIN UNIT)

The 3rd mixer circuit mixes the 3rd IF signal with the 3rd LO
signal to convert into the 2nd IF frequency.

The filtered signal from the low-pass filter (LOGIC unit;
IC601) is applied to the analog switch (IC2251, pins 1,

7) and then applied to the 3rd mixer circuit (IC1301, pins
3, 5). The applied signal is mixed with the 3rd LO signal
(438.85 kHz) coming from DDS unit via J2406 (pin 13) and
converted into the 455 kHz 2nd IF signal.

The converted 2nd IF signal is applied to the 2nd IF circuit.

3-2-4 2ND IF CIRCUIT (MAIN UNIT)

The 2nd IF circuit filters and amplifies the 2nd IF signal.

The converted 2nd IF signal is applied to the 2nd IF ampli­fier (Q901) and then passed through the bandpass filter
(FI901) via the TX switch (D903) to suppress unwanted sig­nals.

The filtered signal is applied to the 2nd mixer circuit.

Q902

amp.

IF

2nd mixer

Q702

amp.

Q502

IF

amp.

IF

1st mixer

From the
antenna

DSP

CIRCUIT

IC301

IC2201

IC2155

D/A
converter

12

12

IC2101

AGC

14

3 - 4

3-2-5 2ND MIXER CIRCUIT (MAIN UNIT)

The 2nd mixer circuit mixes the 2nd IF signal with the 2nd
LO signal to convert into the 1st IF frequency.

3-2-8 RF CIRCUIT (MAIN UNIT)

The RF circuit amplifies and filters the RF signal from the
1st mixer circuit.

The filtered signal from the bandpass filter (FI901) is applied
to the 2nd mixer circuit (D801) and mixed with 2nd LO sig­nal (124.032 MHz) to convert into the 1st IF signal.

The 2nd LO signal is generated in the DDS unit, and applied
to the 2nd mixer circuit (D801) after being filtered and
attenuated at the low-pass filter (L808, C816, C817) and the
attenuators (R801, R805, R806, R809–R811), respectively.

The converted 1st IF signal is applied to the 1st IF circuit.

3-2-6 1ST IF CIRCUIT (MAIN UNIT)

The 1st IF circuit amplifies and filters the 1st IF signal.

The converted 1st IF signal is applied to the IF amplifier
(Q701) via the TX switch (D703) and then passed through
the bandpass filter (FI601) to suppress unwanted signals via
the filter switches (D601, D602).

The filtered signals are applied to the 1st mixer circuit.

3-2-7 1ST MIXER CIRCUIT (MAIN UNIT)

The 1st mixer circuit mixes the 1st IF signal with the 1st LO
signal to convert into the RF frequency.

The filtered signal is applied to the 1st mixer circuit (IC401)
via the TX switches (D501, D504) and mixed with the 1st LO
signal (124.517–594.487 MHz) to convert into the RF signal.

The 1st LO signal is generated in the DDS unit, and applied
to the 1st mixer circuit (IC401, pins 1, 6) after being ampli­fied and attenuated at the 1st LO amplifier (IC421, pins 1, 4)
and the attenuators (R416–R418, R421–R423), respectively.

The converted RF signal is applied to the RF circuit.

The HF/50 MHz bands signal from the 1st mixer circuit
(IC401) is passed through the low-pass filter (L310, L312,
C314, C316, C318, C320, C322) via the band switch (D305).

The HF band signal is passed through one of 5 high-pass
(Refer to 3-1 for used RF high-pass filter) and low-pass
(L205, L207, C209–C213) filters.

The 50 MHz band signal is passed through the bandpass
filter (L219, L220, L246–L248, C240–C242, C282, C285–
C291).

The filtered HF/50 MHz bands signal is amplified at the YGR
amplifier (IC1) after passed through the high-pass filter (L109,
L110, L116, L117, C109, C114–C116) and attenuator (R5–
R7).

The amplified HF/50 MHz bands signal is applied to the
drive and power amplifier circuits (PA unit) via J1.

The VHF/UHF bands signal from the 1st mixer circuit (IC401)
is passed through the low-pass filter (L309, L311, L313,
C313, C315, C317, C319, C321, C323, C325) via the band
switch (D306).

The VHF band signal is passed through the bandpass filter
(L8, L10–L13, C18, C25, C26, C28, C29, C31–C33) via
the band switches (D3, D10) and then amplified at the RF
amplifier (IC2, pins 1, 3). The amplified signal is passed
through the band switch (D1) and attenuator (R5–R7), and
then applied to the YGR amplifier (IC1, pins 1, 4).

The amplified signal is passed through the high pass filter
(L21, C50–C52) via the filter switches (D6, D8) and then
applied to the drive and power amplifier circuits (PA unit) via
J1.

The UHF band signal is amplified at the RF amplifier (IC3,
pins 1, 3) via the band switch (D4) and passed through the
bandpass filters (FI2, FI3). The filtered signal is amplified at
the YGR amplifier (IC1, pins 1, 4) after passed through the
band switch (D2), attenuator (R5–R7) and bypass switches
(D7, D9).

• TRANSMITTER CONSTRUCTION

LOGIC UNIT (DSP circuit)

MIC

Controller

Q801

AMP.

MAIN UNIT

A/D

IC551

FI601
Crystal

BPF

594.487 MHz)

DSP
ICs

IC301
IC2201

1st mixer

IC401

1st LO

(124.517−

D/A

IC551

HPFs

BPF

The amplified signal is applied to the drive and power ampli­fier circuits (PA unit) via J1.

3rd LO

(438.85 kHz)

455 kHz

3 - 5

AMP.

IC504

DRIVER
UNIT

Q901

AMP.

