Hi, Thanks for the help with this so far.
A year to resolve this issue is too long. (Dating to the RSA 10333 to repair the TX when the FW was upgraded by you.) I would consider reverting to an earlier version of the firmware. Are there any serious issues with installing older firmware? What version should I install? 02.38/01.37 is what I had installed before RSA 10333. There have been 10 releases since then. RSA 1033 installed 2.90/1.52. 2.95/1.52 2.90/1.52 RSA 1033 2.85/1.52 2.83/1.52 2.82/1.52 2.76/1.50 2.72/1.49 2.70/1.49 2.52/1.37 2.46/1.37 2.38/1.37 orig Should I just go back to 2.38/1.37 or should I try one of the other 8 versions in between? Thanks and best regards, Drew n7da On Fri, Jan 22, 2021 at 11:45 PM Drew Arnett <arnett.d...@gmail.com> wrote: > > https://github.com/drewarnett/kx3-firmware-issues/issues/1#issuecomment-765750316 > > On Wed, Jan 13, 2021 at 4:05 AM Drew Arnett <arnett.d...@gmail.com> wrote: > > > > Elecraft reported that they were able to reproduce the problem before > > the end of October. > > > > Haven't heard anything more, yet. > > > > On Sat, Sep 12, 2020 at 3:51 PM Drew Arnett <arnett.d...@gmail.com> wrote: > > > > > > Anybody have a chance to try this? Would be useful to know if someone > > > else cannot. Would be equally useful to know if someone can. Still > > > waiting to hear back from Elecraft. > > > > > > Thanks, > > > > > > Drew > > > n7da > > > > > > On Fri, Aug 21, 2020 at 3:22 PM Drew Arnett <arnett.d...@gmail.com> wrote: > > > > > > > > Oscilloscope "screenshot" of the offending waveform: > > > > > > > > https://drive.google.com/drive/folders/1-g9Met098lhncAcMtAAOvxWFDjf0NU_w?usp=sharing > > > > > > > > Can anyone try to reproduce this to rule out or confirm my suspicion > > > > it might be caused by firmware bug? > > > > > > > > You can imagine how fast I knocked my headphones off! :-O :-) > > > > > > > > Thanks and best regards, > > > > > > > > Drew > > > > n7da > > > > > > > > On Wed, Aug 19, 2020 at 2:49 PM Drew Arnett <arnett.d...@gmail.com> > > > > wrote: > > > > > > > > > > Hi, > > > > > > > > > > Weird problem. Anyone else try this and do or don't see this? > > > > > > > > > > Just got my KX3 back from repair. This included an upgrade to the > > > > > latest firmware. (Makes sense. Requirement for production test. I > > > > > hadn't upgraded to the very latest, because I had no need for the > > > > > latest improvements.) > > > > > > > > > > Set the radio back up for 10368 to 50 MHz transverter use on XVTR1 > > > > > band. Now, if I power up the radio when it was shut down on the XVTR > > > > > band, there is a crazy loud buzz on the audio output (and > > > > > corresponding response of the S meter.) If I switch to any other > > > > > non-XVTR band and then power up, no problem even if switching then to > > > > > the XVTR band. > > > > > > > > > > FW is now 2.90/1.52I got the radio back just before the 10 GHz > > > > > contest, so only made minimal changes to settings from the cleared > > > > > state it came back in. Changes made: > > > > > AFX mode off (was delay) > > > > > ATU bypass (can't remember if it came back this way or not. XVTR is > > > > > good 50 ohm load.) > > > > > BAT CHG off (was not inst) > > > > > BKLIGHT off (was on) > > > > > MIC BIAS off (I think came back on; used dynamic mic during contest) > > > > > MIC BTN Ptt (was up/down) > > > > > TX DLY 10 (was 5. abundance of caution as 5 is more than enough for > > > > > the 10 GHz rig I'm running) > > > > > XV1 on > > > > > XV1 RF 10368 > > > > > XV1 IF 50 > > > > > XV1 PWR 0.1 > > > > > XV1 OFS (set in field) 1.20 > > > > > XV1 ADR trn1 > > > > > set the clock. :-) > > > > > turned on the hidden in the menus CW-in-SSB feature > > > > > > > > > > I know I turned on or off a couple of front panel things as they left > > > > > it. Don't remember. Stuff like vox, pre, nr or nb. Definitely > > > > > adjusted mic gain and compression and keyer speed. :-) > > > > > > > > > > RX ISO changed to on during the contest, but problem occurs with it > > > > > on or off > > > > > > > > > > What does the headphone jack output look like? Power up in bad state. > > > > > Set volume control to 20. With no load other than 10X scope probe, > > > > > the AC component is identical for left and right. Tip has about 0 V > > > > > DC offset. Ring has about + 0.5 V DC offset. AC component looks like > > > > > a the differential of a square wave. Peak to peak amplitude is 220 > > > > > mV. (This follows volume control. Didn't check to see if DC offset > > > > > follows volume control.) 12.2 millisecond repetition rate for > > > > > positive and negative pulses. Negative pulse leads positive pulse by > > > > > 2.2 ms, so 10 ms from positive pulse to negative. Very small AC > > > > > ripple on that with a period of about 0.4 ms. > > > > > > > > > > I was very happy to find a sequence to avoid the problem (as described > > > > > above.) To trouble shoot, I tried to rule out a number of things. > > > > > Unplugged ALL cables from the KX3. That did not resolve. Tried > > > > > external 12.4 V (battery on hand) and internal battery removed. Tried > > > > > internal battery (charged) and nothing plugged in. No dice. > > > > > > > > > > Given that it's just back from repair, that sequencing gets it in a > > > > > bad state, FW was upgraded to a new version, and audio path goes > > > > > through FW, seems reasonable to ask if this is a known FW issue or if > > > > > someone can try to reproduce this. > > > > > > > > > > Hoping to figure this out before the Sept VHF, the Sept 10 GHz contest > > > > > weekend, and of course the HF contests coming up later this fall. :-) > > > > > With my workaround, I was able to participate in the Aug 10 GHz > > > > > weekend without interruption. I ran a W1GHZ XVTR barefoot (+5 dBm > > > > > Pout) for best DX of 379 km. How much fun can you have with a KX3? > > > > > Lots! :-) > > > > > > > > > > Thanks and best regards, > > > > > > > > > > Drew > > > > > n7da ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
