This just gave me a great idea... If any of you have a LP-100A you can connect an antenna directly into the back of the unit (where the couplers normally connect) and the unit can then be used as a field strength meter and it will give values in dBm... Thats totally how I'm going to determine if my separation is going to be good enough...
My hope is to be able to have 3 antennas on the K3 two which are TX/RX and one RX only... The RX only antenna I'm going to run through an ICE 196 RF Limiter (http://www.iceradioproducts.com/reconly.html#rflimiter). It starts limiting things to .3VRms so that should keep things happy... ~Brett (N7MG) On Thu, Jun 24, 2010 at 11:14 AM, Wayne Burdick <n...@elecraft.com> wrote: > Hi George, > > If you have an RF voltmeter or milliwatt meter, try terminating the > proposed RX antenna in a dummy load, then measure the voltage or power > when you transmit. If it's less than about 2.23 Vrms (100 mW, or +20 > dBm), you'll have no trouble at all. > > The subreceiver (as well as the RX ANT IN jack) can generally handle > far more than this without damage; I pumped several watts in during > early testing. But you don't want to take risks in the field, or have > the COR (carrier operated relay) switching in and out during keying in > CW mode. Antennas can change pattern due to wind, rotation, etc. > > If the power at the AUX RX input (sub receiver) looks like it may be > excessive, you can take additional precautions. You could move the RX > antenna farther away, put it in a null of the TX antenna, reduce its > gain (length), or use the KEY OUT line to drive an external shunt PIN > diode switch. > > 73, > Wayne > N6KR > > > On Jun 24, 2010, at 10:04 AM, George A. Thornton wrote: > >> I am planning to use my dual receive K3 for field day and we want to >> try >> out diversity receive. >> >> >> >> This particular setup will be for 20 meters only. The primary antenna >> will be a 20 meter monoband Yagi mounted on a 40-60 ft. tower. >> >> >> >> We were considering using a Buddipole mounted in vertical position and >> tuned for 20 meters voice to serve as a Rx only antenna for the sub. >> All transmission will be from the Yagi. I was planning to hook the >> Buddipole into a Rx only connector. >> >> >> >> We will do the best we can to isolate the two antennas but having not >> been to the site before I am not sure what will be possible in the way >> of geographic isolation. >> >> >> >> I want to make sure I won't do any damage to the K3 in case the >> isolation is not sufficient. >> >> >> >> Anyone familiar with this situation able to give me some guidance? >> >> ______________________________________________________________ >> 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 > ______________________________________________________________ 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
