R.V.R. Electronica VJ3000, Руководство по обслуживанию

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R.V.R. ELETTRONICA S.r.l. (BO) Pag. 14
VJ3000 - Technical and Maintenance Manual
SECTION 1
GENERAL DESCRIPTION OF THE
VJ3000
1.1 MECHANICAL DESCRIPTION
The VJ3000 is housed in a 19" rack cabinet, 24U high, of which 6 are
free and may be used to fit an exciter, a receiver and other equipment.
Four analog meters are situated on the front panel (Fig. 1A) together
with all the various controls and switches.
The rear panel (Fig. 1B) has no connectors but only the air inlet for
the cooling fan, complete with air-filter, and an opening for supply
cables and external drivers cables.
A flue is situated on the top of the rack (Fig. 1B) which allows hot air
to be expelled. The antenna connector is also situated here.
1.2 ELECTRICAL DESCRIPTION
The VJ3000 is a tube amplifier, using the grounded grid configuration,
operating in the 87.5-108Mhz.
This amplifier is able to generate an output power in excess of 3KW with
a driver power of about 150-200W.
The amplifier features motorised matching of the anode, load and input
circuits, allowing coverage of the entire frequency band.
The VJ3000 has been designed to use a Monophase supply (Threephase on
request).
1.3 INDICATORS AND CONTROLS
The front panel (Fig.1A) is subdivided into: meter panel, tuning
panel, alarm panel and high voltage panel.
Four analog meters are situated on the meter panel: the first is
multifunctional allowing measurement
on filament voltage, and measurement of the anode VA voltage; the second
measures the current consumed by grid; the third displays anode current;
the fourth measures direct or reflected antenna power selected by a
switch. The tuning panel (Fig. 4) contains 4 tuning switches and a key
switch to enable the tuning motors.
Of theese switches, one tunes the anode (PLATE), one matches the load
(LOAD) and two tune of the input circuit (INPUT and GRID).
On the high voltage panel (Fig. 6) a green indicator lights when the main
power
switch is switched on and a red indicator lights when the high voltage
supply is enabled.
In addition there are a ST.BY/H.V ON selector, an hour meter and the main
power switch.