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Not a good start for W2LJ in the inaugural week of the 2012/2013 Winter QRP Fox hunt season.  I only worked one of the four foxes – Jim K4AXF who was one of the 80 Meter Foxes tonight.  I was able to hear Ron KI0II in Colorado rather well for 80 Meters, but could not make myself heard to him.

The 40 Meter hunt on Tuesday night was a complete bust.  I never heard AA4XX at all, all night long.  I did hear Kevin W9CF in Arizona very weakly; but then W1AW code practice came on and that, as they say, was the end of that.

It’s supposed to go up into the 50s to near 60 this weekend.  Maybe I will be able to build and hoist that W3EDP antenna, now that the hurricane and snowstorms have passed.   Maybe I can make the weekend “a twofer” as we say in the Fox hunt world – antenna in the air and leaves off the ground!

72 de Larry W2LJ
QRP – When you care to send the very least!

Last summer I built myself a Cobwebb antenna and was fairly pleased with the results. I did think it was a bit heavy and was looking to repeat the build with some lighter weight wire until I came across this article from a well-known antenna buff, G3TXQ. It looked like just the ticket so I copied the design and low and behold after a few evening work I finished it off. Here it is during the tuning phase of work which I completed over the weekend (which by the way is as simple as tuning any dipole).

By the way the tropical weather (read blue sky) in St Bees is a welcome change from the recent flooding. I doubt it’ll last though!

You can see the usual antenna laying down in the background, which is a Hustler 6-BTV vertical which has suffered at the hands of the strong winds and salt air we get here. Once I had assembled both the antenna’s I was able to make a bit of a comparison between the two. The vertical is a good S point down on the Cobwebb on 20m, 17m and 15m and about the same on 12m and 10m (at that height!). To be fair it doesn’t have the 17m stub so that’s a bit of a poor comparison. I did managed to get it a little higher with the fishing pole but need to work on the mounting point and ‘environmental protection’ that it’ll need to be used here. Either that or it’ll go into the loft with the 40m dipole that’s up there at the moment.

For some reason I really enjoy these antennas, either to build or use but Michael, ZS1RJQ who I’m in regular contact with over email has built a fair few more than me. His are far more robust than mine but between us we’ve discussed the hardware side plenty of times and before long we’ll end up with an optimised lightweight design. This one is so far the most compact and well worth a tinker if you’re into that. Thanks to G3TXQ for the original design.

With Halloween coming up shortly maybe I’ll put a spider on it!

I’ve written on the subject of fake HT antennas on eBay before. It’s a matter of concern whether an antenna is fake or genuine. Lately the antennas sold under the Nagoya brand name have come under suspicion. Recently purchased antennas have blue lettering printed directly on to the base, similar to some fake antennas purporting to be made by the reputable Diamond Antenna company.

Two identical fake hologram labels

These new Nagoyas come in an orange plastic sleeve rather than a yellow one. The sleeves carry a silver hologram label with two serial numbers on them. Presumably the idea is that if you want to check an antenna is genuine you can contact the manufacturer, give them the numbers and they will confirm or deny that the product is genuine.

Today I read in a Yahoo group that someone had obtained an antenna with an identical hologram sticker to another member. I have two such antennas but I had never thought to check the stickers. When I did, I found that the stickers that came with two different Nagoya antennas were identical!

You probably can’t read the numbers off the picture above (try clicking the picture to see the full-size version) but the top number is TWx00647488x where x is a Chinese character. The lower number is CNx3333081x. If you have recently purchased Nagoya antennas and got ones with the silver sticker, I bet they have the same serial numbers!

It seems that the only way to get an HT antenna that works is to buy a Diamond branded antenna from your reputable US, UK or EU dealer! Better still, take an antenna analyzer with you and test it before handing over any money.

I measured out the distances from the house to the maple tree in the back yard and over to the mast in the “upper right” corner of the back yard.  The 85 foot W3EDP will fit just fine, with room to spare.  There should be less than 10 feet worth of Dacron rope between the end of the antenna and the mast.

The drawing is not to scale; but the run along the side of the house accounts for no more than 15 to 20 feet or so of the antenna run.  The EDZ currently follows the same route (more or less) but I am hoping to get a dog bone insulator (which will serve as the wire “bending point”) up about 10 to 15 feet higher in the tree than where the center insulator hangs for the EDZ.

Last Thursday, I ordered a 4:1 current balun from Universal Radio and I have all the other materials I need.  The balun should come during the week, and hopefully I will get to do some antenna installing next weekend.

In the end, this W3EDP will be configured as a horizontal “L” as you can see from the diagram.  The ends will be at about a 25′ level and I am hoping the point at where the wire will take its sharp right turn will be in the 35 – 40′ neighborhood.

72 de Larry W2LJ
QRP – When you care to send the very least!

The wire from my Inverted L End Fed Zepp met its doom this past August..  I went outside after a particularly bad evening of thunderstorms to find wire hanging down on the back porch and the other end hanging down the mast that was supporting the far end.  The gusty winds caused it to fall apart somewhere in the middle.

I didn’t use it much as I could never get a decent match on the antenna tuner.  For whatever reason, perhaps the truly random length of it and the lack of a decent counterpoise, it always gave my auto tuner fits and starts.

This evening (and for the past few evenings) I was following a discussion on W3EDP antennas on the Polar Bear QRP Ops mailing list.  I did a lil’ Googlin’ and came up with this:

http://www.qsl.net/w5rin/Projects/Antennas/ae5vv/W3EDPAntenna.pdf

I can (I think) definitely fit a 67″ hunk of wire along the run that was occupied by my ill fated EFZ.  According to the .pdf, that should make operations on 80 Meters and up possible.  However, I would really like to find a way to squeeze an 85″ piece of wire, in order to make operations possible on 160 Meters, too.  I know, not nearly an ideal antler for 160 – but something is better than nothing (which is what I have right now).

I have the ladder line and I have a heavy duty 4:1 balun that my friend Bob W3BBO was not using and sent me.  I have the wire and the coax is still there. I just need to cobble one of these together and get it up before the weather really turns nasty for the winter.

72 de Larry W2LJ
QRP – When you care to send the very least!