Connecting And Disconnecting A Microphone Or Instrument; Sr 300 Stationary True Diversity Receiver; Standard Accessories; Optional Accessories - AKG HT 300 Mode D'emploi

19 - SENSITIVITY control
20 - Peak/battery status LED
21 - MIC audio input
22 - CH. carrier frequency selector
23 - Belt clip
24 - Carrier frequency table
25 - Frequency set designation
26 - Battery compartment door
5.3. Connecting and Disconnecting a Microphone or
Instrument
5.3.1. Lockable Mini Jack
To connect a microphone with threaded mini jack plug, plug the
microphone connector into the MIC jack (21) and screw the
connector CW all the way in. The connector will not make electri-
cal contact before it is screwed all the way in.
Condenser microphones require a power supply. To switch on
the microphone power supply integrated in the PT 300, set the
MIC/MUTE/LINE switch (16) to MIC.
When connecting a dynamic microphone or instrument
cable, set the MIC/MUTE/LINE switch (16) to LINE to
switch the condenser microphone power supply off.
To mute the audio input, set the MIC/MUTE/LINE switch (16) to MUTE.
To disconnect the microphone or instrument cable,
unscrew the mini jack plug on the microphone or instrument cable
and unplug it from the MIC jack (21).
5.3.2. Lockable Lemo or Fischer Socket
(Special version)
To connect a microphone with a lockable Lemo or Fischer plug, in-
sert the cable connector into the MIC jack (21) to the point that a
click indicates it is securely held in place. (It should not be possible
to unplug the connector by pulling at the cable.)
Condenser microphones require a power supply. To switch on
the microphone power supply integrated in the PT 300, set the
MIC/MUTE/LINE switch (16) to MIC.
When connecting a dynamic microphone or instrument
cable, set the MIC/MUTE/LINE switch (16) to LINE to
switch the condenser microphone power supply off.
To mute the audio input, set the MIC/MUTE/LINE switch (16) to
MUTE.
To disconnect the microphone, pull the end of the bushing away
from the case. This unlocks the connector and allows you to unplug
it.
6. SR 300 Stationary True Diversity
Receiver
The SR 300 is a stationary diversity receiver for use with all WMS
300 transmitters. The SR 300 operates within a cannel bandwidth
of up to 20 MHz in the high-band UHF range from 770 MHz to
950 MHz and lets you select one of 16 carrier frequencies within
the channel bandwidth.
12

6.1. Standard Accessories

11.7-V AC remote power supply
2 RA 300 UHF antennas

6.2. Optional Accessories

RA 300 B: Antenna with integrated booster
PS 300: UHF antenna splitter with 2 x 8 antenna outputs for SR
300 receivers
MK PS: Antenna splitter connecting cable
MK A10: 10-m (33-ft.) antenna cable
RMU 2: 19" rack mount mainframe for 2 SR 300s
RMU 2A: 19" rack mount mainframe for 2 SR 300s with front
panel antenna sockets, antenna splitter, and fixed
connecting cables
BP 1: Blank panel
CH 1: Carrying case

6.3. Controls

Refer to fig. 3:
27 - POWER on/off switch
28 - SQUELCH threshold control
29 - MUTE LED
30 - RF field strength meter
31 - AF audio level meter
32 - DIVERSITY LEDs A and B
33 - CHANNEL carrier frequency selector
34 - VOLUME output level control
35 - Frequency set designation
36 - Antenna socket
37 - Balanced audio output
38 - Unbalanced audio ouptut
39 - Power input
40 - Strain relief
41 - Carrier frequency table

6.4. Squelch

Each SR 300 receiver incorporates a squelch circuit that switches
the receiver off when the received signal is too weak, in order to
suppress the related noise or the residual noise of the receiver
while the transmitter is off. The SQUELCH control (28) adjusts the
squelch threshold from -95 dBm (MIN) to -80 dBm (MAX). The
MUTE LED (29) lights to indicate the audio output is muted.
It is good practice to keep the SQUELCH control (29) at MIN in or-
der to utilize the full reception sensitivity of the receiver.

6.5. True Diversity Reception

Reflections of metal parts, walls, ceiling, etc. may weaken the
transmitter signal to the point that the squelch will switch the recei-
ver off. This can be largely prevented by a technique called true
diversity reception. It uses two antennas each connected to its own
receiver circuit. A weighting circuit noiselessly switches the signal
with the better S/N ratio to the output. The SR 300 receiver
contains both the two independent RF sections and the weighting
circuit. The A and B LEDs (32) illuminate to indicate which RF
section is routed to the audio outputs (37), (38) at any time.
WMS 300