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Archive for Antenna

Smiley

Smiley Antennas

Posted by Jim Wilson 
· Saturday, December 1st, 2012 
· 4 Comments

There must be a rule that I’ve adopted — nothing can be left alone, always adjusting and tweaking — I’m sure it’s an ethos of continuous improvement. But, if only it worked out that way! The improvement part, that is. My latest adjustment, at least that makes it to these pages, is the search for a nifty antenna for my Icom ID-31A 440 MHz hand-held.

The impetus for this effort is that the ID-31A is a 70 cm only transceiver. So why use a dual 2M/70cm antenna? Well, the antenna that comes with the unit is a dual band antenna. So I began looking for both mobile and replacement hand-held antennas that were just for 440 MHz. I did find one mobile antenna, a Super-M 400 from MP Antennas. It looks really cool, too. But it does cost a fair bit. So after some searching and considering what my actual use will be for a mobile antenna, I decided on a Diamond MR-77. While it is dual-band, what I liked about it was the built-in magnet mount and the cable terminating in an SMA connector. So it’s one unit without adapters, etc. It works well. I’ve been using it primarily on Saturdays when I drive about 25 miles one-way to pick up my daughter.

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Smiley Slim Line 440 MHz
Smiley 5/8 Slim Duck 440 MHz
ID-31A Original Antenna

As to the hand-held antennas, I’ve provided a slide show of the ID-31A with the original antenna and the two Smiley Antennas that I’ve purchased. I tried the 5/8 wave Slim Duck first. You can order the exact frequency you want, in this case 440 MHz. It works well but just didn’t suit my eye. So after a couple of months, I sprang for the Slim Line also tuned for 440 MHz. I really like this antenna. It, too, works well. What I like is the slim look and the very flexible whip antenna. It looks just right, at least to my eye. I’ve also appreciated Smiley Antenna’s very prompt shipment.

I really like my Icom ID-31A. While I’ve looked at the new ID-51, that’s the dual band version. It doesn’t really appeal to me. Most of the D-Star repeaters are on 440 MHz anyway. As to D-Star, right now I’m listening to the local Fort Worth repeater on reflector 001C with some guys in London and locally talking about D-Star technology. This morning it was Storm Spotting appreciation day with stations checking in from all over the US, Britain, and Belgium. This I like. One more ham radio adventure. I hope you have your own adventures going on. Comments welcome.

 

4 Comments
Categories : Antennas, D-Star
Tags : Antenna, D-Star
surge-protection

Surge Arrestor

Posted by Jim Wilson 
· Saturday, September 22nd, 2012 
· No Comments

You’ll recall that a couple of months ago I’d updated the coaxial feedline to my HF2V. In that process I’d removed the simple lightning arrestor from the base of the antenna, resolving to add a surge arrestor at a later date. Well today was the day.

I purchased two Array Solutions AS-303U surge arrestors along with the bracket that can hold up to four. I also purchased an eight-foot, 5/8 inch, ground rod. The surprise of the installation was how easy it was to get the ground rod into the clay soil. When I last installed a ground rod, at the base of the HF2V, I dug a huge hole. It was roughly 4 feet deep to also hold the concrete for the base of the antenna. I then proceeded to pound the ground rod in the next four feet. What a difficult effort accompanied by a fair amount of swearing. This time I found an online recommendation to dig a small hole, fill it with water, and press the ground rod in about an inch, followed by pulling it out, and pressing it in again about an inch. I’ll be darned if I didnt’ get the ground rod in all the way with no problems. I did clamp on vise-grips toward the end of the effort to give me a better handle on the rod. Piece of cake! I will not shy away from this effort in the future.

I’ve taken a few photos of the installation. I also took advantage of the installation to use Scotch 130C rubber splicing tape covered by Scotch 33+ electrical tape. I did this on both my surge arrestor and on the isolation baluns. The installation looks good. I hope I never have to report how it held up to lightning!

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Two surge arrestors from Array Solutions.
Ground rod and bracket for the surge arrestors.
Array Solutions surge arrestors.
Isolation baluns with weather proofing applied.
No Comments
Categories : Antennas, Radio Equipment
Tags : Antenna
QRP-Text-160

NAQP CW August 2012

Posted by Jim Wilson 
· Sunday, August 5th, 2012 
· No Comments

Just completed the North American QSO Party, CW, August 2012 edition. I decided to enter the QRP (5 watts) category this year. I’ve been operating at low power (100 watts) since I installed the 100 watt amplifier in my Elecraft K3. That has been roughly a year now. What I’ve missed about QRP is looking at the scores afterwards and winnowing out the other QRP scores and, on rare, occasions winning some obscure geographical category within the contest. In the Low Power category I end up somewhere in the middle of the pack and am left trying to compare my results with my previous scores. Fun to be sure and helps drive improvement in your station and operating practices but doesn’t provide much perspective on the rest of the competition. Actually, it does a very good job of that — placing me where I belong — in the middle of the pack, if not lower.

