[Elecraft] P3 help requested...

[Dave (NK7Z)]

Morning,

I had a P3 failure back in December, and sent in P3, (serial number 
3155), to Elecraft for repair.

While 3155 was in for repair, I purchased locally a second P3 to use in 
P3, 3155's place, and have been using it with no issues.

P3, 3155 arrived back to my home about a month ago, and I am now getting 
around to testing it out.

I just took P3, (3155), (the one Elecraft had just repaired), out of the 
shipping box for the first time, and inserted it in place of the working 
P3, serial 2037.

I get a waterfall, just a noise floor, and I get a trace.  Again, just 
noise floor.  It appears working in all other aspects.

I have recovered from a back up of 3155, (taken before it failed 
completely), and that brought back the settings etc., but I still have 
no signal on the trace of the just repaired P3.

I then swapped back in the P3 I purchased to use while 3155 was in 
service, and it works fine...

This tells me that the P3 wiring between the K3 and the P3, are 
connected correctly, and that the K3 settings are correct to drive a P3.

I swapped back in the just repaired P3, (3155), and again, no signals, 
just a noise floor.

So it is either a problem in my setup of the just repaired P3, 
(probably), or a failed repair by Elecraft.  I am trying to triage this 
prior to contacting Elecraft, in the hopes it is my issue.    My guess 
is some sort of setup problem, as Elecraft repair has always been good...

Can someone suggest what setting(s) I might further check?  I looked at 
the radio definition, and all setting there are the same as the working 
P3...  I suspected IF frequency might be set wrong on the just repaired 
P3, but it appears to match the working P3.

I also checked most of the obvious settings that might cause an issue, 
but can find nothing...  It just looks like I have no IF input to the 
just repaired P3.

Any ideas where else I might check on the failed P3?  I am being very 
careful to make ZERO changes to the K3, as it drives P3 number 2037 fine.

-- 
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources