Installation guide

Williams Sound
®
Helping People Hear
25
NOISE IN AUDIO “GROWS” WHEN PROGRAM IS SILENT
The Audio Level control is set too high. You’re probably also seeing the +6 level
indicator lighting all the time. To correct, adjust the Audio Level control.
It could be that the T4’s Audio Processor is set for Compress when Limit might be more
appropriate for the type of program being transmitted. Reset the Audio Select switch for
Limit. See page 15.
RECEPTION (AT RECEIVER) DIFFICULTIES
Check Audio Difficulties (as heard in phones jack on transmitter) before checking reception.
NO RECEPTION
If the the T4’s RF Indicator LED is not on, it’s possible that an invalid channel is set on
the FM Channel/FM Power Switch. Reset this switch to a valid channel.
Check to see if the antenna has been disconnected. If so, attach the antenna correctly.
Check to see if the output power is set to “OFF”. If so, reset the FM Channel/FM Power
Switch for FULL, HALF, or QUARTER RF output.
INSUFFICIENT RANGE, GOOD RECEPTION NEAR TRANSMITTER, POOR AT A DISTANCE
Check to see if the transmitting antenna was installed incorrectly. If so, correct or replace
the antenna. The signal should be clearly audible at a 300 foot distance with the
ANT 021 and a 500 foot distance with the ANT 005.
Make sure the transmitting antenna is not in an unsuitable location.
Perhaps the transmitting antenna was installed inside a metal enclosure or is separated
from the reception area by electrically conducting objects. (i.e., steel stud walls, heating
ducts, substantial structural steel, or 2x2 or 2x4 ceiling grid.) In either case, reinstall the
antenna according to installation instructions, locating it outside metal enclosures and
away from electrically conducting objects.
Perhaps there is a strong interfering signal. If so, make sure the transmitter and antenna
are correctly installed. Set the transmitter to FULL power output. If this does not solve
the problem, change the PPA 250’s frequency by setting the FM Channel/FM Power
Switch according to the instructions on page 24.0
DROPOUTS: AREAS OF NO RECEPTION WITHIN NORMAL RECEPTION AREA
If dropout areas are few and less than 2 feet across, there is no problem. This is part of
normal operation.
If dropouts are many and large, see the section on insufficient range above.
POPS OR SIMILAR LARGE DEFECTS IN RECEIVED AUDIO
Check to see if there is defective audio at the transmitter. If so, See the Audio Difficulties
section.
Check to see if the receivers are incorrectly tuned. If so, adjust receiver according to
instructions on page 20.