VK4WDM wrote:My recent failed attempts to work VP6DX on 160 and 80m suggests that I need to do something to improve my antennas for those bands. At present I use a windom cut for 160m and fed with a balum and 50 ohm coax and a tuner. It loads ok but the on-air results are poor.
I have an acre of land with the long axis running roughly east west and a 50ft tower. I have considered using a vertical but this is a very noisy location up here in the static-filled tropics.
I am thinking about putting up a horizontal delta loop. The feed point will be at 50ft but it will have to slope down to only 20 feet as I can't put up higher poles on that boundary. It will point down the long axis of the block i.e towards the west.
Is a delta loop the best option? If not, what is?
I would appreciate some advice.
73 Wayne VK4WDM
VK4WDM wrote:Dear All
Some good ideas, thank you. Owen has prompted me to mention that I feed the windom via a 4:1 balun. I used Beveridge Antennas at my previous location in Tasmania and they worked quite well but they were 300 yards long. Maximum run here would be about 60 yards and it would point east west, not a favourable direction for an end fire antenna.
A 90ft vertical is out of the question because we live in "cyclone alley" and it is very hard to get permission to put up even a 50ft tower. One option might be to mount a loaded vertical on the garage roof and use the roof as a ground plane for transmitting and a long wire for receiving....
VK4WDM wrote: A sloper would be possible but an inverted L would be difficult because the far end would only be 18 ft off the ground - more like an end fed inverted V.
VK4WDM wrote:The windom I am using is a copy of the BuxCom 160-6m model. 260ft long, off centre feed with a 4:1 balun and 50 ohm coax. It is 50Ft in the centre and 18ft at the ends and runs corner to corner across the block. I am suprized that it does not work better on 160 and 80m. It works quite well on 30, 20, 17 but not as good as my dipole on 40.
A 160m inverted V would fit in ok, should I just opt for that? Perhaps dual 160 & 80?
VK4WDM wrote:This is obviously a "hot" discussion topic! With regard to windoms, the classic design was very common when I came on the air in ZL in 1964 but quickly died out later for two reasons: TVI, and the later still the advent of solid state equipment that does not tolerate high SWR (tuners were rarely used). I used one back then and it worked very well (DXCC on 80m) that why I was attracted to the modern version (as Own says, really "windom-like" rather than windom) as per the following site:http://www.packetradio.com/windom.htm.
Whatever I put up as a replacement is going to be sub-optimal - I only have planning permission for a single 50ft mast or tower. I will put up an inverted V this weekend and see if there is an improvement. If not, I will think about a loaded vertical of some sort.
VK7AXZ wrote:Don't just put up a standard 80m inverted V, get a roll of cheap RG58 and put up a double bazooka in the widest Inv. V formation you can - wide band, low noise and very effective. At a centre height of 50ft it should work very well.
There is much more info than this avail. but this gives the basics.
VK4WDM wrote:The double bazooka look's very interesting!
VK4WDM wrote:I wonder if you can short the end of the feed line of an 80m one and feed it against ground for 160m like you can with a standard 80m dipole?
Users browsing this forum: Google [Bot] and 3 guests