124.487 MHz

HF/50 MHz

145 MHz

430 MHz

FI901

Ceramic

PA UNIT

PA

BPF

PA

(124.032 MHz)

2nd mixer

Q301
Q302

Q501

Q401

PA

2nd LO

D801

LPFs

ANT1

ANT2

3-2-9 DRIVE AND POWER AMPLIFIER CIRCUITS

(PA AND DRIVER UNITS)

The drive and power amplifier circuits amplify the RF signal
from the RF circuit (MAIN unit) to obtain 100 W of RF output
power for the HF/50 MHz bands, 50 W for the VHF band
and 35 W for the UHF band.

The VHF and UHF RF power amplified signal from the
power amplifiers (PA unit; Q401, Q501) are detected at the
APC detectors (PA unit; D401, D404, D501, D504) respec­tively. The detected voltages ("VFOR" and "UFOR") are
combined to "VUFOR" voltage and then applied to the MAIN
unit.

The RF signal from the MAIN unit is applied to the pre drive
amplifiers (PA unit; Q101, Q102) after passed through the
attenuator (PA unit; R101–R103). The amplified signal is
applied to the drive amplifier (DRIVER unit; Q504) to amplify
a level needed for the power amplifiers.

The amplified HF/50 MHz bands signal from the drive ampli­fier is amplified at the power amplifiers (PA unit; Q301,
Q302) to obtain a stable 100 W of RF output power. The
power amplified signal is passed through the TX/RX switch
(RL801), one of the 7 low-pass filters, APC detector (PA
unit; D961, D962) and then applied to the [ANT1] connector
(CHASSIS; J1).

The amplified VHF RF signal from the drive amplifier is
amplified at the power amplifier (Q501) to obtain a stable
50 W of RF output power. The power amplified signals are
applied to the low-pass filter, APC detector (D501–D504),
TX/RX switch (D506, D510), low-pass filters (L506, L508,
L510, L601–L603, C516, C519, C521, C601, C602) and
[ANT2] connector (CHASSIS; J2).

The amplified UHF RF signal from the drive amplifier is
amplified at the power amplifier (Q401) to obtain a stable
35 W of RF output power. The power amplified signal is
applied to the low-pass filter, APC detector (D401–D404),
TX/RX switch (D406, D407), high-pass filter (L413, L414,
C428, C429, C431, C433), low-pass filter (L601–L603,
C601, C602) and [ANT2] connector (CHASSIS; J2).

3-2-10 ALC CIRCUIT (MAIN UNIT)

The ALC (Automatic Level Control) circuit reduces the gain
of IF amplifiers in order for the transceiver to output a con­stant RF power set by the RF power setting even when the
supplied voltage shifts, etc.

The “HFOR” and “VUFOR” voltages are combined to the
“FORL” voltage and then applied to the ALC amplifier
(IC1601, pins 1, 2). The “POCV” voltage from the D/A con­verter (IC2155, pin 19) via the buffer amplifier (IC2101,
pins 5, 7), determined by the RF power setting, is applied to
the ALC amplifier (IC1601, pin 3) as the reference voltage.

When the “FORL” voltage exceeds the “POCV” voltage, ALC
bias voltage from IC1601 (pin 1) controls the IF amplifiers
(Q701, Q901). This adjusts the output power to the level
determined by the RF power setting until the “FORL” and
“POCV” voltages are equalized.

In AM mode, IC1601 functions as an averaging ALC ampli­fier with Q1601. The AM switch (Q1602) is turn ON and
shifts the “POCV” voltage to adjust the TX output power for
the AM mode (maximum; 40 W for HF/50 MHz bands, 20 W
for VHF band, 14 W for UHF band).

The ALC bias voltage from IC1601 is also applied to the
main CPU (LOGIC unit; IC1302, pin 115) as the “ALCL” volt­age for ALC meter indication.

The external ALC input (negative voltage) from the [ACC]
socket (pin 6) is converted to a positive voltage at D1609
and is applied to the buffer amplifier (Q1604). External ALC
operation is identical to that of the internal ALC.

3-2-11 APC CIRCUIT (MAIN UNIT)

The APC (Automatic Power Control) circuit protects the
power amplifiers on the PA unit from high SWR and exces­sive current.

The reflected wave signal appears and increases on the
antenna connector when the antenna is mismatched.

The HF/50 MHz power amplified signal from the power
amplifiers (PA unit; Q301, Q302) is detected at the APC
detector (PA unit; D961). The detected voltage is applied
to the buffer amplifier (PA unit; IC960, pins 5, 7) and then
applied to the MAIN unit as the “HFOR” voltage.

• ALC CIRCUIT

TX
signals

3rd mixer 2nd mixer 1st mixer

Crystal

BPF

FI601

ALC amplifier

ALC

Q901

IF

IF

Q701

HPFs LPFs

BPF

1

ALC

IC1601

The HF/50 MHz reflected signal level is detected at D962 (PA
unit), and is amplified at the buffer amplifier (PA unit; IC960,
pins 1, 3) and applied to the ALC amplifier (IC1601, pins 8, 9)
as the "HREF" voltage.

ANT1

2

AMP PA

DRIVER

UNIT

HF/50 MHz

145 MHz

PA

430 MHz

PA

PA UNIT

APC
DET

APC
DET

APC
DET

3 - 6

ANT2

The VHF/UHF APC detector circuits (PA unit; D501, D504,
D401, D404) detect the forward and reflection signals and
convert into DC voltages. The converted DC voltages are
combined and applied to the ALC amplifier (pins 1, 2) as
"VUFOR" voltage.

For the current APC, the driving current at the power ampli­fiers is detected in the voltages (“ICH” and “ICL”) which
appear at both terminals of detector resistors (PA unit; R721,
R722). The detected voltages are applied to the APC ampli­fier (IC1601, pins 5–7).

