R.V.R. Elettronica VJ3000 User manual

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 51
VJ3000 - Technical and Maintenance Manual
1
2
3
4
6
5
FIG.10

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 52
VJ3000 - Technical and Maintenance Manual
2.................... Kapton capacitor (C19)
3.................... Input connector (P2)
4.................... Tuning motor Input (M2)
5.................... Tuning motor Grid (M1)
6.................... Circular connector 28-pin (J2)
7.................... Circular connector 28-pin (J1)
8.................... Filament transformer (T5)

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VJ3000 - Technical and Maintenance Manual
1
8 7
234
6
5
FIG.11

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VJ3000 - Technical and Maintenance Manual
R.F. CAVITY LEFT SIDE VIEW
(FIG.12A)
1.................... Tuning motor Input (M2)
2.................... Tuning motor Grid (M1)
3.................... Blower pressure switch (S3)
4.................... R.F. cavity output
5.................... Tuning motor Load (M3)
6.................... Rigid Line
7.................... Low pass output filter (LPF1)
8.................... Filament transformer (T5)

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 55
VJ3000 - Technical and Maintenance Manual
1
2 3
4
5
876
FIG.12A

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VJ3000 - Technical and Maintenance Manual
R.F. CAVITY TOP VIEW
(FIG.12B)
1.................... Thread bars
2.................... Tuning motor Anode (M4)
3.................... Kapton capacitor (C4)
4.................... Low pass output filter (LPF1)
5.................... R.F. output connector (P4)
6.................... Air-flow chimney
7.................... Stop switch of the anode tuning

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VJ3000 - Technical and Maintenance Manual
1
2 3
76 5
4
FIG.12B

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 58
VJ3000 - Technical and Maintenance Manual
FIRST TUBE INSTALLATION DIAGRAM (FIG.13)

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 59
VJ3000 - Technical and Maintenance Manual
SECOND TUBE INSTALLATION DIAGRAM (FIG.14)

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 60
VJ3000 - Technical and Maintenance Manual
SECTION 3
INSTALLATION
3.1 INTRODUCTION
This section contains the information necessary for the installation
and preliminary checks of the VJ3000 Triode amplifier.
3.2 UNPACKING
Remove the unit from its packing and, before anything else, ensure
that the unit has not suffered any damage during transit and that all
front panel controls are operational.
3.3 FITTING THE TUBE
To fit the tube, carry out the following procedure:
1) Connent the line power cables to the connector block situated low
down at the rear of the unit The supply voltage should be 380V (or
as requested), threephase plus neutral. Connect the unit to a good
earth. Connect a dummy load suitable power rating, or the antenna
itself, to the amplifier output.
2) Open the rear panel, undoing the fixing screws (Fig.13)
3) Remove the top panel of the rack together with the top of the aluminium
flue (with protective metal net)
4) Switch on the supply ensuring that the ST.BY/H.V. switch is in the
ST.BY. position.
5) Now enable the tuning bottons with the key switch and use the PLATE
key to raise the fingered panel to its upper limit. Now ensure that
power to the unit is disabled.
6) Now insert the tube wwith the silver-plated anode tube into the
fingered hole of the sliding panel.
The tube has two discs that should initially be held towards the
person fitting the tube. Once inserted into the fingers, the tube
should be rotated until the discs are parallel to the part of the
cavity that shows other two discs fixed on the cavity wall itself.
Now raise the tube to position A as shown in Fig.14 and keep it in
this position. Insert the valve tube, rotating it until the grid
ring mates perfectly with the ring of the socket. To ensure the
correct insertion of the valve tube, check that the grid
contact, that nearest the anode is completely inserted in the
fingers mounted on the socket panel (see Fig.14).

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 61
VJ3000 - Technical and Maintenance Manual
Touching the ceramic parts of the valve tube with bare hands will
leave traces of grease. Avoid if possible, if not, clean with
tryethylene or acetone.
7) Once the valve tube is fully inserted, rest the silver tube on the
valve tube (position B fig.14) checking that the disks D and DÆ are
in front of those fixed to the cavity and perfectly equidistant
from the base. It is essential to lock collar C to the tube using
a number 7 tubular key, so that it cannot come away from the tube.
This collar should be fixed as close to the end of the tube as possible
so that it makes use of the elasticity of the tube.
8) Check that these operations have been correctly carried out and
reassemble the flue and top cover before closing the panel.
3.4 STARTING THE UNIT
To start the VJ3000 amplifier, carry out the following procedure:
1) The unit is intended for 380 Vac (or 220 Vac), 3 phases plus neutral.
It is imperative that the neutral supply is connected to the connector
terminal marked N, while the order of connection of the other phases
is unimportant since the fan is single phase (in the case of a unit
with a threephase fan, ensure that the fan rotates in the correct
direction). Connect the driver to the corresponding auxiliary
terminals; ensure correct connection to avoid possible damage to the
tube and final stage. Enable the battery back-up by switching the
lever switch situated on the back panel of the protection section.
Having installed the tube according to the preceding instructions,
reconnet line power.
2) Carry out SETUP 1.
3) Set the exciter to minimum power output and set the ST.BY./H.V. switch
to ST.BY (4 Fig.6).
4) Set the driver ON-OFF switch to OFF. Enable the supply with the main
switch (1 Fig.6) and wait during the warm-up period (tables D); this
period is shown on the two left-hand digits of the display by holding
down the TIM/CICL button (12 Fig.5). The number displayed (2 Fig.5)
indicates the warm-up time. One of four periods may be selected
setting the jumpers on the protection card according to table D.
5) Set the ST.BY/H.V. switch to H.V. ON (4 Fig.6); the high voltage
supply will be enabled and the tube anode absorption will rise to
250 mA (quiescent bias current (6 Fig.3). If the anode current does
not correspond to this figure, re-check that the tube is correctly
fitted, taking care to follow the correct procedure and
remembering that high voltages may be present inside the unit,
even with it switched off.

