R.V.R. Electronica PTRL, Руководство пользователя

Страница: 14 / 48

PTRL & RXRL LCD
10 / 44 User Manual Rev. 1.2 - 31/01/05
5.2 Use
Switch on the transmitter by putting the selector on the position "I" (on) the switch
situated on the pannel, and switch it on thanks to the switch situated on the front
pannel.
Enter the menu "Set" and set the working frequency desired. For the description of
the different menus, read the chapter 5.4.
With the help of the switches and trimmers situated on the rear pannel, set the
characteristics (impedance, preenphasis, and possibly stereo/mono) and the levels
of the audio inputs and RDS (if used).
REMARK: When it comes out of the factory, the output power of the unit is regulated
at the minimum and is setted on the OFF position. Anyway we always advise to
check the setted level before you select the output power, especially when the unit is
used as modulator of a power amplifier.
From the predefined menu, set the desired power level.
From the menu "Fnc", set the power output.
5.3 Settings and calibration
The only regulations that should be done manually on the PTRL-LCD are the
regulations of the levels and audio functioning modes.
On the rear pannel of the unit there is a trimmer for each input of the exciter; the silk-
screnn of the pannel indicated to which input each trimmer refers to. The sensitivity
of the different inputs can be regulated with the trimmers as indicated in the following
tables:
• Sensitivity of the inputs
Input Chap. 7.2 Trimmer Sensitivity Notes
MPX/RDS [10] [11] -20 ÷ +13 dBm Input level for 2.0 kHz (-30 dB) of
deviation
SCA1 [9] [24] - 8 ÷ +13 dBm
SCA2 [22] [23] - 8 ÷ +13 dBm
Input level for 7.5 kHz (-20 dB) of
deviation
Left -
Mono/MPX
[26] [25] -13 ÷ +13 dBm
Right/Mono [13] [12] -13 ÷ +13 dBm
Input level for75 kHz(0 dB) of deviation
In order to regulate the sensitivity level of the inputs, it is important to keep in mind
that the instantaneous modulation level is indicated in the predefined menu and that
an indicator indicates that the level is at 75 kHz. For a correct regulation, we advise
to bring a signal equivalent to the signal level of your own audio programme into the
input of the unit and regulate the corresponding trimmer until the instantaneous
deviation coincides with the 75 kHz indication.