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G8MNY  > TECH     11.06.19 11:30l 105 Lines 4380 Bytes #3 (0) @ WW
BID : 7926_GB7CIP
Read: GUEST
Subj: Windup 8M /P mast design.
Path: ED1ZAC<ED1ZAC<CX2SA<GB7CIP
Sent: 190611/0920Z @:GB7CIP.#32.GBR.EURO #:7926 [Caterham Surrey GBR] $:7926_GB
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                             (new Nov 04)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

Here is a mast system for the side of a car or van with a gutter.

       AERIAL
         ││
         ││
         ││
         ├┤ 3m - 8m
         ││ Extendible
         ││ Wind up
 X frame ││ Mast
 Bracket ├┤
  .---.\_││
 │ Van │ │┼|[_ Winding
 │_____│ ││    Handle
  U   U  ││

(The X backet discription is in another bul.)
 
WIND UP MAST SYSTEM

   Grooved                            Wooden
  Wooden \░                           │Pole :  :Grove │
    Pole  ░                           │     :  :      │
          ░                           │____ :  : _____│
Pulley    ░                          │-----││\/││------│Pulley
Wheel \ _ ░                          │    [││||││]     │& Steel
       |0|░│Ally                     │-----││||││------│Strap
       |│|░│Pole                     │     └─||─┘      │
 Brake |│└░│                         │       ||        │
Cable\| │ ░│    Pulley               │       ||        │
      | │  │ _ /Wheel                │      Wire       │
      |││  │|0|                     Ally Pole
      |││  │|│| Brake
      |││  │┘│|/Cable
      |││  │ │|                      │       ||Wire    │
      |││  │ │ |                     │       ||        │
      └│     │ |   o Handle          │       ()        │
2" Thin│     │ |__/                  │                 │Ally pole
  Steel│     │=(__) Winder           │                 │
  Tube │     │       & Ratchet       │          Lopped │
       │     │                       │      === Wire   │
       ż     ď Welded                │_____││_││_______│
               Bottom                      Slots

HOW IT WORKS
When U wind the handle the middle ally section is lifed, that in turn lifts the
inner wooden section as well. So the 3m pole soon becomes 8m!

It consists of a 1.25" dia 10ft wooden pole inside an ally 1.5" dia tube inside
a 2" steel tube. The wooden pole has a V shaped slot cut in it down one side
for the flexible pull up bicycle brake cable wire. The Aluminium & Steel poles
have a slot for small pulley wheels at the top of each, supported by a thick
steel strap around the pole to hold the axle (bolt).

Near the bottom of the wooden pole (35cm) is attached to a steel cable that
runs over a pulley on the top of the ally pole & fixed to the steel pole
(winding hand shaft).

Another flexible steel wire attaches on the same side as its pulley, to the
inside bottom (slots made for a loop) of the ally tube & threaded though a hole
(35cm up) & goes over a pulley wheel on the top of the steel tube, then on to a
winding wheel & ratchet!

             _____│ \                    Spool      │          │
             \        \ /\               Bearimg    │Steel Tube│
  Gravity   /Course Teeth │              Rod    ----│----------│-
  Ratchet /_   cut in_________           mount >│( )│Steel Band│o│ Clamp
   Paw    /│     (0)__________0                 ----│----------│-  Screw
     (o)/' │/|  wire spool/   Handle         Welded │          │& ratchet
      /'      \   _  Outer                or brased │          │   Pivot
                \│ `-._\
           W I N D E R                 Winder Bearing shaft & ratchet pivot
            S P O O L                   Mounted on strap around steel pole

When the mast is fully up the 2 wire attachment points will be opposite the
pulleys resisting pole section rotation at the overlaps.

IN USE
Put aerial & coax on to wooden pole with clamps. Pop the pole vertical, attach
to X bracket (bungee), then wind the handle. Use the bungee tension to stop
the mast for turning! Keep the bottom position on the ground to keep vertical. 

Depending on conditions bottom can be left on the ground or a bearing plate
pegged in. Drive over ones seem a good idea but U need to be able to reposition
it to make the mast vertical.

It is generaly wise to have cables well secured tp the top section, so that
there is something to pull down with of it does not telescope shut smoothly!

In public areas I guy the mast with 4 guy strings for safety as well!

Also used with it is a 12V rotator that the mast sit on. It is a low torque
easily stalled rotator so of anying fouls up, it does no damage!


Why Don't U send an interesting bul?

73 de John G8MNY @ GB7CIP


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