Icom IC-756PROII RECEIVE AND TRANSMIT

5

25

RECEIVE AND TRANSMIT

■Mode selection

■Twin PBT operation

General PBT(Passband Tuning) function electronically

narrows the IF passband width by shifting the IF fre-

quency to slightly outside of the IF ﬁlter passband to

reject interference. This transceiver uses the DSP cir-

cuit for the PBT function. Moving both [TWIN PBT]

controls to the same position shifts the IF.

➥The LCD shows the passband width and shift fre-

quency graphically.

➥Push [FILTER] for 1 sec. to enter the ﬁlter set mode.

Current passband width and shift frequency is dis-

played in the ﬁlter set mode screen.

➥To set the [TWIN PBT] controls to the center posi-

tions, push [PBT CLR] for 1 sec.

The variable range depends on the passband width

and mode. The edge of the variable range is half of the

passband width, and PBT is adjustable in 25 or 50 Hz

steps. These controls function as an IF shift control

while in AM mode and when the RTTYﬁlter is turned

ON. Only the inner control may function in this case.

IF shift is adjustable in 20/40 Hz steps in RTTY(RTTY

ﬁlter is turned ON) or 150/300/500 Hz steps in AM.

•[TWIN PBT] should normally be set to the center posi-

tions (PBT setting is cleared) when there is no interfer-

ence.

•When PBTis used, the audio tone may be changed.

•Not available for FM mode.

•While rotating [TWIN PBT], noise may occur. This comes

from the DSP unit and does not indicate an equipment

malfunction.

The following modes are available in the IC-

756PROII:

SSB (LSB/USB), CW, CW-R (CW reverse), RTTY,

RTTY-R (RTTYreverse), AM and FM. Data modes of

SSB, AM and FM are also available.

Microphone signals are muted when data mode is

selected.

To select a mode of operation, push the desired mode

switch momentarily. Push the switch again to toggle

between USB and LSB, CW/CW-R and RTTY/RTTY-

R, AM and FM, if necessary. Push the switch for

1 sec. to toggle between CW and CW-R, RTTY and

RTTY-R, or to select data mode, if necessary.

See the diagram below for the order of selection.

PBT OPERATION EXAMPLE

SSB

CW/RTTY

AM/FM

USB-D USB

CW-R CW

AM-D AM

Push mode switch

for 1 sec. Push mode switch

momentarily.

