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Old 26-Oct-2018, 2:07 AM   #1
maypo
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Join Date: Mar 2017
Location: WNY
Posts: 7
Mounting my db8

Approximately 8+ft above my roof is my very old Radio Shack antenna and a very old RS rotator.(tripod, riser mast,rotator and mast) I just bought an antennas direct DB8 and the mast mounted above the rotator is not long enough for mounting the DB8.
I would like to get the DB8 up higher if possible and wondering just how much higher would be a safe bet. i will replace the upper mast with a longer one and move up in diameter a bit too. How much is too much...
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Old 26-Oct-2018, 2:12 PM   #2
JoeAZ
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Join Date: Mar 2017
Posts: 277
Greetings Maypo,
I assume you have removed the old antenna. The DB8 is a fairly large
antenna, with significant loading and as such, I would not go beyond
5 feet for the mast above the rotor. With the wind, Ice and snow you
can expect, I would say that 5 feet is a safe bet. You best and most
difficult way to increase height would be to extend the mast BELOW
the rotor. Then, guy wires would be necessary.
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Old 26-Oct-2018, 2:20 PM   #3
ADTech
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Check the rotor's specifications for the maximum length of the stub mast. Light-duty rotors will severely restrict the length of that mast so as to limit the lateral loading on the bearings of the output shaft. If you can, use a thrust bearing to maximize the durability of the rotor unless you have one that's beefy such as an amateur radio model. If your rotor is an inexpensive one, keep the stub mast as short as you can while still mounting the DB8 so it clears the rotor and any guy wires.
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Old 26-Oct-2018, 3:13 PM   #4
maypo
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Join Date: Mar 2017
Location: WNY
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Is the wind load on this really more than my old type really long double beam?
Thanks to all for the info.
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Old 26-Oct-2018, 6:57 PM   #5
rickbb
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Join Date: Dec 2014
Posts: 279
Yes it's more, how much I don't really know. But the older beam styles were flat and thin as far as wind goes, the bow tie styles, (like the DB8), are like a sail on a boat sticking up against the wind.
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Old 4-Nov-2018, 3:45 PM   #6
maypo
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Join Date: Mar 2017
Location: WNY
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It mostly open fine wire grid work unlike a sail but ill take your word for it.
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