dB PM 1000 - External Control and Measures; System Check Section

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL
17 /101
3.3 EXTERNAL CONTROL AND MEASURES
3.3.1 SYSTEM CHECK SECTION
See Fig. 1.1
On the front panel there is a section labelled “SYSTEM CHECK” which allows monitoring of all
the main functions and protections of the transmitter.
⇒ “ON” led: It shows the on/off state of the transmitter, thus the presence of a main power supply.
⇒ “OVERHEAT” led: It indicates that the overtemperature protection is on. This protection does
not need a RESET because it restores the normal working conditions automatically when the
temperature goes back to normal values.
⇒ “VSWR” led: It shows that the VSWR protection is active. This intelligent protection is
characterised by an automatic reset delayed by about 2-3 seconds to avoid the risk of accidental
intervention. This autoreset tries to resume to normal operation only 3-4 times, then turns off the
transmitter definitively.
⇒ “REMOTE SHUT-DOWN” led:
It is enable if the amplifier has the /R option.
When it is light on, shown that power output has zero worth because of a remote external
impulse.
⇒ “UNBAL” led:
It shows the unbalancing between the two AMP300 amplifier modules, thus an
equipment malfunction.