Important Receiver Settings; Ant (Switching The Antenna); Att (Attenuator); Ipo - Yaesu FTDX101MP Operation Manual

Important Receiver Settings

The status of various operations that are important during receive, are shown at the bottom of the display.
To change a setting, touch the appropriate location on the display.

ANT (Switching the Antenna)

The currently used antenna terminal number
("ANT 1" "ANT 2" "ANT 3 / RX") is displayed.
After touching ANT, touch the desired number.
The antenna can be set separately for each oper-
ation band.
The antenna terminal "ANT 3 / RX" can be set
to "Receive Only" (Set Menu: "ANT 3 SELECT"
page 97).

ATT (Attenuator)

Displays the current ATT (Amount of receive input
signal attenuation).
When the desired signal is extremely strong or
the noise level is high on a low frequency band,
activate the attenuator to reduce the incoming
signal or noise from the antenna.
After touching [ATT], touch the desired attenua-
tion amount.
The attenuator is set independently for each op-
eration band.
OFF Attenuator is Off
The incoming signal power is reduced by
6dB
6dB (Signal voltage reduced to 1/2)
The incoming signal power is reduced by
12dB
12dB (Signal voltage reduced to 1/4)
The incoming signal power is reduced by
18dB
18dB (Signal voltage reduced to 1/8)
• If the noise level is high or the received signal
is extremely strong, the incoming signal level
can be suppressed with the IPO/ATT settings.
If the S-meter fluctuates S-3 or more in the
noise level, or the received signal is extremely
strong and it causes a high S-meter indication
(+20dB or more), activate the attenuator.
• Since IPO does not only attenuate the incom-
ing signal, but also improves the cross mod-
ulation characteristic, try to activate the IPO
first. If the signal is still strong, also use the
ATT. In this way, you can attenuate the incom-
ing signal and noise effectively.
22
Important setting items when receiving

IPO

The IPO (Intercept Point Optimization) function
can establish the gain of the RF amplifier section
to accommodate the connected antenna and the
received signal conditions. IPO can be selected
from three operating conditions.
AMP1: One stage RF amplifier is connected.
AMP2: Two RF amplifiers are connected in se-
IPO:
After touching [IPO], touch the desired operating
condition.
This is a well-balanced operation of re-
ceiver sensitivity and characteristics (Ap-
proximately 10 dB gain).
ries to give top priority to sensitivity (Ap-
proximately 20 dB gain).
The received signal is input to the IF mix-
er without passing through the RF ampli-
fier. This can greatly improve receiving,
especially in the harsh low band signal
environment.
• IPO is set independently for each operation
band.
• Normally, select "AMP1".
• The IPO can not only attenuate the input sig-
nal but also improve the intermodulation char-
acteristics. It is most effective to operate the
IPO first, and then use the ATT if the signal is
still too strong. The noise level can be attenu-
ated and S/N greatly improved.