http://www.elecraft.com/K3/mods/K3%20rx%20protection%20mod,%20rev%20B.pdf
That document explains a mod that you should definitely make sure is in place in your radio if you're worried about this condition. I had one of Q8 and Q9 blow in my radio after too much power came back in from another operator who told me he *WAS* staying off of 20 meter like to told him to do he was down on 14 meters! ;) Anyway we replaced the Q and the rig came back to life. But if you view that document it says that when you get to +13 to +20dBm it will automatically engage the preamp for you. +20dBm is 100mW so that would at least give you an added 10dB of protection on your way up to the 1-2W realm. ~Brett (KC7OTG) On Mon, Mar 8, 2010 at 2:03 PM, Jim Harris <[email protected]> wrote: > > Hi Folks, > > I'm currently selling an off-shore rig with the hopes of acquiring a second > K3 for SO2R, primarily for RTTY contesting. I believe I've seen somewhere in > the not to distant past that is was said the K3 receive front end can > withstand 1-2 watts without damage. I've spent the last hour reviewing the > email archive and can find no reference to that. Can anyone confirm or deny > my remembrance? (Or, is it all just wishful thinking?) Is there anyone on > the reflector that is operating a K3 SO2R station without the thousand or so > dollars of band pass filters needed to protect the radio's front end? > > Second part of the question is.....if possible to not damage the front end, > what is the possibility of desensing or causing blocking or noise that would > interfere with reception on one receiver when transmitting on the other > radio. I'm sure that is highly dependent on band(s) and separation of > frequencies within the band. I'll fully aware of the K3's ability to > completely block signals a few kilohertz away but when RTTY contesting I do > seem to notice there may be some desensing or AGC action from these signals > even though they are not heard or processed by MMTTY. > > Comments very much appreciated. > > CU in the Colorado QSO Party Sept 4th, 2010. > > 73, Jim, W0EM > > > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
