The BLT-5100-DBS from Atlantic Microwave is a Test Loop Translator with Downlink Frequency 12200 to 12700 MHz, Uplink Frequency 17300 to 17800 MHz, LO Frequency 5100 MHz, Attenuation Adjustment Range 30 dB. Tags: Single Band. More details for BLT-5100-DBS can be seen below.