Icom IC-7300 Instruction Manual basic - Page 35

Noise Blanker, IP Plus function

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4 RECEIVING AND TRANSMITTING Selecting the IF filter shape (Continued) ••SHARP This selection is to emphasize the passband width of the filter. The filter has an almost ideal shape factor. Signals of the out of passband are extremely filtered out and it gives you better audio quality. ••SOFT The filter shoulders are roundly formed as in analog filters. This decreases noise components in the high and low frequencies of the filter passband and increases the S/N of the target signal. These characteristics play an effective role in picking up very weak signals in the 50 MHz band, for example. The shape factor is kept, and the sharpness of the bandpass is excellent. IP Plus function The IP Plus function improves the Intermodulation Distortion (IMD) quality by exerting the direct sampling system performance. This function optimizes the Analog/Digital Converter (ADC) against the distortion when you receive a strong input signal. It also improves the Third-order Intercept Point (IP3) while minimizing the reduction of the receive sensitivity. 1. Push FUNCTION . ••The FUNCTION screen is displayed. 2. Touch [IP+]. LTouch [IP+] to turn the IP Plus function ON or OFF. LSelect ON to prioritize the IP quality, and select OFF to prioritize the receive sensitivity. 3. To close the FUNCTION screen, push EXIT . ••"IP+" is displayed when ON is selected. Displayed Noise Blanker The Noise blanker eliminates pulse-type noise such as the noise from car ignitions. 1 The Noise blanker cannot be used in the FM mode. 2 Push NB to turn the Noise Blanker ON or OFF. 3 Displayed 4 NOTE: When using the Noise Blanker, received signals 5 may be distorted if they are excessively strong or the noise is other than a pulse type. In that case, turn the OFF Noise 6 Blanker, or shallow the DEPTH on the NB menu. See the description below for details. 7 DDAdjusting the NB level and time 8 To deal with various type of noise, you can adjust the attenuation level and noise width in the NB menu. 9 1. Hold down NB for 1 second. ••Turns ON the Noise Blanker and opens the NB menu. 10 2. Touch the adjusting item. (Example: DEPTH) 11 12 13 14 3. Adjust the level. (Example: 8) 15 Rotate 16 17 Push 18 19 LEVEL 20 (Default: 50%) Adjust the level where the Noise Blanker activates 21 between 0 and 100%. DEPTH (Default: 8) Adjust the noise attenuation level between 1 and 10. WIDTH (Default: 50) Adjust the blanking duration time between 1 and 100. 4-5

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4
RECEIVING AND TRANSMITTING
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
4-5
Noise Blanker
The Noise blanker eliminates pulse-type noise such
as the noise from car ignitions.
The Noise blanker cannot be used in the FM mode.
Push
NB
to turn the Noise Blanker ON or OFF.
Displayed
NOTE
: When using the Noise Blanker, received signals
may be distorted if they are excessively strong or the noise
is other than a pulse type. In that case, turn the OFF Noise
Blanker, or shallow the DEPTH on the NB menu.
See the description below for details.
D
Adjusting the NB level and time
To deal with various type of noise, you can adjust the
attenuation level and noise width in the NB menu.
1. Hold down
NB
for 1 second.
•
Turns ON the Noise Blanker and opens the NB menu.
2. Touch the adjusting item.
(Example: DEPTH)
3. Adjust the level.
(Example: 8)
Rotate
Push
LEVEL
(Default: 50%)
Adjust the level where the Noise Blanker activates
between 0 and 100%.
DEPTH
(Default: 8)
Adjust the noise attenuation level between 1 and 10.
WIDTH
(Default: 50)
Adjust the blanking duration time between 1 and 100.
IP Plus function
The IP Plus function improves the Intermodulation
Distortion (IMD) quality by exerting the direct sampling
system performance.
This function optimizes the Analog/Digital Converter
(ADC) against the distortion when you receive a
strong input signal. It also improves the Third-order
Intercept Point (IP3) while minimizing the reduction of
the receive sensitivity.
1. Push
FUNCTION
.
• The FUNCTION screen is displayed.
2. Touch [IP+].
L
Touch [IP+] to turn the IP Plus function ON or OFF.
L
Select ON to prioritize the IP quality, and select OFF
to prioritize the receive sensitivity.
3.
To close the FUNCTION screen, push
EXIT
.
• “IP+” is displayed when ON is selected.
Displayed
•
SHARP
This selection is to emphasize the passband width of
the filter. The filter has an almost ideal shape factor.
Signals of the out of passband are extremely filtered
out and it gives you better audio quality.
•
SOFT
The filter shoulders are roundly formed as in analog
filters. This decreases noise components in the
high and low frequencies of the filter passband
and increases the S/N of the target signal. These
characteristics play an effective role in picking up
very weak signals in the 50 MHz band, for example.
The shape factor is kept, and the sharpness of the
bandpass is excellent.
Selecting the IF filter shape (Continued)