Other Functions; About The Function Screen; Preamplifier; Attenuator - Icom IC-R8600 Instruction Manual

About the Function screen

On the Function screen, you can configure the
settings of various functions for each receiving mode.
1. Push to open the Function screen.
2. Touch (or touch for 1 second) a function key.
• Each touch turns the function ON or OFF.
• Each long touch selects an option for the
function.
L The usable functions differ, depending on the
receiving mode.
3. Push to close the Function screen.
Function screen example (in the CW mode)

Preamplifier

A preamplifier is used when receiving weak signals.
LEach band memorizes the preamplifier setting.
z Push [P.AMP] on the Function screen.
L Each touch turns the preamp ON or OFF.
NOTE:
The gain of preamplifier is approximately 20 dB on
the HF bands, 14 dB on the VHF and UHF bands.
When you use the preamplifier while receiving a
strong signal, the receiving signal may be distorted.
In such case, turn OFF the preamplifier.

Attenuator

The Attenuator prevents a desired signal from
becoming distorted when a very strong signal is near
the frequency, or when a very strong electric field.
LEach band memorizes the Attenuator setting.
z Touch [ATT] on the Function screen, to turn ON the
Attenuator.
L Each touch changes the attenuation between 10 dB
(ATT10), 20 dB (ATT20), 30 dB (ATT30) and OFF (no
indication).
L If a strong signal is received and
reduce the RF gain or turn ON the attenuator until
disappears.

OTHER FUNCTIONS

Selecting the antenna

You can use either ANT1, ANT2, or ANT3 for receiving
below 30 MHz.
1. Rotate
2. Touch the antenna connector indicator.

AGC function control

The AGC (Automatic Gain Control) produces a
constant audio output level, even when the received
signal strength varies greatly.
The receiver has 3 preset AGC settings (time
constants: FAST, MID and SLOW) for all modes
except the FM and DIGITAL mode.
1. Select the operating mode. (Example: SSB)
2. Push
3. Touch [AGC] to select an AGC setting.
4. To close the FUNCTION screen,
You can change the preset AGC time constant:
1. On the FUNCTION screen, touch [AGC] for 1 second.
2. Touch either FAST, MID or SLOW.
3. Touch an AGC preset you want to change the time
4. Rotate
5. To close the AGC screen, push
• Selectable AGC Time constant (unit: seconds)
NOTE: When you are receiving weak signals, and a strong
signal is momentarily received, the AGC function quickly
(Overflow) appears,
reduces the receiver gain. When that signal disappears, the
receiver may not receive the weak signal because of the AGC
action. In that case, select FAST, or turn OFF the AGC function.
5-1
to set a frequency to below
30 MHz (10 kHz ~ 29.999999 MHz).
• Each touch changes the selected antenna connector.
L Next time you set the same frequency, the same
antenna connector is automatically selected.
to open the FUNCTION screen.
• Each touch changes the attenuation between FAST
("AGC-F"), MID and SLOW.
L The AGC is fixed to "FAST" in the FM, WFM or Digital mode.
constant. (Example: MID)
AGC screen (in the SSB mode)
to set the time constant.
L The adjustable time constants are described in the
table below.
Mode Default
0.3 (FAST)
2.0 (MID)
SSB
6.0 (SLOW)
0.1 (FAST)
CW/FSK 0.5 (MID)
1.2 (SLOW)
3.0 (FAST)
AM 5.0 (MID)
7.0 (SLOW)
FM/WFM/
0.1 (FAST)
DIGITAL
5
.
EXIT
You can reset
to the default
settings by
touching this key
for 1 second.
.
EXIT
Adjustable time constant
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
1.6, 2.0, 2.5, 3.0, 4.0, 5.0 or 6.0
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
1.6, 2.0, 2.5, 3.0, 4.0, 5.0 or 6.0
OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
2.5, 3.0, 4.0, 5.0, 6.0, 7.0 or 8.0
Fixed
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