When the current of the power amplifier exceeds 22 A, The
output voltage from the APC amplifier (IC1601, pin 7) con­trols the ALC line to prevent excessive current flow.

3-2-12 RF, ALC, SWR METER CIRCUITS (LOGIC UNIT)

While transmitting, RF, ALC or SWR meter readings are
available and can be selected with the [F3 (MET)] switch.

(1) Power meter

The “FOR,” “VFOR” and “UFOR” voltages are combined to
the “FORL” voltage, and it is then applied to the main CPU
(IC1302, pin 113) for indicating the TX output power.

(2) ALC meter

The ALC bias voltage from the buffer amplifier (MAIN unit;
IC1601, pin 14) is applied to the main CPU (IC1302, pin 115)
via the “ALCL” signal line for indicating the ALC level.

3-3 DDS CIRCUITS

3-3-1 GENERAL

The DDS unit generates a 1st LO (124.517–594.487 MHz),
a 2nd LO (124.032 MHz) and a 3rd LO (438.85 kHz) fre­quencies.

3-3-2 1ST LO CIRCUIT (DDS UNIT)

The 1st LO circuit generates a 1st LO signal based on the
system clock that is tripled the 2nd LO frequency.

The 124.032 MHz 2nd LO signal is applied to the tripler
circuit (Q201) and then passed through the high-pass filter
(L205, L206, L210, C206–C210, C217–C219). The filtered
signal is amplified at Q211 and then passed through the
bandpass filter (FI201). The filtered signal is applied to the
DDS IC (IC301) as the 372.096 MHz system clock. The
DDS IC generates 38.62189–199.999999 MHz frequency
based on the system clock. The output signal from the DDS
IC (IC301, pins 20, 21) is applied to the doubler circuit
(D301) and then amplified at IC401 (pins 1, 4) after being
passed through the low-pass filter (L331, L332, C331, C332,
C335). The amplified signal is applied to one of the multiplier
circuits which is selected from the readout frequency and
then amplified at IC451 (pins 1, 5). The amplified signal is
passed through the bandpass filters.

The filtered signal is applied to the 1st mixer circuit (MAIN
unit) via J851.

(3) SWR meter

The “FORL” and “REFL” voltages are applied to the main
CPU (IC1302, pins 113, 114) respectively. The main CPU
compares the ratio of “FORL” to “REFL” voltage and indi­cates the SWR for the [ANT1] connector.

• FREQUENCY CONSTRUCTION

[ANT1]

0.03–
60 MHz

[ANT2]

60–
470 MHz

1st mixer

IC401

1st IF: 124.487 MHz

(WFM: 134.732 MHz)

124.517–

594.487 MHz
(1st LO)

MAIN UNIT

DDS UNIT

BPF

124.517–

154.486999 MHz

301

×2

×2

D456

×4

D471

DDS

IC301

372.096 MHz
(system clock)

BPF

154.487–

324.486999 MHz

BPF

524.487–

594.487 MHz

BPF

FI201

×3

Q201

2nd mixer

D801

124.032 MHz

BPF

×5

to WFM detector

(IC1401)

2nd IF: 455 kHz

(2nd LO)

FI101

Q101

AMP.

IC61

AMP.

Q1

3rd mixer

IC1101

LPF

DDS

Ref. Osc.

24.8064 MHz

X1

3rd IF: 16.15 kHz

to DSP circuit

438.85 kHz
(3rd LO)

IC51

24.8064 MHz
(system clock)

3 - 7

3-3-3 2ND LO AND REFERENCE OSCILLATOR

CIRCUITS (DDS UNIT)

The reference oscillator (X1, Q1) generates a 24.8064 MHz
frequency used for the 1st LO, 3rd LO and DSP circuits as a
system clock and for the 2nd LO signal.

The oscillated signal is multiplied by 5 at Q101 and then
passed through the bandpass filter (FI101). The filtered

124.032 MHz signal is amplified at Q151 and then applied to
the 2nd mixer circuit (MAIN unit) after being passed through
the low-pass filter (L153, C154–C156) and attenuator (R157
–R159) via J151 as the 2nd LO signal.

3-3-4 3RD LO CIRCUIT (DDS UNIT)

The 3rd LO circuit generates a 3rd LO signal and shift the
frequency for the operating mode needed.

The DDS IC (IC51) generates a 10-bit digital signal. The

24.8064 MHz system clock signal from the reference oscil­lator (X1, Q1) is buffer amplified at IC61 (pins 2, 4) and then
applied to DDS IC (IC51, pins 5, 10). The DDS IC (IC51)
generates the 438.85 kHz frequency signal and then output
from pin 10. The output signal is applied to the low-pass fil­ter (L53, C59–C61) and then applied to the 3rd mixer circuit
(MAIN unit) via J952 (pin 13) as the 3rd LO signal.