QRP, however, can be quite a bit more frustrating than Low Power. At least with Low Power, most of the stations answer my calls and you can get through pile ups a bit better. With QRP you’re lucky if they can hear you at all. Then, when they do, it’s back and forth trying to get the call sign correct and the exchange. Thanks so much to some great operators who really work to dig out your signal from noise (QRN) and station interference (QRM).

Given all that, my overall score wasn’t too bad. You can see nearby that I had 197 QSO’s for just over 15,000 points. If I’m reading the logging software correctly it appears that I worked 43 states. I usually try to erect a temporary antenna to help with the contest. Usually, that has been my Moxon beam on 15 meters. However, my Texas location with this USA contest means I need to work in all directions save south. So my existing verticals work well for the contest. However, I felt that an 80 meter dipole might help the effort with some higher angle radiation to snag the closer stations. It worked pretty well and lowered the noise level on 80 as well. It didn’t really work on 160 meters. Plus, operating QRP on 160 is only for the brave.

I also ran this year as part of the DFW Contest Group’s QRP Team, called the Nachos. We actually had 6 group members sign up for QRP entries, but only five to a team. It will be interesting to see how the team fares in the competion. This is a new experience for me.

Next steps for improvement are to do some fine tuning on the resonance of the 80 meter dipole for next time. I also need to consider whether I should enter some of the DX contests in the QRP category. Hope to hear you on the air!

No Comments
Categories : Antennas, CW, QRP, Radio Contesting
Tags : Antenna, Contest, QRP
K5ND Moxon Beam

Moxon Video

Posted by Jim Wilson 
· Saturday, July 21st, 2012 
· No Comments

I was pleased to see my K5ND Station Tour video play on Ham Nation in June. This time I’ve created a video on my 15 meter, two-element, Moxon beam. The Moxon has been a popular posting on my blog and it is one area of the station that I built myself from plans published in the May 2003 issue of QST Magazine. Written by KG4JJH with additional detailed drawings, the beam has worked flawlessly since the first time I put it up. It also helped me breakthrough in working Europe and Asia in contests using QRP power levels.

For this video, I added a CAD U1 USB microphone to record the voiceover. I found this to be a marked improvement over using the internal iMac microphone. For editing I again used iMovie. With this video I used all still images and the Ken Burns effect to provide some motion. My current video camera is not HD and I felt that the video in the Station Tour looked pretty rough compared to the still images. This microphone will really come in handy when I record some more podcasts. BTW, I’ve found a couple of P.G. Wodehouse short stories that will work perfectly for my next podcast. Stand by.

I’ve posted the video on a page on this site titled Moxon Beam. Check it out.

No Comments
Categories : Antennas, Video
Tags : Antenna, Moxon, Podcast
IARU-HF

IARU 2012

Posted by Jim Wilson 
· Sunday, July 15th, 2012 
· 2 Comments

I was really looking forward to this contest, which is one of my favorites. Just 24 hours and usually at a time of year that doesn’t pull me in a lot of different directions. I prepared by testing the new push-up mast and trying the vee beam and Moxon. The Moxon won out and did great work during the contest. This was a low power, all-band, CW only operation. I considered QRP, but I’m beginning to feel that the international contests are best entered at low power, with the domestic contests better at QRP power.

A CME Flare from the sun hit the earth about 4 to 6 hours into the contest, which shut down some of the activity. There were times on Saturday evening that it seemed like the North American QSO Party as no other countries were heard. None the less, at other times I did find a number of countries that I hadn’t yet worked on 80, 40, and 20 meters. Also found Saudi Arabia for a brand new country on any band.

I had hoped to break 500 QSO’s at least but only got into the low 300′s, up a bit from last year’s contest. Allergies hit me with a vengeance and really tired me out. So I was only at the controls for around 17 hours and then it was all methodical, somewhat slow, search and pounce, with one run producing a grand total of 3 QSO’s. I’m hoping to do SO2V for the next contest as I will be installing the second receiver in the K3 in the next month. That looks like an interesting project. From looking at the manual it appears more complex than I was considering.

When taking down the Moxon, I broke one of the fishing poles. So now I need to determine how best to repair or replace. I’d been looking at a Spiderbeam or a Hex Beam. Not sure the pocketbook can afford that expense this year. So I’d better be looking for a new fishing pole!

I hope you had a great time working the IARU HF Championship.

2 Comments
Categories : Antennas, CW, Radio Contesting
Tags : Antenna, Contest, CW, Moxon
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