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RXRL-NV 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.
To aid understanding, the unit has been subdivided into blocks, each of
which is fully described below.
A block diagram is shown in fig. 3.
2.2 POWER SUPPLY
This circuit consists of 1 board mounted on the right side of the
chassis base (2 Photo1).
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.
After having undergone filtering for mains-borne interference, the
supply is transformed to lower voltages, rectified, smoothed and
stabilised for the following outputs: +5V, +15V and -15V.
The +5V output supplies the CPU card and the P.L.L. card, whilst 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.
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 Photo1).
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
indefinately the last frequency that was programmed.
2.4 MODMETER CARD
This card is mounted on the left side of the front panel (6 Photo1).
This circuit allows the deviation of the signal received by the Audio
Process card to be displayed by rectifying the audio signal.
The card has two BNC connectors; one for the mono signal and the other
Содержание RXRL-NV
Страница 20: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 20 FIG 1...
Страница 23: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 23 FIG 2...
Страница 25: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 25 PHOTO 1 9 8 7 1 2 3 4 10 6 11 5...
Страница 26: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 26 FIG 3...
Страница 66: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 66 FIG 1...
Страница 68: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 68 FIG 2...
Страница 70: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 70 FOTO 1 9 8 7 1 2 3 4 10 6 11 5...
Страница 71: ...RXRL NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 71 FIG 3...
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