Constructing a Tape Measure Yagi Antenna

For Hidden Transmitter Hunting
or Fox-Hunting

Parts List

  • 3 feet of 1/2 inch schedule 40 PVC pipe
  • 3 – 1/2 inch schedule 40 cross connectors
  • 2 – 1/2 inch schedule 50 caps
  • 1 – inexpensive tape measure (I used a 5/8 inch wide tape, but a 1 inch wide will be better)
  • 4 feet coax cable with a connector on one end (UHF, BNC, SMA, etc.) and the other end prepared for soldering
  • 6 – #12 (11/16 inch to 1 1/4 inch) hose clamps (You may buy a bag of 10 and save money)
  • Black electrical tape
  • 5 inch piece of solid wire for hairpin tuning component (12 to 18 gauge will work)

Tools required

  • Hacksaw or PVC pipe cutter
  • Soldering iron or gun
  • PVC cement
  • Electronic solder
  • Wire cutter
  • Flat blade screw driver or 5/16 inch nut driver (to tighten hose clamps)


Step 1

Cut an 11 1/2 inch, a 7 inch, and two 5 inch pieces of PVC pipe.  Before cutting the pipe, it might be helpful to measure and mark the length using a sharpie black marker.


Step 2

Glue an end cap on each 5 inch (short) pipe.


Step 3

Glue the two long pipes together using a cross connector (as pictured).


Step 4

Glue the two remaining cross connectors on to each end of the assembly from step 3.  Make sure to align the cross connectors.  An easy way to align the connectors is to place them on a flat surface before the glue sets and twist them to be flat with the surface.


Step 5

Glue the two short pieces with end caps to each end of the assembly from step 4.


Step 6

Cut four pieces from the inexpensive tape measure: 41 3/8 inch, 35 1/8 inch, and two lengths of 17 3/4 inchs.  Be careful not to cut yourself on the sharp corners or ends.

Apply short pieces of black tape on each long section, and on only one end of the two shorter pieces.  This is for protection from the sharp edges.


Step 7

Attach the longest (41 3/8 inchh) piece of tape rule to the cross connector closest to the center cross connector.  It will be helpful to mark the center point (20 11/16 inches) with a black sharpie marker.  Position the tape over the cross connector, so the curve of the tape rule is similar to the curve on the cross connector.  Center and secure the element with hose clamps on each side as pictured.

Attach the next longer element (35 1/8 inch) to the cross connector at the other end of the boom in a similar fashion. 


Step 8

Prepare the hairpin tuning match by bending it into a “U” shape about 3/4 inch wide and tinning the ends of the wire.


Step 10

Scrape about 1/4 inch of paint off of the two remaining pieces of tape rule from the untaped ends.  Tin the bare areas, then attach the hairpin match and coax wire.


Step 11

Next attach this assembly to the boom using two hose clamps (as pictured below).


Step 12

Secure the coax wire to the boom with a zip tie or black tape.  The antenna is now ready to use.

Construction plan written and photographed by Tom Niderost, K4TMN
Original plan found on Joe Leggio’s (WB2HOL) website

Additional design modifications (handles on each end) by Andy Woolard, AA4XS

Annunci

Un commento su “Constructing a Tape Measure Yagi Antenna

  1. This is really attention-grabbing, You’re a very professional blogger… I have joined your rss feed and sit up for in the hunt for extra of your great post.. Also; I have shared your website in my social networks! Mission Viejo Roofing Service, 26161 Cordillera Drive, Mission Viejo, CA, 92691, US, 949-238-6004

Rispondi

Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione / Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione / Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione / Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione / Modifica )

Connessione a %s...