The Great Antenna Shoot Out of 2014

The Big SAL has been up and running for over a month now, and all is well. The wind hasn’t taken it down, and I’ve peaked and tweaked it to get as much performance out of it as I can. But was it worth it? Can it hear things that the other antennas can’t? With that question in mind, I have put together a few comparisons of the SAL and my other two antennas on different frequencies and under different conditions. The results are dramatic to say the least.

First, a brief description of our contenders:

It doesn't get any simpler than this.
It doesn’t get any simpler than this.

The Longwire. This antenna is about as basic as it gets. It’s a sloping longwire going from a ground rod up into a nearby walnut tree. It’s about 65′ long, slopes at about a 30 degree angle, and is about 30′ at it’s highest point. There’s no balun, just a direct solder into a SO-239 connector. It shouldn’t work as well as it should, but all in all its a pretty nice antenna. The antenna runs from North to South.

The Pixel Technologies Pro-1B

The Pixel Technologies Pro-1B. This would’ve been a godsend when I lived in Baltimore, and spent most of my time fighting the leaky transformers and transmission lines that ran down my back alley. Since it receives off of the ends, it spends most of its time oriented North and South, but it can be rotated.

You can read more about the loop, and see some of the shaky cell phone demo videos in a previous blog post.

The SAL on construction day.

The Shared Apex Loop array (SAL 20). The latest tool in my listening arsenal, and the one I’m sure my readers are about sick of hearing about. Hey, what’s not to love though? This is easily the most directional of the three antennas I have, allowing me to choose incoming signals from any of eight points on the compass. With the additional computer interface, I can also steer this antenna with a couple clicks of a mouse, making it about ideal for remote listening.

Each of these three antennas is connected to a four port Alpha Delta antenna switch, which feeds into another four port Alpha Delta switch that allows me to select one of four different radios. Only the Perseus was used in this case.

With all this in mind, let’s see if the SAL can earn its keep so to speak, or if I would’ve been better off spending my hard earned money on a dummy load and a keg of beer.

Comparison 1: Radio Vanuatu, October 29, 2014. Approx. 1230 UTC.

This video is pretty much a slam dunk for the SAL-20. It takes a signal that neither the magnetic loop or the longwire could really hear and makes it intelligible.

While I could tell something was there with the other antennas, the SAL was the only one to recover any listenable audio.

Comparison 2: VL8A, November 5, 2014. Approximately 1230 UTC

Radio Australia (VL8A out of Alice Springs) on 4835 isn’t a very difficult catch, it is very difficult to get an intelligible audio before WWCR’s sign off at 1300. Their transmission on 4840 usually overwhelms the Aussies. note the really narrow passband on the Perseus.

Comparison 3: 1030 kHz, mediumwave. November 6th, 2014. Approximately 0300 UTC.

This is another case of seeing how each antenna handles co-channel interference. In this case, it’s the 50,000 watt WHO radio on 1040, located about 40 miles to the Southeast of my location.

Comparison 4: WPSO, October 7, 2014. Approximately 0230 UTC

Not much of a comparison really, but interesting nonetheless. All three antennas had a loud copy on ESPN Radio out of Indianapolis on 1500, but I could hear something else underneath it on some of the deeper fades. When I pointed the SAL to the Southeast, I heard Greek music. After some digging around, it turned out to be 250 watt WPSO out of Port Richey, FL. The music matched up with their web stream, so no doubt about this one. No video, but I do have some audio:

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Some Final Observations

Obviously the SAL-20 is a beast, and I’m happy to have one at my disposal. Its performance and relatively compact size make it a no brainer for guys like me who do not have the real estate for a Beverage wire. No, it is not a cheap antenna, but what in this hobby is? Getting the last 10% of performance out of any hobby will cost you, and this is definitely an antenna that gets you into that last 10%. Is it better than a Beverage? No, probably not, but that would be a really interesting comparison.

There’s an old adage in the ham community that says more receive antennas are better than less, and I would agree with that. Each of these antennas has a role to play at my listening post, and each can excel under different conditions. One example of this was Dr. Benway’s recent Undercover Radio transmission on 1720. While I don’t have any audio or video of this, I found the magnetic loop to be the best performer of the three. It gave me just a little more signal strength than the SAL in a situation where I really needed it, and the longwire didn’t hear much of anything.

So yes, the SAL definitely earns its keep and then some. I’m glad I have my other antennas to fall back on, but the SAL will definitely be doing most of the heavy lifting from here on out.

I highly recommend this antenna.

First Impressions: Pixel Pro-1B Magnetic Loop Antenna

rotate-loopIt’s been a pretty busy week or two at the QTH. Between the big photo shoot (more pics to come, I promise!), post-production work, a class reunion, and Stanley Cup hockey, I haven’t had nearly as much time in front of the radios as I would have liked. That changed a little yesterday though when the FedEx man dropped off my new antenna: a Pro-1B magnetic loop antenna from Pixel Technologies.

If you’re unfamiliar with magnetic loops and how they work, check out this video from Pixel technologies on how they work, and why you might want one if you live in a noisy urban environment. I am fortunate though in that I live in a small town, and don’t have a lot of noise sources to contend with. For me, the big attraction is directionality. With a cheap TV antenna rotor, I have a rotatable, bi-directional antenna that requires very little in the way of a footprint or or support. In my case, this antenna is basically mounted to the corner of a chain link fence about 10 feet off of the ground. No guy wires needed, just some pipe clamps and a few cable ties.

I’ve only had a chance to play with this antenna for a couple of hours, but so far I am very impressed, and somewhat surprised by the results. I was not expecting the signals to be as strong as they are using this loop. in fact, the signal level is almost identical when compared to my long wire. I was also somewhat concerned by the antenna’s proximity to the chain link fence, and whether or not it would adversely affect the directional performance of the loop. I’m happy to report that is not the case at all. While I suppose performance could be even better if it was in a more isolated location, this antenna is capable of reducing the signal of WHO, my local 50 KW flame thrower,  by about 30 dB. Other experiments, which I tried to commit to video, show how this antenna can be used to null out a local ‘graveyard’ station KASI on 1430, reduce the signal of Radio Nacional da Amazonia on 11780, or separate Cuba from Radio Australia on 6150.

All in all, I’d say this antenna has made a heck of a first impression. It not only holds its own on signal strength with my long wire, it gives me an element of directionality I didn’t have before. All in all, I’m looking forward to having this antenna in my DXing arsenal.