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

Page: 39 / 204

RXRL-NV/2 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 39
Adjust trimmer R28, situated on the Audio Process card, to obtain
a reading of 0 dBm. Adjust R15 so that the first red led of the
bar-graph display switches on.
3) Configure the unit as detailed in SETUP8 (Fig.12).
Put the bar-graph display selector in position x1 and inject a
carrier at the receiver’s operating frequency modulated by a 400Hz
tone with a deviation of ±100 KHz.
Check that the first red led switches on and if not, adjust R19
accordingly.
4) Repeat the procedure detailed in note 3 to measure the MPX signal.
Carry out all the calibration procedures for the various parameters
and select a measurement other than SCA, MONO or MPX.
Select x10 on the Modmeter and inject a carrier at the receiver’s
operating frequency, modulated by a 400Hz tone with ±10KHz deviation
and re-check that the first red led of the bar-graph display is
switched on.
Adjust R4 if necessary.
5.9 CALIBRATION OF THE MODMETER CARD
For this procedure please refer to SETUP8 (Fig. 12).
1) Inject a carrier at the receiver’s operating frequency, modulated
by a 400Hz tone with 100KHz deviation.
2) Set the switch to the "x1" position.
3) Adjust trimmer R30, situated on the Modmeter card, so that the first
red led switches on (corresponding to the 100% mark).
4) Set the switch to the "x10" position.
5) Inject a carrier at the receiver’s operating frequency, modulated
by a 400Hz tone with ±10KHz deviation.
6) Adjust trimmer R4, situated on the Modmeter card, so that the first
SETUP 7 / FIG. 11
SETUP 8 / FIG. 12