Yes I have a common mode choke.

From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Tuesday, April 01, 2025 11:32 PM
To: Mlandress via OFARC
Subject: Re: [OFARC] FW: Nano VNA Sweep Profile

Do you have a Choke at the antenna feed point?  60 ft of coax is close to a full wave on 20 meters.

On Apr 1, 2025 8:49 PM, Mlandress via OFARC <[email protected]> wrote:

Try this again

From: Mlandress [mailto:[email protected]]
Sent: Monday, March 31, 2025 8:22 PM
To: 'OFARC'
Subject: Nano VNA Sweep Profile

All, for a practical application, here is the results of my nanoVNA setup from my shack into a Butternut HF-6V antenna.  This was not calibrated on each band so some of the TDR results are off.  The actual distance is about 60 feet of Belden RG8.

The Butternut is hard to tune because of the coil design and because I have this mounted on an awning pole about 10 feet high with no radials. 

At the antenna, it looks a bit better but my key problem is 5:1 SWR on 20m which is the band I’m usually working.  Works very good on 6m also.

Unit is a Nano VNA with a 2021 build date v 1.0.71.  Software is NanoVNA Saver v 0.5.5 0.