PRE-AMP/ATT
The pre-amplifier can improve recep�on of some weak signals in the higher
frequency bands. These are normally the bands above 20 meters.
1. Press the [PRE] bu�on at the bo�om of the screen in momentarily and the
character P will appear on the top le� corner of the screen indica�ng that
the pre-amplifier is turned on.
2.
Press the [PRE] bu�on again and the character A will appear on the top le�
corner of the screen, indica�ng that the a�enuator is turned on.
3. Press the [PRE] bu�on again and no character will appear on the top le�
corner of the screen, indica�ng that neither preamp nor a�enuator are
engaged.
Pulse Interface Suppressor – Noise Blanker
Pulse interference suppression can effec�vely eliminate some kinds of pulse
noise, especially interference caused by automobile igni�on systems.
1. Press the [NB] bu�on at the bo�om of the screen momentarily to enter the
NB func�on se�ng - and a corresponding menu will display on the screen
where the DSP filter graphic normally is.
NOTE:
You should experiment with the AGC Off mode only if the received signal is not
changing in strength due to fading (QSB). You must manually control the RF
gain level so that you do not have distor�on from the incoming signal
overloading the receiver. Set AGC to “off”, then go into the RF gain se�ng
(Hold the AGC bu�on in for 2 seconds) then adjust the main knob un�l the
signal sounds clear. This can result in a nice improvement of signal quality
under good receiving condi�ons, especially for weak signals!
The receiver is sensi�ve enough that under 18mhz, no improvement of the
signal to noise ra�o will occur with use of the pre-amp. To maintain the best
recep�on performance, limit use of the pre-amp to bands above 20 meters.
When the S meter displays that the received signals exceeds S9+20dB,
turning on the a�enuator is recommended to provide be�er recep�on.
VISIT RADIODDITY.COM FOR DOWNLOADS AND HELP
23
Содержание G90
Страница 1: ...HF Transceiver Version 4 2 1 January 2022 G90 Opera on manual XIEGU ...
Страница 2: ...Ultra Miniature 24 Bit SDR ...
Страница 58: ...XIEGU ...