Allison
All can produce posting quality files. I usually use "Dia" and set it to
make .png (Portable Network Graphics) output. You have to save a copy in
native .dia format first, then "export" the drawing and set the file type to
".png" or ".jpg" as desired.
There are examples of Dia produced schematics on my web sites
<www.k7hkl.webhop.net> and <www.qrp.webhop.net>. There are also some Dia
built schematics at BITX20/FILES/K7HKL/...
Arv
_._
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On Friday 29 July 2005 09:36 am, ajparent1 wrote:
Ok, Looks good which one produced the most usable output
for posting?
Afterall I can post gerber files and vectorlists but they are
hardly easily seen.
Allison
KB1GMX
--- In BITX20@..., Arv Evans <arvevans@e...> wrote:
> Allison
>
> Free Schematic CAD software that should run on your Microsoft NT-4.x
can be
> obtained via the following URLs:
>
>????
>
>????
>
>????
>
> All of these sites provide freeware schematic drawing software for
windows
> (and for Linux) that would be suitable to use in drawing a partial
schematic
> for the changes you have made in the BITX design.? Of these three,
EagleCAD
> from CadSoft is probably the closest to a professional CAD program,
but the
> other two are certainly adequate and may be easier to learn.
>
> And...Yes, there are other schematic drawing programs available.
These are
> just the ones that I know about and use frequently.
>
> Arv K7HKL
> _._
>
> On Thursday 28 July 2005 09:52 pm, ajparent1 wrote:
> >? The best I can do would be jpeg photo of hand drawn paper page.
> >? Even that takes some effort as only one PC supports USB and this
> >? is not that one.? All my schematic capture cadd stuff runs on
> >? VAX/VMS and is generally incompatable with PCs.
> >
> >? I may add the change is not very big.? I just turned the circuit
> >? around to reverse the LO and IF ports. The transformer T3 feed
> >? IF and Q9 feeds the balance pot through the .1uF cap.
> >
> >? If there is a prefered PC schematic capture I may investigate
> >? but it must run under NT4 on a slow machine as this box is
> >? generally accessable.
> >
> >? Allison
> >? KB1GMX
> >
> >? --- In BITX20@..., Arv Evans <arvevans@e...> wrote:
> >? > Allison
> >? >
> >? > Would it be possible for you do a quick schematic of the
changes and
> >? store it
> >
> >? > in the FILES section of this forum?? That way it will be available
> >
> >? for others
> >
> >? > who might not understand all that was changed from just the textual
> >? > description.
> >? >
> >? > Thanks,
> >? >
> >? > Arv K7HKL
> >? > _._
> >? >
> >? > On Thursday 28 July 2005 09:20 pm, ajparent1 wrote:
> >? > >? One of the things I didn't like in the 20m proto BITX I'd built
> >? > >? was the presence of audio getting into the IF amp on
transmit and IF
> >? > >? noise in to the audio on recieve.? I'd gone the route of
adding an
> >? > >? 47uh RF choke from the intersection of the balance pot wiper to
> >
> >? ground
> >
> >? > >? which helped greatly.? However, it always bothered me.
> >? > >
> >? > >? So I opened it up and tried a design change that I find
pleasing and
> >? > >? also elimiates a number of components.? As an engineer I'm
the sort
> >? > >? that looks at a design and says "what if..?".? The solution was
> >? > >? staring me in the face and also eliminates the PI attenuator
as well.
> >? > >? The change is to turn the balanced modulator around and feed
the IF
> >? > >? in on the transformer and RF (bfo) in at the balance
potentiometer
> >? > >? via the .1uf capacitor.? This eliminated the need for the 3
resistors
> >? > >? and the rf choke.? I noted cleaner modulation, less RX noise
and more
> >? > >? gain available in both RX and TX.
> >? > >
> >? > >? Might as well add this mod to the collection.? I plan to use
this
> >? > >? mod in the 6M version.
> >? > >
> >? > >? Allison
> >? > >? KB1GMX
> >? > >
> >? > >
> >? > >
> >? > >
> >? > >
> >? > >
> >? > >
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