[hpsdr] Possible added feature request

[Scott Traurig]

There are plenty of examples of how to do this. Building the requisite
coupler is not difficult. You can buy them from Xtronic.

Here's a more relevant example:
https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1191&context=eesp

Incorporating something like a NanoVNA into this design, and changing the
software to calculate the required L and C directly instead of iteratively
should be possible.

This could also be accomplished using a link coupled topology if you prefer.

73,

Scott/w-u-2-o

On Tue, Nov 3, 2020 at 2:38 PM <radio at netins.net> wrote:

>
> Using SWR is done when tuning L networks, but would like to try adding
> stepper motors to a Johnson Viking Matchbox so I can use it.
>
> I can't seem to come up with a method to tune for minimum SWR.  I suppose
> one would adjust first the tuning and step the loading one way or the other
> and use the low SWR position to hold for the next iteration.  Then repeat
> that process over and over.
>
> I have been told it is quite difficult to make a directional coupler that
> works well over the 160 - 6m range, but a calibration file could be made at
> the antenna system feed point (input side of Matchbox) that might get a
> close enough calibration to use for tuning.
>
> John,  W0GNhpsdr-openhpsdr.org/
> <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/>
>
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