Archive for the ‘antennas’ Category
USS Slater
At the beginning of the month, I posted about a Special Event Station – K2N, that was going to be operating from NY State aboard the USS Slater.
As luck would have it, my schedule did not permit me to get on the air that day “to give a shot” at working them. This was a disappointment as I love working Special Event Stations, especially those that in anyway commemorate our Military or our Veterans.
Fortunately, Stan WB2LQF announced on the e-mail reflectors about a video posted to YouTube showing the day’s activities. Here it is:
On a different note, I spent the evening printing out certificates for the 2012 NJQRP Skeeter Hunt. The top five finishers, as well as the high scorers from each state or province that entered should be seeing something in their mailboxes within the next week or two.
Again – thanks to all for making this inaugural 2012 event a big success!
Lastly – ATTENTION KIT BUILDERS !!!!!!
The ARRL wants your input, as they are looking for recommendations for “easy to build” kits for first time or Newbie kit builders. The link to the page is: http://www.arrl.org/news/attention-kit-builders-the-arrl-wants-to-hear-from-you.
I recommended the ACME QRP GC100 Gel Cell Charger Kit. It was easy to build and is highly functional and usable. What more could you ask for?
72 de Larry W2LJ
QRP – When you care to send the very least!
Tuning up an NA-666
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.
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| 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.
Antenna Restrictions on Mt. Evans? The Conclusion
I finally received a letter from the Clark Creek Ranger District regarding my encounter on Mt. Evans (read the first part of the story if you are not familiar with it). It took me almost six weeks and several e-mails to get an official statement from the Ranger District. I guess an underfunded federal agency has more pressing issues to deal with.
The good news is that it was an over-eager FS employee who kicked me off the mountain.
The bad news is that, according to the letter, the Federal Code of Regulation [36 CFR 261.10(a)], which applies to communication equipment, is written with some built-in ambiguity and might be interpreted differently in other Forest Service units.
Well, I will deal with another interpretation if and when I run into another issue. The Clear Creek Ranger District interpretation however makes sense to me – chapter closed!
I really appreciate the clarification.
Read the entire letter by clicking on the thumbnail to the right.
That’s my last post from Mt Evans but there are two more pictures I wanted to share. The first one was shot at the Summit Lake trail-head early in the morning. The trail starts on the right side of the picture, goes up the ridge to Mt. Spalding and over to Mt. Evans.
The second picture is from a close encounter of the third kind… well, not quite but is was remarkable. This unflinching mountain goat approached me. The picture is shot with a 52mm lens, not a tele-photo lens. He came up to me at arms lengh… too close for my taste. I normally try to keep a save distance between wild animals and myself, but this guy was not shy at all. Since I had never heard about occurrences of rabies in mountain goats and since I received some goat combat lessons earlier in the year (courtesy of Rooster) on my trip to Mt. Herman, I took the chance to take some real close-up shots instead of retreating.
73, Matt/KØMOS
Strange
Lots of yard work today. As a reward, I put some time in behind the key tonight. All the bands seemed to have a lot of background noise tonight for some reason. Last night, while listening on 20 Meters during the QRP Fox hunt, the background noise was almost non-existent.
Anyway, I worked OK1DX on 30 Meters at 10.120 MHz. He was calling “CQ DX” and wasn’t getting any takers. So I threw my call out there and got an immediate response. Pavel was 579 here and I got a 559 in return. No surprise there. The QSO was a bit more than your normal run of the mill DX QSO; and by the end, Pavel had told me that I had also come up to 579.
Here’s the kicker. I was running 5 Watts to my 88′ EDZ antenna. He was pushing 400 Watts into a dipole. My first inclination at learning he was pushing 400 Watts, was to wonder why he was only 579 here. I would have thought at that power he would have been 599+.
Of course, there are reasons for that, I know. But sometimes, even as a QRPer, I fall into that “more power equals louder” trap myself.
72 de Larry W2LJ
QRP – When you care to send the very least!
Learning something new
You never know when you’re going to learn a new and better way of doing something. TJ W0EA posted this on the KX3 list, which led to (what I thought) was a fascinating discussion on how to coil and store antenna wire.
You’d think that winding up a wire antenna is a pretty mundane thing, eh? But no, there is an art to it, so that when you’re out in the field, you’re not dealing with a tangled mess and cussing like a sailor on shore leave. I tried the method shown above and dang it! It works!
I love it when I learn a new way to do something better.
I am taking some needed vacation time from work on Friday and Monday. Have to use what days are coming to me as I found out my department is being eliminated due to a contract change. Originally, I was given to the end of August; but found out that I was extended until the end of October, in order to help train the guys from the new company that is taking over the contract.
But I digress. I still have a lot of yard work to do and hope to accomplish it over this prolonged weekend. But I am also hoping to perhaps get out to one of NJ’s state parks to do a park activation. Maybe Hacklebarney State Park which is located between the villages of Chester and Long Valley in Morris County. If the weather’s nice on Sunday, perhaps the KX3 and the PAR can get a workout.
72 de Larry W2LJ
QRP – When you care to send the very least!
















