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Apart from G4IKZ (18km) and G4FFC (45km) all has been quiet on 6m WSPR since the 14 spots exchanged with CN8LI (2113km) – last spot 1558z.

On 2m late afternoon stations were calling “CQ sporadic” on SSB, although when I listened no DX was heard from Europe.  I think the Es MUF must have exceeded 144MHz briefly.

Its not often I get a bumper crop of contacts on the UKAC series but 2m offers probably the best opportunity. Last weeks 6m contest gave just a handful of contacts but last night 26 contacts that ranged from Perthshire in the north to the south coast. I usually don’t hang about past about 21:30 anyway and as conditions were deteriorating I decided to come home and sort out the log.

Operating /p with just 10w and a 5 ele beam means I can go out with the minimal equipment but I was very jealous of the Wasdale Mountain Rescue truck who had not read the memo about Sandwith being ‘my spot’. Not only had they beat me to the best spot but they had a Clark pump up mast that looked great. I’ll bet their best dx was worse than mine

All in all a good evenings work. Made better by the warm and wind free evening. I’m beginning to think I’ll wake up in a bit.

Last night I went on 2m SSB with 5W in the monthly UKAC activity contest. After 1 hour and 40 minutes I had to stop as my voice was gone (stroke).  Best DX missed was GI6ATZ in N.Ireland. I called him a few times without success.

In all 16 QSOs were completed showing that modest power and antenna from the home QTH is enough to enjoy the contest. Had I stayed on longer I’m sure I would have worked more squares. Quite a few stations in northern England worked too on the small, hand rotated, 3el beam, from the home QTH.

Looking at the map, I should have turned the beam towards the SW.  Hardly likely I’ll come other than close to the bottom, but that was not the point – it was good fun taking part.

2m stations worked with 5w/3el UKAC June 3rd 2014

This Saturday morning there was a big Sporadic-E opening on 6m. There were some pretty big signals, though once again I seemed to be on the edge of the opening. The Sporadic-E seemed centered over northern Europe and you can see from the map that it was pretty intense!.

6m on 18 May 2013 at 0930z. Map from DXMaps.com

I had KComm’s DX Cluster window open. I don’t use the cluster on HF and dislike it intensely, but spotting stations on the cluster (in a specific format with locators for both endpoints) is how VHF contact information gets to DXMaps.com.

I saw a couple of contacts from Ireland spotted on 2m so I switched bands.

2m on 18 May 2013 at 0940z. Map from DXMaps.com

As you can see, two lucky EI stations managed to work into northern Italy, one of them using a vertical antenna! Signals must have been strong but when I QSYed to 2m I didn’t hear anything. The Es must have been over the northern French coast and you can see that the same Es cloud must have permitted F6HTJ to spot the GB3ANG beacon and enabled DG7IG to work EA1CCM as the paths intersect at the exact same point..

I wasn’t lucky on 2m but I was a bit more successful on data and tuned to the PSK part of the 6m band just in time to catch a French station signing off with Tim, G4VXE. I managed QSOs with Gerard F4LKG and George EA4GB but I don’t think many stations were listening because my CQs went unanswered.

It seems as if the 2013 Sporadic-E season is off to a good start!

The Nagoya VHF/UHF antennas made in China and available from sellers like 409Shop are popular and cheap, but I think they leave a lot to be desired in the quality control department.

A couple of years ago I bought a Nagoya NA-666 with a regular male SMA connector for use with my Kenwood and Yaesu rigs. I was impressed with the performance of this antenna, and with the fact that it achieved a true 1:1 SWR at bang on 145MHz.

So when I ordered another antenna of the same model but with a BNC connector to work with all my HTs (which have now all been fitted, where needed, with SMA to BNC adapters) I was surprised to find that its performance was a disappointment.

I am well aware of the existence of fake antennas on eBay and have bought more than my fair share of them, but this looked to all intents and purposes to be a genuine Nagoya (silver on black label on the base and a serial numbered Nagoya hologram on the pack.) It had been purchased from 409Shop, a reputable seller. However, when tested on my RigExpert AA-200 antenna analyzer the nice sharp SWR curve dipped to a minimum at 135MHz – 10MHz too low. The SWR at 145MHz was off the scale. Ho hum.

As any ham knows, if an antenna tunes too low in frequency the solution is to cut bits off. After a bit of a struggle the rubber end cap came off and I gingerly pruned about a tenth of an inch . The antenna analyzer showed the minimum SWR point had moved up 1MHz. So I carried on with the cycle of cut, test, cut, test until I had achieved a much more reasonable SWR at 145MHz.

Final SWR curve of the shortened antenna

As I approached 145MHz the antenna was now quite noticeably shorter and I was concerned that I may have passed the point at which the improvement due to a better match was counteracted by the reduced size of the radiating element. I may have passed that point but it is very difficult to make reliable and repeatable field strength measurements. Therefore I didn’t make the final cut which would have brought the SWR (shown above) to 1.0:1 at exactly 145MHz.

Field strength measurements and on-air tests led me to the conclusion that the 7-inch shortened NA-666 performed 2-3dB better than my 8.5 inch long NA-701. It beat all the stock rubber ducks by another 2 or 3 dB. The only antennas that outperformed it were a quarter wave telescopic (19 in long) an even longer Nagoya NA-767, a nicely made but unbranded “RH-770” and a “Diamond” RH-205 5/8 wave telescopic, all of which are really too long and cumbersome to use with a small radio like the Baofeng.

Using the shortened NA-666 I have had solid simplex contacts with 5 and 9 reports over distances of several miles and can even access a repeater 50 miles away from inside the shack. So I’m pretty pleased with the result.

2m on 1-7-2012 at 10:20z from DX Sherlock

Going on right now, on 2m. Why don’t we get such openings here?