Icom IC-7100 Advanced Instructions - Page 9

Frequency band: HF, 50/70 MHz, Frequency band: 144/430 MHz, NOTCH KEY, Mode = Auto notch, SSB/AM/FM - tuner

Page 9 highlights

Previous view 1 PANEL DESCRIPTION Controller - Front panel (Continued) PWR AF RF/SQL i7100 TX / RX CLR M-CH BANK PBT RIT RIT TUNER/CALL MENU NB NR MIC/RF PWR SPEED/PITCH P.AMP ATT NOTCH DR SET QUICK AUTO TUNE RX�CS SPEECH XFC MPAD !5 !6 !5 P REAMP•ATTENUATOR KEY P.AMP ATT ❍ PREAMP KEY Operation (p. 5-2) (Frequency band: HF, 50/70 MHz) Push to select one of two receive RF preamplifiers, or to bypass them. • "P. AMP1" is a wide dynamic range preamplifier. It is most effective for the 1.8 to 21 MHz bands. • "P. AMP2" is a high-gain preamplifier. It is most effective for the 24 to 70 MHz bands. • No indicator appears when the preamplifiers are not selected. ✔ What is the preamplifier? The preamplifier amplifies signals in the front end to improve the S/N ratio and sensitivity. Select "P. AMP1" or "P. AMP2" when receiving weak signals. (Frequency band: 144/430 MHz) Push to turn the preamplifier ON or OFF. • "P.AMP" appears when the preamplifier is ON. ❍ ATTENUATOR KEY Operation (p. 5-2) ➥ Hold down for 1 second to turn ON the attenuator. • "ATT" appears when the attenuator is ON. ➥ Push to turn OFF the attenuator. • "ATT" disappears. ✔ What is the attenuator? The attenuator prevents a desired signal from being distorted when very strong signals are near it, or when very strong electromagnetic fields, such as from a broadcasting station, are near your location. !6 NOTCH KEY NOTCH (p. 5-10) (Mode = Auto notch: SSB/AM/FM Manual notch: SSB/CW/RTTY/AM) ➥➥In the SSB and AM modes, push to toggle the notch function between auto, manual and OFF. • Either the Auto or Manual notch function can be turned OFF in the "[NOTCH] Switch (SSB)/(AM)" items of the "Function" Set mode. (p. 17-21) SET > Function > [NOTCH] Switch (SSB) SET > Function > [NOTCH] Switch (AM) ➥➥In the FM mode, push to turn the Auto Notch function ON or OFF. ➥ In the CW or RTTY mode, push to turn the Manual Notch function ON or OFF. • "MN" appears when the Manual Notch function is ON. • "AN" appears when the Auto Notch function is ON. • No indicator appears when the notch filter is OFF. ➥ Hold down for 1 second to display the "NOTCH" screen. Push to return to the previous screen. • Rotate the Dial to adjust the notch frequency to reject an interfering signal when the manual function is ON. • Notch filter center frequency: SSB/RTTY: -1040 Hz to +4040 Hz CW: CW pitch frequency -2540 Hz to CW pitch frequency +2540 Hz AM: -5060 Hz to +5100 Hz ✔ What is the notch filter? The notch filter is a narrow filter that eliminates unwanted CW or AM carrier tones, while preserving the desired voice signal. The DSP circuit automatically adjusts the notch frequency to effectively eliminate unwanted tones. 1-5

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1
PANEL DESCRIPTION
1-5
!
5
PREAMP•ATTENUATOR KEY
P.AMP
ATT
PREAMP KEY Operation (p. 5-2)
(Frequency band: HF, 50/70 MHz)
Push to select one of two receive RF preampli-
fiers, or to bypass them.
“P. AMP1” is a wide dynamic range preamplifier. It is
most effective for the 1.8 to 21 MHz bands.
“P. AMP2” is a high-gain preamplifier. It is most effec
-
tive for the 24 to 70 MHz bands.
No indicator appears when the preamplifiers are not
selected.
What is the preamplifier?
The preamplifier amplifies signals in the front end
to improve the S/N ratio and sensitivity. Select “P.
AMP1” or “P. AMP2” when receiving weak sig-
nals.
(Frequency band: 144/430 MHz)
Push to turn the preamplifier ON or OFF.
• “P.AMP” appears when the preamplifier is ON.
ATTENUATOR KEY Operation (p. 5-2)
Hold down for 1 second to turn ON the attenu-
ator.
• “ATT” appears when the attenuator is ON.
Push to turn OFF the attenuator.
• “ATT” disappears.
What is the attenuator?
The attenuator prevents a desired signal from be-
ing distorted when very strong signals are near it,
or when very strong electromagnetic fields, such
as from a broadcasting station, are near your lo-
cation.
!
6
NOTCH KEY
NOTCH
(p. 5-10)
(Mode = Auto notch:
SSB/AM/FM
Manual notch: SSB/CW/RTTY/AM)
In the SSB and AM modes, push to toggle the
notch function between auto, manual and OFF.
• Either the Auto or Manual notch function can be turned
OFF in
the “[NOTCH] Switch (SSB)/(AM)” items
of the
“Function” Set mode. (p. 17-21)
SET
> Function >
[NOTCH] Switch (SSB)
SET
> Function >
[NOTCH] Switch (AM)
In
the
FM mode, push to turn the Auto Notch func-
tion ON or OFF.
In
the
CW or RTTY mode, push to turn the Manual
Notch function ON or OFF.
“MN” appears when the Manual Notch function is
ON.
• “AN” appears when the Auto Notch function is ON.
No indicator appears when the notch filter is OFF.
Hold down for 1 second to display the “NOTCH”
screen.
Push to return to the previous screen.
• Rotate the Dial to adjust the notch frequency to reject
an interfering signal when the manual function is ON.
• Notch filter center frequency:
SSB/RTTY: –1040 Hz to +4040 Hz
CW:
CW pitch frequency –2540 Hz to
CW pitch frequency +2540 Hz
AM:
–5060 Hz to +5100 Hz
What is the notch filter?
The notch filter is a narrow filter that eliminates un-
wanted CW or AM carrier tones, while preserving
the desired voice signal. The DSP circuit automati-
cally adjusts the notch frequency to effectively elimi
-
nate unwanted tones.
Controller — Front panel (Continued)
PBT
RIT
TX / RX
PWR
AF
RF/SQL
CLR
M-CH
BANK
RIT
TUNER/CALL
MENU
MIC/RF PWR
NB
SPEED/PITCH
SET
QUICK
NOTCH
DR
AUTO
TUNE
RX
CS
XFC
SPEECH
MPAD
NR
P.AMP
ATT
i7100
!
6
!
5