Operating instructions
OPTIMOD-AM DIGITAL TROUBLESHOOTING
5-7
rate modulation monitor that is causing you to undermodulate the carrier. A station
may suffer from any combination of these problems, and they can have a remark-
able effect upon the overall competitiveness of a station's sound.
Section 1 of this manual provides a thorough discussion of system engineering con-
siderations, particularly with regard to minimizing overshoot and noise. Orban's
publication Maintaining Audio Quality in the Broadcast Facility (available for
download from www.orban.com
) provides many suggestions for maximizing source
quality
Bear in mind that the average AM receiver has an audio bandwidth of 2-3 kHz and
relatively high amounts of nonlinear distortion. 9400 processing is specifically de-
signed to make the best of this class of receiver Nevertheless, even at their best, such
radios can never yield truly high quality sound.
Further, almost all AM transmitters have a sound of their own. The very latest
transmitters (using digital modulation schemes) will create an on-air sound that is
audibly superior to transmitters of older design because the new transmitters have
dramatically lower nonlinear distortion. This improvement is not subtle and is read-
ily audible even on average consumer radios.
Security Passcode Lost (When Unit is Locked Out)
Please see If Y
ou Have Forgotten Your Passcode on page 2-45.
Connection Issues between the 9400 and a PC, Modem, or Net-
work
Presets: The more user presets you make, the more slowly the 9400 will respond
to front-panel commands. Delete any user presets you do not need.
Quick Setup: On the Station ID screen (Quick Setup 9): Use Escape in place of
Cancel. The Cancel button will not work.
Software Updates: Close any running Windows programs before attempting
to update.
Interrupted Software Updates: If you canceled an update before it com-
pleted, wait at least one minute before attempting your next update.
Software Updates via Modem: If you are updating via the modem, do not
change the “connection type” parameter on the 9400 while the modem is con-
nected or attempting to connect.
Security Passcode: An A
LL SCREENS (administrator) security passcode is re-
quired for upgrading, regardless of whether you are using a Direct, Modem, or
Ethernet connection.