R.V.R. Elettronica PTX30-UHT, Инструкция по установке, техническому обслуживанию и ремонту, Страница: 47 / 171

PTX30-UHT Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 47
5) Adjust the Input level trimmer (1 Fig.1A for Mono input or 3 Fig.1A
for Stereo input) completely clockwise for maximum level.
6) Adjust trimmer R30 on the Modmeter card so that the first red led
glows (the led coinciding with the 100% mark).
7) Set the 10%/100% switch (5 Fig.1A) to 10%.
8) Inject a 400Hz tone at a level of -20dBm.
9) Adjust trimmer R4 on the Modmeter card so that the first red led
glows (the led coinciding with the 10% mark).
5.4 MODMETER CARD CALIBRATION (U.S.A. VERSION)
After having replaced the amplifier, carry out the following
procedure (see SETUP8).
1) Connect a 50 Ohm, 30W (continuous) dummy load to the R.F. output
(10 Fig.2B).
2) Connect a low-distortion audio frequency generator to the MPX input
(12 Fig.2B).
3) Set the 10%/100% switch (1 Fig.1A) to 100%.
4) Inject a 400Hz tone at a level of 0dBm.
5) Adjust the Input level trimmer (11 Fig.2BA) completely clockwise
for maximum level.
6) Adjust trimmer R30 on the Modmeter card so that the first red led
glows (the led coinciding with the 100% mark).
7) Set the 10%/100% switch (1 Fig.1B) to 10%.
8) Inject a 400Hz tone at a level of -20dBm.
SETUP 8