R.V.R. Elettronica TEX20-NV, Technical Manual

Page: 43 / 110

TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 43
CALIBRATION PROCEDURE
5.1 MAIN CARD CALIBRATION
After having replaced the Main Card and relevant connectors, carry out the
following procedure (see SETUP5):
1) Connect a 50 Ohm, 20W dummy load to the RF output.
2) Connect an audio generator to the MONO input.
3) Turn INPUT LEVEL trimmer completely clockwise to obtain maximum
sensibility (0dBm). Select 98MHz frequency and switch on the equip-
ment.
4) Connect the FAM or other modulation analyzer to the -30dB tap
(7 Fig.2A and 2B).
5) Inject a 400Hz, 0dBm (775mVrms, 2.2Vpp) tone into the MONO input.
6) For EUROPA version, connect a coaxial cable to BNC connector with
inner connected to MONO(+) and the braided wire to MONO(-).
Now, turn R20 trimmer until the arrow is in the position showed in
Fig.4.
SETUP 5
SETUP 6