[TowerTalk] Measuring resonance of a yagi element

[David Gilbert]

It has been a while since I kept up to date on it, but this link shows 
what I believe to be the safest bet to get the right version of the 
model I was referring to.  Amazon also has several offerings, most at 
higher prices, and even I can't tell for sure how valid some of the 
listings are.  In general, you want the unit with a 3.4 inch display, a 
650 mah battery, and internal metal shielding.  In the past some 
knockoff units didn't have the shielding, had crappy soldering, and even 
came without the battery.  The Hugen one via the link below has always 
been a reliable source and will also have the latest firmware installed.

https://www.alibaba.com/product-detail/3-4-version-650mAh-battery-Original_62342877955.html?fullFirstScreen=true

The only problem is that some folks have had difficulty getting their 
credit card company to accept payments to Alibaba.  In those situations, 
this link will get you in contact with Maggie King who can set up a 
transaction via PayPal.

*https://tinyurl.com/y9xpssnc *(it was a very long URL)

By the way, if I remember correctly, the original NanoVNA was designed 
by a Japanese fellow, but Hugen upgraded the design and made it widely 
available with good manufacturing quality.

That's the best I can do, I'm afraid.  There is a very active groups.io 
forum on the NanoVNA with LOTS of information, as well as updated files 
for both the firmware and some freeware software to operate the NanoVNA 
from a computer that adds some very nice additional features.  The forum 
was so active that I had to mute the regular emails because I was 
getting so many of them.

73,
Dave  AB7E




On 4/21/2020 9:12 PM, Richard (Rick) Karlquist wrote:
>
>
> On 4/21/2020 8:48 PM, David Gilbert wrote:
>>
>> calibration units.  There are lots of inferior copies, though, so do 
>> a bit of research to find out which ones are the real deal.  They can 
>> be found on both eBay and Amazon.
>>
>> Dave   AB7E
>>
>
> So how are we supposed to determine the "genuine" ones?
>
> Rick N6RK
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