There is just such a schematic for the mfj209 in the february 2007 qst.

I approached Dr. Jue of mfj at dayton about making this an add on for the 
209.  Will get back with him next week and see what the progress is.

----- Original Message ----- 
From: "Gary Tillinghast" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, June 27, 2014 1:24 PM
Subject: Re: Gotta love them analizers!


> Thanks for the thoughts Eric.  To have a analyzer giving input to a 
> computer
> through a interface cable, means I need to drag along another piece of
> equipment to read the display. I would perfer to have it stand alone.   If
> it is so simple, couldn't one make a schematic and some of could build
> these?  Gary KB2YAA
>
> -----Original Message----- 
> From: Eric Oyen
> Sent: Friday, June 27, 2014 6:28 AM
> To: [log in to unmask]
> Subject: Re: Gotta love them analizers!
>
> well,
> considering that most of the antenna analyzers contain 3 elements of =
> concern to us, its relatively simple to design 1 or 2 accessibility =
> solutions.
>
> the first is a simple VCO (voltage controlled oscillator). This would be =
> for use with the 2 meters on board (the reactance meter and the SWR =
> meter)
> the second would be a simple programmable voice chip/interface that =
> would read from the frequency display input lines. Considering there =
> would be 6 total digits and 3 decimal point locations, this makes the =
> speech interface rather a lot simpler than what one has to do with a =
> screen reader. If Braille cells didn't cost as much as they do, creating =
> a tactile frequency display for the unit would be inexpensive. all you =
> would need would be to translate a-j and the decimal point. that would =
> be a 7 cell interface with only the absolute minimum of hard wired =
> programming (in an Eprom). or, if the braille display idea is too =
> complex, using the same Eprom and some low bit recorded voice and a BCD =
> decoder (7 segment displays are Binary coded decimal where a display =
> will have 12 possible states where 00000000 =3D off and and each segment =
> pattern will have a specific value). I can compile a simple table =
> displaying how this could be done using binary states if anyone wants =
> it.
>
> Since we are not concerned with accuracy lower than 1 Khz, this makes =
> the idea of building a hardware speech interface pretty simple.
>
> Now, some of the newer units have a USB interface, and a program to read =
> that data from the device, with a little programming know-how, one could =
> use jaws on windows or some other screen reader (voiceover on mac, orca =
> or one of the dozen other open source screen readers on Linux).
>
> there are several possible solutions here, some of them fairly cheap.
>
> Ideas, suggestions, comments?
>
> -eric
>
>
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