HF Yagi Refurbishment

From SUWS-Wiki
HF Yagi Refurbishment
HF Yagi Refurbishment
Status In Progress
Project Lead User:TylerWard

HF Yagi Refurbishment

The clubs HF Yagi (a Cushcraft A-3S antenna) is in need of some refurbishment to put it back into a usable state. Some parts of the antenna have either corroded away or have been lost and need replacing, while others can be restored to working order.


Antenna Details

The HF Yagi is believed to be a Cushcraft A-3S.

This is a 20m, 15m ,10m yagi.

It was acquired as it was being thrown out by a Scout Club near Basingstoke, prior to the departure of their only licensed staff member.

Cushcraft Product Page

A-3S Assembly Manual (pdf)

Inventory page

Remaining tasks

  • test
  • Punch in trap ends to secure spacers
  • add remaining trap endcaps
  • Purchase required assembly tools
  • Create bracket for balun box
  • Stamp IDs into Traps


Parts List

From Manual

Code Desc required have location notes/link to buy QC
BA Aluminium tubing 1-5/8" x 12" (4.1 x 30.5 cm) drilled and slotted both ends 1 0 replace with solid boom
BB Aluminium tubing 1-1/2" x 84" (3.8 x 213.4 cm) drilled one end 2 0 replace with solid boom
EA Aluminium tubing 1-1/8" x 72" (2.9 x 182.9 cm) drilled for U-bolt, slotted both ends. 2 2 long bag slightly bent marked as blue 3 and black 3 QC7
EB Aluminium tubing 1-1/8" x 36" (2.9 x 91.4 cm) drilled one end, slotted both ends 2 2 long bag marked as red 3 QC7
EC Aluminium tubing 1" x 67" (2.5 x 170.2 cm) slotted one end 2 2 long bag marked as black 2 QC7
ED Aluminium tubing 1" x 65" (2.5 x 165.1 cm) slotted one end 2 2 long bag marked as red 2 QC7
EE Aluminium tubing 1" x 46-1/2" (2.5 x 188.1 cm) slotted one end 2 2 long bag marked as Blue 2 QC7
EF Aluminium tubing 1" x 5-1/4" (2.5 x 13.3 cm) slotted both ends 6 6 short bag QC7
EG Aluminium tubing 1/2" x 35-7/8" ( 1.3 x 91.1 cm) 6 5 short bag end elements (marked as red 1, blue 1 and black 1) (one damaged needs replacing) QC7*
TA 10 metre trap 6 6 short bag these are the ones that are big on both ends (some end caps missing) QC7**
TB 15 metre director trap 2 2 short bag mixed with TC's needs sorting (some end caps missing)
TC 15 meter driv. & refl. trap 4 4 short bag mixed with TB's needs sorting (some end caps missing)
11 010011 #8-32 hex nut 6 4 0
33 190033 Backing plate 2 0
41 011941 #8 split lock washer 6 4 0
46 050046 1-1/2" (3.8 cm) black plastic cap 2 0 do we want to cap the new boom
53 050053 1/2" (1.3 cm) black plastic cap 6 2 QC Failed
58 173658 3-1/2" (8.9 cm) V-block 2 Used on boom to mast assembly (alternate assembly will be used)
63 170063 2" (5.1 cm) V-block 2 Used on boom to mast assembly (alternate assembly will be used)
84 010084 1/4" (.6 cm) lock washer 6 0
85 010085 1/4" (.6 cm) hex nut 6 0
96 122096 10" (25.4 cm) fibreglass insulator 1 1 long bag marked as red 3 QC7
118 010118 5/16" (.8 cm) hex nut 8 Used on boom to mast assembly (alternate assembly will be used)
119 010119 5/16" (.8 cm) lock washer 8 Used on boom to mast assembly (alternate assembly will be used)
120 010120 #8-32 x 2" (5.1 cm) machine screw 2 used on boom not required
123 010123 #8-32 x 1-1/2" (3.8 cm) machine screw 2 0
143 190143 1-1/8" (2.9 cm) aluminium bracket 3 0
326 290326 Danger label 1 0
402 010402 1-1/2" x 3-3/4" (3.8 x 9.6 cm) U-bolt 3 0
403 010403 1-5/8" (4.1 cm) U-bolt 2 Used on boom to mast assembly (alternate assembly will be used)
404 010404 2-1/8" x 3" (5.4 x 7.6 cm) 2 Used on boom to mast assembly (alternate assembly will be used)
409 030409 11/16" (1.7 cm) worm clamp 6 0 all jubilee clips should be replaced
410 030410 1" (2.5 cm) worm clamp 18 0 all jubilee clips should be replaced
411 030411 1-1/8" (2.9 cm) worm clamp 8 0 all jubilee clips should be replaced
413 030413 1-5/8" (4.1 cm) worm clamp 2 0 used on boom not required
453 100453 Terminal 2 0 check balun fittings before ordering
919 190919 6" x 6" (15.2 x 15.2cm) mounting plate 1 Used on boom to mast assembly (alternate assembly will be used)

Additional/Alternate Parts

  • Balaun
  • 1.5in 14ft aluminium pole as boom
    • We have just (26th September 2016) acquired 3 approximately 15.5ft (4.72m) long 1.5in (40mm) aluminium poles which have a 1/8in (3-4mm) thickness. daveruss is currently storing these in his garage.
  • varnish/paint

Shopping list

Cushcraft

Cushcraft Code QTY
EG 1
11 4
33 2
41 4
53 6
84 6
85 6
123 2
143 3
326 1
402 3


Other

  • Jubilee clips
  • Ring terminals


Reference Photos

Old Boom

Traps