[Elecraft] P3 - Appearent P3 Anomoly

[Alan Bloom]

Hi Don,

The first thing I would check is the ground connections in the chassis.
Make sure that the paint has been removed from the sheet metal on the
inside surface around the BNC and the RS-232 connectors. The mounting
nuts on the BNC connectors and the jack screws on the RS-232 connectors
must be tight.  The connectors on the RS-232 cables should be screwed
down so the connector shells make good contact.

The paint must also be removed from the sheet metal around each of the
points where it attaches to the 2D fasteners.  Also make sure all the
chassis screws are tight.

73,

Alan N1AL



On Tue, 2011-05-03 at 12:26 -0500, Don Wines wrote:
> Guys,
> 
> My P3 has developed a problem that appears to be some internally
> generated noise that shows up on the screen but doesn't come from the
> K3. Below is a link to a video I made this morning for a visual
> description of the problem. After the P3 has warmed up it will
> disappear. It will gradually migrate from right to left (higher to
> lower in freq) and eventually either disappear or go out of range of
> the display. It doesn't to interfere with reception even when the
> signal is within the noise boundary.
> 
> This problem seems to occur on all bands from 40 thru 10 meters. I
> haven't seen it below 40 meters. There is no ground lug on the P3 but
> the K3 itself is well grounded.
> 
> http://www.flickr.com/photos/43690708@N02/5684413732/
> 
> I didn't show it on the video but when the Select knob is turned even
> with no function displayed the noise spreads out over a much wider
> span but then re-concentrates after the knob is left alone.
> 
> The P3 has performed flawlessly up to this point. This problem seems
> to be superficial in that is doesn't otherwise affect the operation of
> the unit.
> 
> Any ideas from anybody especially you guys in Aptos!
> 
> Don Wines
> K5DW
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>