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IC-728 - HF Base Transceiver | Radioaficion Ham Radio

IC-728 - HF Base Transceiver

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ICOM IC-728 - HF Base Transceiver

Manufactured: Japan, 1992-199x (Discontinued)

ICOM IC-728 - HF Base Transceiver

Quick Specs:
HF transceiver
RX: 30 kHz-30 MHz
TX: all amateur HF bands
Output power: 100 W (40 W AM)
Modes: SSB, CW standard; AM optional, FM optional
Receiver sensitivity (preamp ON): 
less than 0.16 µV (SSB, CW for 10 dB S/N), less than 2.0 µV (AM for 10 dB S/N)
less than 0.5 µV (FM for 12 dB SINAD)

Detailed Specifications

GENERAL

  • Frequency Coverage:
    Receive: 30 kHz ~ 30 MHz
    guaranteed range 500 kHz ~ 30 MHz
    Transmit:
    1.800 ~ 1.99999 MHz
    3.500 ~ 4.000 MHz
    7.000 ~ 7.300 MHz
    10.100 ~ 10.150 MHz
    14.000 ~ 14.350 MHz
    18.068 ~ 18.168 MHz
    21.000 ~ 21.450 MHz
    24.890 ~ 24.990 MHz
    28.000 ~ 29.700 MHz
  • Mode: SSB, CW, AM*, FM* (An optional U1-7 AM/FM UNIT is required for AM transmission and FM transmission/reception.)
  • Number of memory channels: 26
  • Antenna impedance: 50 ohms nominal
  • Usable Temperature Range: -10°C to +60°C; +14°F to +140°F
  • Frequency stability: Less than ±200 Hz from 1 min. to 60 min. after power ON. After that, the rate of stability change is less than ±30 Hz/hr at +25°C; +77°F. Temperature fluctuations (0°C to +50°C; +32°F to +122°F) less than ±350 Hz.
  • Power Supply Requirement: 13.8 V DC ±15%
  • Current Drain (at 13.8 V DC):
    Transmit: 20 A
    Receive: squelched =1.3 A; max. audio output =1.6 A
  • Dimensions: 241(W) x 94(H) x 239(D) mm, 9.5(W) x 3.7(H) x 9.4(D) in (projections not included)
  • Weight: 4.6 kg; 10.1 lb.

Transmitter

  • Output power:
    SSB, CW, FM: 10 to 100 W continuously adjustable
    AM: 10 to 40 W continuously adjustable
  • Spurious emissions: Less than -50 dB
  • Carrier suppression: More than 40 dB
  • Unwanted sideband: More than 50 dB
  • Microphone impedance: 600 ohms

Receiver

  • Receive system: Triple-conversion superheterodyne
  • Sensitivity (preamp ON) (1.8 to 30 MHz):
    SSB, CW - Less than 0.16 µV for 10 dB A/N
    AM - Less than 2.0 µV for 10 dB S/N
    FM - Less than 0.5 µV for 12 dB SINAD
  • Intermediate frequencies:
    Mode 1st 2nd 3rd
    SSB 70.4515 MHz 9.0115 MHz 455 kHz
    CW 70.4506 MHz 9.0106 MHz 455 kHz
    AM, FM 70.4500 MHz 9.0100 MHz 455 kHz
  • Selectivity:
    SSB, CW - More than 2.1 kHz/-6 dB ; Less than 4.0 kHz/-60 dB
    AM - More than 6.0 kHz/-6 dB ; Less than 20.0 kHz/-40 dB
    FM - More than 12 kHz/-6 dB ; Less than 30 kHz/-50 dB
  • Spurious and image rejection ratio: More than 70 dB
  • Audio output power: More than 2.6 W with an 8 ohm load
  • RIT variable range: ±1.2 kHz

IC-728 Options

Linear Amplifiers

  • IC-4KL 1 kW LINEAR AMPLIFIER: All solid state linear amplifier. The amplifier/power supply unit and remote control unit are separated.
  • IC-2KL 500 W LINEAR AMPLIFIER: All solid state linear amplifier. The power amplifier unit can be separately set up from the power supply unit.

Automatic Antenna Tuners, Antenna Element and Antenna Selector

  • IC-AT500 500 W AUTOMATIC ANTENNA TUNER: Best match for the IC-728 with the IC-2KL. Includes an automatic antenna selector for 4 separate antennas.
  • AT-160 100 W AUTOMATIC ANTENNA TUNER: Can be attached to the IC-728 side panel. Power and tuning are controlled through the IC-728.
  • AT-150 100 W AUTOMATIC ANTENNA TUNER: Style and size are matched with the IC-728. Includes an automatic antenna selector for 3 separate antennas. Moreover, a long wire antenna can be tuned.
  • AH-3 100 W AUTOMATIC ANTENNA TUNER: Matches the IC-728 to a long wire antenna for portable or mobile operation. Matches a more than 12 m long wire to all bands between 1.8 to 30 MHz.
  • AH-2b ANTENNA ELEMENT: A 2.5 m long antenna for mobile operation with the AH-3. All bands between 1.8 to 30 MHz can be matched.
  • EX-627 AUTOMATIC ANTENNA SELECTOR: Automatically selects the antenna. 9 separate antennas can be connected. Manual selection is also possible. Max input power: 1000 W PEP

DC Power Supplies

  • IC-PS15 DC POWER SUPPLY: A power transformer power supply. (13.8 V DC/20 A)
  • IC-PS30 DC POWER SUPPLY: A system power supply for the IC-728. 3 extra output connectors are included. (13.8 V DC/25 A)
  • PS-55 DC POWER SUPPLY: A power transformer power supply. (13.8 V DC/20 A)

External Speakers

  • IC-SP3 EXTERNAL SPEAKER (8 ohms/4 W)
  • SP-7 EXTERNAL SPEAKER (8 ohms/5 W)
  • SP-20 EXTERNAL SPEAKER: High performance speaker including 4 audio filters and a headphone jack. Can be connected to 2 transceivers.(8 ohms/5 W)

Microphones

  • SM-6 DESKTOP MICROPHONE
  • SM-8 DESKTOP MICROPHONE
  • SM-20 DESKTOP MICROPHONE

Internal Units and Filters

  • UI-7 AM/FM UNIT: Provides AM transmission FM transmission/reception.
  • UT-30 PROGRAMMABLE TONE ENCODER UNIT: Provides 38 programmable subaudible tones.
  • CR-64 HIGH-STABILITY CRYSTAL UNIT: For improved frequency stability: 0.5 ppm (-30°C to +60°C)
  • FL-100/FL-101 CW NARROW FILTERS: Passband width: FL-100 (500 Hz/-6 dB); FL-101 (250 Hz/-6 dB)

Others

  • CT-16 SATELLITE INTERFACE UNIT: Easy tuning for instant satellite communications.
  • CT-17 CI-V LEVEL CONVERTER: For remote transceiver control using a personal computer. Equipped with an RS-232C output port.
  • IC-MB5 MOBILE MOUNTING BRACKET
  • MB-23 CARRYING HANDLE

Related documents:

User manual (5.9 MB)

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