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2 Meter band colineal antenna

Original design by John Conklin WD0O - redesign and adaptations by Antonio Pontón WP4NAL

 

List of materials

 

1. Upper element = 1 aluminum tube 3/4" diameter x 48-3/4" long

2. Lower element = 1 aluminum tube 3/4" diameter x 78 3/4" long.

3. Matching stub = 1 aluminum tube 3/4" diameter x 23" long.

4. Phasing stub =

1continuous thread bolt 10-24 x 22" long (galvanized or stainless steel)

5. Insulator = cilindrical wood, plastic or fiberglass (non-conductive) stub x 9" long and with a diameter that will fit inside the 3/4" pipe.

6. Bolts for the phasing stub = four (4) stainless steel 

10-24

7. Washers for the phasing stub = (4)

10-24

8. Bolts for the gamma match = two (2)

3/16" diameter x 3 1/2" (bronze or stainless steel).

9. Nuts for the gamma match =  six (

6)

3/16" diameter (bronze or stainless steel).

10. Presure washers =  six (

6)	3/16" diameter (bronze or stainless steel).

11. Hose clamp = two (2) stainless steel hose clamps x 1" diameter. Used to connect the coax to the antenna.

12. U bolt = at least two (2) Radio Shack or similar for 1 1/2" pipe mast. This is used to secure the antenna to the mast (not shown in the drawing for clarity.)

12. Plastic cap = two (2) caps for 3/4" diameter pipe. This goes at the top of pipes. If you like, you can put two more at the bottom of the pipes to prevent insects from crawling inside.

13. Silicon o RV-Sealer = used to seal anything that may leak, specially the exposed coax endings and the area around the hose clamps.

14. Refreshments = just to make it more fun while you build the antenna.