The Wizard, first impressions
A sample of the intriguing but controversial Wizard antenna arrived yesterday morning and I was able to do some testing before hitting the road for Fort Lauderdale. If I had to put the results in three words they’d be: disappointing but tentative. Before the details, check out the bigger image , which goes along with a more concrete description (that came with the sample) of the marine Wizard’s purported capabilities. That RG-58 cable with a BNC connector coming out of the left side will support a 25 watt VHF radio while the two RG 174U cables on the right (one BNC and one SMA) can purportedly handle AM/FM, WiFi, GPS, Cellular, Sat phones, and UHF/VHF, all transmissions limited to 5 watts. The various added connectors and patch cables are what I had to do to hook the Wizard to VHF and Class B AIS, and the unfortunate lash up at bottom right is one of the reasons I say “tentative.”
* 25 watt VHF: Using the Lowrance LVR-880, I did A/B/C tests with an 8’ 6dB Glomex stick mounted about 30’ over the test area, a Shakespeare 3’ 3dB stainless whip mounted near the radio, and the Wizard (also nearby). The number and quality of WX stations received were in that same order, though there wasn’t a startling difference from Glomex to Wizard. Ditto for a brief transmission test I did with “Sparky”, a young radio and harbor enthusiast you’ll hear more about. Sparky and I were about a mile apart, with lots of wet trees and buildings in between; he could detect a slight quality difference as we moved through the antennas, but the Wizard did work.
* Testing the 25 watt line with a Shakespeare ART-3 was more troubling. The Glomex tested at 28 watts with 1.2 VSWR, the Shakespeare at 26 watts with 1.3 VSWR, and the Wizard at 18 watts with 2.9 VSWR. I tried moving the Wizard around (per instructions) but only saw a little variability.
* Class B AIS (GPS and 2w VHF): Using the Digital Yacht AIT250 and ACR Nauticast B transponders, I did A/B tests between the ACR antenna set and the Wizard. Not good. The screen shot below (bigger here) shows about the best GPS reception I got, trying two locations, and the Wizard never generated a fix. By contrast the ACR GPS antenna let the transponders lock on to 7 to 11 satellites. Of course the units wouldn’t transmit without a fix, but they did receive another Class B that was very nearby. Now note that the GPS signal was traveling from the Wizard through that 5 connector misfortune seen above, but it’s continuity check out fine.
* WiFi (and more): I didn’t have the right connectors. Friggin connectors. PL-259, BNC, SMA, RP-SMA, TNC, RP-TNC, N…I saw all those in just the VHF, Class B, and WiFi gear I’d like to connect to the Wizard. And then there’s cell phones and amps. I didn’t have much luck at Radio Shack but have a bunch of adaptors coming from data-alliance and ShowMeCables.
And I have questions to ask at AMT’s FLIBS booth (#805). I was surprised, given the no-line-of-sight claims, that the company recommends installing the Wizard as high and as unobstructed as possible. So why the short cables and lack of mounting system? What’s a Wizard going to cost? And what’s up with the GPS reception?
VSWR of 2.9 in the marine band?? Not so good. That’s a good way to burn up the finals in the radio.
Without amplification built-in for the GPS antenna, and the cable losses at 1.575GHz its amazing that you got any signal. I have had many Garmin handheld units over the years and any of them with an antenna that has a BNC connector if you extend that cable by just a feet it won’t work properly. If you use an amplified antenna on a long cable run it will work fine. Keep in mind that for instance Garmin supplies +5VDC on the antenna output. I am not sure if the antenna is open at DC voltage or shorted to ground, but if the later it will cause the GPS to error as it detects the short.
It would be nice if they publish the center frequencies of each antenna input/output. Without this information I can see a lot of burned up transmitting devices.
Just a gimmick. Would you want to trust this antenna offshore and in an emergency situation? Height is everything in line of sight communications, and with a very ineffective radiator as shown in the VSWR readings its not going to work well.
Thanks,
Chris