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{{Short description|Type of radio frequency converter}}
A '''test loop translator''' ('''TLT''') is a type of [[radio frequency]] converter or [[heterodyne]], used to translate between [[Telecommunications link|uplink and downlink]] segments (generally in the same band), to allow for "loop-back" testing and calibration of the [[ground station|ground segment]] without the need to interface with the [[satellite]].<ref name=novella>{{cite web|title=Test Loop Translator|website=http://www.novella.co.uk/test_loop_tech.htm|publisher=Novella Satcoms Ltd.|accessdate=23 February 2015}}</ref><ref name=atlantic>{{cite web|title=Model ASC 710C Test Loop Translator|url=http://atlanticsat.com/ASC710C.htm|publisher=Atlantic Satellite Corporation|accessdate=23 February 2015}}</ref> TLTs generally contain a fixed or preset [[local oscillator]] and a preset [[gain]], though the LO and gain may be adjustable in some models.<ref name=novella/> Most models have a negative gain (i.e., a loss), with -15 [[decibel|dB]] being the most common.<ref name=novella/>▼
[[File:Tampa Microwave Lab, Inc. LTT-03-1RU-107 Test Loop Translator.jpg|thumb|upright=1.6|Tampa Microwave Lab LTT-03-1RU-107 Test Loop Translator with adjustable output frequency and attenuation]]
▲A '''test loop translator''' ('''TLT''') is a type of [[radio frequency]] converter or [[heterodyne]], used to translate between [[Telecommunications link|uplink and downlink]] segments (generally in the same band), to allow for "loop-back" testing and calibration of
The test loop translator is an extremely valuable tool for evaluating the performance of satellite earth stations. It allows the user to carry out analysis, alignment and [[system testing]] without incurring satellite airtime costs and the risk of interfering with other satellite users. Thus, it has applications during equipment development, qualification, [[troubleshooting]] and in-service routine monitoring.<ref name="Loop Test Translators for Satcom Systems">{{cite web|title=Loop Test Translators for Satcom Systems|url=http://www.atlantecrf.com/pdf_downloads/MJ%20Article%20-%20Loop%20Test%20Translators.pdf|website=www.atlantecrf.com|publisher=AtlanTecRF|access-date=2015-07-31|archive-date=2016-03-05|archive-url=https://web.archive.org/web/20160305165745/http://www.atlantecrf.com/pdf_downloads/MJ%20Article%20-%20Loop%20Test%20Translators.pdf|url-status=dead}}</ref>
TLTs generally contain a fixed or preset [[local oscillator]] (LO) and a preset [[Gain (electronics)|gain]], though the LO and gain may be adjustable in some models.<ref name=novella/> Most models have a negative gain (i.e., signal attenuation), with -15 [[decibel|dB]] being the most common value.<ref name=novella/> Test loop translators can cover one or more of the satellite communication bands [[S band|S]], [[C band (IEEE)|C]], [[X band|X]], [[Ku band|K<sub>u</sub>]], [[Direct-broadcast satellite|DBS]], and [[Ka band|K<sub>a</sub>]].<ref name="S C X Ku DBS bands">{{cite web|title=Loop Test Translators|url=http://www.atlantecrf.com/products/satellite_communications_equipment/loop_test_translators/s_c_x_ku_dbs_bands.htm|website=www.atlantecrf.com|publisher=AtlanTecRF}}</ref><ref name="Ka Bands">{{cite web|title=Ka Band - Loop Test Translators|url=http://www.atlantecrf.com/products/satellite_communications_equipment/loop_test_translators/ka_bands.htm|website=www.atlantecrf.com|publisher=AtlanTecRF}}</ref>
==References==
{{reflist}}
[[Category:Frequency mixers]]▼
[[Category:Electronic test equipment]]
[[Category:Ground stations]]
{{radio-comm-stub}}
▲[[Category:Frequency mixers]]
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