IC756PRO manual.pdf
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INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756PRO
IMPORTANT
EXPLICIT DEFINITIONS
READ THIS INSTRUCTION MANUAL
CAREFULLY
before attempting to operate the
transceiver.
WORD
DEFINITION
Personal injury, fire hazard or electric
shock may occur.
R
WARNING
SAVE THIS INSTRUCTION MANUAL.
This
manual contains important safety and operating in-
structions for the IC-756PRO.
CAUTION
Equipment damage may occur.
If disregarded, inconvenience only.
No risk of personal injury, fire or
electric shock.
NOTE
PRECAUTIONS
Place unit in a secure place to avoid inadvertent use by chil-
dren.
R
WARNING HIGH VOLTAGE! NEVER
attach
an antenna or internal antenna connector during trans-
mission. This may result in an electrical shock or burn.
During mobile operation,
DO NOT
operate the trans-
ceiver without running the vehicle’s engine. When
transceiver power is ON and your vehicle’s engine is
OFF, the vehicle’s battery will soon become exhausted.
R
NEVER
apply AC to the [DC13.8V] jack on the
transceiver rear panel. This could cause a fire or ruin
the transceiver.
Make sure the transceiver power is OFF before start-
ing the vehicle. This will avoid possible damage to the
transceiver by ignition voltage spikes.
R
NEVER
apply more than 16 V DC, such as a 24 V
battery, to the [DC13.8V] jack on the transceiver rear
panel. This could cause a fire or ruin the transceiver.
During maritime mobile operation, keep the transceiver
and microphone as far away as possible from the mag-
netic navigation compass to prevent erroneous indica-
tions.
R
NEVER
let metal, wire or other objects touch any
internal part or connectors on the rear panel of the
transceiver. This may result in an electric shock.
NEVER
expose the transceiver to rain, snow or any
liquids.
BE CAREFUL!
The heatsink will become hot when
operating the transceiver continuously for long periods.
AVOID
using or placing the transceiver in areas with
temperatures below –10°C (+14°F) or above +60°C
(+140°F). Be aware that temperatures on a vehicle’s
dashboard can exceed 80°C (+176°F), resulting in per-
manent damage to the transceiver if left there for ex-
tended periods.
BE CAREFUL!
If a linear amplifier is connected, set
the transceiver’s RF output power to less than the lin-
ear amplifier’s maximum input level, otherwise, the lin-
ear amplifier will be damaged.
Use Icom microphones only (supplied or optional).
Other manufacturer’s microphones have different pin
assignments, and connection to the IC-756PRO may
damage the transceiver.
AVOID
placing the transceiver in excessively dusty en-
vironments or in direct sunlight.
AVOID
placing the transceiver against walls or putting
anything on top of the transceiver. This will obstruct
heat dissipation.
Spurious may be received near the following frequencies.
These are made in the internal circuit and does not indicate a
transceiver malfunction:
6.144 MHz, 8.000 MHz,
12.288 MHz, 12.890 MHz (when spectrum scope is ON),
18.433 MHz, 24.573 MHz
Versions of the IC-756PRO which display the “CE”
symbol on the serial number seal, comply with the
European harmonised standard ETS300 684
(EMC product standard for Commercially Available
Amateur Radio Equipment).
