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Last modified 2021-03-29

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Icom IC-721S

A picture of Icom IC-721S

SPECIFICATIONS

GENERAL
Type:Amateur HF transceiver
Frequency range:TX: 10-160 m + WARC (Japan domestic market)
RX: 0.03-33 MHz
Tuning steps:10 / 20 / 50 Hz, 1 KHz, 1 MHz
Frequency stability:Less than 350 Hz @ 0 to 50C (32 to 122F)
Mode:TX: SSB / CW (AM/FM with UI-7 option)
RX: AM / SSB / CW (FM with UI-7 option)
Channels/memory management: 22 regular
2 split
2 scan edge
RAM storage with lithium backup battery
Repeater shift/offset:No dedicated, use VFO A/B split instead
Power supply:13.8 VDC 15%
Current drain/power consumption:RX: 1.2 to 1.5 A
TX: Max 4 A
Antenna impedance/connector:50 ohm / SO-239
Dimensions (W*H*D):241*94*239 mm (9.5*3.7*9.4")
Weight:4.5 Kg (9.92 lb)
Other features:NB. Attenuator.




RECEIVER SECTION
Receiver system: Double conversion superheterodyne (AM/SSB/CW)
1st IF: 70.45 MHz
2nd IF: 9.01 MHz
Triple conversion superheterodyne (FM with UI-7 option)
1st IF: 70.45 MHz
2nd IF: 9.01 MHz
3rd IF: 455 KHz
Sensitivity: AM (10 dB S/N)
0.5-1.8 MHz: 13 uV
1.8-30 MHz: 2 uV
FM (12 dB SINAD), with UI-7 option
28-29.7 MHz: 0.5 uV
SSB/CW (10 dB S/N)
1.8-30 MHz: 0.15 uV
Selectivity: AM: 6 KHz (-6 dB), 20 KHz (-40 dB)
FM: 15 KHz (-6 dB), 30 KHz (-50 dB)
SSB: 2.3 KHz (-6 dB), 4 KHz (-60 dB)
Image rejection:
AF output power/speaker:2.6 W at 10% distortion / 8 ohm
External speaker connector:3.5 mm, 8 ohm




TRANSMITTER SECTION
RF output power: AM: 1-4 W (With UI-7 option)
SSB/CW: 1-10 W
FM: 1-10 W (With UI-7 option)
Modulation system:
FM deviation:5 KHz (With UI-7 option)
Spurious emissions:Less than -50 dB
Microphone impedance/connector:600 ohm / 8-pin (Metal locking ring connector)
Microphone input level:? mV




MISCELLANEOUS
Manufactured:Japan, 198x-199x (Discontinued)
Additional info:
Related documents:
Modifications and fixes:
Reviews:
Options/Accessories:
AH-2b
AH-3
AT-150
CR-64
CT-16
CT-17
EX-627
FL-100
FL-101
HM-12
HM-36
HP-2
IC-4KL
IC-MB5
MB-23
OPC-021A
OPC-118
PS-50
PS-55
SM-8
SP-7
UI-7
UT-30
3.5-30 MHz mobile antenna element
Automatic antenna tuner
Automatic antenna tuner. 10-160 m + WARC.
High stability crystal unit (0.5 ppm)
Satellite interface unit
CI-V level converter
Automatic HF antenna selector
CW narrow filter. 500 Hz (-6 dB)
CW narrow filter. 250 Hz (-6 dB)
Standard hand microphone
Standard hand microphone
Communication headphones
Linear power amplifier. 10-160 m + WARC
Mobile mounting bracket
Carrying handle
DC power cable
Adapter cable. 24-pin to 8-pin
AC power supply. 13.8 VDC, 8 A
AC power supply. 13.8 VDC, 20 A
Desk microphone with dual line output
External speaker
AM TX and FM RX/TX unit
Programmable tone encoder unit (Requires UI-7)
A rear picture of Icom IC-721S