Icom IC-730 Instruction Manual
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Icom IC-730 Instruction Manual

Icom IC-730 Instruction Manual

Hf all bandransceiver
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HF ALL BANDRANSCEIVER
INSTRUCTION MANUAL

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Summary of Contents for Icom IC-730

  • Page 1 HF ALL BANDRANSCEIVER INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    Table of Contents SECTION 1 SPECIFICATIONS ........................1 SECTION 2 FEATURES ..........................2 SECTION 3 INSTALLATION ........................3 SECTION 4 OPERATING CONTROLS ...................... 6 4 – 1 FRONT PANEL ........................6 4 – 2 CONTROLS UNDER ACCESS COVER ................8 4 –...

  • Page 3: Specifications

    SECTION 1 SPECIFICATIONS GENERAL Harmonic Output: More than 50dB below peak power output Number of Semi-Conductors: Spurious Output: Transistors More than 50dB below peak power output Carrier Suppression: IC (Includes CPU) More than 50dB below peak power output Diodes Unwanted Sideband: More than 55dB down at 1000Hz AF input Frequency Coverage: Microphone:...

  • Page 4: Features

    The IC-730 covers all the Amateur r H F frequencies from 3.5M Hz to 29.9999M Hz, including the new three bands of 10MHz, 18MHz and 24MHz. It offers not only SSB, but also AM and CW. All of the circuits in the IC-730, including the driver and final power stages are completely solid state, and provide about 100 watts output.

  • Page 5: Installation

    The connection of the DC power cord supplied with the IC-730 is done in the following way: First make sure that the power switch of the unit is in the OFF position and the T/R switch is in the receive position. Connect the cord to the DC power supply with the RED lead to the positive terminal and the BLACK lead to the negative terminal.
  • Page 6 Key Wiring Diagram on the rear panel. 3 – 7 MICROPHONE The microphone supplied with the IC-730 is the IC-HM7 which contains a preamplifier. The optional electret con- denser type stand microphone IC-SM5 can be used. Their circuit diagrams are shown.
  • Page 7 3 – 10 HEADPHONES power supply make sure that it meets the voltage, current Any good headphone set, including stereo type, that have requirements. Note carefully the overvoltage protection, for 4-16 ohms impedance can be used. With the plug inserted a runaway regulator can destroy the I C-730;...

  • Page 8: Operating Controls

    The POWER SWITCH is a push-lock type switch which ALC zone. In SSB and AM modes, when the speech controls the input DC power to the IC-730. When the processor is in use, the MIC GAIN CONTROL sets the external AC power supply (IC-PS15) is used, the switch also clipping limits, while the RF POWER CONTROL sets the RF acts as the AC power suppl y switch.
  • Page 9 Set the switch to RECEIVE (out) measured by placing the switch located inside the top cover and the IC-730 is in the receive mode. Set the switch to to the SWR position. TRANSMIT (in) and it switches to transmit. When switch- ing with the PTT switch on the microphone or with the ALC;...

  • Page 10: Controls Under Access Cover

    mit frequency. When the RIT is ON, the RIT INDICATOR B. (SPLIT) Selects "B" VFO for receive and "A" VFO is illuminated. Rotating the control to the (+) side raises for transmit. the receive frequency, and rotating to the (-) side lowers the receive frequency.

  • Page 11: Rear Panel Connections

    MEMORY BACKUP (RL) TERMINAL VHF and UHF operation using a suitable transverter with the IC-730 is possible. This terminal is for Transverter For connection of a 9 ~ 12V DC power supply. For mobile connection. The output is a few milliwatts.
  • Page 12 ACC SOCKET CONNECTIONS ACC SOCKET CONNECTIONS PIN No. FUNCTION NC (no connection) 13.8 Volts DC in conjunction with the power switch operation. Connected to Push-to-talk, T/R change-over Outside view switch. When grounded, the set operates in the transmit mode. ANTENNA (ANT) CONNECTOR This is used to connect the antenna to the set.

  • Page 13: Operating Instructions

    SECTION 5 OPERATING INSTRUCTIONS 5 - 1 HOW TO TUNE One complete rotation of the tuning knob results in 1KHz The following instructions are for tuning in any mode. with 10Hz steps, 10KHz with 100Hz steps, or 100KHz with Please read carefully and understand fully before turning 1KHz steps, frequency increase or decrease.
  • Page 14 DIAL LOCK BUTTON 5 - 1 - 6 NORMAL/SPLIT SWITCH After the IC-730 is set at a certain frequency for rag chew- Pushing the NO R MA L/SPLIT switch will change the rela- ing, mobile operation, etc., pushing the Dial Lock switch the tionshi p of the two VFO's.