i
1
TABLE OF CONTENTS
IMPORTANT ........................................ i
EXPLICIT DEFINITIONS ..................... i
PRECAUTIONS ................................... i
5
RECEIVE AND TRANSMIT .. 26 – 49
∂F scan operation ........................ 57
Fine programmed scan/
fine ∂F scan ................................. 58
Mode selection ............................. 26
Twin PBT operation ...................... 26
Memory scan operation ................ 58
Notch function .............................. 27
Select memory scan operation ..... 59
Noise reduction ............................ 27
1
TABLE OF CONTENTS ................ 1
Setting select memory channels .. 59
Noise blanker ............................... 27
Scan set mode ............................. 60
RTTY filter/Twin peak filter ........... 28
2
PANEL DESCRIPTION ........... 2 – 13
Tone scan ..................................... 61
CW reverse mode ......................... 28
Front panel ..................................... 2
RTTY reverse mode ..................... 28
Microphone (HM-36) ...................... 9
CW pitch control ........................... 29
8
CLOCK AND TIMERS .......... 62 – 63
LCD display .................................. 10
IF filter selection ........................... 29
Setting the current time ................ 62
Screen menu arrangement ........... 11
AGC function ................................ 30
Setting power-on time .................. 62
Rear panel .................................... 12
Dualwatch operation ..................... 31
Setting power-off period ............... 63
Split frequency operation .............. 32
Timer operation ............................ 63
3
INSTALLATION AND
CONNECTIONS ................... 14 – 21
Quick split function ....................... 33
RIT and ∂TX ................................ 34
9
SET MODE ........................... 64 – 72
Monitor function ............................ 35
Unpacking .................................... 14
Set mode description ................... 64
VOX function ................................. 35
Selecting a location ...................... 14
Level set mode ............................. 65
Meter function ............................... 36
Grounding ..................................... 14
Display set mode .......................... 66
SWR reading ................................ 36
Antenna connection ..................... 14
Timer set mode ............................ 67
Speech compressor ..................... 37
Required connections ................... 15
Miscellaneous (others) set mode .. 68
Digital voice recorder .................... 38
Advanced connections ................. 16
RTTY decoder .............................. 41
Power supply connections ............ 17
10 OPTION INSTALLATION ............ 73
RTTY tuning meter ....................... 41
Linear amplifier connections ......... 18
Opening the transceiver’s case .... 73
Electronic CW keyer ..................... 42
Transverter jack information ......... 19
UT-102
VOICE SYNTHESIZER
UNIT
.............................................. 73
Memory keyer ............................... 43
External antenna selector or
antenna tuner connections ........... 20
Spectrum scope screen ............... 44
Automatic antenna selection ........ 45
FSK and AFSK (SSTV)
connections .................................. 21
11 MAINTENANCE ................... 74 – 76
Dial lock function .......................... 45
Troubleshooting ............................ 74
Repeater operation ....................... 46
Fuse replacement ......................... 75
Tone squelch operation ................ 47
4
FREQUENCY SETTING ....... 22 – 25
Clock backup battery
replacement .................................. 75
Antenna tuner operation ............... 48
When first applying power
(CPU resetting) ............................. 22
Optional external tuner
operation ...................................... 49
Tuning dial brake adjustment ........ 76
Initial settings ................................ 22
Frequency calibration
(approximate) ................................ 76
VFO description ............................ 23
6
MEMORY OPERATION ........ 50 – 55
Memory channels ......................... 50
Memory channel selection ........... 50
Memory channel screen ............... 51
Memory channel programming ..... 52
Frequency transferring ................. 53
Memory names ............................ 54
Memory clearing ........................... 54
Memo pads ................................... 55
Frequency setting with the
tuning dial ..................................... 24
12 INTERNAL VIEWS ...................... 77
Direct frequency entry with
the keypad .................................... 24
13 CONTROL COMMAND ........ 78 – 79
Advanced tuning functions ........... 25
Remote jack (CI-V) information .... 78
14 SPECIFICATIONS ....................... 80
15 OPTIONS ..................................... 81
7
SCANS ................................. 56 – 61
Scan types .................................... 56
Preparation ................................... 56
Programmed scan operation ........ 57
SUPPLIED ACCESSORIES
The transceiver comes with the following accessories.
Qty.
q
DC power cable (OPC-025D) ............................ 1
w
Hand microphone (HM-36) ................................ 1
e
Spare fuses (FGB 30 A) .................................... 2
r
Spare fuse (FGB 5 A) ........................................ 1
t
CW keyer plug (AP-330) .................................... 1
q
w
e
r
t
1
2
PANEL DESCRIPTION
Front panel
!6
!5
!4
!3
!2
TIMER
HF/50MHz TRANSCEIVER
q
POWER
TRANSMIT
w
i756PRO
PHONES
TUNER MONITOR
NB
NR
e
AF
RF/SQL
BAL
NR
ELEC-KEY
r
MIC
t
F-1
F-2
F-3
F-4
F-5
SSB
CW/RTTY
AM/FM
FILTER
EXIT
MIC GAIN
RF POWER
COMP
KEY SPEED BK-IN DELAY
yi
u
o !0
!1
q
POWER SWITCH [POWER/TIMER]
(dot)
(com)
(dash)
Push momentarily to turn power ON.
• Turn the optional DC power supply ON in advance.
• A/D convertor calibration of the DSP unit starts and it
takes 10 sec.
Push momentarily to toggle the timer function ON
and OFF. (p. 63)
• The power switch lights while the timer function is ON.
t
MICROPHONE CONNECTOR [MIC]
Accepts the supplied or optional microphone.
