The TRE-17.55-12.45 from GeoSync Microwave is a Test Loop Translator with Downlink Frequency 12.2 to 12.7 GHz, Uplink Frequency 17.3 to 17.8 GHz, LO Frequency 5.1 GHz, Attenuation Adjustment Range 30 dB. Tags: Single Band. More details for TRE-17.55-12.45 can be seen below.