- EBV infects B cells by binding to CR2 (CD21), a component of the B-cell co-receptor complex. The infection causes most of the infected cells to proliferate and produce virus, leading in turn to the proliferation of antigen -specific T cells and the excess of mononuclear white cells in the blood that gives the disease its name.
- EF50mm f/1.0L USM EF300mm f/2.8L USM EF600mm f/4L USM EF85mm f/1.2L USM EF400mm f/2.8L USM EF1200mm f/5.6L USM. Page 120 3 Customizing AF FunctionsN AF-assist beam firing Enables or disables the AF-assist beam from the built-in flash or EOS- dedicated external Speedlite. ON: Enable The AF-assist beam is emitted when necessary.
- Academia.edu is a platform for academics to share research papers.
- IDM H&S committee meetings for 2021 will be held via Microsoft Teams on the following Tuesdays at 12h00-13h00: 2 March 2021; 1 June 2021; 31 August 2021.
TO 31R2-2GRC171-2
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NAVELEX0967-LP-544-5010
current is supplied to transistor Q3 throughresistors R27
andR29.Thisforwardbiases Q3 causing it to turn on
amperes. The controlcircuitsprocess rf attenuation
(AGC)voltageandkey-linevoltage to control dc current
(about+25 V dc)developed by voltagedivideraction of
R29,R27,andthebasecircuit of Q3 reversebiases
diodeCR8.Thisenablesshuntdiodecontrolamplifier
4-227.
diode CR3 andreceiveseriesdiode CR2 respectively.
The positivevoltagedeveloped by voltagedivideraction
of R29,R27,andthebasecircuit of Q3 is alsoapplied
throughresistor R15 to thecathode of transmitseries
diodeCR1.Thisreversebiases CR1 andcauses it to
providemaximumattenuation to the rf signalbetween
thetransmitterandantennaports of thetransmit/receive
switch. Rf attenuation(AGC)voltagedeterminesthe rf
resistance of thereceiveseriesandreceiveshuntdiodes
which, in turn,determinesthe rf signalattenuation
betweenthereceiverandantennaports.
capacitorC7,andresistor R8 and to groundthrough
4-230. In receivemode, rf attenuationoccurs in stages.
U1A. The transmit-to-receiveandreceive-to-transmit
transferfunction of thetransmit/receiveswitch is
module A3 increases in a positivedirection as the rf
controlled by thecombinedcircuitaction of keyoffdelay
signalstrength at theantennaincreases.For rf signals
thatdevelop an rf attenuation(AGC)voltage of lessthan
2.5 V dc,thetransmit/receiveswitchprovidesminimum
4-228. The transferfunction of thetransmit/receive
switchoperates as follows. To switchfromreceive to
increasesabove2.5 V dc,seriesdiodecontrolamplifier
U1Bandreceiveattenuator Q4 begin to reducethe
transistor Q1 offwhich, in turn,turnstransmitenable
currentflowthroughreceiveseriesdiode CR2 to series
attenuatethereceive rf signal. At an rf attenuation
(AGC)voltage of approximately4.8 V dc, CR2 reaches
maximumsignalattenuation.Above4.8 V dc,shunt
CR1 (minimum rf resistance)andcausesthe rf signal to
be shunted to groundthroughcapacitorsC7-C2-C16and
C8.Transistor Q2 alsoshunts to groundbasedrive to
transistor Q3 causing Q3 to turnoff.Thisopensthe dc
currentpaththroughreceiveattenuator Q4 andallows a
4-231. The followingdescribescircuitaction of shunt
diodecontrolamplifierU1A,seriesdiodecontrolamplifier
resistor R14 by voltagedivideraction of resistor R28 and
R14.Thisvoltage,whenappliedthroughchoke L4 to the
(AGC)voltagevariesfrom2.5 to 8 V dc (activerange of
rf attenuation).Positive5.1-V dc powersupplyvoltage
suppliedthroughresistor R5 to thenoninvertinginput of
U1Abiasestheoutput of U1A at about 7 V dc when AGC
voltageappliedthroughresistor R4 to itsinvertinginput
antennaports of thetransmit/receiveswitch.Forward-
biasedtransmitseriesdiode CR1 providesminimum
At 2.5-V dc AGC voltage,theoutput of U1Adecreases to
attenuation to the rf signalbetweenthepoweramplifier
about+5.6 V dc which is stillsufficient to reversebias
CR3 (minimumshunt rf atten-uation).Seriesdiode
controlamplifierU1Breceivesthe+2.5-V dc voltage at
itsinvertinginputthroughresistorR9. The voltage at its
logic 1 key 1 voltageturnstransistor Q1 on which, in
noninvertinginput(slightlygreaterthan+2.5 V dc) is a
turn,turnstransmitenableswitch Q2 off.ResistorsR16,
function of thecurrentflowthrough CR2 andthevoltage
dropacrossthecurrentshapingnetwork(R1,R2,R3,
microseconddelay to theturn-ontime of Q1.Thisdelay
Transmit 5 5 1 Cr2 Driveway
assuresthepoweramplifieroutputpowerlevelhas
droppedcompletely to zerobeforeseriestransmitdiode
Transmit 5 5 1 Cr2 Drive Driver
CR1 is biasedoff.
attenuation)
Transmit 5 5 1 Cr2 Driver
