Icom IC-R71A Instruction Manual page 4

SECTION 2 FEATURES
GENERAL COVERAGE RECEIVER CAPABILITY
The IC-R71 is a general coverage receiver between 100KHz and 30MHz with thirty 1MHz 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 and the band-pass filters selected by an electronic signal from the BAND UP/DOWN
button, make a no tune-up system.
DUAL 10Hz STEP DIGITAL VFO
The dual digital VFO consists of the PLL unit, which has a dual looped Phase-Locked-Loop, and the LOGIC unit used to
control the PLL, has the Microcomputer Control System.
Normal tuning rate is in 10Hz increments and increasing the speed of rotation of the main tuning knob shifts the tuning to
50Hz increments automatically. Pushing the tuning speed button gives 1KHz tuning. Digital outputs are available (as an
option) for computer control of the receiver frequency and functions, and for a synthesized voice frequency readout.
10-KEY KEY PAD
10-KEY key pad is provided in order to set a desired frequency easily and faster. By pushing digit keys in order of the
desired frequency digits, the operating frequency will be changed without changing the band and turning the tuning control.
32 MEMORIES
Thirty two tunable memories are provided to store mode and frequency, and the internal RAM is backed up by an internal
lithium memory backup battery to maintain the memories for up to seven years. Scanning of frequencies, memories and
bands are possible from the unit. In the Mode-S mode, only those memories with a particular mode are scanned; others are
bypassed. Data may be transferred between VFO's, from VFO to memories, or from memories to VFO.
OUTSTANDING RECEIVER PERFORMANCE
Utilizing an ICOM developed J-FET DBM, the IC-R71 has a 105dB dynamic range. The 70.4515MHz first IF virtually
eliminates spurious responses, and a high gain 9.0115MHz second IF, with ICOM's PBT selectivity. A deep IF notch filter,
adjustable AGC and noise blanker (can be adjusted to eliminate the woodpecker noise), audio tone control, clear reception
even in the presence of strong QRM or high noise levels. A low noise receiver preamp provides exceptional reception sensi-
tivity as required.
PASS-BAND TUNING
The IC-R71 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 a nearby signal, thus providing clear reception.