[time-nuts] Safely getting the electrical length of a connected antenna feedline

Scott Stobbe scott.j.stobbe at gmail.com
Tue Aug 9 04:33:37 UTC 2016


Gate drivers are pretty zippy when you leave out the capacitive load of a
power fet's gate. They are also available in 8 pin dip.

On Monday, 8 August 2016, Bob Albert via time-nuts <time-nuts at febo.com>
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?
> Bob
>
>
>     On Monday, August 8, 2016 8:02 PM, David <davidwhess at gmail.com
> <javascript:;>> 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
> days.
>
> 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.
>
> On Mon, 08 Aug 2016 16:31:44 -0400, you wrote:
>
> >If you have a function generator with a sync output, you can use that
> pulse
> >into a T connector with your scope to do a TDR measurement of the cable.
> If
> >you have a scrap of the new cable, you can use that to calibrate the
> setup.
> >
> >Regards,
> >Tom
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