ICOM iC-r8500 User Manual download pdf (Page 18)

RECEIVE FUNCTIONS

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.

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.

q Push the [APF] switch.

w Rotate the [APF] control to adjust the peak fre-

quency.

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

*Available for SSB, CW and AM only.

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.

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

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

• BFO appears.

e Rotate [M-CH] to adjust the BFO.

•–1.2 kHz to +1.2 kHz are selectable.

AGC stands for automatic gain control. This function

controls receiver gain to produce a constant audio

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.

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

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

cator appears when AGC slow is selected.

D Noise blanker

D Audio peak ﬁlter

D BFO adjustment

D AGC function

BFO

0.00kHz

ICOM-

RECV

AGC-F

NB OFF NB ON

500 1k 2k 5k [Hz]

–40

–30

–20

–10

[dB]

500 1k 2k 5k [Hz]

–40

–30

–20

–10

[dB]

APF is selected APF-N is selected

[NB/AFC]

switch

SCAN SET

[APF] control

[APF]

switch

SCAN SET

[SSB/CW]

switch

SCAN SET

[M-CH]

selector

[AGC]

switch

SCAN SET

BFO shift can be set for USB,

LSB and CW separately.

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ICOM iC-r8500 User Manual Page 18

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