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VJ3000 - Technical and Maintenance Manual
(N.B. Take great care not to break the interlock microswitches
which inhibit the unit).
6) Check, using a clamp ammeter (SETUP 2) that the filament current
is about 51.5 A.
7) Now, using a multimeter (2 Fig.3), check that the filament voltage
is 7.5V ±0.37V; and that VA is about 4800 V. Check the values in Table
E according to the type of tube being used.
8) Switch on the exciter and, when locked, increase the power output
to 20-25W.
9) Adjust the INPUT and GRID tuning controls (2 & 4 Fig. 4) to obtain
minimum SWR as read from the exciter PWR meter; the anode current
should increase simultaneously.
10) Adjust the PLATE control (5 Fig.4) to obtain minimum output power
and repeat with the LOAD control.
N.B. To preset the PLATE control use the table supplied with the
amplifier. This operation is performed measuring the length of the
threaded rods coming out of the chamber and adjusting them to the lengths
in Table F to correspond to the desired operating frequency (the
measurement should be made from the end of the front, right-hand rod).
Check that the threaded rods move towards the inside of the chamber
whenever the frequency moves towards 108 Mhz and that the rods move out
of the chamber when the frequency moves towards 88 Mhz.
11) Increase the driver power and re-adjust the PLATE and LOAD controls
(3 & 5 Fig.4) for maximum power. An output power of 500-600 W should
be obtainable using the PTX30-UHT exciter and the 3CX3000A triode.
12) Reduce exciter power to a minimum and connect the driver in series
with the exciter (eg. PJ250) (SETUP 3).
13) Increase exciter power once more and repeat the adjustments of PLATE
and LOAD for maximum output power, gradually increasing the input
power. Should the SWR on the VJ3000 input increase with power output,
re-adjust the INPUT and GRID controls to minimize the SWR.
14) Now adjust the driver level and the LOAD and PLATE controls for 3KW
of output power. For all other parameters, refer to the calibration
tables supplied with the unit. Note that the maximum permissible
values are:
IA = 1.3 A Ig = 400 mA

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 63
VJ3000 - Technical and Maintenance Manual
SETUP 1

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VJ3000 - Technical and Maintenance Manual
SETUP 2

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VJ3000 - Technical and Maintenance Manual
SETUP 3

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 66
VJ3000 - Technical and Maintenance Manual
TABLED
JP4 PIN DESCRIPTION
JP4 JP4A
---------------------------------------------- --------------
| o2 o4 o6 o8 o10 o12 o14 o16 o18 o20 o22| | o5 o3 o1 |
||||||||||||||||||
| o1 o3 o5 o7 o9 o11 o13 o15 o17 o19 o21| | o6 o4 o2 |
---------------------------------------------- --------------
PIN NUMBER DISCRIPTION
1-2 RISERVATO
3-4 RISERVATO
5-6 MAX - 8
7-8 MAX - 4
9-10 MAX - 2
11-12 MAX - 1
13-14 TEMPO HT A
15-16 TEMPO HT B
17-18 HT x 0,4s
19-20 HT x 0,8s
21-22 TEST VELOCITA'
1-2 N.C. (TEST RES)
3-4 N.C. (TEST R MONO)
5-6 N.C. (TEST FILAMENTO)

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VJ3000 - Technical and Maintenance Manual
TABLEE
QUIESCENTPARAMETER
PARAMETER 3CX3000A
ANODE CURRENT 250mA
FILAMENT CURRENT 51.5 A
FILAMENT VOLTAGE 7.5 ±0.37V
GRID VOLTAGE Automatic polarization
ANODE VOLTAGE 4800 V

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VJ3000 - Technical and Maintenance Manual
For the real paramter refer to VJ3000 Test Check
TUNING TABLE (TABLE F)

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VJ3000 - Technical and Maintenance Manual
TABLEG
RECOMMENDED TEST EQUIPMENT
INSTRUMENT SUGGESTED MODEL SPECIFICATION
Non-Inductive Dummy Load Bird 50 Ohm P > 3 KW
Calibrated in-Line Bird Mod. 4715-200 50 Ohm
Wattmeter withSample
Power Supply HP6002A 0-50 V, 0-10 A

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VJ3000 - Technical and Maintenance Manual
PROTECTION TRIMMER TABLE (TABLE H)