There are a number of projects currently being developed including replacement 2 and 6M band masthead amplifiers and the much anticipated 70cm and 23cm masthead amplifiers. Its been difficult to source suitable relays for the 70/23cm preamps that can handle up to 100watts SSB and also have enough isolation. The Axicom HF353 relay has been chosen as it is a good compromise on performance and cost so will be used on a prototype for testing. I will also do tests with the PGA103 and other low noise high dynamic range amplifiers, although it does make it difficult to add a low loss tuned input circuit for out of band rejection to 50ohm input amplifiers.
Solomon R. Guggenheim Museum Photo 2018-06-07 15:58
Solomon R. Guggenheim Museum
Fenerbahçe Photo 2018-06-07 14:49