Operating Instructions
Introduction

The QT-Series of masts has derived from the original RT Series which was first introduced in 1959. Whilst various design updates have taken place, the basic concept remains.  Its instant user approval following the original launch, and its consequent acceptance worldwide, is a strong recommendation for this essentially lightweight mast. 

The QT-Series has been proved not only in the field of radio communications but also for supporting temporary floodlights, meteorological instruments, survey equipment and microphones. 

Most versatile in its use, the QT mast can be either free standing. by simple connection to a fold-up tripod stand or alternatively it can be vehicle mounted either inside or outside of the vehicle. 

Extension of the mast is to be achieved by means of the standard arrangement of a handpump connected to the base tube. In all cases. mounting and extending a QT mast takes only a few effortless minutes. 

There are eleven models in the present QT-Series offering extended heights of 4 to 15 metres. Each mast is fitted with thumb screw operated clamp collars on each section which enables the mast to remain extended independent of air pressure.

By following carefully the operating and maintenance instructions given in this handbook the user is assured of a long and satisfactory life from each mast.
WARNING
All QT masts are fitted with special high efficiency seals. Only correct silicone grease should be used when lubricating during overhaul.  Under no circumstances use any other oil or grease at any time.
Antenna Mounting
All QT masts are fitted with sockets of 24 mm diameter. Actual dimensions are shown on tie sketch below. Also shown are the recommended dimensions of the matching antenna spigot which eliminates the use of adaptors.
The clamp has been designed to hold the antenna securely when clamped yet instantly release when unclamped.  It holds without shake. It is not possible to turn the QT mast when mounted and fully guyed.  For directional antennas therefore a rotator (Cat. No. 6508) must be fitted to the masthead. Its socket is the same size as the mast socket 24 mm.
Guying the mast
  1. The mast should always be guyed if there is a chance of strong winds or if the headload is near the maximum recommended, weight and surface.
  2. The guys should not be less than 30° to the vertical and 45° maximum.
  3. The pickets must be in firm ground and driven into the ground to sufficient depth (At least 60% of the picket length). In softer ground they should be driven to full length. 
  4. The tension applied to the guys should be the minimum to eliminate slackness only. When the wind blows, the guy on the windward side will automatically have more tension. 
  5. Avoid over-tensioning.
MOUNTING THE MAST
If the mast is being used with a tripod stand, first assemble the stand and attach the mast to it. (photo 1) Also see page here.

If the mast is being supported in some other way such as on a vehicle or structure, secure using the studs fitted to the handpump and the mast base.

Attach antenna or other headload by inserting into mast top socket and tightening clamp knob. (photo 2)
EXTENDING THE MAST
Close the valve in the pump outlet. (photo 3)

Tighten all the clamp collars except the smallest. (photo 4)

Pump up smallest mast section. Tighten its clamp collar and loosen next larger.

Pump up the next sections and repeat the process of unclamping and clamping the collars until the mast is fully extended and clamped.
RETRACTING THE MAST
Loosen the largest clamp collar and open the pump valve. As the mast retracts loosen each clamp collar in turn.When the mast is fully retracted tighten all clamp collars. Leave the pump vaive open.
Maintenance (First Line) 
Attention to the following will ensure that the QT Mast will give long reliable service.
 
  1. CLEANING
    1. Periodically clean the exterior of the mast using a soft dry cloth. In particular wipe clean the outside of the tube sections.
  2. LUBRICATION 
    1. The diagram below shows the main points which require regular attention.  The period between lubricants being applied will vary according to the   type of service.  As a guide however, the pump seal should be re-lubricated with Silicone Grease every ten working hours. All other points should receive attention at least every six months.
    2. Recommended Lubricants:
      1. Oil : Use any clean good quality motor or machine oil. 
      2. Grease: Use any good general purpose grease. 
      3. Silicone Grease: Use only CLARK Ref. No. B3905. 
  3. WARNING
    1. Do not allow mineral oil or grease to contact mast or pump seals as they will be immediately damaged.
IMPORTANT
QT Masts are delivered with the ancillary equipment required to ensure satisfactory performance in all the operational circumstances defined by the purchaser at time of order.

Before using mast with maximum loads, or in conditions of maximum wind, or if mast is to stay erected for long periods, or if mast is to be used for a purpose different from that for which it was supplied, consult first the appropriate QT Masts Data Sheets.
GUARANTEE
All our equipment is unquestionably guaranteed by us to be free from defects in materials, workmanship and function as defined by us when supplied. We therefore undertake to replace or repair as necessary any equipment which proves faulty in any of these respects provided that no modifications have been carried out without our knowledge and consent.  The period of this guarantee is one year from supply.  However, as lt is the policy of this company to maintain a sincere interest in all our equipment for an indefinite period after purchase. our c:ustomer may rest assured of sympathetic attention to all complaints no matter when they occur.

In the event of a claim under guarantee being made we will carry out the work at our Works and will redespatch at our expense, by aur choce of means to any part of the world. Wo shall not be responsible, however, for any labor expended or consequential loss incurred by the customer due to the alleged defect.

Damage to the equipment resulting from inadequate packing for the return journey is not coverec by this Guarantee.

In brief, it is our desire to be of assistance and provide a prompt and cheerful service at all times so that our relationship with our customers shall be happy and
mutually advantageaus.
INSPECTION OF EQUIPMENT ORDERED
All inspection in our Works is to the Standard of AQAP 120. Clark Masts Teksam Certificates of Conformity may normally be issued whenever rquested.

In all cases where customer wishes t0 personally inspect equipment before acceptance, inspection must be carried out at aur Works of manufacture by the  customer or his representalive.
Packing standards may also be inspected at any times
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Stand : Mai 2005 
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