I0JXX Mast Mount Low Noise Preamplifiers offer high gain amplification with excellent noise figures in VHF and UHF amateur band optimized devices for casual operation or contest-grade directional antenna systems. Built for long-term tower top use, two high-power SPDT coaxial relays are used to protect the internal, band-specific I0JXX LNA using low-loss and high-isolation interconnections. These exceptional components are housed in a specialized weather and UV resistant black polyamide case with a drip edge surrounding two downward facing Type N female connectors mounted on a rugged, 12 gauge (2mm) aluminum panel. A separate female BNC is for the DC power and control voltage, intended to be sent from the required sequencer via an inexpensive coaxial cable.

Extraordinary receive-transmit-receive changeover performance of approximately 50ms is achieved by these compact 12VDC mast mounted units. Their internal LNA (low noise amplifiers) offer preamplification using ultra-low noise components which are as good or better than a typical receiver front end, to preserve the capabilities of a low-noise antenna or stacked array and the transceive system. The internal relays are connected to automatically bypass the internal preamplifier when power is removed. An I0JXX SEQJXXBOX Sequencer can be used to control I0JXX Mast Mount Low Noise Preamplifiers for two-way VHF or UHF communications, built with high quality components for many years of service.

Specifications of I0JXX Mast Mounted Low Noise Preamplifiers