- Buyers Guide
The ALT series of LTTs are designed to replace the satellite link for test and alignment of earth station systems operating in S,C,X,Ku,Ka or DBS frequency bands. Incorporating fundamental frequency phase locked oscillators and double balanced mixers, the translators block convert frequencies from uplink to either downlink or L-band for instantaneous monitoring of frequency, power levels and modulation. The input path contains a front panel controlled continuously variable attenuator for reducing input power levels. Each unit also provides a reference frequency output and LO lock alarm.
A dedicated multiple Ku band unit has the ability to translate a common 13.75~14.50GHz uplink into four separate downlink bands of 10.70~11.45GHz, 10.95~11.70GHz, 11.45~12.2GHz and 12.0~12.75GHz enabling set-up to take place at most locations for the majority of the World’s Ku band broadcast and telecommunication satellite links.
Alternatively, mixed Ku and C band units are available for convenient alignment where both types of transponder are being addressed from co-located transmit / receive equipment.
Frequency conversion is achieved with custom double balanced mixer technology driven by crystal controlled phase locked oscillators.
Receives samples of the uplink frequencies anywhere in the range 27.5 to 31.0 GHz and converts that signal to the appropriate downlink frequency ranges occurring from 17.7 to 21.2 GHz.
Depending on the frequency regime of the individual system, there is a choice of internal local oscillator frequencies of either 9.8 GHz or 10.3 GHz with stability over +10 to +40C of +/-2ppm (options include TCXO and OCXO levels of stability) and typically each instrument has a 3 GHz bandwidth. Input signal level can be very easily adjusted over a 30dB range.
The local oscillator employs unique AtlanTecRF PLL technology and is locked to either its own internal reference or an externally provided source.
Wide range of options available for specific customer applications.
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