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User Manual
Rev. 1.2- 24/01/11
PTX-DDS
4. General Description
The
PTX-DDS
is a FM digital exciter, DDS (Direct Digital Synthesizer), featuring
a 19” RACK-mountable form factor.
User interface consists of a graphic liquid crystal display and a knob (encoder).
This interface lets you view all parameters relating to machine operation and adjust
settable parameters (e.g.: power level or working frequency).
The exciter has been designed to easily integrate into complex transmission
systems. To this end, it is capable of accepting data from, controlling or interacting
with external equipments, such as amplifiers, switching units, relays or other
exciters.
The
PTX-DDS
design is based on a modular concept: the different functions
are performed by modules that are connected directly through male and female
connectors or through flat cables terminated by connectors. This design facilitates
maintenance and module replacement.
A LCD on the front panel and a control knob provide for user interfacing with the
microprocessor control system, which implements the following feature:
• Set up of the power output
• Set up of the working frequency
• Enabling or disabling of the power output delivery
• Measurement and visualization of the working parameters
• Communication with eternal devices
The management software offers an intuitive user interface and runs on any PC
in the WINDOWS™ environment.
On the rear panel is placed the audio section, which allows the interfacement with other
devices. From this section are available the analogic connectors for audio input (mono,
audio stereo, MPX), digital audio input (AES/EBU electrical and optical), 19kHz pilot tone
output and two SCA input for signals modulated on subcarriers from external coders,
it is normally uses in Europe for RDS transmission (Radio Data System).
The audio section includes functionality of RDS coder, externally programmable
through the proper RVR software.
There are also placed the mains power plug, RF output, RF test, the remote
connector and the protection fuse.
The equipment foresees several options on request, as GPS board function.
