Manual FCKL 1528 Page 13
7 Automatic scanning and recording with xy-recorder
A) One advantage of this receiver is the easy recording of interference spectrums, for
example with xy-recorders or storage oscilloscopes.
Usually the xy-recorder will be used. A look ahead if analysis (VARISCAN) adapts scan
speed to the spectrum to come. Highest scan speed is chosen for broad band
spectrums and slowest scan speed for narrow band signals.
VARISCAN is always active if automatic frequency scan is chosen. A cable connects
the xy-recorder to the rear side 25-pin sub-d- connector of the FCKL 1528. The
xy-recorder receives the analogue voltages for frequency and interference voltage.
There are 2 connectors for the frequency and 2 connectors for the y amplitude. A DIN-
connector is there for pen lift control.
B) The connectors of the cable have writings. The black connectors belong to the sockets
of the xy-recorder indicated with a minus. The x socket (frequency) of the recorder
belongs to the red connector, the y-connector (amplitude) belongs to the yellow
(voltage, dB).
The 3 pin DIN connector is responsible for pen up / pen down control. This DIN
connector fits directly into xy-recorder delivered by our company. On the control panel
of the xy-recorder both sensitivity switches are positioned to 0,1V/cm and the other
switches to "Var." (=variable sensitivity).
By toggling the rotary switch (5.4) between the 2 edge positions, the receiver toggles
between 9 kHz and 29.999 MHz and the pen of the xy-recorder toggles between left
and right edge.
Now one of the prefabricated diagrams is positioned on the xy-recorder and
electrostatically fixed (switch "chart "). Position the receiver with (5.4) to 9 kHz (F
L
). The
pen is adjusted by the x zeroing control (hor. double arrow) to the 9 kHz frequency line.
Set (5.4) to 29.999 MHz (F
H
). The pen runs to the 30 MHz line. Adjust the pen to this
line precisely by controlling the "Var."-control (=sensitivity). Adjustment of the dB
scaling is similar. Without input signal (Low Noise position reduces base line noise) the
"y" zero is adjusted to the bottom line of the diagram. With permanent calibration signal
adjust "var."-control (=y - sensitivity) until the centre 0 dB(rel.)-line is reached. Without
calibration signal for 9 kHz point A and for 30 MHz point B must be covered.
*
Switching should be made without stopping at Start to avoid starting the scan procedure.