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Re: [TowerTalk] Measuring resonance of a yagi element

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Measuring resonance of a yagi element
From: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 21 Apr 2020 20:48:05 -0700
List-post: <mailto:towertalk@contesting.com>

For anyone who doesn't have an analyzer and may have missed some of the earlier posts here about the NanoVNA, it is an amazing vector network analyzer for less than $50.   There are people who have compared it to lab grade HP analyzers and found the accuracy to be within a percent or so up to 300 MHz.  It will display the results in Smith Chart form, as an S-parameter, or as a vector impedance (R +/- jX).  It is capable of both single port and two port analysis, and it even comes with it's own 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.

It's physically quite small, though, so take that into account if your eyes aren't great.  At least the LCD contrast is decent.

73,
Dave   AB7E



On 4/21/2020 8:28 PM, jimlux wrote:
On 4/21/20 7:04 PM, Robert Harmon wrote:
I new there was a reason to keep my old Millen grid dip meter  !

Bob
K6UJ

MFJ actually sells coils that hook on the 269 analyzer. They do in fact work, but I think you can do as well with a connector and a single wire loop. a cliplead works.

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