Power Ground; Circuit Ground; 8300 Front Panel - Orban Optimod-FM 8300 Operating Manual

OPTIMOD-FM DIGITAL

Whenever coaxial cable is used, shields are automatically grounded at both ends
through the terminating BNC connectors.

Power Ground


Ground the 8300 chassis through the third wire in the power cord. Proper
grounding techniques never leave equipment chassis unconnected to power /
earth ground. A proper power ground is essential for safe operation. Lifting a
chassis from power ground creates a potential safety hazard.

Circuit Ground

To maintain the same potential in all equipment, the circuit (audio) grounds must be
connected together:

Circuit and chassis ground should always be connected by setting the 8300's
G L
ROUND IFT
reo encoder is driving an unbalanced exciter input. (Many older exciters have
unbalanced inputs.) This is an unbalanced-to-unbalanced connection, so set the
8300's G
ROUND
wise occur.
Alternately, you can balance and float the exciter input with the Orban
CIT25 Composite Isolation Transformer — see page 2-8.

In high RF fields, the system is usually grounded through the equipment rack in
which the 8300 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.

8300 Front Panel


Screen Display labels the four soft buttons and provides control-setting infor-
mation.

Screen Contrast button adjusts the optimum viewing angle of the screen dis-
play.

Four Soft buttons provide access to all 8300 functions and controls. The func-
tions of the soft buttons change with each screen, according to the labels at the
bottom of each screen.
 Next and Prev ( and ) buttons scroll the screen horizontally to accommo-
date menus that cannot fit in the available space. They also allow you to move
from one character to the next when you enter data into your 8300.
switch to its G
ROUND
L switch to L
IFT IFT
connect position, except when the 8300's ste-
to break the ground loop that would other-
2-11
INSTALLATION