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5.00 USING THE PX50 FRONT PANEL INTERFACE
5.01 Navigation Control and Display
The PX50 has 17 menus that either display settings, enable the user to adjust settings,
or both. The first 4 menus are display menus only, and the remaining menus allow ad-
justments to be made to the various controls and settings.
The five navigation/adjustment control keys are located on the front panel of the PX50
and allow user control and display of all necessary settings. The Up/Down arrow keys
are used to navigate from one menu to the next. The Left/Right arrow keys are used to
adjust specific settings in the adjustment menus. The Enter key is used to either toggle
a specific mode on/off, or to "enter" into a field within a menu to manually edit and set
a numeric value. With this edit entry mode, the Left/Right arrow keys select which digit
is to be adjusted, and the Up/Down arrow keys increment or decrement that specific
digit. The Enter key is then pressed to "set" that numeric value and go back to the previ-
ous menu.
NOTE: When you make changes to the adjustment screens, the changes are immedi-
ately saved to the EEPROM of the microcontroller when you scroll to the next screen.
If you do not scroll to the next screen, the PX50 assumes you are simply testing this
change and will not save it during a power cycle. Again, the Up/Down arrow keys are
used to change to the next/previous menu screens. Be sure to go to the next screen
after your changes to assure that they have been saved to memory. If the PX50 is
turned off before navigating to the next screen, all changes made to that menu screen
will be lost.
5.02 General Display
The PX50 defaults to this screen upon power up. It
displays frequency in MHz, left and right audio lev-
els, the PLL lock status (Y = locked, N = unlocked),
Power amp temperature in degrees Celsius, and the measured RF power output in
Watts.
5.03 Audio Display
This displays the left and right peak hold meters for
modulation level setting. The 0dBu level is corre-
sponds to the first 13 solid "bars" of meter, and the
remaining 5 solid bars correspond to higher than 0 dBu. Try not to exceed this level
since it represents close to 100% modulation.
5.04 VSWR (Voltage Standing Wave Ratio) Display
This screen displays the measured forward power,
reverse power, and VSWR of your antenna - ampli-
fier match. Ideally, VSWR should be 1.25 or less
(1.0 is a perfect match). A higher VSWR indicates a poor antenna match. This results in
reduced transmission range, higher operating temperature in the power amplifier stage,
and could shorten the expected life of some components.
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