Thursday, August 27, 2015

Free Book Download from Sparks 31

I've been following Sparks 31's blog for awhile now, and bought his book Communications for 3%ers and Survivalists. He's decided to make the full text of that book and his other tome, The Modern Survivalist available as one PDF, for free.

It's worth a gander.

Thursday, August 13, 2015

AlexLoop Walkham Antenna

One type of antenna I've wanted to try for HF has been a magnetic loop or magloop, for short. For portable operations they have a few advantages: small size, light weight, and fast setup and takedown. The disadvantages of small, non-resonant magloops include lack of efficiency and very narrow bandwidth (although the latter can be advantageous in certain circumstances).

In particular, one that gets almost universally excellent reviews is the AlexLoop Walkham by PY1AHD. It's a QRP antenna limited to 10W PEP but for use with my Yaesu FT-817ND that's not an issue. (The FT-817ND's max output is 5W.)

I was down in Delaware for work today at a site about mile from the New Castle, DE Ham Radio Outlet, who carries the AlexLoop. One came home with me. After work I set it up out back on my patio.

I had it sitting on the same camera tripod I used with my Arrow 2M yagi antenna.

Close up of the control box:

You use the knob on the bottom to tune it. The way I did so was to tune for maximum noise. Because it is very narrow banded, if you change frequency even a few kHz, you must retune.

Although it says right there on the box that you should have an SWR meter inline, dummy me forgot to get a BNC-to-UHF adapter so that I could do so. Instead, I configured the FT-817ND to display rough SWR readings on transmit, which allowed me to fine tune the antenna.

So how's it work? I'd say it's promising. On 20M PSK31, here are the signals I received in a couple hours that Fldigi reported to I saw more than these on the waterfall, however.

And here's what I received.

Not shown were the several European stations I saw on the waterfall, including Spain, Italy, Serbia, Slovakia, Bulgaria, and Poland.

I completed two QSOs, one with a ham in MO about 815 miles away, and another with an operator in Italy, 4348 miles away. For whatever reason, he didn't show up as receiving me on

I also tried 40M for a few minutes but the band was dead.

The AlexLoop should be a good choice for portable operation, especially when camping. It collapses down into a small, light package, and came with a nice carrying bag. Setup is easy and quick, and unlike my portable vertical, it doesn't require any counterpoises to be laid out and gathered up. It wasn't cheap, but it's well made and should last a long time.

If you're looking for a portable antenna for QRP HF, the AlexLoop Walkham is worthy of consideration.

Tuesday, July 28, 2015

E-Book: Practical Antenna Design 140-150 MHz VHF Transceivers

Thanks to Fo Time on Facebook, I ran across this e-book on antenna construction, Practical Antenna Design 140-150 MHz VHF Transceivers, by Elipidio Latorilla. Included are a couple variations on the familiar VHF ground plane, but the details look like these would be easier to construct than most such designs.

This book is worth adding to your library.

Tuesday, July 21, 2015

Gun Training in Nasty Weather

Over on, Dave Morelli has an article in which he advocates gun training in bad weather.

I see nothing in the article with which I disagree. The author isn't advocating going out in crappy weather to learn the fundamentals. He's telling you to get out there in sub-optimal conditions to learn what your gun does -- and what you do -- when it's windy, rainy, or cold.

Based on my own experience in shooting practical rifle matches at my club, operating your gun in extreme weather conditions stresses the shooter in ways not experienced when it's 75 and sunny. If it's humid, lenses (both eye glasses and scope lenses when you accidentally breathe on them) get fogged. If it's snowing ice can form on your gun while you're waiting to shoot, rendering it slippery. When it's hot, your sweat gets in your eyes and on the gun.

Or step in a 10" deep puddle of ice water while your waterproof boots are only 8" high, then go on to finish the stage.

In cold weather your clothing limits your movement and makes working fine controls more difficult.

Get the basics down in good weather. Then go see what happens when it's shitty out.

It was about 12 degrees out when this pic of me was taken back in January.

Under stress you will default to the level of your training. If you train easy, you will fail get life gets hard.

Monday, July 20, 2015

Got Comms?

Sparks has recently posted  about Internet service interruptions, some of which are the result of intentional action. See this post, too (and my readers may recognize the picture of the FT-817).

Today, I ran across this story on Ars Technica, reporting a fiber optic cut near San Francisco which was the twelfth such interruption in that area this year.

A sufficiently motivated party could cut several such fiber optic lines, or take out a colo facility in which many such lines pass through, and thereby cut off comms for a large number of people for a significant period. Given our current dependence on the Internet and telecommunications, this could be disastrous for those affected.

