UHF Television Transmitters
It was designed to take full advantage of the latest generation of high power Inductive Output Tubes (IOT) available from all major tube manufacturers, this product features plug-in technology and tube removal allowing easy exchange of IOT's using built in IOT hoist assembly, without circuit assembly disconnection.
The cabinet has a positive pressure cooling system that has minimized the number of rotating fans, using a single high reliability blower for improved system dependability. Packaged close to the IOT itself, located within the high volume cabinet cooling plenum, are the fully accessible "hot-swap" LDMOS driver amplifiers.
All IOT-related power supplies are linear, leading to high reliability. Application and removal of high voltage is controlled by a novel solid-state step start system which also provides rapid removal of AC to the HVPS in the event of crowbar conditions or HV faults. Both system and HPA controllers are Programmable Logic Controller (PLC) based. This equipment was chosen because of its proven track record in hostile industrial environments. The logic structure is in ladder form and consequently is easily understood.
Analog meters are used for a rapid indication of critical transmitter conditions. More in depth information is available via alpha/numeric menu driven displays. All adjustments and calibrations are carried out digitally via the controller front panel.
The exciter system supports all global standards, analog and digital. Digital signal processing is used to create and correct both analog and digital modulated spectrums. Full "wrap around" correction effectively eliminates the linear and non-linear distortion without operator intervention.
<%=company%>, 516 Township Line Rd., Blue Bell, PA 19422. Phone: 215-542-7000; Fax: 215-542-7631.