[Elecraft] P3 Hash

[Rowland R Johnson]

I took a close look and the BNC on the P3 and the center conductor 
either was faulty to begin with or was damaged by the male BNC being 
misaligned. My old cable still fits without any difficulty. I'm 
supposing that, although it's not certain, it's likely that this caused 
the hash seen on the P3.

Anyway, Howard at Elecraft is sending a replacement board that has the 
damaged BNC receptacle.


On 8/17/2012 11:02 AM, Jack Smith wrote:
> Some Chinese BNC male connectors don't properly mate with a
> dimensionally correct BNC female.
>
> Not sure where the dimensional problem is, but I've run into the problem
> more than once.
>
> Jack K8ZOA
>
> On 8/17/2012 1:15 PM, Rowland R Johnson wrote:
>> I had the same problem. Replacing the BNC coax cable (between the P3 and
>> K3) with one I had lying around fixed it. Howard at Elecraft tech
>> support then sent a new cable that arrived 36 hours after I talked to
>> him. This new cable from Elecraft worked fine, for a while, but then
>> started having the same kinds of problems. I put my old cable that I had
>> lying around back on and it's worked for several months now.
>>
>> I haven't pursued getting a second replacement from Elecraft because it
>> hardly seems worthwhile. In addition, it's not 100% clear to me that the
>> problem is the cable. With the 2 Elecraft cables I've noticed some
>> difficulty in connecting the BNC plug to the BNC receptacle on the back
>> of the P3. Not so with my old cable. The supposition being that the
>> physical dimensions of BNC receptacle on the P3 aren't quite right.
>> Whereas the new cables have a problem fitting, my old cable may be worn
>> enough that it fits anyway.
>>
>>
>> On 8/17/2012 9:00 AM, Gene Trasti wrote:
>>>> P3 with svga
>>>>
>>>> I have a considerable amount of "hash" on my panadapter screen.  It tracks the same spot on all bands.  All my equipment is very well grounded.  I have measured my shack for RFI-it is very clean.  I swapped out my switching power supply for a highly filtered one.  I even purchased a pretty expensive ac terminal strip with isolation transformers.  I have been through the house and have virtually switched off and unplugged everything-nothing seems to help.  This hash takes up a pretty healthy portion of the bandwidth.  Any sugestions would be appreciated.  Is it possible that this could be a problem with the P3 or K3 they are both factory built-although I added the svga board using a wrist ground..
>>>>
>>>>
>>>> Gene. W6jmp
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-- 
Rowland R Johnson
rowland at lascanadas.org

www.lascanadas.org
House 805-438-3673
Cell 805-305-5252
Fax 805-438-4970