BTW, from the viewpoint of someone who's worked for an ISP for nearly 15 years, if somebody takes out a colo facility, Shit Just Got Real.

The Internet was designed to route around breaks but as it has grown in the past 15 years, the level of overall redundancy has dropped in many areas. Too many parts of the infrastructure are vulnerable to intentional disruption. With Islamic terrorism happening more frequently on US soil, I am concerned that at some point they'll go for infrastructure.

This is why I highly recommend getting at least a General Class amateur radio license. The General Class license gives you operating privileges on most of the frequencies allocated to ham radio operators in the US, and isn't much more difficult to get than the entry level Technician license, now that there is no Morse Code requirement.

There's a lot of overlap in the Tech and General exams, but you get a lot more privileges on High Frequency (HF) with the General ticket. HF is what's needed for long distance communications, or certain kinds of regional comms (see, NVIS).

The ARRL maintains a web page with info on getting licensed, including training and finding an exam, here.

You need to get licensed now, before you need comms, because you need to know how to operate your radio, and understand on-the-air procedure. You cannot expect to be able to turn on a ham radio, press a button, and talk to someone like you're using walkie talkies. Just like having an AR-15 doesn't make you a Navy SEAL, having a radio doesn't make you a competent operator. It takes practice, and the only way to get it is to get on the air.

If you're not licensed, don't expect to be able to get on the air with a fake call sign. Not only will licensed hams not talk to you, they may very well track you down and sick the FCC on you. The penalties for unauthorized transmissions can include $10,000 fines.

It's not a bad idea to have unlicensed communications options available, as well. FRS and GMRS* are good for local comms, as is CB Radio. See Dialtone's posts on the "Jungle Telegraph," here and here.

* I know, GMRS requires a license. However, I'll bet that 90% or more of bubble pack FRS/GMRS radios are operated without one.

The Revenant

Over on Arfcom one of the members started a thread about the upcoming Leonardo DiCaprio film, The Revenant, coming out this December. Here's the trailer:

The movie is based on the story of real-life mountain man Hugh Glass, who was mauled by a grizzly bear, was left for dead without a gun or even a knife, and then crawled 200 miles to the nearest white outpost, making Glass' tale one of the most amazing and enduring survival stories ever.

Glass' saga was also told in the novel Lord Grizzly, which I read years ago. It was a best seller when released in 1954, and is a classic. I decided it would be worth rereading, so I bought a new copy to read on Kindle.

Saturday, July 18, 2015

Programming the Uniden BC996XT Trunk Tracker IV Scanner

This morning, I've been working on getting my new Uniden BC396XT programmed to search frequencies in my country, the surrounding counties, and a few nationwide radio services like CB, FRS/GMRS, and NOAA weather. To start out with, I am using FreeSCAN, which is very full featured and of course, free.

I've also downloaded the demo of  ProScan, which has a 30 day demo.

Both ProScan and FreeSCAN feature rig control, which given the highly menu-driven UI of the Uniden scanner, is nice to use if you have a PC handy. Unfortunately, both are Windows-only.

Compared with programming an amateur radio, as a scanner n00b this is more complicated, which came as a bit of a surprise. Part of it is the new interface but aside from that, there are a lot of frequencies to monitor and organizing them is a challenge.

Uniden includes an RS-232 serial cable for programming the unit. C'mon guys, it's 2015. How about a USB programming cable? Yes, Uniden sells one, but it's about $50 after shipping. (There are clones out there on Amazon and eBay, but I have no idea if they are any good or not.)

For several years, most computers haven't come with serial ports, so you'll probably need a USB-to-Serial adapter if you want to use the supplied cable. I already have a Keyspan USA-19HS USB-to-Serial adapter, which I've found to be one of the more trouble free such units when working with things like network routers and switches. It works with Windows, Mac, or Linux computers. Amazon has a less expensive TRENDnet alternative.

If you're serious about scanning, then a Premium subscription to Radio Reference is a must. Having the Premium membership allows you to enter your credentials into your programming software and have it download groups of frequencies into your local database, then upload them to the scanner. Given the number of frequencies you'll want to monitor, this is necessary so you don't have to spend days manually entering the info.

Note that to programm the CB, FRS/GMRS, and MURS frequencies, you need to use FreeSCAN's EZGrab function, that lets you copy a table from a web page and paste it into the program. Radio Reference doesn't have these frequencies in their database to download. It would be nice if FreeSCAN could have these as a menu item, similar to what is found in CHIRP, which a lot of us hams use for programming amateur radios.

Another valuable resource is the Easier to Read Manual from Mark's Scanners page. I may buy a hard copy from Scanner Master.