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P3 hash

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Gene Trasti

P3 hash

Thanks to all that responded. The problem was indeed the BNC cable provided by Elecraft. Wish I had posted my problem a little sooner-I would have saved a lot of time and effort. Once it was drawn to my attention I noticed that the BNC connectors on the cables provided by Elecraft had a loose fit on the K3 and P3. I Used an older cable out of my junk drawer, the BNC connectors had a tighter fit and the hash on the P3 cleaned up instantly.

Gene w6jmp

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Jim

Re: P3 Hash

Gene (and all)---So, what does your baseline look like on P3 now? Certainly it is not flat (or is it?), but mine was so ugly that I moved it down off the screen...hmmm, might be time to try a different bnc cable. My radio isn't set up at the moment as I remod my shack, but I remember hearing signals that were too small to be seen in the grass. Thanks, Jim WN8A
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rowland

Re: P3 Hash

I'm not sure what you're asking but I'll give you an answer anyway. It
may not have been entirely clear what Gene and I saw on our P3 that
turned out to be a problem fixed by a different BNC cable. On my P3 the
BNC connector problem caused signals to be presented on the P3 display
that could not have been present at the antenna. The P3 showed two bands
of increased noise floor that were each roughly 38 kHz wide. One was 62
kHz above center freq and the other was 62 kHz below center freq. These
noise bands were always present, regardless of operating band or center
freq, with the same width and at the same distance from the center freq.
If you're seeing signals invariant of the center freq then try a
different BNC cable. If that doesn't help take a close look at the BNC
receptacle on the P3 to see if it is damaged.

On 8/18/2012 9:45 AM, Jim LeFevre wrote:

> Gene (and all)---So, what does your baseline look like on P3 now? Certainly it is not flat (or is it?), but mine was so ugly that I moved it down off the screen...hmmm, might be time to try a different bnc cable. My radio isn't set up at the moment as I remod my shack, but I remember hearing signals that were too small to be seen in the grass. Thanks, Jim WN8A
> ______________________________________________________________
> Elecraft mailing list
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>
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Todd - k1tm

Re: P3 Hash

rowland wrote

On my P3 the BNC connector problem caused signals to be presented on the P3 display
that could not have been present at the antenna. The P3 showed two bands
of increased noise floor that were each roughly 38 kHz wide. One was 62
kHz above center freq and the other was 62 kHz below center freq. These
noise bands were always present, regardless of operating band or center
freq, with the same width and at the same distance from the center freq.
If you're seeing signals invariant of the center freq then try a
different BNC cable."

I had the same issue as you describe, and fixed it by swapping to another cable. The
poor connection was at the P3 side of the cable. Once swapped out, I also found that
my USB sound card was radiating a lot of noise as well. I had to both swap cables and
unplug the sound system to get to a nice flat display.

Jack Berry

Re: P3 Hash

When you say "flat display", do you mean no "grass"? Just a flat line?

Thanks!
Jack

On Aug 20, 2012, at 1:30 PM, k1tm <[hidden email]> wrote:

>
> rowland wrote
>>
>> On my P3 the BNC connector problem caused signals to be presented on the
>> P3 display
>> that could not have been present at the antenna. The P3 showed two bands
>> of increased noise floor that were each roughly 38 kHz wide. One was 62
>> kHz above center freq and the other was 62 kHz below center freq. These
>> noise bands were always present, regardless of operating band or center
>> freq, with the same width and at the same distance from the center freq.
>> If you're seeing signals invariant of the center freq then try a
>> different BNC cable."
>>
>
> I had the same issue as you describe, and fixed it by swapping to another
> cable. The
> poor connection was at the P3 side of the cable. Once swapped out, I also
> found that
> my USB sound card was radiating a lot of noise as well. I had to both swap
> cables and
> unplug the sound system to get to a nice flat display.
>
>

Todd - k1tm

Re: P3 Hash

I meant the grass lies along a flat line. My sound card produces 5 to 10 khz wide humps in various places in a several bands. I wish the grass would approach a flat line, but alas I live in town and pretty much everything with a current running through it produces noise of some kind, even if it just thermal noise.

Todd.

Bob - W6OPO

Re: P3 Hash

The baseline on my P3 is ugly but only a move out of silicon valley will will fix that.

Bob - W6OPO