Specifications

23
Control
room
switcher
Studio site
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
QSC
FE 5/1 hub
RAVE 188
Transmitter site
Air studio
Production studio
L
R
L
R
SCA audio
Transmitter
control
remote
Satellite
receiver
remote
control
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
QSC
FE 2/2 hub
RAVE 188
L
R
L
R
Audio from satellite downlink
Stereo
generator
FM exciter & transmitter
SCA gen.
Transmitter
remote
control &
metering
Satellite
receiver
controller
Satellite
receiver
To sat.
receiver
Audio
monitor point
RL
ENCODER
DECODER
DECODER
telemetering
L
R
Audio monitor
ENCODER
ENCODER
Transmitter
tele-
metering
DECODER
2 km of dual multi-mode optical fiber
spare optical fiber link
Optimod &
peak limiter
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At the transmitter site, a QSC FE 2/2 hub, which features two UTP and two fiber ports, will allow for a backup
fiber cable to be installed later.
Audio channel allocations
The table at left shows the allocation of the
RAVE network’s audio channels.
The optical fiber is jacketed for outdoor use
and will be strung on the utility poles that carry
the AC service up to the transmitter site.
Fortunately, fiber optic cabling is immune to
the hum fields around the AC wires. To be
relocated to the transmitter site is the stereo
generator, which will feed the FM exciter
directly. Also, the SCA generator will be
switched over from transmitter telemetering tones to a regular leased audio channel.
The present microwave STL has a THD spec of 0.7% at 100% modulation and an S/N ratio of 65 dB, so the superb
audio performance of the RAVE network eliminates one of the weaker links in the chain.
Although the transmitter site has an emergency generator that automatically starts up in event of an AC power
loss, the chief engineer plans to also use an off-the-shelf uninterruptible power supply. The UPS will power the
RAVE 188, hub, transmitter remote control, and satellite receiver so they are unaffected by the several seconds
of lag between the loss of AC power and when the generator is running and stable.
Using RAVE as a combined
multi-purpose STL and TSL