• 3RD LO FREQUENCY

Mode

USB 440.350 440.350

LSB 437.350 437.350

CW

CW-R

RTTY 436.555* 436.555*

RTTY-R 440.975* 436.555*

AM 438.850 438.850
FM 438.850 438.850

RX frequency

[kHz]

438.850

(–CW PITCH)

438.850

(+CW PITCH)

*RTTY TONE: 2125 Hz, RTTY SHIFT: 170 Hz

TX frequency

[kHz]

438.850

438.850

3-4 LOGIC CIRCUITS

3-4-1 BAND SELECTION DATA

IC2151
(MAIN)

Frequency

[MHz]

0.03–1.599999 B0

1.6–1.999999 B1

2.0–3.399999 B2

3.4–3.999999

4.0–6.899999

6.9–7.300000

7.300001–7.999999

8.0–10.999999

11.0–13.899999

13.9–14.350000

14.350001–

14.999999

15.0–20.899999

20.9–21.45

21.450001–

21.999999

22.0–29.999999

30.0–49.999999

54.000001–

59.999999

60.0–115.512999

115.513–

128.999999

129.0-148.0

148.000001–

199.999999

400.0–470.0 L9 L9 LOF6

IC2152
(MAIN)

HPF

(MAIN)

B3

B4

B5

B6

T: B1
R: B7

T: B1
R: B7

L8 L8

IC2152
(MAIN)

IC981

(PA)

LPF (PA)

L1

L2

L3

L4

L5

L6

L7 LOF250.0–54.0 B7

IC901
(DDS)

LOF

(DDS)

LOF1

LOF3

LOF4

LOF5

3-5 POWER SUPPLY CIRCUITS

3-5-1 FRONT UNIT VOLTAGE LINE

Line Description

Common 3.3 V converted from the 5 V line

3.3 V

5 V

3 - 8

by the 3.3 V regulator circuit (IC151). The out­put voltage is applied to the sub CPU (IC2003),
etc.

Common 5 V converted from the 8 V line by
the 5 V regulator circuit (IC101). The output
voltage is applied to the LCD driver (IC506),
etc.

3-5-2 MAIN UNIT VOLTAGE LINE

Line Description

Common 3.3 V converted from the 5 V line

3.3 V

5 V

8 V

T8

R8

by the 3.3 V regulator circuit (IC1801). The
output voltage is applied to the D/A convert­er ICs (IC2151–IC5155), etc.

Common 5 V converted from the H V line by
the 5 V regulator circuit (IC1951). The output
voltage is applied to the CODEC IC (LOGIC
unit; IC551), low-pass filters (LOGIC unit;
IC451, IC502), etc.

Common 8 V line converted from the HV
line by the 8 V regulator circuit (IC1901).
The output voltage is applied to the buffer
amplifiers (IC2101–IC2103), analog switches
(IC2156, IC2251), etc.

Transmit 8 V controlled by the T8 regulator
circuit (Q1703, Q1704) using TXS signal
from the CPU (LOGIC unit; IC1302, pin

106). The output voltage is applied to the RF
switch (Q101), 2nd IF amplifier (Q701), 3rd
IF amplifier (Q901), etc.

Receive 8 V controlled by the R8 regulator
circuit (Q1701, Q1702) using RXS signal
from the CPU (LOGIC unit; IC1302, pin 105).
The output voltage is applied to the 2nd IF
amplifier (Q702), 3rd IF amplifier (Q1001),
3rd mixer (Q1101), etc.

3-6 PORT ALLOCATIONS

3-6-1 SUB-CPU (DISPLAY UNIT; IC2003)

Pin

number

3, 5

13, 14

15, 16

21 VRK Input port for [AF] switch.

22 PBTK Input port for [PBT/M-ch] switch.

23 TUNK Input port for [TUNER/CALL] key.

24 TSK Input port for [TS] key.

25 LCKK Input port for [LOCK] key.

26 BUPK Input port for [Y(BAND)] key.

27 BDNK Input port for [Z(BAND)] key.

28 FMSL

35 PHNK

37 LCK

Port

name

MDBK,

MDAK

S1AK,

S1BK

S2AK,

S2BK

Description

Input ports for [DIAL].

Input ports for [PBT2/M-ch] control.

Input ports for [PBT1/RIT] control.

Input port for the HM-151 connection
detection.

Input port for the headphones
connection detection.

Outputs clock signal for the LCD driv­er (IC506).

Pin

number

38 LDT

39 LDST

47 FSQS

48 RXD

54 BLV

55 KLV

56 TXD

57 PBT1D

58 PBT2D

70 LRXD

71 LTXD

73 AFGL Input port for [AF] control.

74 SQLL Input port for [RF/SQL] control.

75 PTTL

77 FUDL

78 KI0L

79 KI1L

80 KI2L

Port

name

Description

Outputs data signal for the LCD driver
(IC506).

Outputs strobe signal for the LCD
driver (IC506).

Outputs the squelch control signal.
High : Squelch is opened.

Outputs the RX LED control signal.
High : While receiving or squelch is

opened.

Outputs the dimmer control signal for
the LCD backlights.

Outputs the dimmer control signal for
the key backlights.

Outputs TX LED control signal.
Low : While transmitting.

Outputs control signal for [PBT/M-ch/
RIT] indicator.
Low : While the RIT function is ON.

Outputs control signal for [PBT/M-ch/
RIT] indicator.
Low : While the PBT function is ON.

Input port for data signal from the
main CPU (LOGIC unit; IC1302).

Outputs data signal to the main CPU
(LOGIC unit; IC1302).

Input port for PTT control signal from
the microphone that is connected to
the FRONT unit.

Input port for [UP] and [DN] switch­es from the optional microphone
(HM-103, SM-20) that is connected to
the FRONT [MIC] connector.

Input port for [MODE], [P.AMP/ATT],
[Y(MENU/GRP)] and [Z(MENU/
GRP)] keys.

Input port for [F-1], [F-2], [F-3] and
[F-4] keys.

Input port for [NB LEV], [NR LEV], [N/
ANF] and [SET/REC] keys.

3 - 9

3-6-2 MAIN CPU (LOGIC UNIT; IC1302)

Pin

number

26 CYDT

27 CYCK

29 RTCDT

30 RTCCK

42 LOST

43 MST

46 MMDK

47 DRES

48 PRES#

49 SQSS

51 MCK

52 MDT

57 SDSS

58 TDAT

81 DTXD

82 DRXD

83 2T8V

104 4T8V

105 RXS

106 TXS

107 POWS

Port

name

Description

Outputs data signal for the clock gen­erator (IC1201) for display control.

