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!

73,
Joyce Ng (9V1AN)

A new year, a new beginning

Hi there! I haven’t written anything since last year, so that being said, Happy New Year! =)

Its almost a year since I got involved in the hobby of amateur radio. So, what are my plans for this year?

Firstly, I’ll continue to do all sorts of experiments like what I have been doing, and of course, you’ll get to see them here! =)

Secondly, I’ll be giving presentations at SARTS, and hopefully, at schools like my secondary school so that I can introduce youth to the hobby of amateur radio. I’ll be doing a few technical presentations this year. Hope that I can impart some of my knowledge to everyone!

Thirdly, I’ll be organizing or helping out with events such as field day in Singapore and maybe set-up temporary radio stations at schools for students and the general public?

This year will definitely be packed with various events. Hope to be able to learn more things about radio this year!

Thanks for reading!

73,
Joyce Ng (9V1AN)