Icom IC-R8500 instruction manual Noise blanker, Audio peak filter, BFO adjustment, Dagc function

Page 18

4 RECEIVE FUNCTIONS

DNoise blanker

The noise blanker reduces pulse-type noise such as that generated by automobile ignition systems. This function is not effective for FM and WFM mode or for non pulse-type noise and wide width pulses.

Push [NB] to toggle the noise blanker ON and OFF.

• “NB” appears when the noise blanker is activated.

NOTE: When a strong signal is received while the noise blanker is ON, the output audio may be dis- torted. In such cases, the noise blanker should be turned OFF.

[NB/AFC] switch

NB OFF

NB ON

DAudio peak filter

The APF (audio peak filter) adjusts the peak fre- quency of the received audio. The APF can be used for adjusting the audio response. The IC-R8500 has two selectable width filters.* Use the appropriate filter width for optimum receiving.

➀Push the [APF] switch.

➁Rotate the [APF] control to adjust the peak fre- quency.

➂To change the filter width*, push [APF] for 1 sec.

*Available for SSB, CW and AM only.

[dB]

0

–10

–20

–30

–40

[APF] switch

[APF] control

 

 

 

APF is selected

APF-N is selected

 

 

 

[dB]

 

 

 

 

 

0

 

 

 

 

 

–10

 

 

 

 

 

–20

 

 

 

 

 

–30

 

 

 

 

 

–40

 

 

500 1k

2k

5k [Hz]

500 1k

2k

5k [Hz]

DBFO adjustment

BFO stands for beat frequency oscillator. This func- tion is useful in conjunction with the IF shift function. When eliminating interference with the IF shift func- tion, the audio characteristics of the received signal are often changed. Use the BFO adjustment function to adjust the audio quality of the received signal to that desired.

➀Push [SSB/CW] to select SSB or CW mode.

➁Push [SSB/CW] for 1 sec. to activate the function.

•BFO appears.

➂Rotate [M-CH] to adjust the BFO.

•–1.2 kHz to +1.2 kHz are selectable.

BFO

0.00kHz

[SSB/CW] switch

BFO shift can be set for USB,

[M-CH]

selector

LSB and CW separately.

 

DAGC function

AGC stands for automatic gain control. This function

controls receiver gain to produce a constant audio

 

AGC-F

RECV

ICOM-

output level even when the received signal strength

is varied by fading, etc. Use AGC slow for normal

 

 

phone operation; AGC fast for receiving data and

 

 

searching for signals. AGC time constant cannot be

 

 

changed in FM and WFM modes.

[AGC]

Push [AGC] to toggle between AGC fast and slow.

switch

•AGC-F appears when AGC fast is selected; no indi- cator appears when AGC slow is selected.

