Noise blanker, Audio peak ﬁlter, BFO adjustment

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]

–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
controls receiver gain to produce a constant audio	RECV	ICOM-
output level even when the received signal strength	RECV	ICOM-
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.	[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.

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.

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

Models: IC-R8500