Recent advances in orbitron microwave development

Summary form only given, as follows. By using a low-impedance Mylar line for pulsed power feed at low voltages (5 kV) and a special power feed to avoid electron ejection by magnetic forces, about 1 kW of microwave power has been produced in the 10-cm band. This orbitron is gas filled to provide electrons by ionization. The second orbitron advance was to use a split cathode coupled to a resonant circuit. This provides a resonant system for the orbiting electrons to couple to, generating more power in a narrow, fixed frequency range. This orbitron uses a tungsten heated cathode for electron injection. The device operates well, producing a narrow line at 145 MHz at a power level of -20 dBm (0.01 mW) as picked up by an external antenna. The coupling has not been optimized