I couldn't agree more, Hank. That COR is a warning flag, and in my humble opinion, not something I would consider for normal operation ;)
I'd also be interested in Elecraft's take on this. At what level does it kick in? Also, what is the level of isolation between Aux RX In and the main coax input/output? -Chris On Thu, Aug 6, 2015 at 1:47 PM, Hank P <[email protected]> wrote: > The external reed relay /miniature relays are OK IF they are keyed by the > key line AND the RF is delayed a few ms from key line down.(K3 does this) > The diode limiter circuits like the AS and others like that don’t have this > limitation. > > BUT I would be interested in the OFFICIAL Elecraft position on their COR > > What bothers me about it is that if the internal relay is clicking , it > has to already have seen enough RF to be considered potentially damaging in > order for the K3 to decide the relay needs to be actuated . So the barn > door is closed after the RF has been applied for an unknown period but > surely a couple milliseconds. > > I am a belt and suspenders type guy especially with expensive equipment - > and my feeling is that the K3 COR is telling me to DO SOMETHING ABOUT IT > NOW. I would never continue to operate with it actuating. I treat it as a > nice warning thing Mr. Elecraft has given me, not something to be used > continuously. > > I made my own RX ant protector with a little DPDT miniature relay that > has gold plated contacts . It is wired so the rx ant line is opened and > also the K3 rx input is shorted. One could argue which should come first I > guess but I get over 100 dB isolation on 160 measured with VNA. > > Hank K7HP > > >> I'm looking for a device to protect my K3S front end when using a RX >> antenna. As I key my rig I can hear the COR clicking and it's making me >> nervous. >> >> I have seen the AS-RXFEP review by W1ZR in QST. I have also seen devices >> with reed relays on the web. What are you using or am I just foolish to >> worry about this? >> >> > ______________________________________________________________ > 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] > -- Life is like Linux - it never stands still. ______________________________________________________________ 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]
