[hpsdr] PennyWhistle Comment Summary

[Todd Mondragon]

How did the VHF transistor experiment turn out for you?

2009/2/16 Graham / KE9H <KE9H at austin.rr.com>

> ***** High Performance Software Defined Radio Discussion List *****
>
> All:
>
> Thanks to all that took the time to comment.
> I have summarized the comments below
>
> Connectors:
> Extremely strong support for BNC rather than SMA.
> For those who wanted direct wire attach, you can easily do
> that with either a BNC or SMA footprint. Center to center,
> and shield to any ground via of your choice.
>
> Surface mount parts:
> The majority of the group seemed quite comfortable building this
> level of surface mount kit.  There are only about two dozen surface mount
> parts.
> The SMT part size is the largest common size, that is, 1206 for
> caps and resistors.
>
> Regarding the switching relay, majority said "keep it simple."
> I will provide the capacitor values for both the tuning
> points of 30 MHz and 50 MHz peaking, so the builder can do
> as he pleases.
>
> The option will be provided for an extra feedback turn
> on the balancing transformer, for those that want to dump
> some gain (and lower power output), and increase linearity
> for driving another linear.
> Regarding substituting some VHF transistors for the HF
> transistors for more consistent output at 6 Meters.
> I have ordered and received some of the VHF transistors.
> I'll install them this week and see what it looks like.
> The footprint is identical to the HF transistor, so no
> matter what the outcome, it should not affect the board
> layout.
>
> --- Graham
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20090404/8fb0ed3e/attachment-0002.htm>