ETS-Lindgren 4630 Refrad Reference Radiator (Archived) - Manual (Page 16)

Functional Description MODEL 4630 REFRAD REFERENCE RADIATOR
12 © EMC TEST SYSTEMS, L.P. – MARCH 2002
REV F – PN 399214
correction factors is the worst – case chamber factor. The mean
between the upper and lower envelope curve is the mean chamber
factor.
Chamber factors (in dB) are to be added to the field-strengths (in
dB
μV/m) measured in the camber in order to achieve open-site
equivalents (in dB
μV/m).
During operation with CalStan, the REFRAD, test receiver or
spectrum analyzer, and antenna positioning mast are remotely
controlled. The operator is guided through the procedure by
commands appearing on the screen.
FUNCTIONAL DESCRIPTION
COMB GENERATOR
Functional groups:
Remote control decoder
Crystal oscillator and divider
Switching power supply
Pulse generator
Matching network
The clock signal from the crystal oscillator is divided to the
selected pulse repetition rate. With this signal the pulse generator
produces nano-second pulses with a very high amplitude, requiring
a voltage of 70 V generatored by the switching power supply. A
resistive 50 Ohm matching network is provide between the pulse
generator and the output.
Due to the use of a regulated switching power supply, the output
amplitude is stable for a 4.4 to 6 V power supply range.
REMOTE CONTROL UNIT
Functional groups:
GPIB – bus decoder
Remote control signal encoder
Selection and display unit
Archived 3/18/10