[Elecraft] P3 - Power up glitches with K3

[Alan Bloom]

Hi Phil,

It does take several seconds for the K3 to initialize the P3 at power up
but if some parameters are not getting initialized it must be a hardware
problem with the serial interface.  It sounds like you have already
confirmed that the locking screws on both ends of the serial cable are
tight.  If you have a spare cable you might try that.  Another
possibility is a bad KIO3 board in the K3.  Some units have a marginal
negative power supply that can affect signal integrity.  If you can
borrow another K3, you could temporarily substitute it to tell if the
problem is with the K3 or P3.

I would contact Elecraft support to see what they recommend.
k3support at elecraft.com

Alan N1AL



On Fri, 2011-12-23 at 17:40 -0800, Phil Westover wrote:
> I've got a P3 connected to my K3 with all the proper connections.  
> 
> K3 info:
> s/n 1206
> Firmware:  MCU 4.36, DSP 2.73, Flash Parameters 1.14
> P3 info:
> s/n 1490
> Firmware:  1.09 
> 
> When I first hooked up the P3 a few months ago, I set the jumpers (and
> connected a power cable) to power it up from the K3.  At that time, I got
> immediate connection and immediate "talking" between the P3 and the K3. 
> Frequency and filter width showed up correctly immediately at power up.  
> 
> After a couple of months, it appears to not immediately 'talk' with the K3
> upon power up.  Sometimes no frequency nor filter bandwidth are displayed. 
> Sometimes frequency is displayed, but no filter bandwidth. Sometimes the
> bandwidth shows up and is shifted off the right.  In all cases, I can
> manually power down the P3 and toggle it back up, and all those things
> eventually show up properly.  Sometimes it takes several on-off toggles (5
> or more).  In one instance, it didn't come up after several toggles, then
> about 10 minutes later they started talking correctly.
> 
> Cables are tightly attached.  There is no movement to the rigs during use. 
> This appears to be software related, not mechanical.
> 
> Ideas?
> 
> - Phil, WA7URV
> 
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