R.V.R. Elettronica PTRL-NV/2/S3, Technical Manual

Page: 10 / 162

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 10
PTRLNV/2/S3 and PTRL-NV/2/HP/S3 - Technical and Maintenance Manual
CHAPTER 1
GENERAL DESCRIPTION
1.1 MECHANICAL DESCRIPTION
The PTRL-NV/2/S3 (and PTRL-NV/2/HP/S3) is housed in a 3U, 19" rack-
mounting chassis comprising a number of interconnected modules mounted
internally on the base of the unit.
This allows easy removal and replacement of each module.
The power output control, audio output level control and meters for
various operating parameters are situated on the front panel.
Mains power and R.F. output connectors are mounted on the rear panel.
1.2 ELECTRICAL DESCRIPTION
The PTRL-NV/2/S3 (and PTRL-NV/2/HP/S3) is a hight quality,
broadband, FM Stereo transmitter with a standard output power of 1W or
2W (5W for the PTRL-NV/2/HP/S3).
The transmitter is microprocessor-controlled and synthesized with steps
of 100KHz in the 1400-2600 MHz band.
The operating frequency is governed by a thermally compensated reference
oscillator working within a phase locked loop (PLL).
The transmitter incorporates a stereo coder with an excellent stereo
separation and a low level of harmonic distorsion, and provides the input
for two SCA (RDS) signals.
A front switch allows operations in "STEREO" or "MONO/MPX"; in the latter,
the coder is excluded and the "RIGHT" input is used as a "MONO" input,
the "LEFT" input as a "WIDEBAND COMPOSITE INPUT". The low intermodulation
and distorsion values (typ. 0.03%) aand the high signal to noise ratio
(typ. 80 dB) are the main features of this coder.
The transmitter will attain frequency lock within a maximum of 30 seconds.
The operating bands is 50MHz depending upon the application.
The final stage is fully protected against any level of VSWR. Furthermore,
a 15 KHz low-pass filter is provided which may be inserted in the mono
or MPX input.
1.3 METERS AND INDICATORS
The transmitter's operating parameters can be measured with the
analog multimeter (17 Fig.1) and the led bar-graph display (3 Fig.1)
situated on the front panel.
The measurament being made by the analog multimeter is indicated by a
led indicator (14 Fig.1) and selectable via the corresponding control
(13 Fig.1).
Peak deviation can be measured with the bar-graph display (3 Fig.1) with
a resolution of 5%.
The five-figure display (12 Fig.1), mounted centrally, indicates the
operating frequency selected by the UP (11 Fig.1) and DOWN (8 Fig.1)