Ground jumpers (Was: RE: [Elecraft] Electronics & radio questions: Don't be shy--go ahead and ask!)

[Don Brown]

Hi

If Wayne doesn't mind I will answer this one. The ground jumpers are a
convenient place to connect the ground for your meter or scope when making
measurements or calibrating the radio. The 6 mm is not critical but must be
high enough to get a clip lead on to the test point. I have worked on a few
radios where the ground jumpers were so close to the board that it was
impossible to use them. I also like to use the clipped leads from 1N4007
diodes for the jumpers because they are larger and less fragile when used as
a test point like this. It is the little things like this that shows the
thought that went into the design of the K2 and K1.

Don Brown
KD5NDB


----- Original Message -----
From: "Bozidar Benc" <benc@benc.hr>
To: "Elecraft" <elecraft@mailman.qth.net>
Sent: Wednesday, May 21, 2003 3:34 AM
Subject: Ground jumpers (Was: RE: [Elecraft] Electronics & radio questions:
Don't be shy--go ahead and ask!)


> Wayne,
>
> Here is the first one. :-)
>
> I've built K1 and K2 with almost all options (my KAT100 didn't arrive
yet).
> Almost every PCB has two, or more, 6 mm high, "U" shaped ground jumpers.
> All around those jumpers is ground so for DC they are not needed.
>
> My question is, why they are needed? Why they must be loops 6 mm high?
> Is there anything special in their positions on PCBs?
>
> TiA
>
> Bole, 9A3RR
>