[time-nuts] Safely getting the electrical length of a connected antenna feedline
cjaysharp at gmail.com
Tue Aug 9 04:30:49 EDT 2016
I doubt it's worth mentioning that a random SMD footprint cut from a larger
board and some of the currently available eBay SMD adapter boards may have
plated through holes which could short if used to prototype on copper clad
board so it's worth paying a little attention to insulating the
'underside' of the boards.
On 9 Aug 2016 08:00, "David" <davidwhess at gmail.com> wrote:
> Richard mentioned the SMD to leaded adapters which work well.
> Another way which is more suitable for Manhattan or dead bug type
> construction is to glue or solder down just tiny printed circuit board
> which has the SMD footprint and then solder directly to the leads or
> extensions to the pads. This does not increase the lead length any
> more than necessary and places the ground plane in close proximity for
> best RF performance. If you are desperate, you can cut an SMD
> footprint out of an existing unused donor board.
> On Tue, 9 Aug 2016 03:37:07 +0000 (UTC), you wrote:
> >Your comments on layout made me think again of how to implement these
> projects. How do you use a 14 pin SMD IC? I could try to connect it with
> flying leads but I'd like something better. Is there some kind of socket
> for these devices? Or a generic board to receive such things?
> >On Monday, August 8, 2016 8:02 PM, David <davidwhess at gmail.com> wrote:
> > I actually tested various 74120 dual 4-input NAND drivers which
> >produce the sync output on my B&K function generator to find ones
> >which would provide the fastest and cleanest pulse. AS (advanced
> >schottky) and FAST (fast advanced schottky TTL) were the best for me.
> >Modern inexpensive discrete logic however can do a much better these
> >One interesting thing I learned is that the dual 4-input NAND pinout
> >overlaps the quad 2-input NAND pinout so in a properly designed layout
> >where only 2 gates are used, either part can be used.
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