3-8
Section 3: Installation
Moseley SL9003Q
602-12016-01 Revision J
•
Serial I/O Data
: RS232, 300-9600 bps (equivalent to the subcarrier data port that will
be used in the site installation - use the actual remote control equipment if possible)
•
Audio Distortion Analyzer
: AES/EBU digital audio I/O is desirable. (Test equipment
will allow adjustment of levels for calibration check.)
Procedure
1.
Connect the equipment as shown in Figure 3-3. Be sure to physically separate the TX
and RX units by greater than 15 feet.
2.
Ensure the link is RF operational as outlined in the RF Bench Test (Section 3.2.1).
Adjust the attenuator for an RSL reading of –60 dBm +/- 2 dBm and verify error-free
operation.
3.
Make sure the appropriate module ID# is selected in both the Transmitter and
Receiver Units (in the METER LCD screen).
4.
AES/EBU Digital Audio Test
: Apply a 1 kHz stereo tone at a level of 0 dB (full
scale), to the Source Encoder module.
5.
The front panel bar graph of the transmitter and the receiver should register a 0 dB
reading for both channels.
6.
Analog In/Out Audio Test
: Be sure there is no AES signal at the module in order
to force the auto-switching circuitry to the analog inputs. Next, apply a 1 kHz tone,
at a level of +10dBm, to the left (CH.1) channel.
7.
The front panel bar graph of the transmitter and the receiver should register a 0 dB
reading for Channel 1.
8.
Measure the audio frequency response:
32 kHz sample rate: 5 Hz-15 kHz +/- 0.2 dB
44.1 kHz sample rate: 5 Hz-20 kHz +/- 0.2 dB
48 kHz sample rate: 5 Hz-22.5 kHz +/- 0.2 dB
9.
Signal to Noise
: Measure the 1 kHz level and set a reference for an SNR
measurement.
10.
Disconnect or disable the tone at the encoder input and measure the SNR of the
system:
AES/EBU in/out: < -90 dB (-92 typ.) Linear/Compressed
ANALOG in/out: < -82 dB (-84 typ.) Linear/Compressed
11.
Reapply the 1 kHz tone and measure THD:
Linear, AES/EBU: <0.01% (.0025% typ.)
Linear, Analog: <0.01% (.008% typ.)
MPEG, AES/EBU: <0.01% (.003% @ 1kHz typ.)
MPEG, Analog: <0.015% (.012% @ 1kHz typ.)
NOTE
: The static distortion measurement of MPEG compressed audio is erroneous in
that the compression algorithm depends on dynamic audio level changes (i.e., music). The
subjective aural distortion is much lower. The static measurement is also dependent on
frequency (.007 % typ @ 7-12kHz). The above values are typical at 1kHz and will provide
excellent on-air performance.
3.3 Site Installation
The installation of the SL9003Q involves several considerations. A proper installation is
usually preceded by a pre-installation site survey of the facilities. The purpose of this survey
is to familiarize the customer with the basic requirements needed for the installation to go
Summary of Contents for Starlink SL9003Q
Page 86: ...5 22 Section 5 Module Configuration Moseley SL9003Q 602 12016 01 Revision J ...
Page 90: ...6 4 Section 6 Customer Service Moseley SL9003Q 602 12016 01 Revision J ...
Page 110: ...A 10 Appendix A Path Evaluation Information Moseley SL9003Q 602 12016 01 Revision J ...
Page 118: ...D 2 Appendix D Microvolt dBm Watt Conversion 50 ohms Moseley SL9003Q 602 12016 01 Revision J ...