Fusing power cable on K3

[Elecraft mailing list]

I recently purchased a used K3 and am building a short power cord (after the discussion of voltage drop from longer cables).  I noticed that the power cable that came with my IC7000 has fuses in both leads.  Since the K3 has a built in fuse it is still a good idea to put fuses in both sides of the new power cable?  It will be only used in the shack, not mobile.

Dave K8WPE

David J. Wilcox K8WPE’s iPad
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[Roy Koeppe]

No, fuses have voltage drop both in their elements and contacts. Just what
you're trying to defeat and avoid.

73,   Roy    K6XK


I recently purchased a used K3 and am building a short power cord (after the
discussion of voltage drop from longer cables).  I noticed that the power
cable that came with my IC7000 has fuses in both leads.  Since the K3 has a
built in fuse it is still a good idea to put fuses in both sides of the new
power cable?  It will be only used in the shack, not mobile.

Dave K8WPE



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[Bob McGraw - K4TAX]

Since it is only to be used not mobile, I would not add a fuse to the
power cord.   It only adds a few tenths ohms but it still is added R
that isn't needed.

As to ICOM, any radio that is used mobile should be fused in the DC Pos
and DC Neg leads.

73

Bob, K4TAX

On 7/1/2019 3:45 AM, David Wilcox via Elecraft wrote:

> I recently purchased a used K3 and am building a short power cord (after the discussion of voltage drop from longer cables).  I noticed that the power cable that came with my IC7000 has fuses in both leads.  Since the K3 has a built in fuse it is still a good idea to put fuses in both sides of the new power cable?  It will be only used in the shack, not mobile.
>
> Dave K8WPE
>
> David J. Wilcox K8WPE’s iPad
> ______________________________________________________________
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[K8TE]

Bob has it right, when used mobile which I do a lot for QSO parties.  Here is
the rationale:

The pictorial at right is from this author's May 2015, QST, starting on page
35, entitled The Modern Mobile. It clearly represents the correct wiring
scenario, whereas the negative lead goes to the same chassis grounding point
as the battery's chassis ground point. And as shown, the negative lead fuse
should not be removed. The reason is, if the grounding point should lose its
integrity, excessive current could flow through the transceiver's negative
lead. It also prevents a minor ground loop between the leads.

You can find more details at:  http://www.k0bg.com/wiring.html.

And hello Dave!  I saw some of our Cherryland ARC friends at HamVention
again this year.

73, Bill, K8TE



--
Sent from: http://elecraft.365791.n2.nabble.com/
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[Elecraft mailing list]

Thank you everyone who responded.  My “new” K3 is now sitting in the place of honor next to my old favorite K2.  Now to read all the volumes of K3 manuals (for all the included upgrades) by Elecraft and the late Fred Cady to find out what all the knobs and buttons do.

Yes, Hi Bill.  Was great to see you again after all these years.

Dave K8WPE since 1960

David J. Wilcox K8WPE’s iPad

> On Jul 1, 2019, at 2:29 PM, K8TE <[hidden email]> wrote:
>
> Bob has it right, when used mobile which I do a lot for QSO parties.  Here is
> the rationale:
>
> The pictorial at right is from this author's May 2015, QST, starting on page
> 35, entitled The Modern Mobile. It clearly represents the correct wiring
> scenario, whereas the negative lead goes to the same chassis grounding point
> as the battery's chassis ground point. And as shown, the negative lead fuse
> should not be removed. The reason is, if the grounding point should lose its
> integrity, excessive current could flow through the transceiver's negative
> lead. It also prevents a minor ground loop between the leads.
>
> You can find more details at:  http://www.k0bg.com/wiring.html.
>
> And hello Dave!  I saw some of our Cherryland ARC friends at HamVention
> again this year.
>
> 73, Bill, K8TE
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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