Icom IC-720A Instruction Manual page 5

SECTION 2 FEATURES
REAL ALL BAND, ALL MODE, ALL SOLID STATE
The ІС-720А covers all the Amateur HF frequencies from 1.8MHz to 29.999.9MHz, including the new three bands. It offers
not only SSB, but also AM, CW and RTTY. АП of the circuits іп the ІС-720А, including the driver and final power stages аге
completely solid state, and provide about 100 Watts output.
GENERAL COVERAGE RECEIVER CAPABILITY.
The 1С-720А has capabilities for an all amateur band transceiver as well as a general coverage receiver between 100KHz and
30MHz with thirty 1МН2 segments. The Up-conversion system using a high side IF and Microcomputer Control System make
these capabilities possible.
In addition to these, the low-pass filters switched фу rotary relay and the band-pass filters selected Бу ап electric signal from
the BAND UP/DOWN button, make а по tune-up system.
DUAL 10Hz STEP DIGITAL VFO
The dual digital VFO consists of the PLL unit, which has a triple looped Phase-Locked-Loop, and the LOGIC unit, used to
control the PLL, has the Microcomputer Control System.
Three tuning frequency resolutions of 10Hz, 100Н2 and 1KHz steps are selectable with the TS button and the TUNING
RATE SELECT switch. Two separate МЕО" can be used independently іп the SIMPLEX operation, and any desired in band
frequency split transmit/receive in the DUPLEX operation.
OUTSTANDING RECEIVER PERFORMANCE
The ІС-720А employs a dual conversion superheterodyne system which has the first ЇР at 39.7315MHz and the second IF at
9.0115MHz.
The RF amplifier circuit is a wide band push-pull amplifier using low-noise and wide dynamic range junction FET's, and
the mixer is a high level Double Balanced Mixer developed by ICOM.
These advanced devices and system give higher spurious response rejection ratio, higher sensitivity and wider dynamic range.
PASS-BAND TUNING AND SPEECH PROCESSOR
The ІС-720А has a built-in Pass-Band Tuning system developed by ICOM that allows you to continuously adjust the pass
band of the IF. By turning the control, you can eliminate interference from а nearby signal, thus providing clear reception.
It can also be used as a tone control. During transmit, the Pass-Band Tuning circuit can be used as a Speech Processor provid-
ing increased "talk power" for outstanding DXing.
ADDITIONAL CIRCUITS
The ІС-720А has a built-in Noise Blanker, VOX, CW Monitor, АРС, SWR detector, and many other circuits for your соп-
venience.
The 1С-720А has everything you need to really enjoy HF operation, in an extremely compact, rugged transceiver.
Et ДР