Dick, Instead of the G5RV antenna, consider using a modified version of it, the ZS6BKW, with your K3. The ZS6BKW antenna has better impedance characteristics on more bands than the G5RV. The K3's ATU matches the antenna on all of the bands that it is designed to work on, 80, 40, 20, 17, 12 and 10 meters. It will also work on 6 Meters, but its lowest SWR is at 51 MHz, not very helpful. The ZS6BKW antenna has a slightly shorter flat top and slightly longer section of ladder line than the G5RV. I've installed two ZS6BKW antennas with a 45 degree difference in orientation and can switch between either of them. On 20 Meters, the results is that the 4 major nulls of one antenna can be covered by switching to the 4 major lobes of the other antenna.
So, how do they work? Well, in the past 3 years since retiring from VOA and moving to a new VA QTH, I have worked 275 countries with 100 Watts. I recently added a borrowed 3 element tribander for most of the last 15 countries worked. Over 260 countries were worked using ZS6BKW antennas. With the K3 and its ATU the ZS6BKW will work well on 80, 40, 20, 17, 12 and 10 Meters. On 160, 30 and 15M, the ZS6BKW does not work well at all, even though the ATU can produce a match for the K3 on some of those bands. A ZS6BKW construction note, for one of the antennas I used a common mode RF choke made up of the 20 turns of the 50 Ohm RG58U coax feed line wound around a 6 inch diameter plastic COSTCO nut container. The second ZS6BKW antenna uses a choke made of the same type coax but wound on a pair of toroids, as described by Jim, K9YC on his website. In each case, the choke is installed where the ladder lead meets the coax and NOT at the shack end of the coax. If you are interested in the ZS6BKW antenna, check out the articles below. http://www.ab4oj.com/dl/sprat_zs6bkw.pdf http://www.w5ddl.org/files/Zs6bkw_vs_G5rv_20100221b.pdf 73, Rich - K1HTV www.k1htv.us = = = -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Friday, March 09, 2012 2:38 AM To: Elecraft Reflector Subject: [Elecraft] G5RV antenna experience on K3 Hi there-- Am considering putting up a g5rv antenna and was wondering what experiences K3 users have with this antenna. Is an external tuner necessary? Is internal KAT3 up to the task of taming this wire? Any hints will be helpful -- 73 de Dick, ka1oz Elecraft K3/100 GAP Titan-DX Antenna PS...Tried sending via my gmail account, but haven't seen it posted. I appologize for any wasted bandwidth. ______________________________________________________________ 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
