BW Broadcast TX1000, Technical Manual

Page: 21 / 56

BW Broadcast technical manual
Page 21
Installation and setup
DIP switches 4-8: Factory Presets
DSW4 - 8 off Preset Bypass
All presets bypassed. For use with an external processor.
DSW4 AC (Factory Default)
A nice balance for lighter formats where loudness is not everything. A good all-rounder and ideal starting
point.
DSW5 HOT
Nice balance of bass and treble give the preset punch without sacrificing clarity.
DSW5 LOUD
A more competitive preset for crowded markets where loudness is important.
DSW5 SMOOTH
Controlled bass and highs with this preset will make your sound roll. Suits a variety of formats
DSW7 TALK
Higher gating thresholds and slower decays help to prevent ambience noise swelling. Perfect for talk format
stations.
It’s important to listen to and compare the options while passing a representative selection of typical pro-
gramme material through the board. This will help you establish which sound you prefer.
Jumper 6:
Pilot On/Off (stereo)
The default position is STEREO, pilot tone on.
This option allows you to remove or restore the stereo pilot tone, at a frequency of 19 kHz, normally sitting at
a level between 8 and 10% of total deviation.
It is this tone which alerts stereo FM receivers to the need to switch on their stereo decoders. The presence
of a pilot tone is all that is required for the ‘stereo’ beacon to light on a receiver. If no 19kHz tone is received,
the receiver will operate in mono. It will not decode any L-R information modulated on the 38 kHz subcarrier,
even when it is still present.
To make sure that no 38 kHz energy is generated during mono operation even from stereo inputs, set DIP
switch 3 to mono. This jumper does not affect the mono/stereo status of externally-coded MPX inputs.
Modes of operation
Multiplex / broadband input.
The Internal stereo encoder and audio limiter are not used. Wideband modulation is fed into the rear panel
BNC multiplex input socket. Allows external processors, encoders and rebroadcast receivers to be plugged
straight into the transmitter.
JUMPERS. J5 (OFF), J6 (NA), DSW1-8 (NA)
Stereo with no processing presets.
Left and Right audio are fed to the back panel balanced inputs and are pre-emphasized, peak limited, fil-
tered and then fed to the internal stereo encoder for multiplex generation. This mode can be used when
you are using an external processor to provide the correct sound. The multiplex signal is then fed through
to the exciter module and to the back panel multiplex output BNC socket. See loopthrough mode below *
JUMPERS. J5 (ON), J6 (STEREO), DSW1 (ON / OFF), DSW2 (50 / 75), DSW3 (STEREO), DSW4-8 (OFF)