Outputs clock signal for the clock gen­erator (IC1201) for display control.

I/O port for the data signal from/to the
clock IC (IC1304) for clock indication
and timer function.

Outputs clock signal for the clock IC
(IC1304) for clock indication and timer
function.

Outputs strobe signal for the D/A con­verter (DDS unit; IC901).

Outputs strobe signal for the D/A
converter ICs (MAIN unit; IC2151–
IC2154).

Input port for the data signal from the
microphone that is connected to the
rear [MIC] connector.

Outputs the reset signal for the DSP
ICs (IC301, IC2201).

Outputs the reset signal for the LCD
controller (IC1226) and DDS IC (DDS
unit; IC301).

Outputs the squelch control signal for
the ACC connector and connected
microphone.

Outputs clock signal for the D/A
converter ICs (MAIN unit; IC2151–
IC2154).

Outputs serial data signal for the D/A
converter ICs (MAIN unit; IC2151–
IC2154).

Outputs the signal for H SEND or V
SEND selection.
High : While V SEND is selected.

• Outputs data signal for AT-180.

• Outputs start signal for AH-3/AH-4.

Outputs data signal for the DSP IC
(IC301).

Input port for data signal from the
DSP IC (IC301).

Outputs the TX band signal.
High : While transmitting the 144 MHz

band.

Outputs the TX band signal.
High: While transmitting the 430 MHz

band.

Outputs R8 regulator (Q1701, Q1702)
control signal.
Low : While receiving.

Outputs T8 regulator (Q1703, Q1704)
control signal.
Low :While transmitting.

Outputs the power control signal .
High :When IC-7000 is power ON.

Pin

number

109 ECK

110 EDT I/O port for the EEPROM (IC1301).

113 FORL Input port for the forward voltage.

114 REFL Input port for the refl ection voltage .

115 ALCL Input port for ALC level.

116 SNDL

117 DPTL

118 THML

119 MUDL

121,

122

124 MMSL

127 TKEY Input port for tuner ON.

128 TRD

133 LTXD

134 LRXD

135 PWRK

137 3DST

138 PCK

140 1DST

142 PDT

Port name Description

Outputs clock signal to the EE­PROM (IC1301).

Input port for PTT control signal
from the FRONT unit or ACC con­nector.

Input port for PTT control signal
from the DATA connector.

Input port for the temperature de­tection signal.

Input port for [UP] and [DN] switch­es from the optional microphone
(HM-103, SM-20) that is connected
to the rear [MIC] connector.

DASK,

DOTK

Input ports for [KEY] jack.

Input port for the HM-151 connec­tion detection.

Input port for the detected signal for
the tuner unit connection.

Outputs data signal to the sub CPU
(DISPLAY unit; IC2003).

Inputs data signal from the sub
CPU (DISPLAY unit; IC2003).

Input port for [PWR] key.
Low : While [PWR] key is pushed.

Outputs strobe signal to the DDS
IC (DDS unit; IC51) for the 3rd LO
signal.

Outputs clock signal for the DDS
ICs (DDS unit; IC51, IC301) and
D/A converter (DDS unit; IC901).

Output strobe signal to the DDS IC
(DDS unit; IC301) for the 1st LO
signal.

Outputs serial data signal for the
DDS ICs (DDS unit; IC51, IC301)
and D/A converter (DDS unit;
IC901).

3 - 10

SECTION 4 ADJUSTMENT PROCEDURES

4-1 PREPARATION

Some adjustment must be performed on the adjustment mode.

M REQUIRED TEST EQUIPMENT

EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RENGE

DC power supply

RF power meter
(treminated type)

Frequency counter

RF voltmeter

Standard signal
generator (SSG)

Output voltage : 13.8 V DC
Current capacity : 30 A or more

Measuring range : 0.5–200 W
Frequency range : 1.8–500 MHz
Impedance : 50 Ω
SWR : 1.2 : 1 or better

Frequency range : 0.1–500 MHz
Frequency accuracy : ±1 ppm or better
Sensitivity : 100 mV or better

Frequency range : 0.1–500 MHz
Measuring range : 0.01–10 V

Frequency range : 0.1–500 MHz
Output level : 0.1 µV to 32 mV

(–127 to –17 dBm)

Distortion meter

Oscilloscope

Digital multimeter Imput impeadance : 10 MΩ/DC or more

AC millivoltmeter Measuring range : 10 mV to 10 V

DC voltmeter Input impedance : 50 kΩ/V DC or more

DC ammeter Measuring capability : 5 A/30 A

Audio generator

External speaker

M ENTERING THE ADJUSTMENT MODE

q Turn the transceiver’s power OFF.
w Connect the JIG plug (see illustration below) to [REMOTE] jack on the rear panel.
e While pushing and holding [P.AMP/ATT] and [TUNE/CALL], turn the transceiver power ON.

Frequency range : 1 kHz ±10 %
Measuring range : 1–100 %

Frequency range : DC–100 MHz
Measuring range : 0.01–10 V

Frequency range : 300–3000 Hz
Measuring range : 1–500 mV

Input impedance : 8 Ω
Capacity : 5 W or more

NOTE: Exiting from the adjustment mode when the transceiver's power is OFF.

[P.AMP/ATT]

Front panel

[TUNER/CALL]

[PWR]

M

OPERATING ON THE ADJUSTMENT MODE

• Enter DDS adjustment mode. : Push [F-1 (REF)]

• Enter TX adjustment mode. : Push [F-2 (TX)]

• Enter RX adjustment mode. : Push [F-3 (RX)]

• Store the set value. : Push [F-4 (SET)]

• Adjust the value. : Rotate [DIAL]

KEY ACC DATA

to [REMOTE] jack

Rear panel

2-conductor 3.5 (d) mm (1⁄8″) plug

MIC

GND

ANT2 ANT1

DC 13.8V

Shorten the both terminals

JIG plug

[DIAL]

CAUTION:

Connect a dummy load to the antenna con-

nectors during the transmitter adjustment,
when the adjustment condition does not re­quire a test equipment.

