Fake Nagoya NA-771 Dual Band Antenna

NA-771
NA-771

eBay yet again doesn’t disappoint when it comes to fake kit. Here is a claimed dual-band antenna, a Nagoya NA-771. This is supposed to be good for both 144MHz & 433MHz.

Base Logo
Base Logo

The first clue is in the logo printing on the base, it’s not straight, or even. The base isn’t aligned correctly with the connector either, being glued on at a janky angle.

165MHz
165MHz
433MHz
433MHz

Beyond looks, a network analyser really shows the problems. Here’s a scan from 50MHz to 500MHz. There’s a fairly decent SWR of 2.01:1 at 164MHz (the tuning is still off, it’s supposed to be at 144MHz), but the SWR at 433MHz is 13:1!

544MHz
544MHz
920MHz
920MHz

Extending the range to 1GHz does show another couple of resonant points, at 544MHz (1.99:1) & 920MHz (2.83:1), well outside the band that this antenna is supposed to work to.

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