5
OTHER FUNCTIONS
5-2
Using the Digital Twin PBT
SSB, CW, FSK and AM modes
The Digital Twin PBT (Passband Tuning) electronically
narrows the IF passband width by over wrapping the
passband frequency ranges of 2 PBT filters (PBT1
and PBT2), to reject interference. The IC-R8600 uses
DSP for the PBT function.
1. Push
.
2. Touch [PBT1] or [PBT2].
3. Rotate
to adjust the passband width.
•
The current passband width (BW) and shift frequency
(SFT) is displayed.
L
A dot is displayed right below the shift frequency
indicates that the passband frequency is shifted.
•
To narrow the IF passband width, rotate
to
shift the passband width in the opposite direction from
each other.
•
To shift the pass band frequency range, match both
the [PBT1] and [PBT2].
•
The PBT is adjustable in 50 Hz steps in the SSB, CW,
and FSK modes, and 200 Hz in the AM mode. In this
case, the center shift frequency changes in 25 Hz
steps in the SSB, CW, and FSK modes, and 100 Hz in
the AM mode.
•
Touch [PBT1] or [PBT2] for 1 second to clear the PBT
setting.
4. Push
EXIT
to close the setting menu.
NOTE
:
While adjusting,
you may hear noise. This comes
from the DSP unit and does not indicate an equipment
malfunction.
IP Plus function
The IP Plus function improves the Intermodulation
Distortion (IMD) quality by optimizing the direct
sampling system performance.
This function optimizes the Analog/Digital Converter
(ADC) against the distortion when you receive a
strong input signals. It also improves the Third-order
Intercept Point (IP3) while minimizing the reduction of
the receive sensitivity.
L
Each band memorizes the ON/OFF setting.
z
Touch [IP+] on the
FUNCTION screen
.
L
Each touch turns the IP Plus function ON or OFF.
L
Select ON to prioritize the IP quality, and select OFF
to prioritize the receive sensitivity.
Notch Filter
The notch filter suppresses interference.
Auto Notch automatically attenuates beat tones,
tuning signals and so on.
The Manual Notch attenuates beat tones, tuning
signals and so on by adjusting the notching width and
frequency.
Auto Notch: Used in the SSB, AM and FM modes.
Manual Notch: Used in the SSB, CW, FSK and AM
modes.
z
Touch [NOTCH] on the FUNCTION screen.
•
Each touch changes between “AN (Auto Notch),” “MN
(Manual Notch)” and OFF.
L
In the CW or FSK mode, only Manual Notch (MN)
can be selected.
L
In the FM or DIGITAL mode, only Auto Notch (AN)
can be selected.
D
Setting the notching width and frequency
1. Touch [NOTCH] for 1 second.
L
The Notch setting menu is displayed.
2. Slowly rotate
to adjust the notching
frequency on the POSITION scale.
3. Touch [WIDTH] to select the Manual Notch filter
width from “WIDE,” “MID” or “NAR.”
NOTE
: While adjusting, noise may be heard.
This comes from the DSP unit and does not indicate
an equipment malfunction.
A dot is displayed
when the filter
frequency is shifted.
