Comtech EF Data CPA - Manual (Page 60)

CPA C-Band Indoor Solid-State Power Amplifier Revision 1
Front Panel Operation MN/CPA-IN.IOM
5–4
5.1.4 Front Panel Display
As the manufacturing process of the CPA has evolved, there have been two display layouts. As
shown in Figure 5-3:
Figure 5-3. CPA Front Panel Keypad
Display Type: Depending on the production version of the unit, older versions of the CPA
feature a Liquid Crystal Display (LCD), while all current production versions feature a Vacuum
Fluorescent Display (VFD).
Both display versions are active displays showing two lines of 24 characters each. While you may
control the brightness of either display, compared to the original LCD the blue-lit display of the
current VFD provides superior viewing characteristics and does not suffer problems of viewing
angle or contrast.
Cursor Feature: On most menu screens, you will observe a flashing solid block cursor, which
blinks at a once-per-second rate. This indicates the currently selected item, digit, or field. Where
this solid block cursor would obscure the item being edited (e.g., a numeric field) the cursor
automatically changes to an underline cursor.
Screen Saver Feature: If you were to display the same screen for weeks at a time, the display
could become ‘burnt’ with this image. To prevent this, the unit has a ‘screen saver’ feature that
activates after 1 hour. The top line of the screen saver features the display message ‘Circuit
ID:’ and a user-input text string; the bottom line reads ‘Press any key…’ .
When the screen saver activates, the message moves from right to left across the display, and
then wraps around. Pressing any key restores the previous screen.
5.2 Opening Screen
CPA-XXX-XXXX-I
Ver. X.X.X SNXXXXXXXXX
The opening screen displays whenever power is first applied to the unit. From any other nested
menu, it is accessible by pressing CLEAR repeatedly. The display identifies the specific CPA
model, its currently loaded firmware, and its unique serial number.
L ayout 1: L iquid C rys tal Diode (L C D)
(obs olete all units )
L ayout 2: Vacuum F luores cent Dis play (VF D)
(current production units )