[hpsdr] Possible added feature request

[Dick Faust]

Another possible example, with software and other design files:

https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards

Uses a simple coupler for SWR with relay switching for capacitors and 
inductors.

Dick K9IVB

On 11/3/2020 8:31 PM, Scott Traurig wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
>
> 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 
> <mailto: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/>
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/