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KH6NX Hawaii flag Hawaii

alias for: W7NX


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QSL: DIRECT/BURO/LOTW

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I have been continuously licensed since I was 14 years old, in 1979, originally as N7ATM, then as W7NX from May 14, 1999 through July 17, 2014, and now as KH6NX from July 18, 2014 to present. If anyone still needs confirmation from N7ATM, or W7NX, I still have logs from those years.. N7ATM has since been reissued. I completed residency training in internal medicine in June 2013, and have moved from Oregon to Hawai'i to take a position at a local hospital in Honolulu. Thus I have changed my call sign from W7 to KH6. Medicine is a second career for me. Previously I was an electrical engineer. I designed high speed computers, cameras, and radios during most of my career. In addition to my medical degree, I also hold a BS and MS in electrical engineering.

I enjoy home brewing, working DX, and I operate mainly CW. I enjoy contesting and will usually be on the air for all major CW contests, if I am not working in the hospital. My current station is an FT-1000MP as my primary radio and an FT-857D in reserve. My main antenna is 3 element tribander at 40 feet stacked with a 3 element 6M yagi at 45 feet. I have a fixed dipole with feedpoint autotuner for 160/80/40/30/17/12 and a rotatable trap dipole for 40M as part of the tribander.

I am now on LOTW for contacts made Starting November 2013. I enjoy sending and receiving actual QSL cards. LOTW and similar services are fast and easy, but I think a lot of the charm of QSL-ing is lost. Please QSL direct, if you want a paper card. Via Buro is okay too, but will take longer. I will get to it.

QRP with toes in the sand on windward Oahu

When I arrived on island, several of the local hams, in particular WH6R, pushed me toward trying vertical antennas at the seashore. Verticals at the shoreline work very well, even QRP. The antenna in the background is a 15M half-wave vertical dipole, end fed, supported on a DK9SQ fiberglass mast (available from www.kangaus.com) and attached with painter's tape (foreground). This antenna is about 6dBi and has a very low angle or radiation (see pattern above). This is important from Hawaii since we are 2500 miles from anywhere. Actually, it is important from anywhere if you want to work DX.

Technically you can't feed the actual end of a dipole, as the current is zero at that point and impedance is infinite. I'm feeding close to the end. The remainder of the dipole is either a small counterpoise or the coax (not ideal). In this setup I was using a tuning box sold by the Emergency Amateur Radio Club (www.earchi.org) here in Honolulu. It consists of an L-network with a section of RG-174 as a capacitor and a powdered iron tordoidal inductor. There is no provision on the EARC matching networks for a counterpoise (easily added if desired) thus the coax shield will be used to complete the antenna. The purist in me does not like this approach, but this method works well. It is very fast and easy to set up, in keeping with the EARC charter of emergency prepardness. It could be improved on by addition of a choke to the coax (coil coax several times with 6-8" diameter) a foot or two from the match-box. This will decouple the remainder of the coax from the antenna system.Tuning is by adjustment of wire length. SWR is low and no additional antenna tuner is needed once tuned.

Sunrise on Kailua Beach

73, and Aloha from Hawai'i

 

 

1393290 Last modified: 2014-10-31 01:19:47, 4231 bytes

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