R.V.R. Elettronica HC3, Manual

Page: 10 / 64

HC3 - Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 10
CHAPTER 1
GENERAL DESCRIPTION
1.1 EXTERNAL DESCRIPTION
The HC3 is housed in a 3U, 19" rack. On the front panel there are: four
alarms leds (3-7-8-9 Fig.1), the button for the Alarms Reset (4
Fig.1), two signalling leds (1-2 Fig.1) for A.C. line presence and external
Stand-By, the anlog meter (5 Fig.1) and the relative selector of the parameters
that can be measured (10 Fig.1). On the rear panel are mounted: the mains voltage
selector and A.C. Line inlet (1-2 Fig.2), the R.F. output connector to antenna
(14 Fig.2), the R.F. input connector from exciter (9 Fig.2), three R.F. output
connectors for the driving of the three amplifiers (10-11-12 Fig.2), three
R.F. input connectors from the the three amplifiers (16-17-18 Fig.2). There
are also present an auxiliary out A.C. Line socket and relative protection
fuse, one BNC Interlock connector (7 Fig.2), a D-type Telemetry connector (5
Fig.2), the R.F. Test Connector at -60 dB (15 Fig.2) and one BNC connector
correlated to unbalanced power signal for "Fold-Back" utility regarding the
exciter.
1.2 ELECTRICAL DESCRIPTION
The HC3 Hybrid Coupler, realized with "Suspended-Substrate-Strip-Lines"
technology, allows to combine on the antenna the outputs of three power
amplifiers (max. 1200 W) and to split their driver power coming from a single
exciter.
The exciter and the HC3 are connected in cascade through the Alarms/Interlock
connectors. This allows to shut down the exciter in the event of a fault on
either amplifiers the system.
The exciter's AGC connection, if connected to HC3 Fold Back signal, allows
the reduction of the unbalanced power transients and the absolute riduction
of the exciter power output for the best system working. In the event that
a failure occurs on two of the amplifiers and the user wishes to operate at
the best power out, the exciter must be disconnected from the coupler and
connected to the functionig amplifier that in the same way, must be connected
directly to the antenna. If this connection isn't made, on the coupler's output
can be obtained approximately an output power less of a 1/2 of the nominal
value for one amplifier out of game) or less of 1/6 for two amplifier out of
game, the lost power of the working amplifiers is dissipated as unbalanced
power on the 50Ohm power reistors to the absorption outputs.
1.3 METERS AND INDICATORS
The operating parameters can be measured with the analog multimeter (9
Fig.1) situated on the front panel. The measurament being made by the analog
multimeter selectable via the corresponding control (8 Fig.1).
Four alarm conditions leds provide indication of overtemperature (1
Fig.1), excess of V.S.W.R. (2 Fig.1), excess of unbalanced power (3 Fig.1)