When you have a low impedance antenna (in this case ~35 ohms) going to a higher impedance feed line (either 50 or 75 ohms), I would use a hairpin coil across the feed point rather than a tuner at the
Even if it doesn't seem logical, you should try it! At C6ATA last year in the CQWWCW, my primary 80m antennas were a parasitic 2 ele array (35' high with top hats - i.e. converted 40m verticals) for
I haven't used one, but what about renting a wire/cable trencher from your local equipment rental store? Here's a video of one type http://video.google.com/videoplay?docid=3967613380941633039# though
This is way cool. Are there similar sites in Asia/Pac? Or is others around the world? 73, Kenny K2KW -- Message: 5 Date: Tue, 29 Dec 2009 08:38:21 -0330 From: "Frank" <fdavis@nfld.net> Subject: Topba
While many of you are on the CQ-Contest reflector, I thought I would repost here. I suspect you will enjoy the videos on the 160m antenna used by C6ARR/N6BT in the recent CQWWCW contest. 73, Kenny K2
<SNIP> You could also try 10 or 12 turns of #12 or 14 gauge wire, 2" diam across the feed point and ground. Spread/compress the turns to get the lowest SWR/best match. Just to be specific: this "hair
Rune, Back in 1997 N6BV and I did some testing using "ladder line" (not the real 600 ohm stuff) and some 9:1 baluns on each end. We were looking at a site in YV where the beach was about 1000' from t
Below, KK9A took a snip from my web page. When I wrote that, I missed one very important point: simple trigonometry. Let's imagine a perfectly straight coastline, and we place a 160 vertical 1/2 WL b
Bob. Your impedance is likely in the 25 ohm range, so you would need a 2:1 balun. A 4:1 likely overshot the 50 ohm mark. I'd just go with a hair pin coil between the vertical and ground. About 10 tur
Has any analysis even done comparing the N4KG reverse-fed tower feed method with elevated radials vs a shunt or omega feed with ground radials? This is a tall tower and I think it will be close to se
I meant to ask if the antenna efficiency (dB) was better with either feed method. Regards , Kenny K2KW _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Hi Guy, and thanks for the reality check. My friend has a 130 tower with 2 StepIR Yagis on top and hes been running the reverse- feed for a while. I was operating the first 6 hours of ARRL 160 contes
Hi All, were planning on gamma loading a 130 tower with a stack of StepIR antennas using a cage for the shunt wire. We have modeled the tower. Question: is the model sufficient to determine the gamma
Hi Tree, many thanks for the background on the dream beams! QSL on the effective tower length. ON4UNs book says aunt feeding will work up to 140 degrees. My friend is doing the modeling and its hard
I agree that 5m high is better for elevates radials. If you go with 2 full size radials, start the radials as a dipole at the installed height and tune to resonance. Once tuned, remove the coax and s
Hi All, Thanks again for your help back In December. KC4Ds 135 tower (110 degrees electrical length) with an omega match is up and running. There are 60 110 radials though half go out 40 and are coil
My new house has 6 wooded acres in roughly a square. For EU, I was hoping to get a pair of phased 500 beverages spaced 350 apart. To do that, one of the 2 beverages will be 110 in front of the other
Thanks Frank & Dave, The spacing and stagger I mentioned just doesnt seem to work (the rear and side lobes and ultimately the RDF) regardless of the phasing. If Im going for max RDF to EU that fits i
Hello, I have an inverted-L and the radials are laying on the ground AND the coax is on the ground too with radials right near the coax run. Do I need a choke to stop any feedline coupling/radiation,
Thanks Mike. I wasnt sure if one was needed where the coax exits the radial field Regards , Kenny K2KW _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector