R.V.R. Elettronica TEX20-NV, Техническое руководство

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TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 10
CHAPTER 1
DESCRIPTION OF THE TEX20-
N.V.
1.1 GENERAL DESCRIPTION
The TEX20-N.V. is housed in a 2U, 19" rack-mounting container comprising
a number of interconnected modules mounted internally on the bottom of the
equipment, facilitating removal and substitution.
On the front panel there are: the power output control PWR ADJ, the PWR/DEV
selector to select the power or deviation measuring on the analog meter, the
switch on selector with its relative led and the analog meter for the measuring
of main operating parameters.
For EUROPA version there are two BNC connectors too, one for MONO input and
other for MPX input.
On the rear panel there are: the BNC connector for mains voltage input, the
R.F. TEST -30dB BNC connector, the INTERLOCK BNC connector to block R.F. power
output from external equipment, the R.F. Output N-type connector, and only
for USA version, a EXT. REF. 1KHz BNC connector and audio inputs BNC connectors.
1.2 ELECTRICAL DESCRIPTION
The TEX20-N.V. is an exciter working in the 87.5 to 108 MHz band,
programmable in steps of 10 KHz. Its power output is continuously adjustable
from 2 to 20W into a 50 Ohm load.
It also accepts three SCA signals through the connectors placed on the rear
panel (only for USA version).
The specification features low audio distortion and intermodulation figures
(typ. 0.05%) and a high signal-to-noise ratio (typ. -72 dB).
A voltage selector on the transformer primary allows a variety of supply
voltages to be used.
1.3 METERS AND INDICATORS
The operating parameters of the exciter can be monitored using the analog
multimeter (1 Fig.1A EUROPA ver. and 1 Fig.1B USA ver.) situated on the front
panel.
The parameter to be measured is selected by the selector
(10-11 Fig.1A and 3-5 Fig.1B).
The frequency control (8 Fig.1A and 6 Fig.1B) allows frequencies to be selected
in steps of 10 KHz.
Two red alarm leds indicate VCO unlock (12 Fig.1A and 7 Fig.1B) and the mains
voltage line presence (13 Fig.1A and 9 Fig.1B).
Three green leds indicate the presence of +12V, +15V and +20V (2 Fig.1A
and 1B) voltages which are used to power the various cards inside the exciter.
There are a trimmer (7 Fig.1A and 4 Fig.1B) too that allows to choose the level