Does anyone have ideas for receiver front end protection at LF and MF? I am worried about my TX signal damaging receivers. Of course the best idea is to disconnect the RX antenna from the receiver wh
Hi Paul, It strongly depends on how your front end is designed. Am 10.07.2018 14:04, schrieb N1BUG: Now I have a pair of back to back 1N4148 diodes across the receiver front end but I don't think thi
Hi Stefan, I am thinking they only limit peak voltage to 0.6V? If that's right, then I think this is about +5 dBm, perhaps still enough to damage a receiver. I was trying to avoid switching because w
Hi Paul, Am 10.07.2018 15:05, schrieb N1BUG: I am thinking they only limit peak voltage to 0.6V? If that's right, then I think this is about +5 dBm, perhaps still enough to damage a receiver. Rather
Hi Stefan, Here is a simplified description of the setup. RX antenna (at the moment, but soon to change or have more than one choice) http://www.n1bug.com/lnv.jpg Then there is a two way splitter. On
Here is a simplified description of the setup. RX antenna (at the moment, but soon to change or have more than one choice) http://www.n1bug.com/lnv.jpg Then there is a two way splitter. One output f
Hi Andy, It is the Softrock I am concerned about. I don't know what the FST3253 can handle but I don't fancy replacing them if something were to happen. I tried putting the diodes at the output of th
The softrock is a stiff FET gate switch. designed for 3.3V digital busses running at hundreds of MHz. If the input exceeds the 0/3.3V rails, it'll just clamp to them. The opamps are ... well ...
Hi Paul, Looks not critical for me. Just for interest, did you measure the voltage across the diodes during TXing on the TX antenna? I would leave it as it is. It is just fine i think. But beware of
Hello N1BUG, Hi Paul, As I am deeply entrenched in mending my TS-590 after a whoopsie put a load of 137kHz RF up its RX antenna socket I am very interested in proection measures too! But even more so
Thanks Andy. As usual, I've learned something. I guess that's why the Softrocks survived last winter with the RX antenna only 12m from the TX antenna! 73, Paul N1BUG
Hi Stefan, I did not yet measure the voltage across the diodes. When I finish the power supply and put my LF TX back on line I will make some measurements like voltage across the diodes while TXing,
Hi Chris, It is good to hear you are making such progress with the TS-590. Good job. Apparently my system doesn't need fancy receiver protection. The Softrock was a lucky choice in this respect. :) N
