R.V.R. Elettronica RXRL-NV/2, Technical Manual

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RXRL-NV/2 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 27
red led, indicating 100% deviation (equivalent to 100 KHz).
With the DOT/BAR switch in the bar position, all the green leds and
first red led will be on.
Check that the audio analyzer reads +13dBm.
9) Connect an audio analyzer to the STEREO output (6 Fig.1).
Inject an externally generated carrier at the receiver’s operating
frequency, modulated by a 10KHz tone with ±100KHz deviation, into
the receiver’s R.F. input.
Check that, as for the MONO channel, the first red led switches on.
Check also that the level measured by the audio analyzer is 2.5dBm
for the version with 50µsec de-emphasis and -1dBm for the version
with 75µsec de-emphasis.
10) Inject a signal with a level of -83dBm and adjust the MUTING trimmer
R2 (15 Fig.1) until the red muting led switches on.
The audio signal will be automatically disabled and the Modmeter
bar-graph display will go out.
Using a pair of headphones, check that the audio has indeed been
disabled and that no signal remains audible.
If the audio level rises, the MUTING led will go out and reception
will continue as before.
11) The correct functioning of the STEREO PRES. led can only be verified
if the optional Stereo Decoder is fitted.
Similarly, the SCA PRES. led can only be checked if an optional SCA
decoder is fitted and a SCA signal is being received.
TABLE C
RECOMMENDED TEST EQUIPMENT