LSB LSB-D

RTTY RTTY-R

FM FM-D

TWIN PBT TWIN PBT

TWIN PBT

IF center frequency Interference Desired signal

Passband

Both controls at

center position Cutting a lower

passband Cutting both higher and

lower passbands

Interference Interference

Desired signal

Passband

Contents

Main IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY SAVE THIS INSTRUCTION MANUAL. EXPLICIT DEFINITIONS RWARNING HIGH VOLTAGE! NEVERat- TABLE OF CONTENTS r t 3 INSTALLATION AND CONNECTIONS ................... 1420 4 FREQUENCYSETTING ....... 21 24 PANEL DESCRIPTION Page Page Page Page Page Page MICROPHONE CONNECTOR HM-36 SCHEMATIC DIAGRAM CAUTION: Microphone (HM-36) LCD display qr.qqy.pp 11 PANELDESCRIPTION F-2 F-3 F-4 F-5 Screen menu arrangement Pushing [EXIT/SET] several times returns to the start up screen. See p. 64 for set mode arrangement. Rear panel DACC SOCKETS INSTALLA TION AND CONNECTIONS Unpacking Selecting a location Grounding R WARNING: NEVER Required connections Front panel Rear panel Advanced connections Front panel Rear panel Power supply connections CAUTION: NEVER connect Linear amplier connections amplier. CONNECTING THE IC-PW1 Turn OFF the transceivers antenna tuner while tuning the IC-PW1s tuner. IC-PW1 CONNECTING ANON-ICOM LINEAR AMPLIFIER External antenna tuner connection Transverter jack information FSK and AFSK (SSTV) connections FREQUENCY SETTING Initial settings When rst applying power (CPU resetting) 22 4 VFO description MEMO PAD 21.076.5021.076.50 1CWCW USBUSB 4 Direct frequency entry with the keypad Frequency setting with the tuning dial 21.295.00 21.090.00 4 Advanced tuning functions RECEIVE AND TRANSMIT Mode selection Twin PBT operation Notch function Noise reduction Noise blanker DSP lter shape RTTY lter selection RTTY reverse mode RTTY lter/Twin peak lter CW reverse mode CW pitch control IF lter selection IF lter selection Filter passband width setting AGC function AGC time constant selection Selectable AGC time constant (unit: sec.) Setting the AGC time constant Dualwatch operation Scanning during dualwatch Split frequency operation Quick split function 34 RIT and TX Push and hold p.wt q.wt Low shift High shift Monitor function VOX function Using the VOX function Adjusting the VOX function Meter function Analog transmit meter Multi-function digital meter SWR reading Speech compressor Speech compressor Compression level setting Preamp Digital voice recorder Recording a received audio Playing the recorded audio One-touch voice recording One-touch playback Recording a message for transmit Conrming a message for transmit Programming a memory name for transmit Sending a message for transmit Transmit monitor function Transmit level setting RTTY decoder Setting the decoder threshold level RTTY tuning meter 43 Electronic CW keyer [KEYER] switch[CW/RTTY] switch SENDSEND EDITEDIT 001001 CW KEYCW KEY MEMORY KEYERMEMORY KEYER VFOVFO CWCW Memory keyer Programming the memory keyer Transmitting memory keyer contents Setting the contact (serial) number Spectrum scope screen Spectrum scope during transmitting Maximum level hold function Automatic antenna selection Antenna switch selection example Dial lock function Repeater operation Setting the repeater tone Tone squelch operation tWhen the received signal includes a matching tone, squelch opens and the signal can be heard. Setting the tone squelch tone tPush [EXIT/SET] to exit tone set mode. Available tone squelch tones (Unit: Hz) Store tone squelch frequencies and ON/OFF settings in memory channels for easy recall. Antenna tuner operation CAUTION: NOTES: Optional external tuner operation AH-4/AH-3 HF AUTOMATIC ANTENNA TUNER RWARNING: HIGH VOLTAGE! NEVER AH-4/AH-3 operation MEMORY OPERATION then F-INPENT Memory channels eTo return to VFO mode, push [VFO/MEMO] again. Memory channel screen Selecting a memory channel using the memory channel screen Conrming programmed memory channels Setting a memory channel as a select memory 6 53 MEMORYOPERATION SSB MW Frequency transferring Transferring in VFO mode Transferring in memory mode 6 55 MEMORYOPERATION M-CL eSelect the desired memory channel. Memo pads Writing frequencies and operating modes into memo pads TEMPORARY PAD MEMO PADS Calling up a frequency from a memo pad SCANS Scan types Squelch condition Preparation Channels 7 Programmed scan operation wSelect VFO mode. eSelect the desired operating mode. uSet center frequency of the F span. The operating mode can also be changed while scan- ning. rPush [(F-5)SCAN] to select the scan screen. 7 59 Fine programmed scan/ne F scan tPush [(F-3)FINE] to start a ne scan. FINE PROGRAM SCAN or FINE F SCAN ap- pears. 7 Select memory scan operation 12 12 1212 12 12 1212 7 Scan set mode Scan speed Scan resume condition Tone scan CLOCK AND TIMERS Setting the current time rSet the current time using the tuning dial. TIMEset Push [SET] blinks. tPush [(F-4)SET] to enter the set time. 8 Setting power-off period Timer operation Setting power-on time 64 SET MODE F5 F-1 EXIT/SET OTHERS OTHERS Level set mode SSSSBB TTxx TToonnee ((BBaassss)) SSSSBB TTxx TToonnee ((TTrreebbllee)) MMoonniittoorr LLeevveell SSiiddee TToonnee LLeevveell Display set mode CCoonnttrraasstt ((LLCCDD)) BBaacckklliigghhtt ((LLCCDD)) HHoorriizzoonn BBaacckklliigghhtt((SSwwiittcchheess)) Display set mode (continued) DSP lter set mode Timer set mode TTiimmee ((NNooww)) TTiimmeerr FFuunnccttiioonn PPoowweerr--OOFFFF ppeerriioodd PPoowweerr--OONN TTiimmeerr sseett QQuuiicckk DDuuaallwwaattcchh QQuuiicckk SSPPLLIITT RRFF//SSQQLL CCoonnttrrooll FFMM SSPPLLIITTOOffffsseett((HHFF)) FFMM SSPPLLIITTOOffffsseett((5500MM)) TTuunneerr ((AAuuttoo SSttaarrtt)) TTuunneerr ((PPTTTT SSttaarrtt)) RRTTTTYY MMaarrkk FFrreeqquueennccyy RRTTTTYY SShhiifftt WWiiddtthh RRTTTTYY KKeeyyiinngg PPoollaarriittyy RRTTTTYY DDeeccooddee UUSSOOSS RRTTTTYY DDeeccooddee NNeeww LLiinnee CCooddee SSPPEEEECCHH LLaanngguuaaggee SSPPEEEECCHH SSppeeeedd SSPPEEEECCHH SS--LLeevveell MMAAIINN DDIIAALL AAuuttoo TTSS SSSSBB//CCWW SSyynncchhrroonnoouuss TTuunniinngg CCWW NNoorrmmaall SSiiddee MMIICC UUpp//DDoowwnn SSppeeeedd QQuuiicckk RRIITT//TTXX CClleeaarr EExxtteerrnnaall KKeeyyppaadd CCII--VV BBaauudd RRaattee CCII--VV AAddddrreessss CCII--VV TTrraannsscceeiivvee CCII--VV wwiitthh IICC--773311 OPTION INSTALLATION CAUTION: VOICE SYNTHESIZER UNIT Opening the transceivers case UT-102 MAINTENANCE TRANSMIT SCAN Troubleshooting solve it through the use of this chart, contact your near- est Icom Dealer or Service Center. 11 Fuse replacement CAUTION: Clock backup battery replacement 11 Tuning dial brake adjustment Frequency calibration (approximate) CAUTION: INTERNAL VIEWS Top view Bottom view 79 CONTROL COMMAND mini-plug cable FE FE E0 64 FA FD CI-V connection example Data format 13 Command table (continued) To send/read memory contents Band stacking register Channel code for memory keyer Characters code for my call FM split frequency (HF/50 MHz) setting SPECIFICATIONS General Transmitter Receiver Antenna tuner OPTIONS