[Moon-Net] LNA Relay

vlada vlada.masek at volny.cz
Fri Sep 27 11:12:10 CEST 2019

Hi Voja,
as regards LNA input protection, the transfer relay behave actually in the same way as a single port relay.
So, the level of protection just depends on the isolation of the particular relay and proper function of the sequencer or similar function circuitry.
Additional relay at LNA input is almost necessary in case of separate but close RX/TX feeds (like septum feed) with limited isolation in-between.
Optionally, if the relay isolation is insufficient or you are looking for a secured protection, you could use an additional protection directly on LNA input either outside or inside (like a power limiter used e.g. in spectrum analyzers or an antiparalel vhf Schottky diodes etc.).
However, al these units will obviously somehow (more or less) decrease the noise performance of LNA. 
73, Vlada
> Od: "Vojislav Bandobranski via Moon-net" <moon-net at mailman.pe1itr.com>
> Komu: "Moon-Net" <moon-net at mailman.pe1itr.com>
> Datum: 26.09.2019 21:39
> Předmět: [Moon-Net] LNA Relay
Hi,does anyone have experience with using a transfer rf switch (with 4 connectors) in LNA?Is it necessary to add another relay in front of LNA input for insulation?I mean simple rx/tx transition.
73 de Voja/YU7C
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