ICOM 703 REVIEW BY JIM BAUDO, N0UQZ

NEW FOR THE FALL OF 2002

COMMENTS ARE IN RED

160 / 10 ALL MODE QRP RIG
IC-703 is ICOM's product for the QRP enthusiasts. Focusing on QRP performance rather than an all-in-one solution, the IC-703 covers the Amateur Bands 160m to 6m. Depending on the power supply the rig is capable of 5W @ 9.6VDC and 10W @ 13.8VDC, plus it has an internal antenna tuner. ICOM engineers have addressed a lot of the concerns about current consumption and other comments gathered over the past two years regarding QRP performance. While it looks and feels like the IC-706MKIIG, this rig is a QRP version, not a replacement.

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QRP HF TRANSCEIVER

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IC-703       

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IC-756PRO This new model is being designed as a portable HF transceiver that utilizes the design excellence and body of the very successful IC-706 series. It will be similar to an IC-706MKIIG without the VHF and UHF bands, and is a model in a new genre that has an automatic antenna tuner built-in, low consumption circuit design and large external battery for field use as a portable HF QRP unit.

This new model will appeal to HAM user’s who require a convenient portable HF unit, and will be an ideal long distance communications device for sparsely populated territories where set-up of normal communication infrastructure is expensive and impractical.

<Features>

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Relay type antenna tuner unit built-in, 1.9-30MHz coverage
(For 50ohm load antenna. Does not match to a wire antenna

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New low current consumption circuit design to obtain longer battery life

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Large capacity external battery pack and antenna suitable for field operation, will be set as options

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Suitable for not only HAM radio operation, but is an excellent unit for long distance communications in remote mountainous or desert areas where effective communications are not readily available. Also, is perfect as a communications solution for specialized applications.

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Quick power set function to make QRP operation efficient

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 DSP built-in for auto-notch and noise reduction functions
 (DSP functions are equivalent to　UT-106)

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 Max 10W output. Adjustable in 10/5/1/0.5/0.1W steps
(5W when using 9.6V batteries)

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Memory keyer function built-in

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Multi-use versatility for the home or shack, mobile DX’ing in your car and as a field unit in the outdoors

 

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SPECIFICATIONS
 GENERAL
Frequency Range      :DEPENDS ON COUNTRY
Mode    : USB/LSB/CW/RTTY/AM/FM
Temperature range       : -10°C to +60°C; +14°F to +140°F
Antenna Impedance     : 50 ohms(SO-239)
Frequency stability : Less than ±0.5 ppm (0 to 50°C; +32 to +122°F)
No. of Memory Ch. : 105(99 split, 6 scan edges)
Frequency stability : Less than ±0.5 ppm (1 min. after powered ON/0 to 50°C; +32 to +122°F)
Power supply voltage : 9.0 to 15.87 V DC (negative ground)
Current Drain
: Tx

  Rx		   10 W
    5 W
  Standby
  Max. audio		   3.0 A
  2.0 A(9.6V)
  0.25 A (typ.)
  0.45 A (typ.)
Dimensions
 (projections not included)		 : 167(W) × 58(H) × 200(D) mm;
  6 9/16(W) × 2 9/32(H) × 4 7/8(D) in
Weight (approx.) : 2.0 kg; 4 13/32 lb 
 TRANSMITTER
Mode  USB/LSB/CW/RTTY/AM/FM
Modulation system : USB/LSB    Blanced Modulation
  AM      Low Level Modulation
  FM      Variable Reactance Frequency Modulation
Spurious emission : 50 dB (HF bands)  
Carrier suppression : More than 40 dB
Unwanted sideband
suppression		 : More than 50 dB
Spurious Emissions : Below 30 MHz: Less than -50 dB
 Above 50 MHz: Less than -60 dB
Microphone Connector : 8-pin modular jack (600 ohms)
Output Power :USB/LSB/CW/FM/RTTY  0.1 to 10 W (at 13.8V)
   AM                              0.1 to 4 W (at 13.8 V)

 USB/LSB/CW/FM/RTTY   0.1 to 5 W (at 9.6V)
   AM                               0.1 to 2 W (at 9.6 V)
 RECEIVER
Receive system : Double conversion Superheterodyne system
Intermediate frequencies : 1st 64.455 MHz (for all modes)
  2nd 455 kHz (for all modes)
Sensitivity (typical)
: 
Frequency Range
(MHz)		 SSB, CW, RTTY
(at 2.4 kHz BW)		 AM
(at 6 kHz BW)		 FM
(at 15 kHz BW)
0.50 - 1.799 __ 13µV*1 __
1.80 - 29.99 0.16µV *1 2µV *1 __
28.0 - 29.7 0.16µV *1 2µV *1 0.5µV *1
10 dB S/N for SSB, CW, RTTY and AM, 12 dB SINAD for FM
*1 Pre-amp is ON
Squelch sensitivity
 (Pre-amp: ON)
: SSB, CW, RTTY
  FM		   Less than 5.6 µV
  Less than 0.32 µV
Selectivity
 (typical)
: SSB/ CW (BW: 2.4 kHz)
  
  AM /FN-N (BW: 6 kHz)

  FM (BW: 15 kHz)		   More than 2.4 kHz/-6dB
  Less than 4.5 kHz/-60 dB
  More than 8.0 kHz/-6dB
  Less than 30.0 kHz/-60 dB
  More than 12.0 kHz/-6 dB
  Less than 30.0 kHz/-60 dB
Spurious Response : More than 70 dB
AF output power : More than 1.0 W  with an 8 ohms load
RIT variable range : ±9.99 kHz

All stated specifications are subject to change without notice or obligation.


SUPPLIED ACCESSORIES

bulletNot fixed yet

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OPTIONS
bulletAH-2b : Antenna Element
bulletAH-4 : Automatic Antenna Tuner
bulletAT-180 : Automatic Antenna Tuner
bulletCT-17 : CI-V Level Converter
bulletFL-52A : 455kHz CW/RTTY Narrow Filter-500 Hz/-6dB
bulletFL-53A : 455kHz CW Narrow Filter-250 Hz/-6dB
bulletFL-65 : 455kHz SSB Filter-2.4kHz/-6dB
bulletFL-222 : 455kHz SSB Narrow Filter-1.8kHz/-6dB
bulletFL-257 : 455kHz SSB Wide Filter-3.3kHz/-6dB
bulletHM-103 : Hand Microphone
bulletMB-62 : Mobile Mounting Bracket
bulletMB-63 : Mobile Mounting Bracket (For controller head)
bulletMB-65 : Mounting Base
bulletMB-72 : Carry Handle
bulletOPC-581 : 3.5m Separation Cable
bulletOPC-587 : 5m Separation Cable
bulletOPC-589 : Microphone Adaptor Cable (modular to regular 8-pin microphone)
bulletOPC-598 : 7m ACC Cable 
bulletOPC-599 : Adaptor Cable (13pin to 7- and 8-pin ACC sockets)
bulletSM-20 : Stand Microphone
bulletSP-7 : External Speaker
bulletSP-10 : External Speaker
bulletUT-102 : Voice Synthesizer Unit
bulletUT-106 : AF DSP Unit

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