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RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 15
for the stereo signal.
A switch allows the gain of the measuring circuit to be set to 10% or
100% for a more precise reading of low-level deviation (eg. SCA, RDS,
pilot tones).
Another switch sets the display mode to bar-graph or peak mode.
The display comprises 14 green leds and 6 red leds.
In the 100% display mode, each led represents 5KHz of deviation with the
first red led representing 75KHz and full scale at 100KHz.
In the 10% mode, each led represents 0.5KHz of deviation.
2.5 ANAMETER CARD
This circuit comprises two cards and a meter mounted centrally on
the front panel (5 Photo1).
This sub-assembly displays the values of various operating parameters
of the receiver: internal voltages and signal levels of MONO, MPX, STEREO,
SCA, CENTER (signal centering) and SIGNAL (signal amplitude).
The parameters are selected by a lever switch (20 Fig.1) and the selection
is indicated by the legend of the green led (8 Fig.1).
The readings are taken using the corresponding scale:
MEASUREMENT
SCALE
FDS
Internal voltages
V
30 V
Signal levels
V
1 mV
Three green leds indicate the presence of a STEREO signal, VCO lock and
the presence of a SCA signal (SCA PRES. and STEREO PRES. leds are working
only with the option decoder fitted).
2.6 FRONT-END MIXER
This card is enclosed in a metal container and mounted on the left
side of the rear panel (9 Photo1).
The RF input connector is part of this module.
The circuit receives the RF signal, amplifies it, and mixes it with the
signal generated by the VCO.
The difference signal obtained is supplied to the 70MHz IF card.
2.7 PLL
This card is mounted on the left side of the base of the unit
(9 Photo1).
The VCO is mounted on this card, enclosed in a metal container.
This circuit reads the binary equivalent of the frequency supplied by
the CPU. Its operation requires an external divider to process the
information received and sent on to the PLL.
The PLL compares the reference signal to the VCO signal and uses the
difference to lock the VCO to the operating frequency.
Содержание RXRL-NV
Страница 20: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 20 FIG 1...
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