  • Page 15: Ssb Operation

    pushing the RIT switch once the RIT circuit is turned ON them. However, the memory can be used for all seg- and the RIT Indicator is lit. ments. For example, when 28.055.0 is written in the The receive frequency is shifted with the RIT Control knob. memory, it can be used for 28.555.0, 29.055.0 and 29.555.0MHz also.
  • Page 16 NB switch OFF. 5 - 2 - 3 AGC (AUTOMATIC GAIN CONTROL) The IC-730 has a fast attack/slow release AGC system which holds the peak voltage of rectified IF signals from the IF amp circuit for a certain period. Therefore, during the pauses in normal speech of the received signal, uncomforta- ble noise will not be heard.

  • Page 17: Cw Operation

    HOW TO USE THE VOX CIRCUIT 5 - 3 - 2 TRANSMITTING The IC-730 has a built-in VOX (voice operated relay) which Insert the keyer plug into the KEY Jack on the rear panel of the unit, and set knobs and switches as follows: allows automatic T/R switching by voice signals into the microphone.

  • Page 18: Am Operation

    Transmitting AM signals is essentially the same as SSB transmission. The final transistors used in the IC-730 are of good design and are protected to a reasonable extent by circuits Set knobs and switches the same as for SSB operation. The RF output power can be adjustable between 10 Watts and incorporated in the set.
  • Page 19 A very accurate frequency counter is necessary to align the 5 - 5 - 5 SATELLITE COMMUNICATION frequency of the IC-730. However, the frequency can be aligned simply by receiving the WWV signal. At present there are two active satellites for amateur radio use, though more are being planned.
  • Page 20 Cable connections with a linear amplifier NOTE: Internal connection of the IC-730 should be changed. (Refer to page 10.) Cable connections with a linear amplifier NOTE: Linear amplifier should have a T/R control circuit which is actuated by +8V (max 5mA).

  • Page 21: Circuit Description

    SECTION 6 CIRCUIT DESCRIPTION PREAMP switch is in OFF position, the signal is directly fed The IC-730 employs a pre-mixed local oscillator for both to the band-pass filter. The band-pass filter is selected its transmit and receive. The local oscillator consists of a digital respective filter depending on the band selected.
  • Page 22 MHz local oscillator signal to convert the 9.0115MHz signal The 2 local oscillator is a VXO (Variable Crystal Oscillator), and its frequency is varied 30.71901MHz ~ 30.72000 MHz into a 455K Hz signal. in 10Hz steps, and 30.7191MHz ~ 30.7200MHz in 100Hz steps by the output signals of the CPU through the D/A This 455KHz signal is fed to a 455KHz ceramic filter in AM mode, or to a mechanical filter in SSB and CW mode, then...
  • Page 23 The IC-730 has a PA protection circuit which detects 6 - 7 LOGIC UNIT reflected power, and ALC condition. This unit is composed of an incorporated CPU for treating data such as up/down signal detection control, the dial lock If some problem occurs, such as mismatching of the...
  • Page 24 This unit has a diode matrix circuit which convert the band 13.2MHz ~ 13.9MHz signal with 1KHz steps, and sent to the PREMIX unit. signal into the control signals for the CPU. The local oscillator is a VXO, and its frequency is varied few 6 - 11 BPF UNIT KHz by the RIT control and the FREQUENCY SET control...

  • Page 25: Inside Views

    SECTION 7 INSIDE VIEWS 7 - 1 TOP VIEW 7 - 2 RF UNIT -- 23 --...
  • Page 26 7 - 3 BOTTOM VIEW 7 - 4 LPF UNIT and ACC BOARD 7 - 5 PA UNIT -- 24 --...
  • Page 27 7 - 6 IF UNIT 7 - 7 LOGIC UNIT 7 - 8 DISPLAY UNIT -- 25 --...

  • Page 28: Trouble Shooting

    SECTION 8 TROUBLE SHOOTING Your IC-730 has been carefully adjusted at the factory prior to shipping. The chart below has been provided to help you correct problems which are not equipment malfunctions. If you are unable to locate the trouble, or correct the fault, please contact your dealer or the nearest ICOM Service Center.
  • Page 29 Problem Possible Cause Solution 10. The frequency does not change by DIAL LOCK is engaged. Disengage the DIAL LOCK by pressing rotating the Tuning knob. and releasing the DIAL LOCK switch. 11. An abnormal figure is displayed The Power switch was turned OFF and Turn the Power switch OFF, wait 30 on the frequency display or fails to ON too quickly.

  • Page 30: Block Diagram

    SECTION 9 BLOCK DIAGRAM -- 28 --...

  • Page 31: Options

    SECTION 10 OPTIONS -- 29 --...
  • Page 32 ICOM INCORPORATED 1-6-19, KAMIKURATSUKURI HIRANO-KU, OSAKA JAPAN A-0325 Printed in Japan...

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