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PT Telescopic Mast Range

The Clark Masts model PT 1 is the original Clark Mast. Since 1957, not only have other families of mast evolved, but the PT Series itself has expanded until today there is a range of standard models.

Configurations

Photo: PT MastOriginally made for field strength measurement in the early days of television, the PT Series mast has since found many other applications. There are two usual configurations. The first is when the mast is mounted on a vehicle. The mast is extended by a compressor, powered by the vehicle battery. This is ideal for a radio reporting car, as the photograph shows.

The second configuration is when the mast, equipped with legs and guys, is extended by means of a handpump and can be set up in the field. All masts operate at a maximum air pressure of 1.5 kg/cm2 (21 lbs/in2g). Clamp collars for applications demanding semi-permanent extension.

Construction

Sound construction is a feature of Clark Masts, a tradition which started with the PT1. There is always generous overlap between extended sections. Clark Masts have a reputation of quality to maintain and this is to our Users advantage. Interchangeability is a constant feature. That means seals and pistons are improved but interchangeable, regardless of age.

Frangible nylon keys protect tube sections from accidental damage. Adjustable nylon guide pads maintain smooth operation in dusty desert conditions. These, and many other features, make the PT Series an absolutely reliable device.

Inside PT Mast Details

Image: Inside PT Mast DetailsProduct details

  1. Large handles for easy section clamping.
  2. Adjustable bearing screws, nylon pads.
  3. Easily replaced frangible key protecting mast keyway.
  4. Collet ring solidly locks sections on full extension.
  5. Water drain - holes.
  6. Machined keyway aligning telescoping sections.
  7. High tensile corrosion resistant aluminium alloy anodised finish.
  8. Air inlet.
  9. Location of optional mast extension warning switch (Works fitted only).
  10. Powerful low-friction antenna clamp.
  11. Rubber ring weathering joint between collars.
  12. New powerful totally enclosed telescopic section clamping system.
  13. New double "Supertork" notches locking sections in torsion when mast is fully extended.
  14. Exclusive moulded low-leak rubber seals.
  15. Teflon bearing rings on each piston.
  16. Combined pressure relief and condensate drain valve.

Choose the best PT Mast for your purpose

Mast Model PT 1 PT 3 PT 4 PT 5 PT 6
With plain collars Cat. No. 15076 15077 15094 15130 15078
Retracted height (mm) 2138 3965 2720 2050 3960
With clamp collars Cat. No. 15082 15083 15100 15136 15084
Retracted height (mm) 2258 4085 2820 2110 4080
Extended height (m) 10.6 18.3 12.3 6.1 21.0
Diameter of top section mm (inches) 38.1
(1 ½")		 38.1
(1 ½")		 50.8 (2") 76.2
(3")		 38.1
(1 ½")
Diameter of bottom section mm (inches) 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½")
Weight of mast unit (approx.) 33 kg 75 kg 42 kg 24 kg 68 kg
No. of sections 7 7 6 4 7
Maximum headload 15 kg 10 kg 20 kg 30 kg 8 kg
Antenna socket size Ø (mm) 24 24 24 40 24

Mast Model PT 8 PT 9 PT 11 PT 12 PT 13
With plain collars Cat. No. 15095 15079 15096 15131 15112
Retracted height (mm) 3330 1820 2260 1450 4825
With clamp collars Cat. No. 15101 15085 15102 15137 15118
Retracted height (mm) 3430 1940 2360 1510 4905
Extended height (m) 15.3 9.0 10.0 4.1 18.3
Diameter of top section mm (inches) 50.8 (2") 38.1
(1 ½")		 50.8 (2") 76.2
(3")		 63.5
(2 ½")
Diameter of bottom section mm (inches) 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½")
Weight of mast unit (approx.) 53 kg 27 kg 32 kg 18 kg 64 kg
No. of sections 6 7 6 4 5
Maximum headload 15 kg 12 kg 20 kg 36 kg 20 kg
Antenna socket size Ø (mm) 24 24 24 40 40

Mast Model PT 14 PT 15 PT 16 PT 17 PT 34
With plain collars Cat. No. 15097 15113 15098 15235 15114
Retracted height (mm) 1780 1475 1550 1825 1800
With clamp collars Cat. No. 15103 15119 15104 15241 15120
Retracted height (mm) 1880 1555 1650 1965 1880
Extended height (m) 7.5 5.0 6.0 10.0 6.7
Diameter of top section mm (inches) 50.8 (2") 63.5
(2 ½")		 50.8 (2") 25.4
(1")		 63.5
(2 ½")
Diameter of bottom section mm (inches) 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½") 114.3 (4 ½")
Weight of mast unit (approx.) 28 kg 20 kg 26 kg 35 kg 26 kg
No. of sections 6 5 6 8 5
Maximum headload 20 kg 30 kg 20 kg 9 kg 25 kg
Antenna socket size Ø (mm) 24 40 24 20 40

Mast Model PT 54
With plain collars Cat. No. 15080
Retracted height (mm) 1485
With clamp collars Cat. No. 15086
Retracted height (mm) 1605
Extended height (m) 6.7
Diameter of top section mm (inches) 38.1 (1 ½")
Diameter of bottom section mm (inches) 114.3 (4 ½")
Weight of mast unit (approx.) 23 kg
No. of sections 7
Maximum headload 9 kg
Antenna socket size Ø (mm) 24

Some of the PT Accessories

It would be impossible to show here all the accessories which are in steady production for the PT Series. These are shown on the PT Data sheets, copies of which are available on request. Here we show the normal accessories for internal and external vehicle mounting. Others available include mounting rings and brackets of many kinds, compressors and control valves, roof trollies, in fact everything necessary for a reliable installation.

Image: Roof bearing - Cat. No. 14048Roof bearing - Cat. No. 14048
This unit seals the roof skin if a mast is mounted in a vehicle internally but still allowing the mast to be turned freely.

Image: Upper mounting bracket - Cat. No. 14049Upper mounting bracket - Cat. No. 14049
This is a bracket which can support the top end of the mast base tube when a mast is mounted externally. It is equipped with a teflon bearing which insulates the mast as well as permitting rotation.

Image: Lower mounting bracket - Cat. No. 14050Lower mounting bracket - Cat. No. 14050
This bracket is the complement of the above and can support the bottom of the PT mast.