RXRL-NV/2 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 15
This card is mounted on the left side of the front panel (1 Fig.3). This
circuit allows the deviation of the signal received by the Audio Process card
(Mono, MPX or SCA).
The card has two BNC connectors; one for the mono signal and the other 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 6.66KHz of deviation with the
first red led representing 100KHz and FSD at 130KHz.
In the 10% mode, each led represents 0.66KHz of deviation.
2.5 ANAMETER CARD
This circuit comprises two cards and a meter mounted centrally on the front
panel (3 Fig.3).
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:
M E A S U R E M E N T
S C A L E
F D S
Internal voltages
V
30V
Signal levels
V
1mV
Three green leds indicate the presence of a STEREO signal, P.L.L. 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
These cards are housed in an aluminum billet (2 Fig.3) and are mounted
on the front part of the metal container enclosing the Audio Process and 70
MHz IF cards.
The Front-End section receives the RF signal from the RF cavity, filters and
amplifies it.
The Mixer section receives the RF signal from the Front-End circuit and mixes
it with the signal generated by the Doubler.
The difference signal obtained is supplied to the 70 MHz IF card.
2.7 CAVITY FILTER
This cavity filter (9 Fig.3) is screwed to cover of the metal container
Summary of Contents for RXRL-NV/2
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