Update PA7N miniVNA

MiniVNA - Wednesday 28 December 2011 15:59
I have made some improvements to my miniVNA software. I added measuring L, C and Q. There is also A new calculator to calculate L or C. On the DUT port you can put A known C in series with an unknown L (or vice versa) and calculate L by putting marker1 on the resonance frequency. You have resonance when Xs is almost zero and/or when there is a phase turning.

More info and download
By: Erwin PA7N | Permalink | 2 comments


IK6GQC Rocco

Tuesday 10 January 2012 12:52
congratulations for miniVNA software.
I would like to ask you what software do you recommend to capture the screen and print it.
thanks 73 Ik6GQC Rocco

PA7N Erwin

Tuesday 10 January 2012 13:32
Hello Rocco,
The easiest way is your "Print Screen" key and then copy/paste in some other program like photoshop.
73 Erwin

Early alpha version available of my miniVNA software

MiniVNA - Saturday 19 December 2009 10:47
Early alpha version available of my miniVNA software.

More info on this page: PA7N miniVNA
By: Erwin PA7N | Permalink | 5 comments


Karl Jan Skontorp

Friday 18 December 2009 22:32
I just wonder which components you have used in Delphi to make the graphics. I'm working on a similar project and is just wondering.....
73's de Karl Jan LA3FY

Karl Jan skontorp

Friday 18 December 2009 22:37
Delphi and grapichs.....
Of course I mean in the miniVNA project!!


Erwin PA7N

Saturday 19 December 2009 11:14
Hi Karl Jan,
I use no special component for drawing. Just TBitmap and double buffered painting. This way you get a flicker free screen.
The communication with miniVNA runs in a separate thread so it won't block the user interface.
73 Erwin

Matti Niemela

Saturday 9 January 2010 17:10
Hello Erwin PA7N,

Thank you for the nice MiniVNA program. Latest version works OK. I like especially possibility to tune also under 100 KHz even though the levels are lower of course. Anyway I can check the resonance frequencies of LC-circuits on VLF-band 10 kHz-100 kHz also with these reduced levels.
I measured following levels with W&G Level meter SPM-19 in to 50 Ohm load.

5 kHz - 53.2 dBm
10 kHz -33 dBm
20 kHz - 18.8 dBm
50 kHz -7.7 dBm
75 kHz - 6.9 dBm
100 kHz -6.2 dBm

Best 73

Matti OH2ZT

Mike Yetsko

Tuesday 17 May 2011 14:37
For a first effort that software looks pretty darn good!

I'd love to see your source code, and maybe even collaborate with you on the software!

Mike Yetsko