2 antennas: Same model, different characteristics

Hi there! Some of you may remember that I used a RH-770 antenna for my handy-talkie. I found out that the one I had been using was a imitation. So, I obtained a Diamond brand RH-770 antenna from Blazer Electronics Center in Sim Lim Tower. That being said, if you are in Singapore or manage to get a chance to come, you should visit the shop one of these days!
It is located at the basement, for your information.

So, here are the 2 antennas side by side. Can you guess which one is the imitation? 😉









So, Mr Jeff used his Anritsu Site Master to test the performance of the antennas. Here are the results of the imitation antenna.

VSWR plot:








Smith Chart:

As you can see, the imitation antenna is good on the VHF band but it doesn’t perform as well on the UHF band. What about the Diamond RH-770? Here are the results.

VSWR plot:








Smith Chart:








So, the old saying is true, you get what you pay for! The Diamond RH-770 works well on both VHF and UHF bands! Definitely will recommend people to get this antenna for their handy-talkies if I can.

Anyway, thanks for taking your time to read my blog!

Joyce Ng (9V1AN)

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