15

Page 17 Page 19
Image 18
Page 17 Page 19
Contents IC-r8500 Accessories included with the IC-R8500 Qty Explicit DefinitionsTable of Contents Front panel ➋ SLEEP/SET Switch SLEEP/SETPanel Description ➎ Headphone Jack Phones5SPEECH/LOCK Switch SPCH/LOCK 7MAIN Dial@0S-METER @7SCAN Switches Scan Scan SET Prio p Skip pAuto p DLY D/S pRear panel Function display 7ATTENUATOR Indicators9RECEIVE Indicator MHz kHzLocation Mounting installationConnections Receiver standRequired connections PL-259 Connector Installation Example Using a long wire antenna for HF bandsTYPE-N Connector Installation Example Antenna connection GroundingTransceive function Connecting to a PCTape recorder connections Data demodulation terminalExample Setting the Frequency Using the Keypad Frequency SettingUsing the keypad Read me firstSetting the programmable tuning step Using the main dialSelecting a tuning step Setting the lock function coverageInitial settings Mode selectionReceive Functions Functions for FM Center indicatorSquelch function Functions for SSB/CWAudio peak filter BFO adjustmentNoise blanker Dagc functionConnections For high speed data 9600 bps reception in FM modeData communications Receiving methodGeneral Bank Initial Contents UsageMemory Channels Bank selectionChannel selection Using the M-CH selectorUsing the keypad Bank limit functionProgramming Copy and paste memory editingClearing Channel/bank names Channel name programmingBank name programming Assigning channel numbers Deleting memory channelsTo rearrange bank channel assignments Adding/inserting memory channels ➂ Rotate M-CH to select the following➃ Push Bank for 1 sec. to perform the selected operation Memory scan ScansOperation Memory select scanDProgrammed scan Priority scan Mode select functionSpecifying skip channel and frequency Specifying skip channelsAutomatic bank limit/skip functions Voice scan control functionTurning OFF the automatic function Scan resume condition Scan speed/delay functionsProgramming scan edge frequencies OFF DLY ∞Assigning a function to the DELAY/SPEED control Scan delayScan speed Sleep Timer OperationSelecting initial set mode SET ModeSelecting quick set mode Display Example Quick SET ModeQuick set mode items Initial set mode items Installed, you can select between faster or slower When the optional UT-102 Voice Synthesizer Unit isInstalled, you can select between English This item sets the data transfer rate. When AutoIf OUT jack Connector InformationRS-232C socket Remote jack AGC OUT jackREC OUT jack DC 13.8 V and DC in socketsREC Remote jack Phones jackData format Control CommandsCommand table Basic format from PC to IC-R8500‘NG’ message from IC-R8500 to PC Memory channel contents set & write 1A‘OK’ message from IC-R8500 to PC Special bank number and channels bnMaintenance Optional Installations ➂Replace the top coverCR-293HIGH Stability Crystal Unit General OperationTV-R7100 specifications TV receiverTroubleshooting Memory Channels Scan Problem Possible Cause Solution Specifications GeneralReceiver FL-52ACW Narrow Filter 455 kHz 500Hz/-6 dB OptionsAH-7000 AD-55/A/V AC AdapterCount on us

IC-R8500 specifications

The Icom IC-R8500 is a highly regarded general-purpose receiver that has made its mark among amateur radio enthusiasts and professionals alike. This versatile communication receiver is known for its wide frequency coverage, advanced features, and robust design, making it a valuable tool for various applications, including shortwave listening, public safety communication, and aircraft monitoring.

One of the standout features of the IC-R8500 is its extensive frequency coverage. It spans a range from 0.1 MHz to 3 GHz, allowing users to access a wide spectrum of signals. The receiver includes coverage of HF, VHF, UHF, and even microwave bands, making it suitable for listening to everything from amateur radio transmissions to satellite communications.

The receiver employs a high-performance double-conversion superheterodyne architecture, which contributes to its excellent sensitivity and selectivity. The advanced RF circuitry minimizes interference and enhances the clarity of received signals. Users can expect outstanding audio quality and a wide dynamic range, even in challenging reception conditions.

Digital Signal Processing (DSP) is another key technology incorporated into the IC-R8500. The DSP capabilities allow users to apply noise reduction and filtering techniques to improve the quality of the received audio. Features such as automatic notch filtering and IF filtering help eliminate unwanted noise, enhancing the listening experience.

The IC-R8500 is equipped with a large, easy-to-read LCD display that provides information on frequency, mode, signal strength, and other essential parameters. The user-friendly interface simplifies operation, allowing quick access to various settings and functions. Additionally, the receiver supports various modulation modes, including AM, FM, SSB, and CW, catering to different listening preferences.

For those seeking enhanced connectivity, the IC-R8500 offers multiple options, including an audio output jack, and external speaker connections. It also has a built-in memory function, allowing users to store and recall favorite frequencies easily. The receiver can be controlled via a computer interface, offering versatility for advanced users and programmers.

In summary, the Icom IC-R8500 stands out for its wide frequency range, superior sensitivity, and advanced features powered by DSP technology. Its robust construction and user-friendly design make it a favorite among communications enthusiasts seeking a reliable and versatile receiver for various applications. Whether for hobbyist listening or professional use, the IC-R8500 remains a top choice in the world of radio receivers.
Top Page Image Contents