R.V.R. Elettronica HC2 LCD, Руководство пользователя

Страница: 33 / 34

HC2
29 / 30 User Manual Rev. 1.1L - 07/07/03
Figure 4
8) Repeat steps 6 and 7 until the transmitter’s power reaches a value that cannot
be further rised
9) Increase the exciter power and verify that the system can reach the station’s
nominal power
10) Switch off the transmitter
11) Put in place again the coupler’s upper cover
Notes:
• The described procedure is the one optimized to adjust the coupler to work on
a certain channel (frequency). When the coupler has to be adjusted on the
whole FM band, start executing the procedure at 98.0 MHz, and then repeat it
at 87.5 MHz and 108.0 MHz, until the best tradeoff is met.
•
If the adjustment is done because one of the amplifiers has been substituted,
it is normally sufficient to operate only on the capacitors related to the substituted
amplifier.
8.3.2 Capacitors accessible from the front panel
The procedure to be followed in this case is the same as the previous one, with
the following different points:
• It is not necessary to remove the cover of the coupler: the trimmer can be
directly operated from the front panel through the holes intended for the
ventilation air flow (figure 5)
3 1
4 2