ABEs PM"" Series Links operate in all the Microwave frequency bands commonly used for STL, Outside Broadcast and Communication purposes.
These have been designed for the transmission of high quality TV, Audio and Data signals using FM (with analogue or digital baseband inputs) or digital QPSK-QAM modulation.
In standard production are models operating in the 2GHz, 3-4GHz, 7-8GHz, 10GHz, 14GHz and 20-24GHz bands for other bands, please consult ABEs Sales Office.
The ""PM"" Links are now available in the following choices of configurations:
Fixed indoor version - housed in standard 19"" 3U rack drawers, comprising IF 70MHz Modulator, Microwave Transmitter, Microwave Receiver, IF 70MHz Demodulator
Outdoor version with Modulator and Demodulator in standard 19"" 3U rack mounting chassis and RF Heads for Transmitter and Receiver in outdoor sealed units, fitted on tripods or to be mounted near the antennas and on the same structure.
Digital IF 70MHz Modulators and Demodulators versions can also incorporate MPEG-2 Encoders and Decoders.
ABEs PM Series Links feature both double and single frequency conversion. The latter is used mainly in fixed frequency applications, with 70MHz intermediate frequency. Double conversion is used in tunable synthesised transmitters and receivers to provide channel selection on pre-programmed frequencies.
The analogue modulator and demodulator are designed with sufficient bandwidth capability to handle a single video channel with up to four audio, data or service channels.
Now the microwave links in the ""PM"" series are supplied without amplitude limiters and with high stability / low phase noise local oscillators, so to be ""Digital Ready"" also when supplied with analogue modulators and demodulators. These links can be later upgraded with digital QPSK / QAM modems, thus enabling future proof investment to satisfy both todays and tomorrows needs.
Digital operation (especially with the very robust QPSK modulation scheme) offers many notable advantages:
A single Link may be used to carry 4 (or more) video/audio programme channels in the same occupied bandwidth of a single programme analogue Link alternatively, a single video/dual audio digital link, occupies a fraction of the standard analogue bandwidth.
Link performance does not degrade progressively as the receiver input reduces but remains constant down to a very low threshold, generally around -90dbm.
In practice - and really remarkable - the receiver input range is increased by around 20dB, allowing the Link to maintain high performance with increased fade-margin, or to use lower RF power or smaller antenna sizes to cover the same distance.
At Microwave Repeating Stations, the ""PM"" series links may be used as non-demodulating IF repeaters or alternatively as receiver-transmitters with baseband interface, according to user requirements.
Links in the ""PM"" series have been manufactured since 1982 and over 5000 systems have been supplied. The equipment complies with most international and national technical specifi cations.
Options and accessories available with the ""PM"" series Links include Parabolic antennas, Multiplexers, Tripods for mobile use, Telemetry interface (for detailed description see Network Manager documentation), cables, connectors, waveguides, flanges, etc.
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These have been designed for the transmission of high quality TV, Audio and Data signals using FM (with analogue or digital baseband inputs) or digital QPSK-QAM modulation.
In standard production are models operating in the 2GHz, 3-4GHz, 7-8GHz, 10GHz, 14GHz and 20-24GHz bands for other bands, please consult ABEs Sales Office.
The ""PM"" Links are now available in the following choices of configurations:
Fixed indoor version - housed in standard 19"" 3U rack drawers, comprising IF 70MHz Modulator, Microwave Transmitter, Microwave Receiver, IF 70MHz Demodulator
Outdoor version with Modulator and Demodulator in standard 19"" 3U rack mounting chassis and RF Heads for Transmitter and Receiver in outdoor sealed units, fitted on tripods or to be mounted near the antennas and on the same structure.
Digital IF 70MHz Modulators and Demodulators versions can also incorporate MPEG-2 Encoders and Decoders.
ABEs PM Series Links feature both double and single frequency conversion. The latter is used mainly in fixed frequency applications, with 70MHz intermediate frequency. Double conversion is used in tunable synthesised transmitters and receivers to provide channel selection on pre-programmed frequencies.
The analogue modulator and demodulator are designed with sufficient bandwidth capability to handle a single video channel with up to four audio, data or service channels.
Now the microwave links in the ""PM"" series are supplied without amplitude limiters and with high stability / low phase noise local oscillators, so to be ""Digital Ready"" also when supplied with analogue modulators and demodulators. These links can be later upgraded with digital QPSK / QAM modems, thus enabling future proof investment to satisfy both todays and tomorrows needs.
Digital operation (especially with the very robust QPSK modulation scheme) offers many notable advantages:
A single Link may be used to carry 4 (or more) video/audio programme channels in the same occupied bandwidth of a single programme analogue Link alternatively, a single video/dual audio digital link, occupies a fraction of the standard analogue bandwidth.
Link performance does not degrade progressively as the receiver input reduces but remains constant down to a very low threshold, generally around -90dbm.
In practice - and really remarkable - the receiver input range is increased by around 20dB, allowing the Link to maintain high performance with increased fade-margin, or to use lower RF power or smaller antenna sizes to cover the same distance.
At Microwave Repeating Stations, the ""PM"" series links may be used as non-demodulating IF repeaters or alternatively as receiver-transmitters with baseband interface, according to user requirements.
Links in the ""PM"" series have been manufactured since 1982 and over 5000 systems have been supplied. The equipment complies with most international and national technical specifi cations.
Options and accessories available with the ""PM"" series Links include Parabolic antennas, Multiplexers, Tripods for mobile use, Telemetry interface (for detailed description see Network Manager documentation), cables, connectors, waveguides, flanges, etc.
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