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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