RXRL-NV/2 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 14
SECTION 2
ELECTRICAL DESCRIPTION
2.1 INTRODUCTION
This section describes, in detail, the operating theory of the
RXRL-NV/2.
To aid understanding, the unit has been subdivided into blocks, each of which
is fully described below.
A block diagram is shown in Fig.4.
2.2 POWER SUPPLY
This circuit consists of 1 board mounted on the right side of the chassis
base (7 Fig.3).
The supply is designed to accept line voltages of 100V, 120V, 220V and 240V
±10% (24Vdc optional) at a frequency of 50-60Hz.
The power supply generates the stabilized voltages required by the various
modules comprising the RXRL-NV/2.
After having undergone filtering for mains-borne interference, the supply is
transformed to lower voltages, rectified, smoothed and stabilized for the
following outputs: +5V, +15V and -15V.
The +5V output supplies the CPU card and the PLL card, while the ±15V outputs
supply the CPU card, the Modmeter card, the Anameter cards 1 and 2, the Front-
end/Mixer, the Audio Process card, the 70MHz IF card, the PLL, the Muting card
and the Doubler.
All supply voltages may be monitored by the analog multimeter.
2.3 CPU
The CPU is housed in a metal box and mounted on the right side of the front
panel (4 Fig.3).
This circuit converts the number corresponding to the selected operating
frequency into binary code which is written to the programmable dividers of
the PLL.
This allows the VCO to lock to the desired operating frequency.
Several of the receiver’s parameters may be remotely controlled via an optional
9 pin D-type serial port.
In the absence of mains power, a non-volatile memory maintains indefinitely
the last frequency that was programmed.
2.4 MODMETER CARD
Summary of Contents for RXRL-NV/2
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