• See p. 81 for appropriate microphones.
• See p. 9 for microphone connector information.
Push for 2 sec. to turn power OFF.
w
TRANSMIT SWITCH [TRANSMIT]
Selects transmitting or receiving.
• The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
y
AF CONTROL [AF]
(inner control)
Varies the audio output level from the speaker.
AF
RF/SQL
Decreases
Increases
e
HEADPHONE JACK [PHONES]
Accepts headphones.
• Output power: 5 mW with an 8
No audio output
Max. audio output
load.
• When headphones are connected, the internal speaker
or connected external speaker does not function.
u
MIC GAIN CONTROL [MIC GAIN]
Adjusts microphone input gain.
• The transmit audio tone in SSB mode can be adjusted
in set mode. (p. 65)
r
ELECTRONIC KEYER JACK [ELEC-KEY]
(p. 42)
Accepts a paddle to activate the internal electronic
keyer for CW operation.
• Selection between the internal electronic keyer, bug-key
and straight key operation can be made in keyer set
mode. (p. 42)
• A straight key jack is separately available on the rear
panel. See [KEY] on p. 12.
• Keyer polarity (dot and dash) can be reversed in keyer
set mode. (p. 42)
• 4-channel memory keyer is available for your conve-
nience. (p. 43)
✔
How to set the microphone gain.
Set the [MIC] control so that the ALC meter sometimes
swings during normal voice transmission in SSB mode.
Recommended level for
an Icom microphone
Decreases
Increases
MIC GAIN
2
2
PANEL DESCRIPTION
i
RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL]
(outer control)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
• The squelch is particularly effective for FM. It is also
available for other modes.
• 12 to 1 o’clock position is recommended for any setting
of the [RF/SQL] control.
• The control can be set as ‘Auto’ (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM) or
squelch control (RF gain is fixed at maximum) in set
mode as follows. (p. 68)
o
RF POWER CONTROL [RF POWER]
Continuously varies the RF output power from min-
imum (5 W*) to maximum (100 W*).
* AM mode: 5 W to 40 W
Decreases
Increases
RF POWER
!0
BALANCE CONTROL [BAL]
(inner control; p. 31)
Adjusts the audio output balance between main and
sub readout frequencies while in dualwatch.
BAL
NR
Increases main
readout gain
Increases sub
readout gain
SET MODE SETTING
MODE
AUTO
SQL
RF GAIN + SQL
SSB, CW
RTTY
AM, FM
RF GAIN
SQL
SQL
SQL
RF GAIN + SQL
RF GAIN + SQL
!1
NOISE REDUCTION LEVEL CONTROL [NR]
(outer control; p. 27)
Adjusts the noise reduction level when the noise re-
duction is in use. Set for maximum readability.
• When setting as RF gain/squelch control
Noise squelch (FM mode)
BAL
NR
Decreases
Increases
Recommended level
Squelch is
open.
Maximum
RF gain
OFF
!2
NOISE REDUCTION SWITCH [NR]
(p. 27)
Toggles the noise reduction ON and OFF.
RF gain
adjustable
range
S-meter
squelch
NR
NR
Noise reduction OFF
Noise reduction ON
• When functioning as RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
!3
NOISE BLANKER SWITCH [NB]
(p. 27)
Toggles the noise blanker ON and OFF. The noise
blanker reduces pulse-type noise such as that gen-
erated by automobile ignition systems. This function
cannot be used for FM, or non-pulse-type noise.
Maximum
RF gain
Adjustable
range
NB
NB
Noise blanker OFF
Noise blanker ON
Minimum RF gain
!4
S/RF METER
(p. 36)
Shows the signal strength while receiving. Shows
the relative output power, SWR, ALC or compres-
sion levels while transmitting.
• When functioning as squelch control
(RF gain is fixed at maximum.)
Noise squelch (FM mode)
Noise squelch
threshold
(FM mode)
!5
MONITOR SWITCH [MONITOR]
(p. 35)
Monitors your transmitted IF signal.
• The CW sidetone functions when [MONITOR] is OFF in
CW mode.
S-meter squelch
threshold
S-meter
squelch
Squelch is
open.
!6
ANTENNA TUNER SWITCH [TUNER]
(p. 48)
Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
Shallow
Deep
Starts to tune the antenna manually when
pushed for 2 sec.
• When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
3
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