The high-performance transverter TR144H with its outstanding specifications is the combined result of a circuit design using state-of-the-art components and of Kuhne Electronic's long experience in microwave transverters. The TR144H is specially designed for demanding VHF Amateur Radio applications like high performance contest stations, but can be modified for professional use in the 140 MHz frequency range . The receiver path is able to cope with very large interference levels from other transmitters, a situation common to contest sites with other high-power transmitters in the neighborhood. To achieve optimum intermodulation and large-signal performance, the TR144H uses only one PHEMT RF amplifier stage with a noise figure of 0.3 dB and an output intercept point of >25 dBm. A triple resonator helix bandpass filter provides optimum rejection of out-of-band signals and a high-level ring mixer (LO + 17 dBm, 50 mW) with output diplexer converts the input signal to the IF band at 28 MHz. The overall gain in the receiver path was deliberately set to only 15 dB, as even high-performance HF transceivers have still large signal problems at 28 MHz. For EME and DX work or for long antenna feed cables we recommend a preamplifier like the SSB Electronic LNA145 or KUHNE Electronic LNA144 Low Noise Amplifier mounted directly at the antenna feed point, using separate receive and transmit cables. Here You need only one additional high-quality coaxial relay, as the TR144H provides a separate receiver input (N-Connector) and a sequencing.