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P3 grounding lug?

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Jim AB3CV

P3 grounding lug?

I'm chasing noise in my headphones. I've noticed that turning off the P3
lowers the noise and I noticed there isn't a bonding point on the back of
the case.

How have others bonded the P3?

jim ab3cv
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Johnny Siu

P3 grounding lug?

Hello Jim,

Did you replace the coaxial jumper between the P3 and K3 with a new one (with proper shielding) ? Some of the jumpers supplied by elecraft are defective (or not up to standard).

73

Johnny VR2XMC

________________________________
寄件人︰ Jim Miller <[hidden email]>
收件人︰ Elecraft Reflector <[hidden email]>
傳送日期︰ 2014年09月3日 (週三) 7:58 AM
主題︰ [Elecraft] P3 grounding lug?

I'm chasing noise in my headphones. I've noticed that turning off the P3
lowers the noise and I noticed there isn't a bonding point on the back of
the case.

How have others bonded the P3?

jim ab3cv
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Jim AB3CV

Re: P3 grounding lug?

Replaced the coax cable a long time ago when the P3 was acting up. That's
not the problem right now.

Actually I now have everything disconnected from the K3 and I'm still
getting some audio noise. I suspect I've got pickup some computer equipment.

Working on that now.

Still would like to bond the P3.

jim

On Tue, Sep 2, 2014 at 8:12 PM, Johnny Siu <[hidden email]> wrote:

> Hello Jim,
>
> Did you replace the coaxial jumper between the P3 and K3 with a new one
> (with proper shielding) ? Some of the jumpers supplied by elecraft are
> defective (or not up to standard).
>
> 73
>
> Johnny VR2XMC
>
> ------------------------------
> *寄件人︰* Jim Miller <[hidden email]>
> *收件人︰* Elecraft Reflector <[hidden email]>
> *傳送日期︰* 2014年09月3日 (週三) 7:58 AM
> *主題︰* [Elecraft] P3 grounding lug?
>
> I'm chasing noise in my headphones. I've noticed that turning off the P3
> lowers the noise and I noticed there isn't a bonding point on the back of
> the case.
>
> How have others bonded the P3?
>
> jim ab3cv
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>
>
>

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Don Wilhelm-4

Re: P3 grounding lug?

Jim,

Remove any convenient screw and put an internal tooth
#4 solder lug under it to serve as a bonding point for the P3 enclosure.

Jim, K9YC will likely point out the "pin 1" problems and may offer
additional suggestions.

73,
Don W3FPR

On 9/2/2014 8:16 PM, Jim Miller wrote:
> Still would like to bond the P3.
>
>

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Jim AB3CV

Re: P3 grounding lug?

Don

Thanks!

jim

On Tue, Sep 2, 2014 at 8:33 PM, Don Wilhelm <[hidden email]> wrote:

> Jim,
>
> Remove any convenient screw and put an internal tooth
> #4 solder lug under it to serve as a bonding point for the P3 enclosure.
>
> Jim, K9YC will likely point out the "pin 1" problems and may offer
> additional suggestions.
>
> 73,
> Don W3FPR
>
>
> On 9/2/2014 8:16 PM, Jim Miller wrote:
>
>> Still would like to bond the P3.
>>
>>
>>
>
>

Jim Brown-10

Re: P3 grounding lug?

In reply to this post by Jim AB3CV

On Tue,9/2/2014 4:58 PM, Jim Miller wrote:
> How have others bonded the P3?

I've never bonded the P3. I do use serial cables that bond connector
shell to connector shell between computer and P3, and I don't use the
BNC cables that Elecraft provides. As others have noted, there have been
problems with their BNC cables. My first (of three) P3s came with an
open BNC cable.

I have very little negative to say about the K3, EXCEPT for their
treatment of cable shields (The Pin One Problem). The ONLY proper
termination of a cable shield is the shielding enclosure (the chassis).
Elecraft fails to do this on most of the audio and control lines, and
this sort of construction error is a common cause of hum, buzz, and RFI.

73, Jim K9YC
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