4 - 1

[F-1(REF)]

[F-2 (TX)]

[F-3 (RX)]

[F-4 (SET)]

• CONNECTION

• Microphone connector (Rear panel view)

NOTE! Connect the test equipment to the
micropho0ne connector on the rear panel,
otherwise the transmitter adjustment will not
adjusted properly.

AC
millivoltmeter

to [EXT SP]

Pin 5

MIC GND

Pin 6
MIC INPUT

18

DC power supply

AA13.8 V/30 A

Pin 7
GND

–

Audio

+

generator

+

–

Millivoltmerter

Pin 4
PTT

Ammeter
5 A, 30 A

to [MIC]

to [DC 13.8 V]

to [ANT 1/2]

Speaker

RF power meter

A200 W/50 Ω

Frequency counter

Standard signal

aagenerator

CAUTION!

DO NOT connect the

signal generator while
transmitting.

4 - 2

4-2 DDS ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

REFERENCE
FREQUENCY

1 • Enter the adjustment mode.

• Push [F1 (REF)].

2• Disconnect P4 from J801 (MAIN

unit).

• Receiving

After the adjustment, exit the adjustment mode and connect P4 to J801 (MAIN unit).

4-3 DISPLAY ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION

DISPLAY 1 • Connect between DISPLAY unit

ground and MAIN unit ground.

• Disconnect J2231 (MAIN unit).

• Receiving

2 • Receiving Connect a frequency

After the adjustment, connect J2231 (MAIN unit) and disconnect jumper wire between DISPLAY unit ground
and MAIN unit ground.

REF OSC

MEASUREMENT

UNIT LOCATION UNIT ADJUST

DIS-

PLAY

Connect a frequency
counter to CP536
through a capacitor
(0.0047 µF) and resistor
(1 kΩ) in series.

counter to CP505.

Connect a frequency counter to P4 and
set 124.032000 MHz using [DIAL]. Then
push [F-4 (SET)].

VALUE

3.579545 MHz
[USA]

4.433619 MHz

[Others]

15.734 kHz
[USA]

15.625 kHz

[Others]

ADJUSTMENT

DIS-

PLAY

DIS-

PLAY

C536

R541

4-4 TRANSMITTER ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

DRIVE/FINAL
IDLING
CURRENT

1 • Enter the adjustment mode.

• Push [F-2 (TX)].

2• Connect an RF power meter to

[ANT1] and [ANT2] connectors.

• Apply no audio signals to [MIC]

3 Rotate [DIAL] to set adjustment value to

jack.

• Connect a DC ammeter (5 A
type) between power supply and

4

transceiver.

• Transmitting

5 Rotate [DIAL] to set adjustment value to

6

7 Rotate [DIAL] to set adjustment value to

8

9 Rotate [DIAL] to set adjustment value to

10

11 Rotate [DIAL] to set adjustment value to

After the adjustment, exit the adjustment mode.

Driver Idle Cur

Final Idle Cur(HF/50M)-1

Final Idle Cur(HF/50M)-2

Final Idle Cur(144M)

Final Idle Cur(430M)

Preset the adjustment value to "00" using
with [DIAL], and check the driving current.

1 A value from the driving current of "00"
value. Then push [F-4 (SET )].

Preset the adjustment value to "00" using
with [DIAL], and check the driving current.

1 A value from the driving current of "00"
value. Then push [F-4 (SET )].

Preset the adjustment value to "00" using
with [DIAL], and check the driving current.

1 A value from the driving current of "00"
value. Then push [F-4 (SET )].

Preset the adjustment value to "00" using
with [DIAL], and check the driving current.

2 A value from the driving current of "00"
value. Then push [F-4 (SET )].

Preset the adjustment value to "00" using
with [DIAL], and check the driving current.

2.5 A value from the driving current of
"00" value. Then push [F-4 (SET )].

4 - 3

• MAIN UNIT

Rear panel view

J2231

Display adjustment
presetting

Ammeter

DC power

supply

J801

P4

Reference frequency
check point

• FRONT UNIT

0.0047µF

1kΩ

CP536
Display check point

C536
Display adjustment point

Display check point

Frequency

counter

R541
Display adjustment point

CP505

4 - 4

4-4 TRANSMITTER ADJUSTMENT (continue)

ADJUSTMENT ADJUSTMENT CONDITION

SWR
DETECTOR

TX PEAK 1 REAR

1 • Operating freq : 10.10000 MHz

• MODE : USB

• RF Power : 100%

• MIC Gain : 50%

2 PA Connect a DC voltmeter

• Connect an audio generator to
[MIC] connector and set as;

Frequency : 1.5 kHz

• Connect a wire between CP1601
(MAIN unit) and ground.

• Transmitting

After adjustment, disconnect the wire between CP1601 (MAIN unit) and ground.

• Operating freq. : 10.10000 MHz

• MODE : USB

• RF Power : 100%

• MIC Gain : 50%

• Preset R1618 (MAIN

unit) as the illustration at
right.

• Preset L604, L612

and L904 (MAIN
unit) as the illustra­tion at right.

• Connect an audio generator to

[MIC] connector and set as ;
Level : 1.5 kHz/3 mV
( Adjust the audio generator

output level to keep less than
50 W output power.)

