Jim's questions and stability queries...
Ashhar Farhan <farhan@...>
jim,toggle quoted messageShow quoted text
there would be far less stability problems if you built modular style!!
you will have better isolation and the manhattan style also provides
a ground plane for excellent stability.
that said, i think i need to clarify somethings about the PA stability
ours is an open project that is largely driven by the community of builders
a single person or organization. hence, there is a difference between how
issues are raised and
to begin with, let me say that the bitx's PA stability issues are not
serious. It is, in fact, one of the more stable power amplifier line ups out
there. every stage has negative feedback except the power amplifier and they
are all individually stable.
If we had mandated a single type of construction, same type of enclosure,
power supply etc, we would have got repeatable performance from each build.
however, ours is a different approach, a quick look at the group's photo
section will reveal that everything from altoid tin boxes to boat anchors
have been tried as enclosures. constructions have ranged from professionally
done PCBs to rat's nest wirings.
the most redeeming feature of bitx is every one of them finally works. this
is not due to any particular magic of circutry, but the nature of the
project. it is one of the most well understood homebrew projects, several
hams with years of experience like leonard, dan, arv, etc. have worked for
days at it, understanding the nuances and making us aware of the issues, and
like any other open source project, you will find several people pointing
out to issues and others solving them. that doesn't mean that this project
has more issues than others. it is a testament to the culture of enquiry and
elmering that ham radio has stood for.
On Feb 8, 2008 4:15 AM, JShroomy <@ab9lm> wrote: