X and JS8Call documentation recommends when the band is empty, the signal strength meter on
the bottom left should be at about +30dB.
Frequency min.: When you command a new frequency via CAT (from WJST-X etc), this is the
lower limit of this band definition.
Frequency center: The center frequency, which is the frequency of the vertical blue line seen in
the RF sweeps, the test frequency for AF sweeps, and is the frequency used by the Transmitter
Test screen. It doesn't have any other purpose and doesn't have to be the actual center (half way
between min and max).
Frequency max.: When you command a new frequency via CAT (from WSJT-X etc), this is the
upper limit of this band definition .
Sweep start: the start frequency for the RF sweep screen. Note that the minimum measurable
frequency is 375 / MS Divider (see Band name section above, for details on MS Divider). If the
sweep starts on an non-measurable frequency, the actual graph line will not start until a
measurable frequency occurs.
Sweep step: the step frequency for each point of the RF sweep plot screen. Similarly to the above
(Sweep start), the maximum measurable frequency is 1150 / MS Divider and points above this are
not plotted on the graph.
BPF number (0-3): The Band Pass Frequency selection for this band.
LPF number (0-2): the Low Pass Frequency selection for this band.
PIN fwd bias (mA): Specifies the forward current, in mA, to be driven through each of the two PIN
diode switches either side of the Low Pass Filter during transmit. The adjustment range is 5 to
60mA. The default value is 30mA and should generally be left alone.
Transmit: Enabled or Disabled, to allow or prevent transmission on this band. Press the E key to
enable, D key to disable.
TX PTT +5V: To enable or enable, for this band, whether +5V appears on the PTT connector
"ring" connection during transmit. Press the E key to enable, D key to disable.
This output is designed to directly interface with the QCX-series 50W Power Amplifier with a
simple stereo jack audio cable. Remember, the 50W PA is a SINGLE BAND amplifier so should
only be used on the QMX with a single band, unless you are going to build an external switched
Low Pass Filter. Also remember that the 50W QCX-series amplifier is designed for CW operation
and not suitable for the high duty cycle of digital modes; therefore if you wish to use this with the
QMX transceiver in digital modes, be sure to limit it to around 20-25W output power; this will be
achieved by using a 12V supply voltage to the 50W PA kit.
TX PTT grounded: To enable or disable, for this band, whether the PTT "tip" connection is
grounded during transmit. Press the E key to enable, D key to disable. This PTT output is suitable
for driving a typical grounded PTT type amplifier.
Please refer also to the hardware documentation (assembly manual) for more information on the
PTT connection, and the circuits driving it.
The PTT connector is a 3.5mm stereo jack connector. The “ring” connection can be configured as
a +5V PTT output, suitable for switching the QCX-series 50W amplifier. The “ring” connection is
also used on the 50W PA so only a standard stereo audio jack cable is required. The “tip”
connection can be configured as a grounding PTT output for connection to most other amplifiers.
QMX operang manual; rmware 1_00_012 64
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