• Transmitting

Core’s
top

UNIT LOCATION UNIT ADJUST

REAR

panel

panel

MEASUREMENT

Connect an RF power
meter to [ANT1] connec­tor.

to CP961.

Connect an RF power
meter to [ANT1] connec­tor.

VALUE

80 W Audio

Minimum volt­age

Maximum out­put power

ADJUSTMENT

genera-

tor

PA C964

MAIN L701

Output

level

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

TX TOTAL
GAIN

1 • Enter the adjustment mode.

• Push [F-2 (TX)].

2• Connect an RF power meter to

[ANT1] connector.

• Connect an audio generator to

3

[MIC] connector and set as;

Level : 1.5 kHz/3 mV

4

• Transmitting

5

6• Connect an RF power to [ANT2]

connector.

• Transmitting

7

TX Total Gain(HF1)

TX Total Gain(HF2)

TX Total Gain(HF3)

TX Total Gain(50M)

TX Total Gain(144M)

TX Total Gain(430M)

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 25 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 17.5 W using
[DIAL]. Then push [F-4 (SET)].

4 - 5

• MAIN UNIT

R1618

TX peak adjustment point

CP1601

SWR DETECTOR preset point

L904

L701
L604

L612

TX peak
adjustment point

• PA UNIT

CP961

SWR DETECTOR
check point

C964

SWR DETECTOR
adjustment point

4 - 6

4-4 TRANSMITTER ADJUSTMENT (Continue)

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

TX OUTPUT
POWER (HF)

APC (HF) 1

TX OUTPUT
POWER (AM)

TX OUTPUT
POWER
(50 MHz)

1• Connect an RF power meter to

[ANT1] connector.

• Connect an audio generator to

2

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

3

• Transmitting

4

5

6

7

1• Connect an RF power meter to

[ANT1] connector.

• Apply no audio signal to [MIC]

connector.

• Transmitting

1• Connect an RF power meter to

[ANT1] connector.

• Connect an audio generator to

2

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

3

• Transmitting

4

5

6

Po Min(HF)

Po Tune(HF)

Po 25%(HF)

Po 50%(HF)

Po(HF APC Low Volt)

Po 100%(HF)

Po Max(HF)

APC(HF)

AM POCV Ratio

Po Min(50 M)

Po Tune(50 M)

Po 25%(50 M)

Po 50%(50 M)

Po 100%(50 M)

Po Max(50 M)

Set the output power to 1 W using [DIAL].
Then push [F-4 (SET)] .

Set the output power to 10 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 25 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 75 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 95 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 105 W using
[DIAL]. Then push [F-4 (SET)] key.

Push [F-4 (SET)].

Set the output power to 35 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 1 W using [DIAL].
Then push [F-4 (SET)].

Set the output power to 10 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 25 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 90 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 100 W using
[DIAL]. Then push [F-4 (SET)].

4 - 7

4-4 TRANSMITTER ADJUSTMENT (continue)

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

TX OUTPUT
POWER
(144 MHz)

APC (VHF) 1

TX OUTPUT
POWER
(430 MHz)

1• Connect an RF power to [ANT2]

connector.

• Connect an audio generator to

2

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

3

• Transmitting

4

5

1• Connect an RF power meter to

[ANT2] connector.

• Connect an audio generator to

2

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

3

• Transmitting

4

5

Po Min(144 M)

Po 25%(144 M)

Po 50%(144 M)

Po 100%(144 M)

Po Max(144 M)

APC(VHF)

Po Min(430 M)

Po 25%(430 M)

Po 50%(430 M)

Po 100%(430 M)

Po Max(430 M)

Set the output power to 1 W using [DIAL].
Then push [F-4 (SET)].

Set the output power to 12.5 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 25 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 45 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 50 W using
[DIAL]. Then push [F-4 (SET)].

Push [F-4 (SET)].

Set the output power to 1 W using [DIAL].
Then push [F-4 (SET)].

Set the output power to 8.75 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 17.5 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 31.5 W using
[DIAL]. Then push [F-4 (SET)].

Set the output power to 35 W using
[DIAL]. Then push [F-4 (SET)].

4 - 8

4-4 TRANSMITTER ADJUSTMENT (continue)

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

ALC 1 • Connect an RF power meter to

[ANT1] connector.

• Connect an audio generator to

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

• Transmitting

Drive Min
(HF/50 MHz)

ALC (144 MHz) 1 • Connect an RF power meter to

Drive Min
(144 MHz)

ALC (430 MHz) 1 • Connect an RF power meter to

Drive Min
(430 MHz)

SWR 1 • Connect a 50 Ω dummy load to

1• Set an audio generator as;

Level : 1.5 kHz/20 mV

• Transmitting

[ANT2] connector.

• Connect an audio generator to

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

• Transmitting

1• Set an audio generator as;

Level : 1.5 kHz/20 mV

• Transmitting

[ANT2] connector.

• Connect an audio generator to

[MIC] connector and set as;

Level : 1.5 kHz/30 mV

• Transmitting

1• Set an audio generator as;

Level : 1.5 kHz/20 mV

• Transmitting

[ANT1] connector.

• Transmitting

2• Connect a 100 Ω dummy load to

[ANT1] connector.

• Transmitting

After the adjustment, exit the adjustment mode.

ALC

Drive Min(HF/50 M)

ALC(144 M)

Drive Min(144 M)

ALC(430 M)

Drive Min(430 M)

SWR=1

SWR=2

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

ADJUSTMENT ADJUSTMENT CONDITION

ID APC 1

RESIDUALAM1 • Operating freq. : 10.10000 MHz

• Operating freq. : 18.10000 MHz

• MODE : USB

• Preset R1618 (MAIN
unit) as illustration at
right.

• Connect a wire between CP1601
(MAIN unit) and ground.

