I’ve always been keen on making aerials and such, mainly wire contraptions and must have dozens of dipoles, vertical offerings and random wires in various states of use and non use scattered about the house here. One thing I hadn’t tried, until recently, was a loop antenna so decided to give it a go in the good old ‘sling it up where you can’ fashion. I didn’t have enough fishing poles to use so instead opted to just lay it on and over the house roof to see if it would be anyways useful. It is basically about 50 odd metres of galvanised electric fence wire (similar to bicycle brake wire)- around the roof, through the window frame,straight into a 4:1 unun and a two foot patch lead into the radio. The ATU in the radio handles the rest pretty much. This is about the peak of my Microsoft Paint skills but it gives an idea of the layout. I thought initially that it might tune 40 metres and up only given it’s physical size but the ATU in the radio seems to like it and tunes on 80m and top band too. I shudder to think how much strain is on it though and only use it down to 40m. Maybe I worry too much? I would love to know what the radiation pattern looks like! The bonus of the roofloop is that it is almost invisible unless the sun happens to be at right angles to it so it fits the bill as a stealth antenna which is good. Results are pretty good bearing in mind the simplicity and the less than ideal setting of the thing. I’ve managed to bag a chunk of Europe and into Asiatic Russia since it went up. I mainly work QRP and rarely go above 20w unless I’m hungry. I occasionally put the WSPRLite through it too and have been spotted regularly in France, Germany, Hungary, Southern Italy and Scandinavia etc on 20m firing just 100mW. A measly tenth of a Watt!! It is quite noisy on 160 and 80 but the noise is about 2 s-points down on 40m compared to a dipole. This improves further on the higher bands. My next tweak might be to elevate it a few inches above the slates along the bottom at both sides to see what effect it has. This will raise the whole […]
Here we go again, have had confirmation for the booking, the next CT meeting is go go go, same place same time, near enough. Of course Andy is in on it again, couldnt do it without him – wonder what he`ll have for us to play with this time? Thursday 20th – Sunday 23rd July 2017 The planned Antenna set up for Buxton is going to be a 5 element Yagi on the tower, set at 10 mtr will give perfect take off for Europe. if there is any Long DX coming in, we can raise the tower to about 20 mtrs and this will give a low Angle take off. If 11 mtr is a bit flat and drops off during the late afternoon I will drop the tower and put up a Moxon for 40 mtr DX into the night. For those that have not experienced the Ham bands before, do not panick, it is just like 11 mtr, will get you some Long DX contacts. Cant guarantee how the nights pan out, should get 5k miles contacts. Gear to be used, same as last year, TS 590, Mic or Headset with Foot switch, Acom Amp, Laptop Logging, some video recordings for you tube. Mighty fine comfy Plastic chair to stop you hogging the Radio for too long,LOL. I am sure you will all have fun with beer and BBQ into the evening as well. Lets hope that the weather is going to be kind to us. If there are any CW addicts coming, please operate the radio with both hands in ya pockets, LOL The Moxon is tuned for CW as well. but you will have to bring your own Key.
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