Coder - Decoder ADA102 (Balanced analog in/out) This is our antique website. For new equipment's please click the following link: The transport of audio signals at the last Century In the early days of radio, the use of audio over long distances was conducted by telephone lines. If radio stations were very important, they can afford to rent expensive hotlines, point to point.

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This lines had a reasonable response at low frequencies but poor at high. And in addition to cost a fortune. Small radio stations used standard public phone lines, although their poor audio quality.

The second method used then and still today, is radio wave link. These VHF/UHF links have coverage of about 60 km with a good frequency response. But their high distortion and noise means that radio links today are the worst part of the audio chain in a standard FM broadcasting. We could say that today the sound of an FM station is limited by the quality of the STL audio link. Finally, there are digital microwave links with prices of around U$ 15,000 dollars.

They have very good quality, but require special authorization to operate (not easy to get) and a high monthly cost fee for using a wide frequency band that this units need. Its coverage does not exceed 50 Km At the end of last century the extensive use of digital audio and Internet-based developments such as the transmission of data and audio over TCP/IP has changed the landscape completely. The intensive use of global optical fiber has replaced satellites for communications, making them faster and cheaper.

The transport of high-tech audio at the XXI Century The old submarine cables that were tended at 1880 were replaced by satellites after 1960 and now again, a century later, the man returned to the submarine cables. Today's fiber optics that handle high speed data.

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Internet is running worldwide using this technology. Gradually the transport of high-quality audio has turned to Internet. Even in the absence of broadband Internet providers in some locations, the digital link can be achieved using standard links at 5.8 GHz using WI FI or WI-Max with a range of 50 Km.

This units are low cost because standard mass production. And the 5,8 GHz microwave band is free of use The weakness of all these technologies is the PC computer. Its reliability is low, often entering virus or something is not working because the system 'crashes' After a power outage is not able to join to the network again. Its internal electrical environment is very noisy, deteriorating the quality of audio, which requires special audio cards that worth's more than the PC. And finally, its internal construction is far from having the reliability and construction quality of professional broadcast equipment. At this point Solidyne introduces their hardware based professional solution: The coder/decoder ADA102. ADA 102, a landmark in high quality Audio & Data link.

The ADA102 is a digital audio streaming generator, working stand alone. Encoder receives a stereo audio signal (analog or digital) turning it into a MP3 or PCM audio streaming, under different protocols (see specifications). The output coded TCP/IP is at a RJ45 connector, compatible with Ethernet networks, with direct connection to modem Through a front panel pushbutton, the ADA102 becomes Coder or Decoder. Some models need connection to PC to modify softw are. ADA102 at the same time manages Data signals using a RS-232 serial port. This allows to remote control from studios, the transmitter or the Digital audio processor.

Or you can send the RDS info to the RDS coder near the transmitter. Four lines allows remote controlling On-Off devices, 2 lines are with relay. Then is easy to switch On-Off transmitters, change antennas, etc If the Internet signal fails, ADA102 immediately starts to reproduce a special emergency audio program. This program is recorded at the radio station using a typical Pen Drive memory.

This program is able to last several hours. When Internet signal starts again, ADA102 stops the program ADA 102 Decoder, at the other end of the link, manages data stream coming through the Internet or by a microwave link 802.11.x, and convert it to audio signal. Audio is delivered analog balanced or digital stereo AES3, compatible with S/PDif.