Tape measure yagi
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These are directional tuned antennas, perfect for fox hunting.
Note that in both antennas, the measurement between elements is center to center and does not take into account extra length added by the pvc cross piece.
2m yagi[edit | edit source]
- https://w5nor.org/tape/
- https://www.jpole-antenna.com/2017/02/07/build-it-2-meter-tape-measure-yagi-beam-antenna/
- https://www.instructables.com/The-Tape-Measure-Antenna/
| part | dimension | |
|---|---|---|
| reflector | 41 3/8" | |
| r-d pvc | 8" | |
| driven element | 35 1/2" | |
| d-d pvc | 12 1/2" | |
| director | 35 1/8" | |
| hairpin | 12 gauge / 5" | (with 1/4" tips to solder) |
70cm yagi[edit | edit source]
Note: the hairpin match is quite short, and can sometimes be just a bit longer than the gap between the elements, despite the picture.
| part | dimensions |
|---|---|
| reflector | 13 19/32" |
| r-d pvc | 2" |
| driven element | 5 3/8" (x2) |
| d-d pvc | 3 3/32" |
| director | 11 1/16" |
KQ4VQC Yagis[edit | edit source]
See also
- CAD files, also linked individually below.
- 3D printable element mount replaces PVC cross piece (2 parts, STEP format)
Common parts:
Per clamp:
| # | part |
|---|---|
| 4 | m3-15 screws |
| 4 | m3 nuts |
- 1 inch wide tape measure element (see below)
Per feed:
| # | part |
|---|---|
| 4 | m3-15 screws |
| 4 | m3 nuts |
- 1 inch wide tape measure element halves (driven element)
- coax
- hairpin wire
2m Design[edit | edit source]
- Bandwidth: <2 SWR 138Mhz-150Mhz
- Gain: 9.5 Dbi
- 2M EZnec model
Elements:
| Part | Length | Offset From Reflector |
|---|---|---|
| Reflector | 39.5" | 0" |
| Driven element | 17.5" (x2) | 12.5" |
| Director 1 | 34" | 17.5" |
| Director 2 | 34" | 27" |
| Director 3 | 33.5" | 41" |
| Hairpin Match | 4" | Director |
1.25m Design[edit | edit source]
- Bandwidth: <2 SWR 210Mhz-240Mhz
- Gain: 9.38 Dbi
- 1.25M EZnec model
| Part | Length | Offset From Reflector |
|---|---|---|
| Reflector | 24.5" | 0" |
| Driven element | 10.75" (x2) | 10" |
| Director 1 | 20.5" | 13.75" |
| Director 2 | 20" | 23" |
| Director 3 | 20" | 33.75" |
| Hairpin Match | 3" | Director |
70cm Design[edit | edit source]
- Bandwidth: <2 SWR 407Mhz-490Mhz
- Gain: 10.74 Dbi
- 70cm EZnec model
| Part | Length | Offset From Reflector |
|---|---|---|
| Reflector | 12" | 0" |
| Driven element | 4.75" (x2) | 5.25" |
| Director 1 | 9.5" | 7" |
| Director 2 | 9.5" | 11.5" |
| Director 3 | 9.5" | 17.25" |
| Director 4 | 9.5" | 23.5" |
| Director 5 | 9" | 30.5" |
| Hairpin Match | 2" | Director |