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StackMatch - For three antennas, 3 kW, SO-239 connectors
SKU Part Number:
AS-STACKMATCH3-CONFIG
CHOOSE AN OPTION FROM THE DROP DOWN MENU ABOVESTACK MATCH - NO CONTROLLERSTACK MATCH ROTARY CONTROLLERSTACK MATCH WITH PUSH BUTTON CONTROLLER
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£299.95
£249.96
Availability: In stock
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CHOOSE AN OPTION FROM THE DROP DOWN MENU ABOVE
STACK MATCH - NO CONTROLLER
STACK MATCH ROTARY CONTROLLER
STACK MATCH WITH PUSH BUTTON CONTROLLER
Stack of three Antennas Combining System. Allows any of the seven combinations for 1, 2 or 3 antennas, vertically shaping the radiation lobes and changing the radiation take-off angle to optimize the signals depending on the varying ionospheric propagation angles. 7 to 30 MHz. 3 kW. SO-239 connectors. Requires a controller fed with 12 V DC 1A.
Pattern comparison of a stack of three five element 20 m Yagi-Uda antennas at different heights: 15 m (50 ft) high (blue), 30 m (100 ft) high (red) and 45 m (150 ft) high (black).
When the antenna at the 15 m (50 ft) level is used, there is a main lobe centered around 18 degrees and a deep null at 45 degrees elevation above the horizon.
When the antenna at the 30 m (100 ft) level is used, there are two main lobes, at 10 and 32 degrees and deep nulls near 20 degrees and 45 degrees of elevation above the horizon.
When the antenna at the 45 m (150 ft) level is used, there are three main lobes at 7, 21 and 36 degrees and deep nulls at 14, 28 and 46 degrees.
This shows that one antenna at one height will not cover all the incoming angles that vary through the day depending on the ionospheric propagation conditions.
Now, let's explore the combinations of selecting two antennas in phase out of a stack of three and also when the three antennas are selected at the same time.
There are four possible combinations when using more than one antenna at the time:
-All three antennnas at the same time (black). Single Lobe at 8 degrees. Providing the maximum gain the stack can deliver.
-The two at the top (green). Lobes at 7 and 23 degrees, null at 17 degrees.
-The two at the bottom (red). Main lobe at 12 degrees.
-The top antenna and the bottom antenna (blue). Lobes at 8 and 34 degrees. Nulls at 16 and 46 degrees.
The use of the StackMatch to combine the antennas in phase delivers more gain, up to 5 dB over a single antenna when three are used and 3 dB in the case of two antennas compared to a single one. But even more important is the coverage of the angles with the resultant lobes obtained with seven different combinations; the four listed above and the three possibilities when using one of the three antennas.
Low angle lobes are good for long-haul contacts specially at dusk and down while high angle lobes are better near local noon along the propagation path.
For this and more information on the StackMatch products click here
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If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:
Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request.
Warranty Terms and Conditions
Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.
For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.
International Warranty information
Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]