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Antenna rotator AR-300 XL review PDF Print E-mail
Antenna rotator AR-300 XL Directional antennas like yagi or quad is requiring an antenna rotator. It's possible to work without it but it's a great disadvantage. Only if you can operate with a few fixed directional antennas and swith them is really to forgot on antennas rotators.

On the market is a cheap TV rotator named AR-300 XL (or similar) which you could obtain around 50 pounds in Radio Shack. What can this rotor do?

Antennas rotator AR-300 XL

Vertical load 45 kg
Power supply 220 – 240 V AC
Power input 37 VA
Cable type 3-core
Maximum load 600 kg/cm
Angle of rotation 360 + 5°
Time for turn around 360° approx. 60 sec
Diameter of support 38 – 50 mm
Diamater of antenna tube 28 – 44 mm
Weight 4,6 kg

First thing in the box is a control device. There is only one rotary element on the fron side. Below him is a indicator of real azimuth. So if you turn left or right rotary element consequently is moving also indicator. When is a mark on rotary element and indicator equal rotator stops. Rotator is scaled in angles with marked main directions (N, E, S, W).

Second thing is straight rotator. It's made from superalloy which is very hard. The junction between fixed and rotary part is covered by gum cover. Last things in the box is bag with screws and U-elements. Additional you must buy a 3-core cable for interconnection between the control device and rotator.

Rotator is based on selsyns. Pricipe is simple: when is turned selsyn transmitter (in control device) is also turned selsyn receiver (in rotator). Selsyns are stopped only if there are synchronized. They are working with 24V voltage. That's a condition for safe use outside the home (in the garden etc).

Gear train the control device is made from plastic material. But gears in the rotator are made from iron. Rotator does not have a brake. All tensions are eliminated by gear train and selsyn. Be careful only for exact axles. If there is some friction in bearings rotator stops. So give your attention for good set up.

Control device is getting hot when is frequently used (in contest or so). Substantial is that I have not detect any interference from rotator on HF and VHF bands. Control device is only a little bit loud (when turn).

Rotator was tesed with few antenna systems. The first one was a 3 element Yagi for 10m band in my garden. Used was a mast with a support bearing. It works witout any troubles nearly two years (during the winter was –25°C) and three stron winds (around 100 – 120 km per hour) causes no problems. Next antenna system consisting from 9el. Yagi for 2m band, four stacked DL7KM antennas for 70cm band and 85cm diameter dish for microwaves on the mast. This was a real proof. The sound of rotator was not obvious but it turns also these antennas. Now we are using AR-300 XL for portable with two stacked DK7ZB yagis for 2m band. Other is used for higher bands.

So I give AR-300L five stars. It's useful to turn most VHF antennas and small-sized HF beams.
 
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ARRL Amateur Radio News
The National Association of Amateur Radio

ARRL Headquarters Closed for Thanksgiving Holidays
ARRL Headquarters will be closed November 27 and 28 in observance of Thanksgiving. There will be no W1AW bulletins or code practice transmissions those days. The ARRL Letter will be published on Wednesday, November 26, but there will be no ARRL Audio News on Friday, November 28. ARRL Headquarters will reopen Monday, December 1 at 8 AM Eastern Standard Time. We wish everyone a safe and bountiful Thanksgiving holiday.

Global Emergency Network Marks Record
The Global ALE High Frequency Network (HFN) -- an international Amateur Radio Service organization of ham operators dedicated to emergency/relief radio communications -- has become the first network to operate continuously for more than 500 days on all international Amateur Radio shortwave bands simultaneously. According to HFN International ALE Coordinator Bonnie Crystal, KQ6XA, the main purpose of the Network is to provide efficient emergency and disaster relief communications to remote areas of the world. "Beginning with a core group of six North American radio operators in June 2007, HFN rapidly expanded to cover large areas of the planet with 24/7 digital communications," she said."HFN was designed to be an open framework for global Amateur Radio emergency services to interoperate on HF using the Automatic Link Establishment (ALE) system." Relying on ionospheric radio communications, interconnected HFN base stations scan the radio bands every 10 seconds, from 3.5 MHz-28.0 MHz. Through this Net, Crystal said, ham operators stay connected with each other at all hours of the day or night in any mode of operation, and can send Internet e-mail or cell phone mobile text messages from the field."

Section Manager Election Results Announced
There were nine Section Manager races this fall, four of which saw no opposition. Election ballots were counted and verified on Tuesday, November 18 at ARRL Headquarters for the remaining five races. Terms of office for these new Section Managers will begin on January 1, 2009.


Make More Miles on VHF
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Updated: 2008-11-19 at 12:27 UTC
More info at www.MMMonVHF.de

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ZD8B
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A selection of circuits, tips, news and humour

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Sun City in South Africa will host the next IARU Region 1 Conference in 2011

European Parliament members get Amateur Radio Year Planner
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Venezuelan Radio Station and an Amateur Radio website
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