NEC PCN-1800 User Manual

P C N - 1 8 0 0 S e ri e s

V H F T V Tra n s m i t t e r

2nd Edition

T h e B e n c h m a r k i n A n a l o g T V B r o a d c a s t i n g

C o m p a c t d e s i g n a n d i n n o v a t i v e t e c h n o l o g y e s t a b l i s h N E C ’s n e w t r a n s m i t t e r a s t h e n ew b e n c h m a r k i n a n a l o g T V t r a n s m i t t e r s .

Proven results

NEC transmitters are renowned throughout the broadcast community for their superior reliability and minimal maintenance requirements. The new PCN series is the outcome of NEC’s vast experience in providing thousands of transmitters around the world, applying our sophisticated expertise in product design to set a new standard in ultra-compact VHF analog television transmitters. And now, by employing a new exciter, the PCN-1800 series enables easy conversion to digital TX.

PCN - 1800 Series Features

■ Easy conversion to digital TX

After a period of simultaneous analog-digital broadcasting, analog broadcasts will be discontinued. Analog TV transmitters will then be converted to digital and utilized as auxiliary transmitters or main transmitters in order to increase the number of MUXs (multiplexers) and utilize resources more effectively. With this in mind, NEC has come up with a new digitalized exciter that enables easy conversion from analog to digital through the replacement of software in our newest transmitter series.

■ All-band solution

Broadcasters are required to employ broadband-compatible transmitter units in situations that require channel change for common spare units or digital conversion. NEC’s PCN-1800 series provides an optimum solution for this requirement. Its exciter features direct modulation and a synthesizer, enabling the transmitter to be used for any VHF channel, simply by changing the frequency setting, and eliminating the need for BPF (Band Pass Filter) adjustment at the exciter stage. Its power amplifier (PA) incorporates a frequency table that automatically adjusts the gain and phase, providing an all-band solution and streamlining frequency adjustment.

■ Superior maintenance function

The automatic correction function in the exciter’s compensation circuit makes it extremely easy to perform characteristics adjustment as an automatic compensation, without having to use a demodulator. The color LCD panel enables easy monitoring of transmitter operation. The warning indication facilitates optimum troubleshooting before possible transmitter malfunction, enhancing availability.

■ User-friendly monitoring

The TX control unit features a built-in web server and SNMP. By connecting transmitters to a local area network, transmitters can be monitored and controlled from a remote PC with a web browser. Monitoring and control are also possible using the SNMP manager.

■ Sophisticated hybrid liquid cooling

NEC’s extensive liquid cooling experience has enabled us to design a simple but highly efficient cooling method that incorporates an automatic air-purge function and ensures easy water feeding.

The latest digital broadcasting technologies

■ Power Amplifier (PA) features

The PCN-1800 series power amplifier is a compact, highly efficient broadband solid-state amplifier which offers high linearity and incorporates circulators and a self-protection circuit for superior reliability. The PA features a built-in power supply that can be connected and removed, even during TX operation, to ensure prevention of leakage of liquids.

■ DM-3000B Analog Exciter features

The DM-3000B analog exciter is packed with state-of-the-art NEC technology. Integrating a broad range of functions into a single unit of greatly reduced size, this exciter can be easily upgraded from analog to digital TX system. A synthesizer tuned to all VHF band signals enables all-band direct conversion to an RF output. By employing an all-band synthesizer and direct conversion, any channel can be used simply by setting the compatible frequency. Furthermore, automatic compensation can be performed at the touch of a button, without having to use a demodulator.

■ Control and monitoring system

The control and monitoring system is composed of the TX control unit, an RF detector and a color LCD screen. To enhance transmitter availability, the system is divided into a unit that manages basic control and protection operations and a monitor. The monitor consists of an easy-to-view color LCD screen that enables effortless monitoring of transmitter operation and detects any possible malfunction at a glance.