• Connect an RF power meter or
dummy load to [ANT1] connec­tor.

• Connect an audio generator to
[MIC ] connector and set as;

Level : 1.5 kHz/30 mV

• Transmitting

After the adjustment, disconnect the wire between CP1601 and ground.

• MODE : FM

• Connect an audio generator to
[MIC] connector and set as;

Level : 1 kHz/30 mV

• Transmitting

MEASUREMENT

UNIT LOCATION UNIT ADJUST

REAR

panel

REAR

panel

Connect a DC ammeter
(30 A type) between the
DC power supply and
transceiver.

Connect an RF power
meter to [ANT1] connec­tor.

4 - 9

VALUE

22 A MAIN R1618

Maximum

output power

ADJUSTMENT

MAIN L701

• MAIN UNIT

CP1601

ID APC preset point

Rear panel view

Ammeter

DC power

supply

ID APC adjustment point

R1618

L701

Residual AM
adjustment point

4 - 10

4-5 RECEIVER ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION

RX PEAK
(HF/50 MHz)

1 • Operating freq : 14.15000 MHz

• MODE : USB

• RIT : OFF

• AGC : FAST

• NB : OFF

• Preamp : ON

• Connect an SSG to [ANT1] con­nector and set as;

Frequency : 14.15150 MHz
Le vel : 500 µV* (–53 dBm)
Modulation : OFF

• Receiving

MEASUREMENT

UNIT LOCATION UNIT ADJUST

REAR

panel

Connect an AC
millivoltmeter to [EXT
SP] jack with an 8 Ω
load.

VALUE

Maximum AF

output level

ADJUSTMENT

MAIN L702,

L703

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY

TOTAL GAIN
(HF/50 MHz)

S-METER
(HF/50 MHz)

RECEIVE
SENSITIVITY
(VHF/UHF)

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

1 • Enter the adjustment mode.

• Push [F-3 (RX)].

2• Connect an SSG to [ANT1] con-

nector and set as;

Level : 500 µV* (–53 dBm)

or OFF

Modulation : OFF

• Connect an AC millivoltmeter to
[EXT SP] jack with an 8 Ω load.

• Receiving

1• Connect an SSG to [ANT1] con-

nector and set as;

Frequency : 14.15150 MHz
Level : OFF

• Receiving

2• Set an SSG as;

Level : 50 µV* (–73 dBm)

• Receiving

3• Set an SSG as;

Level : 32 mV* (–17 dBm)

• Receiving

1• Connect an SSG to [ANT2] con-

nector and set as;

Frequency : 60.2015 MHz
Level : 10 µV* (–87 dBm)
Modulation : OFF

• Receiving

2• Set an SSG as ;

Frequency : 90.8015 MHz

• Receiving

3• Set an SSG as ;

Frequency : 128.8015 MHz

• Receiving

4• Set an SSG as ;

Frequency : 129.2015 MHz

• Receiving

5• Set an SSG as ;

Frequency : 145.3015 MHz

• Receiving

Total Gain(HF/50 M)

S0 Level

S9 Level

S9+60 Level

Tuned BPF(60 M)

Tuned BPF(90 M)

Tuned BPF(128 M)

Tuned BPF(129 M)

Tuned BPF(145 M)

Set 30 dB of AF level difference between
500 µV and no signal input from the SSG
using with [DIAL]. Then push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

OPERATION

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• MAIN UNIT

L703

L702

RX peak
adjustment point

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4-5 RECEIVER ADJUSTMENT (continue)

ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION

RECEIVE
SENSITIVITY
(VHF/UHF)

RX
TOTAL GAIN
(VHF/UHF)

S-METER
(WFM)

ADJUSTMENT ADJUSTMENT CONDITION

WFM
DISTORTION

6• Set an SSG as ;

Frequency : 169.8015 MHz

• Receiving

7• Set an SSG as ;

Frequency : 400.2015 MHz

• Receiving

8• Set an SSG as ;

Frequency : 435.2015 MHz

• Receiving

9• Set an SSG as ;

Frequency : 469.8015 MHz

• Receiving

1• Connect an SSG to [ANT2] con-

nector and set as;

Frequency : 435.2015 MHz
Level : 500 µV* (–53 dBm)

or OFF

Modulation : OFF

• Connect an AC millivolt meter to
[EXT SP] jack with an 8 Ω load.

• Receiving

1• Connect an SSG to the [ANT2]

connector and set as;

Frequency : 90.80 MHz
Leve l : 0.56 µV* (–112 dBm)
Modulation : OFF

• Receiving

2• Set an SSG as;

Level : 3.2 µV* (–97 dBm)

• Receiving

3• Set an SSG as;

Level : 32 µV* (–77 dBm)

• Receiving

After the adjustment, exit the adjustment mode.

1• Operating freq : 90.00000 MHz

MODE : WFM
Preamp : ON

• Connect an SSG to [ANT2] con­nector and set as;

Frequency : 90.0000 MHz
L evel : 3.2 µV* (–97 dBm)
Modulation : 1 kHz
Deviation : 50 kHz

• Receiving

Tuned BPF(170 M)

Tuned BPF(400 M)

Tuned BPF(435 M)

Tuned BPF(470 M)

Total Gain(144M/430M)

S0 Level(WFM)

S9 Level(WFM)

S9+60 Level(WFM)

MEASUREMENT

UNIT LOCATION UNIT ADJUST

REAR

panel

Connect a distortion me­ter to [EXT SP] jack with
an 8 Ω load.

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Set 25 dB of AF level difference between
500 µV and no signal input from the SSG
using with [DIAL]. Then push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

Push [F-4 (SET)].

VALUE

Minimum AF
distortion level

ADJUSTMENT

MAIN C1423

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

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