Used my LP-100A to check the isolation between my main antennas and pennant receive loops, worked out great.
Stewart G3RXQ On Thu, 24 Jun 2010 11:27:52 -0700, Brett Howard wrote: > 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 <[email protected]> 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:[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 >> > ______________________________________________________________ > 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
