Pneumatic Telescopic Antenna Masts
PMM Telescopic Masts with pressurized air elevation 9m/10m
Fast raising and lowering, comfortable Masts for antennas and other payloads (e.g. Floodlights, Cameras, Anemometer, Microphones etc.).
These masts are made of concentric sections of anodized aluminium, equipped with a lock against rotation. The top section is terminated with a large flange which allows installation of various payloads. The fucntional principle is the reverse of an air pump for your bicycle: if you put pressurised air into the nozzle of the pump, the handle extends due to the internal pressure.
The compressor required to extend the mast is not included in shipment; but you can use any other existing compressor our source of pressurized air as well (e.g. the pressurized air of a truck brake).
The mast is operated (extended or lowered) by a three-position valve: Raise/Hold/Lower.
When one section of the mast is fully extended it locks into the next section. This locking ensures that the mast is held extended even when the pressurised air is removed. The mast can even be locked in different heights by not extending all sections. To lower the mast just pull the release handle on the lowest section, the uppersections will lower themselves gently. Then pull the handle of the next section ow in reach, lower this, and so on...
For installation on level surfaces the mast comes equipped with a solid tripod. This tripod allows adjustments for slopes with some inclination. This tripod must be fixed to ground, even for masts marked as "self supporting, no guying required". Alternatively mast clamps for installation on a wall or vehicle are available.
We offer three different models.
PMM 9/2.8 is intended at stationary deployment for operation with guying. Maximum allowable wind load can not be specified because it depends on the guying. It is also possible to operate the mast self-supporting, however maximum top load and antenna surface are not specified.
PMM 6/2.3 can be operated guyed or self-supporting, but a static calculation is not available. PMM 10/2.9 can be used as a reference point - pipe diameter of the top three pipes are identical.
Static calculations for wind zones 1 and 3 are available for the PMM 10/2.9, see below.
The table details the PMM 10/2.9 apply for free-standing operation, with the mast with the antenna surface and 120km/h calculated approximately 66cm bends. Therefore it is recommended also to guy the mast, and of course the antenna surface can be enlarged when operating with guying wires. When the center of the antenna surface is in the amount of the guying point so that no torque is exerted by the wind, the maximum antenna surface would be theoretically infinite. But please do not overload, because the mast otherwise be bulgy and can break, especially when the bias of the guying wires are to strong. Because the force applied by the guying tension is indeed in relation to the tension angle as a compressive force in the mast!
|PMM 10/2.9||PMM 9/2.8||PMM 6/2.3|
|self supporting||with guying||both|
|Payload weight max.||100||30||50||Kg|
Max. Antenna surface
1.18 @ 90km/h
0.53 @ 120km/h
|see text||see text||m²|
|Number of sections||5||5||3|
|Diameter lowermost tube||160||98||118||mm|
|Diameter uppermost tube||82||36||82||mm|
|Length of tripod beam (Radius)||ca. 152||ca. 152||ca. 152||cm|
These masts can also be customized for other lengths and paylod weights. Give us a call.
|38300||PMM 10/2.9 Pneumatic telescope mast 10m||Add to shopping cart||In stock, shipped in 4 to 5 days. ⓘ|
|38310||PMM 9/2.8 Pneumatic telescope mast 9m||Add to shopping cart||Ordered only on customer request, down payment required, delay at c. 90 days. ⓘ|
|38320||PMM 6/2.3 Pneumatic telescope mast 6m||Add to shopping cart||In stock, shipped in 4 to 5 days. ⓘ|
|Info freight charges|
Structural analysis for 38300, unguyed, 90 km/h max. wind (PDF,EN 160kB)
Structural analysis for 38300, unguyed, 120 km/h max. wind (PDF,EN 160kB)
Top flange dimension (PDF, 14kB)
Assembly draft 38300 (PDF, 29kB)
Assembly draft 38320 (PDF, 14kB)
The upper flange of the PMM 10/2.9 and PMM 6/2.3 has 4 fastening bores, to mount the YAESU-Rotatores G-450 to G-2800DXC direct.
Video of Pneumatic Mast
Here is a short video of our first test of this mast. The commentary is in German, and the overall quality definetely on a 'hobbyist' level :-) But still it gives a good impression of these fine masts.
Accessories for pneumatic mast
Useful accessories for the construction of the pneumatic mast.
Wall mount for PMM 10/2.9. Needed to be bolted to the outer mast shot, for example on a garage wall.
|38300.W||Wall mount for PMM 10/2.9||Add to shopping cart||Ordered only on customer request, delay at c. 90 days. ⓘ|
|Info freight charges|
This ring can be used to incorporate the PMM 10/2.9 in a floor slab or in a car roof.
|38300.RING||Mounting ring for PMM 10/2.9||Add to shopping cart||In stock, shipped in 4 to 5 days. ⓘ|
|Info freight charges|