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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

CHA TACYAGI-70 Quick Assembly Sequence

Deploy the TACYAGI-70 by unfolding and locking each spring-loaded element, keeping the reflector, driven element, and director in their documented order, attaching and tightening the pistol grip when handheld or tripod mounted, then connecting the feed line.

TACYAGI-70 Handbook CHA TACYAGI-70 Reviewed 2026-07-19
Start with the practical answer: Deploy the TACYAGI-70 by unfolding and locking each spring-loaded element, keeping the reflector, driven element, and director in their documented order, attaching and tightening the pistol grip when handheld or tripod mounted, then connecting the feed line.

Why this matters in the field

Element order and geometry create the directional pattern; incomplete extension or damage changes both match and performance.

Use the antenna the way its geometry was built to work

The current guide documents a 13.7-ounce, sub-18-inch folded three-element UHF Yagi with 7 dBi published gain, greater than 15 dB front-to-back ratio, a 100 W rating, and less than 2.5:1 SWR across 400–470 MHz. In the field, that advantage still depends on element order, full extension, direction, polarization, mounting, and UHF feed-line loss.

Use this sequence

  1. Step 1: Lay out all parts.
  2. Step 2: Inspect for damage.
  3. Step 3: Join the boom as documented.
  4. Step 4: Extend and lock each element.
  5. Step 5: Connect and strain-relieve coax.
  6. Step 6: Final-inspect before raising.

Read the result—not just one meter

  • Change one important variable at a time and restore the baseline before the next comparison.
  • Separate what was observed from what was inferred. Signal level, decoded quality, impedance, SWR, audio reports and error rate are different measurements.
  • Repeat the test. A result that cannot be reproduced should be recorded as provisional rather than turned into a general rule.
  • Use the lowest practical test power and preserve screenshots, analyzer files, photographs, radio settings and location notes.

The shortcut that causes trouble

Transmitting with a partially extended or bent element. This shortcut hides the limiting subsystem and can create an incorrect repair or operating conclusion.

TACYAGI-70 is UHF, not VHF. Its physical frequency range does not authorize transmission on every covered frequency, and a 1/4-20 camera thread or adapter-supported 3/8-24 path does not make every support structurally interchangeable.

Source boundary

CHA TACYAGI-70 Operator’s Manual, Rev. 2/7/2025. Confirm the current rule, guide, frequency, configuration, site, and safety limit before acting.

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