R.V.R. Elettronica RXRL-NV, Technical Manual

Page: 39 / 204

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 39
15) If the Stereo Decoder has an OVER RANGE indicator, adjust the
stereo
output level until the indicator just switches off.
16) Inject a carrier at the receiver’s operating frequency, modulated
by a 10 KHz tone with a deviation of ±75 KHz.
17) Check that the stereo separation reading is around 40-45 dB for both
channels.
If this is not the case, adjust R80 and R65 ensuring that the stereo
separation is balanced for both channels (±2 or 3 dB between L/R
and R/L).
18) Inject a carrier at the receiver’s operating frequency, modulated
by a 400 Hz tone with a deviation of ±75 KHz.
19) If necessary, adjust R71 to improve the stereo separation, using
the procedure described in step 16.
5.6 CALIBRATION OF THE CPU
After replacement, check that the displays function and that
operating frequencies can be programmed using the UP (14 Fig.1), DOWN
(12 Fig.1) and ENTER (13 Fig.1) buttons.
Check correct operation of the RS232 serial port (if fitted).
No other checks are required.
5.7 CALIBRATION OF THE ANAMETER CARD
For each of the selector positions adjust the corresponding trimmer
for the values listed below:
READING VALUE FSD TRIMMER NOTE
+15V 15V 30V R18
+5V 5V 30V R17
EXT 24V (OPT) 24V 30V R22
SIGNAL 1mV 1mV R21
CENTER BLACK MARK R16 1
SCA R15 2
MONO R19 3
MPX R20 4
NOTE:
1) The reading is valid at the half-way point on the horizontal black
mark on the meter scale.
2) If the receiver does not have a dedicated SCA output, it is not
possible to measure the SCA level on the Modmeter.
If present however, inject a 67-70 KHz signal with a deviation of
7.5 KHz, select SCA measurement with the front panel selector and
select x10 with the Modmeter selector.