Lectrosonics DSR4 - Technical Description; Compatibility Modes

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Technical
Description
The DSR4 digital 4-channel re-
ceiver is a versatile slot receiver,
equally appropriate for bag use,
as well as reality TV and run and
gun applications.
Extremely high Third Order In-
tercept (IP3) performance of +15
dBm, 24-bit/48 kHz audio perfor-
mance, and AES-256 CTR mode
encryption ensure that profession-
als in all audio disciplines have
the tools needed to get the job
done, even in extremely tough
environments.
Compatibility Modes
The DSR4 receiver was designed
to operate with Lectrosonics
digital transmitters from the D2,
DCH and M2 series. The receiver
is also backward compatible with
Digital Hybrid Wireless® trans-
mitters including those with NA
Hybrid, NU Hybrid, JA HYBRID
and EU Hybrid modes.
Encryption
The DSR4 receiver features AES
256-bit, CTR mode encryption,
with 4 dierent key policies avail-
able.
Diversity Options
The DSR4 oers two diversity
options: for 4-channel operation,
each channel combines signals
from both antennas in or out
of phase, depending on eld
strength at each antenna and
which combination yields the best
results. For 2-channel opera-
tion, receivers can be paired for
Vector Diversity operation. The
Vector subsystem smoothly and
continuously combines RF signals
from both channels, with dif-
fering phase angles in order to
obtain maximum energy. The four
receivers in the DSR4 can be use
separately or combined in pairs.
RF Frequency Tracking
Front-End
In addition to the extremely high
IP3 capability of the receiver, to
signicantly reduce unwanted
interference and intermodulation
problems, the DSR4 has a fre-
quency selective front-end section
that tracks and tunes to the de-
sired signal frequency and rejects
unwanted interfering signals. The
low noise, high current RF ampli-
er was designed with feedback
regulation for stability and precise
gain in order to handle stronger
RF signals without output over-
load. This produces a robust
front-end that is as selective as
xed single frequency designs
and is suitable for use in close
proximity to other receivers and
transmitters commonly used in
eld production bag systems.
Smart Noise Reduction
(SmartNR
™
)
The DSR4 has been meticulously
designed using the best avail-
able low noise components and
techniques. Nonetheless, the
wide dynamic range of digital and
Hybrid transmission technology,
combined with at response to
20 kHz, makes it possible to hear
the -120 dBV noise oor in the
transmitter’s mic preamp, or the
(usually) greater noise from the
lav microphone itself. (To put this