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Date Posted by Category User IP

2016-11-14 (UTC)


HF Antennas

Hy-Gain TH3-Mk3 Thunderbird Tribander + balun $150

Three elements on a 2” x 14’ boom. Longest element: 26’. Wind surface area: 3.4 sq.ft. Wind rating: 80 mph. Wind load at 80 mph: 85 lbs. Net weight: 36 lbs. Accepts masts from 2.5” – 1.25”. Some of the plastic trap caps were cracked so I wrapped them all in electrical tape and then coated it with liquid electrical “tape.” Includes a Hy-Gain balun. I think it’s a BN4000 but might be a BN86 (it doesn’t have a model number on it).
Maximum power input: 1kw AM. Antenna input impedance: 52 ohms. Gain: 8db min. F-T-B ratio: 20-25db. VSWR at resonance 1.2:1. Lightning protection: DC Ground.
It is currently assembled (except elements to boom) and I have VSWR curves plotted for the antenna in the clear at 60’. Includes original owner’s manual. Email for more pictures. This is a great little antenna. It would be ideal for someone able to pick it up as all you would have to do is attach the pre-assembled and tuned elements and mount it to a mast. I’m in the SF Bay area.

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