Display Description And Basic Operation - microHAM DXP Manual

microHAM © 2019 All rights reserved

Display Description and Basic Operation

The display of DXP provides real time information about incoming RX audio level, its gain or attenuation,
TX output level, indicates CAT data transfer, a clipping warning if the RX input level is too high, and
provides data output monitoring for CW and FSK. It also serves as user interface for setting DXP
operating parameters in SETUP menu.
There are five real time screens, three fixed and two automatic. The automatic screens are output
monitors for CW and FSK – when data are sent, that data is shown scrolling through the display. When
there is no more data to send the display returns to the last used fixed screen.
Fixed screens are TX audio screen, RX MAIN audio screen for the main receiver of your transceiver and
the RX SUB audio screen for SUB receiver, if your transceiver has two receivers. The TX screen is
invoked by pressing TX button. The number next to the VU-METER indicates the currently set output
level as a percentage of the maximum available output from DXP.
Adjusting TX level is individual for every radio. The golden rule is that the level should be set for
maximum RF output power at minimum or no ALC drive. This can be easily accomplished by observing
the RF output meter and ALC meter on your transceiver simultaneously. Adhering to this rule assures
that the output signal is as clean as it gets without excessive IMD products and as strong as you set by
RF output level on your transceiver.
RX MAIN screen is invoked by pressing the RX button. You can alternate between RX MAIN and RX
SUB screens by pressing the knob. The number next to the VU-METER on these screens indicates
digital gain or attenuation in dB of the input signal fed to the computer for audio processing in digital
mode programs. The CLIP sign on the top right corner of the display indicates that the level of signal
into the DXP is too high. If you see this sign, you need to decrease the receive audio output signal level
in your transceiver menu. Some programs like WSJT-X for FT8 mode require a certain level of noise for
processing, use knob to adjust for the recommended level. In most other cases, setting 0-10dB gain
provides the best performance for weak signal operation in RTTY or other digital modes.
Pressing both TX and RX buttons at the same time enters the DXP SETUP MENU which enables to
adjust the operating parameters of DXP. Individual SETUP MENU items are described separately in the
DXP SETUP MENU chapter.
7