The TRS-17.7-12.1 from GeoSync Microwave is a Test Loop Translator with Downlink Frequency 11.7 to 12.5 GHz, Uplink Frequency 17.3 to 18.1 GHz, LO Frequency 5.6 GHz, Attenuation Adjustment Range 30 dB. Tags: Single Band. More details for TRS-17.7-12.1 can be seen below.