[hpsdr] PennyWhistle - Call for Comments

[Greg Clark]

here's my .02

1) I'd prefer SMA connectors -- nice and small / lightweight, but BNC
works as well
2) power at HF vs 6 meters?  I'd say keep it simple.
3) I'd like one ASAP, and would be more than willing to assemble
myself if it saves 'months'.  What's the size on those components?
0805 / 1206?  I'd much prefer that to thru hole.

interested to hear what you find re: the new power transistors.

-- Greg K7RKT



On Fri, Feb 6, 2009 at 3:05 PM, Graham / KE9H <KE9H at austin.rr.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> All:
>
> Before I do a layout of the (hopefully) final
> version of PennyWhistle, I would like to call
> for comments.
>
> If this is something you would be interested in,
> please review...
>
> http://hpsdr.org/wiki/index.php?title=PENNYWHISTLE
>
> It has been updated with an "off the shelf" output
> transformer from Communications Concepts, as well
> as the power output versus frequency plots have
> been added.
>
> Questions:
>
> Do you prefer BNC versus the SMA connectors shown?
>
> Considering the differences in power output at
> 6 Meters versus HF, should a relay be added that
> would switch the output peaking between HF and
> 6 Meters, or is the performance with a fixed
> capacitor at one setting or the other adequate
> for your purposes?   (that is, keep it simple)
>
> Is a bare board kit preferable if it saves multiple
> months for availability?  Are you comfortable
> building a kit with about two dozen SMT parts?
>
> I have a suggestion from Phil H to add a feedback
> winding to (optionally) reduce gain and increase linearity
> when used as a driver for linears.
>
> I have a suggestion from Lyle J. to try the RD15HVF1
> in place of the RD16HFF1 transistors to increase
> performance at 6 Meters.
>
> --- Graham / KE9H
>
> ==
>
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