[Elecraft] P3 Spurii and a cure.

[Tom]

So a Pasterack bnc male to bnc male using 24" of RG58 is 23.90 + shipping 
Not so bad if it fixes the problem.
Is it supposed to be rg58?
Thanks 

Sent from my iPhone

On 2013-08-27, at 12:31 PM, George Danner <gdanner at windstream.net> wrote:

> Tom,
> Try Pasternack or Bracke.
> 
> I've used their patch cables from audio up to 18 GHz. Both manufacture have 
> quality components & assembly. Prepare yourself for sticker shock! Quality 
> does cost.
> 
> For my P3, I made my jumper with a piece of old RG-58 and double crimp BNC 
> connectors. That solved my issue. As an early P3 user (first group of kits), 
> the issue was not yet identified. During my experimenting others had found 
> the solution. My experimenting indicated there was a ground loop due to poor 
> shield connections. The Elecraft cable was crimped to a foil/braid shield.
> 
> BTW - Poor full shield connections were an issue identified many years ago 
> in broadcasting when we switched from UHF connectors to BNC connectors. The 
> full shield coax that used a foil were (are) especially prone to ground 
> loops by not having a good connection at both connectors. I'm sure there is 
> a way to use this cable with BNCs, but we were never successful. We quite 
> using foil coax & non-crimped shields about 30 years ago. Analog video in a 
> broadcast plant needs to pass DC to at least 6 MHz.
> 
> 73
> George
> AI4VZ
> 
> 
> -----Original Message----- 
> From: Tom
> Sent: Tuesday, August 27, 2013 12:06 PM
> To: Bill
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] P3 Spurii and a cure.
> 
> Huh, I just noticed I have them too.
> So, given that regular cables don't always remove these, how does one build 
> a mil-spec bnc cable?
> Tom
> 
> Sent from my iPhone
> 
> On 2013-08-27, at 9:43 AM, Bill <bill at w2blc.net> wrote:
> 
>> Regarding the hump monster appearing on the screen of the P3:
>> 
>> I had this to a severe degree with my P3 when I first put it into service. 
>> Here are the results of my quick tests:
>> 
>> 1. humps vanish when the P3 has no patch cord attached to it.
>> 2. using a different BNC patch cord from the P3 to the K3 caused the humps 
>> to vary in intensity:
>>   a. using a 20 year old mil-spec BNC patch cord removed the humps 
>> completely.
>>   b. using a replacement from Elecraft improved the situation with 
>> smaller humps.
>>   c. using a different replacement from Elecraft also reduced the humps.
>> 
>> As a result of the above, I use my 20 year old mil-spec BNC patch cord and 
>> am very happy.
>> 
>> Not a big deal to me, it was easily fixed, and I am very happy with my P3.
>> 
>> Bill W2BLC a happy K-line owner
>> 
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