Building a K1 no side tone
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Assembling my K1 and got to the part where I check the side tone and all. No side tone in the ear buds. I also noticed that when I key the keyer the display goes blank. Not sure why no side tone. Checked the schematic and it goes back to the MCU. Could I of missed something? I have an illuminated display and this stays lit. I would appreciate any help.
Thanks Rick / WA6ES |
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Rick,
Did you install either RFC8 or the jumper that takes its place when the 80 meter band module is not included? See the errata sheet, item 3. 73, Don W3FPR Rick/WA6ES wrote: > Assembling my K1 and got to the part where I check the side tone and all. No > side tone in the ear buds. I also noticed that when I key the keyer the > display goes blank. Not sure why no side tone. Checked the schematic and it > goes back to the MCU. Could I of missed something? I have an illuminated > display and this stays lit. I would appreciate any help. > > Thanks > Rick / WA6ES > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Rick/WA6ES
Rick,
An additional thought - that blank display when keyed could be an indicator of a bad solder connection in the DC supply section of the K1. You are apparently capable of searching through the schematic, so start at the 12 volt input and check all the points up through the regulators for good solder connections. Re-flow those connections with a hot (750 deg F) soldering iron and see if you find any improvement. My guess, one or more of the voltages is reading fine in receive, but the higher current draw when the key is depressed (transmit mode) is causing one of the voltages to sag to less than normal - a bad solder connection could cause that. 73, Don W3FPR Rick/WA6ES wrote: > Assembling my K1 and got to the part where I check the side tone and all. No > side tone in the ear buds. I also noticed that when I key the keyer the > display goes blank. Not sure why no side tone. Checked the schematic and it > goes back to the MCU. Could I of missed something? I have an illuminated > display and this stays lit. I would appreciate any help. > > Thanks > Rick / WA6ES > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I should of said I am on Page 36 of the Alignment and Test Part 1 so I think that there is no output, I will check the board anyway, you never know. At first I did find some points not soldered and took care of them. Still checking and killing brain cells.
Not sure if the display goes blank when you are transmitting or still displays the frequency that you are on. I was thinking ground or short but the backlight stayed on. Rick/WA6ES
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Rick,
The K1 display changes to a simulated bargraph to indicate the power output when keyed. You will not have any power output at this stage of assembly, so your statement of a 'blank display' may be just fine. Since the backlight stays on during keying, I should retract my statement about a power problem. The most likely reason for no sidetone is soldering - check to see if all points are well soldered and none skipped. You do have the AF Gain advanced do you not? The K1 sidetone varies with the AF Gain setting. The source of the sidetone is the output from the DAC on the Front Panel, U2 pin 1. If you have an oscilloscope, you could check to see if you have an audio signal there when the K1 is keyed. Lacking a 'scope, connect a pair of leads to an audio amplifier input (line in of a computer soundcard or an MP3/CD player) and probe at that point to see if there is any sound - it might not sound great, but you will know if the signal is present. The signal leaves the front panel via J1 pin 5. Look at the schematic for the RF Board sheet 1 in the lower left corner and you will see the components that the sidetone signal (XFIL/TONE) are applied to. It makes it way to the AF Amp through the AF Gain control. You should hear some 'white noise' sound when the AF Gain is advanced. If the audio is totally silent, you may have a problem with the AF Amp rather than the sidetone. 73, Don W3FPR Rick/WA6ES wrote: > I should of said I am on Page 36 of the Alignment and Test Part 1 so I think > that there is no output, I will check the board anyway, you never know. At > first I did find some points not soldered and took care of them. Still > checking and killing brain cells. > Not sure if the display goes blank when you are transmitting or still > displays the frequency that you are on. I was thinking ground or short but > the backlight stayed on. > > Rick/WA6ES > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Well Don, I went back checked everything, every hole and every solder fleck. Cleaned up pad solder joints and just verified all, did I mention I missed a couple of holes. Plugged in the power and earbuds and I heard noise, tried the keyer and it was making noise, backwards but dits and dahs. I figure the world would switch to left handed being normal, maybe next year.
Anyway now I can say I am off to page 38 and winding that L1. I just have to remember this is my training for making the K2 later this year. With the K2 I will slow it down a notch and read twice before doing anything. Thanks Again Rick/WA6ES
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Rick, that is great news. There is a menu setting to reverse the
paddles for us lefties. 73, Don W3FPR Rick/WA6ES wrote: > Well Don, I went back checked everything, every hole and every solder fleck. > Cleaned up pad solder joints and just verified all, did I mention I missed a > couple of holes. Plugged in the power and earbuds and I heard noise, tried > the keyer and it was making noise, backwards but dits and dahs. I figure the > world would switch to left handed being normal, maybe next year. > Anyway now I can say I am off to page 38 and winding that L1. I just have to > remember this is my training for making the K2 later this year. With the K2 > I will slow it down a notch and read twice before doing anything. > Thanks Again > Rick/WA6ES > > > Don Wilhelm-4 wrote: > >> Rick, >> >> The K1 display changes to a simulated bargraph to indicate the power >> output when keyed. You will not have any power output at this stage of >> assembly, so your statement of a 'blank display' may be just fine. >> Since the backlight stays on during keying, I should retract my >> statement about a power problem. >> >> The most likely reason for no sidetone is soldering - check to see if >> all points are well soldered and none skipped. You do have the AF Gain >> advanced do you not? The K1 sidetone varies with the AF Gain setting. >> The source of the sidetone is the output from the DAC on the Front >> Panel, U2 pin 1. If you have an oscilloscope, you could check to see if >> you have an audio signal there when the K1 is keyed. Lacking a 'scope, >> connect a pair of leads to an audio amplifier input (line in of a >> computer soundcard or an MP3/CD player) and probe at that point to see >> if there is any sound - it might not sound great, but you will know if >> the signal is present. >> The signal leaves the front panel via J1 pin 5. Look at the schematic >> for the RF Board sheet 1 in the lower left corner and you will see the >> components that the sidetone signal (XFIL/TONE) are applied to. It >> makes it way to the AF Amp through the AF Gain control. You should hear >> some 'white noise' sound when the AF Gain is advanced. If the audio is >> totally silent, you may have a problem with the AF Amp rather than the >> sidetone. >> >> 73, >> Don W3FPR >> >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.725 / Virus Database: 270.14.124/2598 - Release Date: 01/03/10 04:41:00 > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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