Low noise figure coaxial preamplifier with SAW input filter. Can be powered directly from the TTGO module or SDR key (subject to minor modification). Perfect for amplifying the signals of radiosondes such as the Vaisala RS-41. You can also use it with the SDR key and the home antenna.
A 50 - 54 MHz ( 6 meter ) HF preamplifier with innovative design. Input notch filter for FM frequency 88- 108 MHz. Noise figure of 0,5db. Perfect for use satellite, EME, contest and dx. Anticorodal Aluminium cylindrical Design.