Re: [Elecraft] KX3 buzz if power up on transverter band
Meant to send this one to Elecraft support, not Elecraft list. Sorry. On Tue, Feb 16, 2021 at 4:10 PM Drew Arnett wrote: > > 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 __ 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
Re: [Elecraft] KX3 buzz if power up on transverter band
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 wrote: > > https://github.com/drewarnett/kx3-firmware-issues/issues/1#issuecomment-765750316 > > On Wed, Jan 13, 2021 at 4:05 AM Drew Arnett 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 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 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 > > > > 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 > > > > > ex
Re: [Elecraft] K3 assembly issue
__ 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
Re: [Elecraft] K3 assembly issue
Thanks Gernot. The RF board was already assembled when I bought the unit - I didn’t do any soldering. I’ve spent two days going through the boards with a fine tooth comb (aka strong magnifier) and I can’t find any solder bridges or poorly seated components. I did wake up with an idea in my head at 3am though, so I have another avenue of attack to try this afternoon. Thanks for the suggestions everyone! I’ll post when I’ve tested my idea. 73 -Adrian KJ7SOY > On Feb 16, 2021, at 7:10 AM, g...@gmx.net wrote: > > The resistance checks are meant to measure at U13 after being placed and > soldered. It is not a component check, but it will check if you have done the > placement and soldering of all the connected stuff correctly. IAW, a > different value could mean you did a mistake somewhere else. Visually inspect > the boards, solder joints etc before you pull out the component. In case you > already did it, then just test the 7808 outside of the board. Put 12V to > Pin1, GND to Pin 2 and check if you get 8V at Pin 3. > > Happy building, > Gernot DF5RF > >> Am 14.02.2021 um 22:32 schrieb KJ7SOY: >> Hi everyone! I’m new to the list and to Elecraft radios and HAM in general. >> Thanks for bearing with me while I learn! >> I picked up an unassembled K3 at an auction three weeks ago. It’s been >> sitting in a box with most of the boards sealed in their anti-static bags >> since 2009. I’ve hit a snag and I’m hoping someone here can help. >> I have the rev B RF board and I’m doing the manual’s resistance tests. >> Voltage regulators U12 and U13 are both supposed to test at > 150 ohms. U12 >> passes but U13 tests at 87 ohms. This unit has never been powered up so I >> suspect it has to be a bad regulator. I can solder a board just fine and >> assemble PCB’s but I’m not overly comfortable with hardware debugging. I’ve >> removed the side cover and checked for loose boards, bad connections, etc. >> with no success. Anyone have any ideas how I should proceed? Do I just >> replace the regulator? Do some other debugging? >> Thanks! >> 73 >> -Adrian >> KJ7SOY >> __ >> 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 g...@gmx.net > > __ > 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 kj7...@gmail.com __ 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
Re: [Elecraft] K3 assembly issue
The resistance checks are meant to measure at U13 after being placed and soldered. It is not a component check, but it will check if you have done the placement and soldering of all the connected stuff correctly. IAW, a different value could mean you did a mistake somewhere else. Visually inspect the boards, solder joints etc before you pull out the component. In case you already did it, then just test the 7808 outside of the board. Put 12V to Pin1, GND to Pin 2 and check if you get 8V at Pin 3. Happy building, Gernot DF5RF Am 14.02.2021 um 22:32 schrieb KJ7SOY: Hi everyone! I’m new to the list and to Elecraft radios and HAM in general. Thanks for bearing with me while I learn! I picked up an unassembled K3 at an auction three weeks ago. It’s been sitting in a box with most of the boards sealed in their anti-static bags since 2009. I’ve hit a snag and I’m hoping someone here can help. I have the rev B RF board and I’m doing the manual’s resistance tests. Voltage regulators U12 and U13 are both supposed to test at > 150 ohms. U12 passes but U13 tests at 87 ohms. This unit has never been powered up so I suspect it has to be a bad regulator. I can solder a board just fine and assemble PCB’s but I’m not overly comfortable with hardware debugging. I’ve removed the side cover and checked for loose boards, bad connections, etc. with no success. Anyone have any ideas how I should proceed? Do I just replace the regulator? Do some other debugging? Thanks! 73 -Adrian KJ7SOY __ 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 g...@gmx.net __ 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
[Elecraft] KAF2/DSP swap in UK
Anyone in the UK fancy swapping your KAF2 for my DSP board? I am focussing my K2 on CW and the KAF2 would be better for me. The board is fully built and functioning. 73 Ian __ 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
