Brett, Thank you for the link. As I mentioned in a reply to someone else my radio has the mod. In lieu of any definitive statement from Elecraft it probably would be best to go in the safer direction of using filters.
CU in the Colorado QSO Party Sept 4th, 2010. 73, Jim, W0EM > From: br...@livecomputers.com > Date: Mon, 8 Mar 2010 16:04:28 -0800 > Subject: Re: [Elecraft] K3 SO2R Question > To: w...@q.com > CC: elecraft@mailman.qth.net > > 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 <w...@q.com> 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:Elecraft@mailman.qth.net > > > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
