Re: [Elecraft] PX3 Problem?

Good morning all, I read all of the latest suggestions, and they were good ones. I got into the menu and determined that the noise blanker was off, as it should have been. The PX3 seems to be working properly now and the main thing that helped was turning on the preamp in the KX3. I use the

Re: [Elecraft] PX3 Problem?

This comes up quite often, and here is a reply from Wayne about it. You can check your PX3 as follows. > Are you using a PX3 or P3? Assuming it's a PX3, try this: > > - make sure RX I/Q is set to ON (KX3 menu) > - make sure the PX3->KX3 cables are fully seated > - connect an antenna to the KX3 >

Re: [Elecraft] PX3 Problem?

One other thing, have you perhaps got the PX3 Noise Blanker switched on and the PX3 NB level turned up high? That causes spikes at the centre. (I am not referring to the KX3 noise blanker) 73 from David GM4JJJ > On 16 Jul 2017, at 23:06, Dave Sublette wrote: > > I have had my PX3 for a litt

Re: [Elecraft] PX3 Problem?

Hello Dave, Just checked my KX3/PX3 and with no antenna, I am also seeing spur peaks about 25 to 30 dB above the noise floor. With the PX3 SPAN set to 30 KHz: On 20 meters, when I turn the preamp ON (20dB preamp setting), and connect my HexBeam, I only see 20m band noise at about -112 dBm; there

Re: [Elecraft] PX3 Problem?

Using just one of 20 “extra” spurs, I measuredthe spur peak at -90 with the preamp on. Base line is -125 with it on. Turning off the preamp, the peak is -75, base line -112. The s/n remains basically with preamp on and off. The main thing is, Those spurs were not there previously. I just too

Re: [Elecraft] PX3 Problem?

Dave, The KX3 is designed to be operated with the preamp on most of the time. The only reason to turn it off is when extremely strong signals are encountered. The preamp eliminates many spurious signals that are actually out of band due to its signal rejection "filtering". That has nothing

Re: [Elecraft] PX3 Problem?

Good point. However I am on 20 meters, which really doesn’t need the preamp. Besides, the spikes are 40 dB high or so. No, this behavior is definitely looking like a failure. I have one more thing to try. I will carry it out to the shop in my garage and plug it in. If it is the same there

Re: [Elecraft] PX3 Problem?

Dave, make sure that the preamp is engaged on your KX3. If the preamp is off and you are receiving on a quiet band, you'll see "stuff" that would normally be covered by the band noise. Turn on the preamp, and the artifacts that you're seeing should be pushed below the noise floor of just about any

Re: [Elecraft] PX3 Problem?

Just out of curiosity, has any other wall wart or other device been plugged in near the px3-kx3 recently? Interestly enough, just this morning I saw new noise I hadn't seen before. It turned out to be a wall wart that was charging a car booster battery pack and it was about 4-5 inches from the k

Re: [Elecraft] PX3 Problem?

Tnx Roger and Matt. Roger — I don’t have the KX3/PX3 interfaced with the audio on the computer. I do have the usb port connected. Matt — I believe it is the 2.5 mm jacks that carry the Rx I/Q between the KX3 and PX3. I unplugged the antenna and the spikes are still there. I unplugged the Rx

Re: [Elecraft] PX3 Problem?

Sounds like a ground loop. I had something similar. I unplugged the KX3 from the computer and it went away. I was able to use an USB hub and it was fine. -- 73 and Thanks, Roger Meadows AE4RM QRP - Do More With Less On July 16, 2017 at 6:06:20 PM, Dave Sublette (k...@arrl.net

Re: [Elecraft] PX3 Problem?

Try unplugging the antenna to see if it's internally- or externally-generated. If the artifacts remain with no antenna, only one of the I/Q signals is making it to the PX3. This may be due to the cable or the KX3 or PX3 3.5mm sockets. Try using a different M-M 3.5mm cable and see if it makes

[Elecraft] PX3 Problem?

I have had my PX3 for a little over a year (I think). It has been used sparingly. Until this afternoon, it has worked perfectly. Now I see a spike in the center of the display and periodic spikes across the entire screen. Almost all are symmetrical in frequency and amplitude about the center

Re: [Elecraft] PX3 Problem

PX3 exhibits narrow S2+ spikes on either side of the notch. Any ideas about that? I have not seen it mentioned in the archives. Ted, KN1CBR Message: 3 Date: Wed, 17 Jun 2015 08:37:37 -0700 From: Alan To: elecraft@mailman.qth.net Subject: Re: [Elecraft] PX3 problem Message-ID: <55819441.8

[Elecraft] PX3 Problem

08:37:37 -0700 >From: Alan >To: elecraft@mailman.qth.net >Subject: Re: [Elecraft] PX3 problem >Message-ID: <55819441.8050...@sonic.net> >Content-Type: text/plain; charset=windows-1252; format=flowe >I think you must be referring to the notch that occurs at the KX3 VFO &

Re: [Elecraft] PX3 problem

I think you must be referring to the notch that occurs at the KX3 VFO frequency. The I/Q output of the KX3 is AC-coupled so there is no response at zero HZ, which corresponds to the KX3 VFO frequency. In CW mode, this is offset from the receive frequency by the CW pitch, typically 600 Hz, eit

Re: [Elecraft] PX3 problem

I have not heard anything from Elecraft about this problem. John K7JLT "Dauer, Edward" wrote: >Just saw your posts in the archives. I am experiencing the same, except that >in my case there are two narrow S2 spikes at either end of the empty gap. Has >anyone at the factory ever commented or