SBS FM exciter FM250 is a highly advanced, fully featured broadcast FM exciter that is also ideally suited for use as a low power stand alone transmitter. Use of wideband design techniques means that frequency setting is easily achieved by internally set, direct reading dial switches, no further tuning is required.
The SBS FM exciter FM250 uses the sbs ultra linear modulator to give superb sound reproduction with freedom from overshoots and artefacts. SBS FM exciter FM250 will operate into any load without damage due to its VSWR cutback circuit that protects the power amplifier stage from adverse operating conditions. The PA Section in the FM250 uses sbs’ world renowned heat dissipating fresh-air-tunnel concept. The fan provides cooling to the specially designed heat sink with a stream of air that needs no filtering, saving on routine filter replacements.
The SBS FM exciter FM250 front panel metering shows forward and reflected power together with internal voltages, temperature and the modulation level. Quick view LED’s show advanced status information, including CPU ok, PLL Lock, external standard presence, mute, forward power alarm, receive carrier alarm (when used with rebroadcast option), modulation alarm and temperature. Also shown are the PA outputs including, forward, reverse, temperature and CPU status.
The addition of the unique modulation alarm, gives broadcasters alarm status outputs and indications that will show loss of audio or over modulation. A front panel monitor point for RF output is provided, as is a fully buffered baseband monitor for accurate monitoring of the modulator input.
The rear panel of the SBS FM exciter includes a remote control/monitoring socket that allows carrier muting and status signalling to an external system, additionally data sockets are provided for use with systems that have the ability to control exciters via RS232 or TCP/IP, these sockets are also used for programming advanced features within the FM250.
The SBS FM exciter FM250 is fully compatible with N+1 systems, with remote frequency selection being achieved by either RS232/TCPIP interface or rear panel logic selection of up to 6 preset frequencies. Conservatively rated components and a switch mode rectifier are used to ensure extremely high reliability and to give good efficiency.
A comprehensive range of input options is available. The SBS FM exciter FM250 has a multiplex/composite input, mono input and 3 SCA/RDS inputs. TheFM250/S includes a stereo limiter and stereo encoder, the AES/EBU input version allows for a stereo digital input and theFM250/RBRX includes a rebroadcast receiver for translator/rebroadcast