Icom IC-R8500 Instruction Manual - Page 18

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4 RECEIVE FUNCTIONS D Noise 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 distorted. In such cases, the noise blanker should be turned OFF. D Audio peak filter The APF (audio peak filter) adjusts the peak frequency 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. Œ Push the [APF] switch.  Rotate the [APF] control to adjust the peak fre- quency. Ž To change the filter width*, push [APF] for 1 sec. *Available for SSB, CW and AM only. D BFO adjustment BFO stands for beat frequency oscillator. This function is useful in conjunction with the IF shift function. When eliminating interference with the IF shift function, 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. Œ Push [SSB/CW] to select SSB or CW mode.  Push [SSB/CW] for 1 sec. to activate the function. • BFO appears. Ž Rotate [M-CH] to adjust the BFO. • -1.2 kHz to +1.2 kHz are selectable. D AGC function 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 indicator appears when AGC slow is selected. [NB/AFC] SCAN SET switch NB OFF NB ON [APF] switch SCAN SET [APF] control APF is selected APF-N is selected [dB] [dB] 0 0 -10 -10 -20 -20 -30 -30 -40 -40 500 1k 2k 5k [Hz] 500 1k 2k 5k [Hz] BFO 0.00kHz [SSB/CW] switch BFO shift can be set for USB, LSB and CW separately. SCAN SET [M-CH] selector AGC-F RECV ICOM- [AGC] SCAN SET switch 15

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15
4
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.
Push the [APF] switch.
Rotate the [APF] control to adjust the peak fre-
quency.
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.
Push [SSB/CW] to select SSB or CW mode
.
Push [SSB/CW] for 1 sec. to activate the function.
•
BFO
appears.
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
0
[dB]
500
1k
2k
5k
[Hz]
–40
–30
–20
–10
0
[dB]
APF is selected
APF-N is selected
[NB/AFC]
switch
[APF] control
[APF]
switch
[SSB/CW]
switch
[M-CH]
selector
[AGC]
switch
BFO shift can be set for USB,
LSB and CW separately.