Tape Measure Yagi for T-Hunting by edbarnes

Last crawled date: 3 years ago

I updated the tape parts to better fit together when assembled. Also, the tape tip slide is beefier. I print 100% infill, ABS or PLA, no support. 2/2/2019.
The PVC tape measure Yagi-Uda antenna is a common amateur radio project for transmitter hunting. I built these parts to eliminate the PVC joints and hose clamps. You will still need a PVC pipe rod to mount these parts. I added screw holes for the bases so glue isn't required. Long M3 hex machine screws were used to mount the covers.
The 6 tips can be used to protect you from the sharp tape measure edges / ends. The second tip slot may be used to loop the tape and make it slide in length. (see photo, red tip) This is nice for storage and possibly tuning. You will need to account for extra length of tape for the loop. The loop mode is experimental. Use a marker to indicate the correct length for each element.
Print two sets of the DR parts. One set for the director and one for the reflector.
Print one set of the DE parts. (DE = Driven Element)
I used a length of Romex wire and stripped off the insulation for the hairpin. You can use regular 50 ohm BNC cable and cut off one connector end to connect to the antenna. You may need an attenuator. Attenuation is not part of this project.
I printed the bases on the side and the covers flat. The tips are printed standing straight up to help ensure the slots don't clog and fit the tape measure. 50 to 100% infill seems okay.
I was able to solder the tape measure material with a solder gun. I sanded the paint off the tape and then with lots of flux, tinned the tape end. Be sure to pre-tin the soldered parts and then assemble and solder the coax, hairpin & tape quickly to avoid melting the PLA too much.
Instructions by Joe Leggio WB2HOL are online.for the PVC version. In true ham cheapo tradition, these parts were designed for the Harbor Freight free-with-purchase coupon 25 foot tape measure. Enjoy! WA6ED