Icom IC-R8500 D Noise blanker, D Audio peak filter, D BFO adjustment, DAGC function, 0.00kHz, Icom

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.

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