Owner's manual

UHF Digital Hybrid Wireless
®
Rio Rancho, NM
5
General Technical Description
SmartDiversity
™
allowseachreceivertorunindepen-
dentlytoprovidetwoseparateaudiochannels.The
algorithmanalyzesboththeincomingRFlevelandthe
rateofchangeinRFleveltodeterminetheoptimum
timingforphaseswitching,andtheoptimumantenna
phase.Thesystemalsoemploys“opportunisticswitch-
ing”toanalyzeandthenlatchthephaseinthebest
positionduringbriefsquelchactivity.
Ratio Diversityblendstheaudiooutputsofbothreceiv-
ersinaseamlessmannertoproduceasingleaudio
output.Apanningcircuitblendsmoresignalfromthere-
ceiver with the stronger RF signal over a wide RF level
rangetoanticipateandeliminatedropoutslongbefore
theyoccur.WhenagoodRFsignalispresentatboth
receivers and the audio is blended equally, the signal to
noiseratioisincreasedby3dB.
Thedesignconsistsoftwoseparatereceiversbuiltinto
asingle,ultracompacthousingwithinterchangeable
adaptersforvideocamerawirelessreceiverslotsand
stand-aloneuse.DigitalHybridWireless
®
technology
providessuperb,compandor-freeaudioqualityand
compatibilitywithotherwirelesssystems.TheRFper-
formanceisextremelystableoveraverywidetempera-
turerange,makingthereceiverperfectlysuitedtothe
roughenvironmentalconditionsfoundineldproduc-
tion.
Thefrontpanelfeaturesamenu-drivenLCDinterface
and four membrane switches used to view and alter set-
tings.Audiooutputsareprovidedontherearpanelfor
camera slots or other audio devices, and in the case of
theSRa5P,onthefrontpanelthrougha5-pinTASeries
connector.
Abuilt-inspectrumanalyzerscansacrossthetuning
range of the receiver to locate RF signals in the vicinity
tosimplifyndingclearoperatingfrequencies.
RF PCB Block Diagram
Ref. Osc
SAW
filter
RF amp
Splitter
Phase
switch
Mixer
IF
amp
243.950 MHz
SAW
filter
SAW
filter
IF
amp
243.950 MHz
Rx IC
250 kHz
RSSI
Window
detect
Audio 1
Pulse
detector
1st
VCO
2nd
VCO
PLL
µP
SAW
filter
RF amp
Splitter
Phase
switch
Mixer
IF
amp
248.450 MHz
SAW
filter
SAW
filter
IF
amp
248.450 MHz
Rx IC
350 kHz
RSSI
Window
detect
Audio 2
Pulse
detector
1st
VCO
2nd
VCO
PLL
µP
Receiver 1
Receiver 2
High side
injection
High side
injection
244.200 MHz
248.800 MHz
SR Dual Receiver RF Board
Audio PCB Block Diagram
µP
DSP
Keypad
LCD
display
DAC
Codec
Memory
Ref xtal
Audio 1
Audio 2
(from RF PCB)
To both PLL
To phase switches
Audio amps
Digital pot
Digital pot
µP
digital
atten
CH 1
audio switch
CH 2
audio switch
Fuse
Camera
power in
Osc
sync
DC-DC
conv
DC-DC
conv
DC-DC
conv
On/O
–5V
+5V
Osc
sync
+1.6V
+3.3
V Reg
+3.3V
5k
5k
50
50
+
–
Com
Hi
Lo
+5V
+5V
5k
5k
50
50
+
–
Com
Hi
Lo
+5V
+5V
Diode
protected
outputs
1
2
3
4
5