3. Description of the barrier strip of the UV 300:
+24V
:
Operating v24V, general supply voltage
CN2-1
GND
:
Ground for the operating voltage
CN2-2
Rel.
:
Release (+24V causes offering of the AF signal to the PA system)
CN2-3
(If this input is to be attended by the control output pin 13 of the power
supplies DEM 201/202/206/207/209, the jumper J6 must be cut on PCB 80402
and changed by soldering; see also point 5).
Rem.on
:
Switched output for remote switching on of the PA system (as option)
CN2-4
NF+
:
AF output of the module (electron. bal., transformer as option)
CN2-5
NF-
:
AF output of the module (electron. bal., transformer as option)
CN2-6
GND
:
AF ground
CN2-7
CASC
:
Cascading input to couple of up to five UV300`s
CN2-8
(Is to be connected with the output of another module)
4. Operation of the UV 300
As soon as the system is switched on, the UV 300’s ON LED lights up and indicates that the module is ready for ope-
ration.
A microphone can be connected to the socket “microphone” and/or another sound source (tape deck, tuner ...) can be
connected to the socket tape/cd/dat.
The sound of the connected AF source can be changed via the according bass, treble and volume controls.
With the MODE switch in position “mute” no AF signal is passed on to the PA system.
In position “mix” the UV 300 works like a 2-channel mixer. The microphone and the line inputs can be adjusted by their
own volume control and altered in sound via the tone controls.
With the MODE switch in position “damping” the line signal is attenuated as soon as somebody speaks into the con-
nected microphone.
The damping control adjusts the depth of the line signal attenuation (control range: -6dB ... -20 dB).
The sensitivity is designed for standard dynamic microphones. If a sensitive microphone (condensor microphone, mic-
rophone with preamplifier ...) is used, the threshold of the “damping circuit” can be adjusted via trimmer VR9.
(Turning trimmer clockwise, seen from the soldering side, means reducing the threshold sensitivity).
The damping function is not affected by the volume control of the microphone input and therefore cannot be reduced
or switched off by turning the control counterclockwise. If the microphone is too sensitive or is located too close to the
loudspeaker, a “pumping effect” or self-closing can result.
Remedy:
Use a microphone with an ON/OFF switch and switch off during speech breaks. See to it
that there is sufficient distance between microphone and loudspeaker in order to avoid
acoustic feedback.
NOTE!
If a phantom-powered condensor microphone is used, make sure it is suited for the phantom v18V
(see owner’s manual of the microphone).
