David, the problem is that original KD9SV FES unit is not protecting your radio against the another RF power sources (SO2R or MM site operation)... FES unit is disconnecting ext. RX antenna and grounding the input RX port just when the unit is activated by own radio PTT signal.
In that case the limiters like FEP seems to be much better and it will do the job perfectly. Martin, OK1RR has new design of the FEP RF diode limiter for homebrew, just the article is in Czech language: https://www.okdxf.eu/index.php/technika/272-ochrana-vstupnich-obvodu-prijimace Do not worry to ask him for help. I am using his design as an upgrade of his preview KD9SV saver project and it works perfectly as everything designed by him. An interesting thing on EA4TX TRX-FEL design is that it can protect also all the main TRX ports on the radio (not only ext. RX antenna port) in SO2R and MM operation. Ref: AS-RXFEP Limiter (Array): https://www.arraysolutions.com/surge-and-rf-protection/as-rxfep RX-FESSS (KD9SV): https://www.dxengineering.com/parts/svp-sv-fesss DXE-RG5000HD Limiter (K3LR): https://www.dxengineering.com/parts/dxe-rg5000hd TRX-FEL (EA4TX): https://ea4tx.com/en/tienda/frontend-limiter/trx-fel/ RX-FEL FE Saver (FEP EA4TX): https://ea4tx.com/en/tienda/frontend-limiter/rx-fel/ RFEP (Cross Country) UK: http://www.crosscountrywireless.net/receiver_protection_unit.htm FES KD9SV (OK1RR): http://www.ok1rr.com/index.php/technical-topics/39-yet-another-front-end-saver FEP Diode Limiter (OK1RR): https://www.okdxf.eu/index.php/technika/272-ochrana-vstupnich-obvodu-prijimace ----- 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt -- Sent from: http://elecraft.365791.n2.nabble.com/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
