Orban OPTIMOD-FM 8600, Operating Manual

Page: 73 / 397

OPTIMOD-FM DIGITAL INSTALLATION
2-13
If you encounter a ground loop when feeding an unbalanced exciter in-
put, you can balance and float the it with a Jensen JT-123-BMCF trans-
former (see page 2-15).
•
In high RF fields, the system is usually grounded through the equipment rack in
which the 8600 is mounted. The rack should be connected to a solid earth
ground by a wide copper strap—wire is completely ineffective at VHF because of
the wire’s self-inductance.
8600 Front Panel
•
Headphone Jack allows you to monitor the output of the processing through
headphones. Headphone impedance should be 75
Ω
or higher.
•
You can switch the headphone feed to receive the digital radio (HD) signal, the
low-delay monitor signal, or the analog FM-processed signal before the diversity
delay. This control is located on the
I
NPUT
/O
UPUT
> O
UTPUT
2
screen.
•
Headphone Level Control (the small blue control knob to the right of the jack)
adjusts headphone output.
•
The red
Enter
button allows you to choose pop-up menu items, icons and but-
tons. If you are in the Preset screen, it allows you to put a Factory or User Preset
on-air once you have selected it.
If you edit a Factory Preset, you must save it as a new User Preset to re-
tain your edit permanently. Even if not saved, your edited preset will be
retained automatically even if the 8600 is powered down and will be re-
stored on-air upon power-up. If not saved, your edited preset will appear
in the RECALL list of available presets as the name of its parent present
prefixed by the abbreviation “modif” (for “modified”).
However, if you edit another preset before you save your old modified
preset, your old edited preset will be lost—the 8600 automatically retains
only one “modified” preset. Therefore, it is wise to rename and save any
edited preset you wish to keep, using the 8600’s SAVE main menu item.
This ensures that your edited preset will not be overwritten accidentally.
•
The green joystick, labeled Locate , is a pointing device that allows you to navi-
gate to settings and controls on each screen. Pressing and holding the knob left
or right moves you to the previous and next function screens (when multiple
screens are available).
•
A yellow Escape button allows you to navigate quickly to underlying screens,
higher-level screens or the Meters screen and displays the pop-up menu.
When a pop-up item, like Menu, is onscreen,
E
SCAPE
always returns you
to the underlying screen.
Pressing
E
SCAPE
from a secondary screen page, like System Setup > Place /
Date / Time 1 takes you back to the top level; in this case, the System Set-
up screen.