Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit power.
I've read the errata but missed this information Once done, I need to realigne the receiver and the transmitter on all the bands I think ? Once more Don, thanks a lot ! De : Don Wilhelm Envoyé : dimanche 7 juin 2020 20:05 À : Christophe GIBERT ; Elecraft Support ; elecraft@mailman.qth.net Objet : Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit power. Chris, Remove the red ones from C21 and C23, and put the yellow ones in those positions. The red ones go at C44 and C46. That is indicated in the errata pages. You should read the errata and mark the changes in the manual. Yes, I realize that the manual states that C21 and C23 have a red marking, but that was long ago before the trimmers were changed. Now the errata is the only correct source of the latest information. 73, Don W3FPR On 6/7/2020 1:29 PM, Christophe GIBERT wrote: > Thanks Don for the quick answer! > > L12 and 13 have the narrow slug adjustment slot. > C43 and C47 are 33pF > C42 and C48 are 330 PF > > C44 and C46 are yellow. Like C32 and C34. But C21 and C23 are red ... > Should C21 and C23 been yellow and C44 and 46 red ? > > -- > Chris > > *De :* Don Wilhelm > *Envoyé :* dimanche 7 juin 2020 19:12 > *À :* Christophe GIBERT ; Elecraft Support > ; elecraft@mailman.qth.net > > *Objet :* Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit > power. > Chris, > > Yes, the bandpass filter seems to be the problem. > Do you have the correct inductors at L12 and L13 - they should have a > narrow slug adjustment slot. > Are the capacitors C43 and C47 actually 33 pF (marked either "33" or > "330"). > Are capacitors C42 and C48 actually 330 pF (marked "331"). > > Are you able to tune 12 meters? The trimmers at C44 and C46 should have > red bodies. > > 73, > Don W3FPR > > On 6/7/2020 12:55 PM, Christophe GIBERT wrote: > > Hi Don, I've made some troubleshooting today. > > > > Without the KAT2, I've got no power on 10 meters. > > > > Visually all is good at bandpass filter for 10/12 meters. I've remade > > some joints but the problem remains. > > > > With the troubleshooting of page 14, here are the values : > > > > U10 pin 4 : 0.012 Vrms > > U9 pin 6 : 0.293 Vrms > > W6 : 0 or near 0 V > > So in S1 anode : 0 V or near... It seems to incriminate the bandpass > > filter or am I wrong ? > > > > Please tell ... > > > > Thanks a lot. > > > > -- > > Chris > > > > *De :* Don Wilhelm > > *Envoyé :* jeudi 4 juin 2020 17:34 > > *À :* Christophe GIBERT ; Elecraft Support > > ; elecraft@mailman.qth.net > > > > *Objet :* Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit > > power. > > Chris, > > > > The LoP message indicates that there is not enough power to tune the > KAT2. > > > > As your first troubleshooting test, unplug the KAT2 (both cables) and > > try again - connect a dummy load to the lower BNC jack on the base K2. > > > > See if you get power output on 10 meters. If not, look carefully at the > > bandpass filter for 10/12 meters. > > > > If the bandpass filter is OK, then you will have to do Transmit Signal > > Tracing. Build the RF Probe if you have not already done that and turn > > to the Troubleshooting appendix in the manual. Do the troubleshooting > > on page 14. Use 10 meters instead of 40 meters, and tell me at which > > point the RF voltage is significantly (more than 10%) less than the > > expected voltage. > > > > 73, > > Don W3FPR > > > > On 6/4/2020 9:59 AM, Christophe GIBERT wrote: > > > Hi folks, I'm done in the building of my #7855 K2 and his KAT2. > > > > > > I've got a problem on 10 meters. > > > > > > For example I put the VFO on 28 360 Khz and I press down TUNE, to > tune. > > > > > > The screen shows a "Low P" message. When I try to transmit on this > > band, where is no power at all, the S Meter not move at all. (Problem > > with my antenna connected even with a good 50 ohms dummy load). All is > > good on the other bands. > > > > > > My K2 is KAT2 and KSB2 equiped. > > > > > > Some idea on where investigate ? > __ 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] K2 showing Lo P on 10 meters, and no transmit power.
Thanks Don for the quick answer! L12 and 13 have the narrow slug adjustment slot. C43 and C47 are 33pF C42 and C48 are 330 PF C44 and C46 are yellow. Like C32 and C34. But C21 and C23 are red ... Should C21 and C23 been yellow and C44 and 46 red ? -- Chris De : Don Wilhelm Envoyé : dimanche 7 juin 2020 19:12 À : Christophe GIBERT ; Elecraft Support ; elecraft@mailman.qth.net Objet : Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit power. Chris, Yes, the bandpass filter seems to be the problem. Do you have the correct inductors at L12 and L13 - they should have a narrow slug adjustment slot. Are the capacitors C43 and C47 actually 33 pF (marked either "33" or "330"). Are capacitors C42 and C48 actually 330 pF (marked "331"). Are you able to tune 12 meters? The trimmers at C44 and C46 should have red bodies. 73, Don W3FPR On 6/7/2020 12:55 PM, Christophe GIBERT wrote: > Hi Don, I've made some troubleshooting today. > > Without the KAT2, I've got no power on 10 meters. > > Visually all is good at bandpass filter for 10/12 meters. I've remade > some joints but the problem remains. > > With the troubleshooting of page 14, here are the values : > > U10 pin 4 : 0.012 Vrms > U9 pin 6 : 0.293 Vrms > W6 : 0 or near 0 V > So in S1 anode : 0 V or near... It seems to incriminate the bandpass > filter or am I wrong ? > > Please tell ... > > Thanks a lot. > > -- > Chris > -------- > *De :* Don Wilhelm > *Envoyé :* jeudi 4 juin 2020 17:34 > *À :* Christophe GIBERT ; Elecraft Support > ; elecraft@mailman.qth.net > > *Objet :* Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit > power. > Chris, > > The LoP message indicates that there is not enough power to tune the KAT2. > > As your first troubleshooting test, unplug the KAT2 (both cables) and > try again - connect a dummy load to the lower BNC jack on the base K2. > > See if you get power output on 10 meters. If not, look carefully at the > bandpass filter for 10/12 meters. > > If the bandpass filter is OK, then you will have to do Transmit Signal > Tracing. Build the RF Probe if you have not already done that and turn > to the Troubleshooting appendix in the manual. Do the troubleshooting > on page 14. Use 10 meters instead of 40 meters, and tell me at which > point the RF voltage is significantly (more than 10%) less than the > expected voltage. > > 73, > Don W3FPR > > On 6/4/2020 9:59 AM, Christophe GIBERT wrote: > > Hi folks, I'm done in the building of my #7855 K2 and his KAT2. > > > > I've got a problem on 10 meters. > > > > For example I put the VFO on 28 360 Khz and I press down TUNE, to tune. > > > > The screen shows a "Low P" message. When I try to transmit on this > band, where is no power at all, the S Meter not move at all. (Problem > with my antenna connected even with a good 50 ohms dummy load). All is > good on the other bands. > > > > My K2 is KAT2 and KSB2 equiped. > > > > Some idea on where investigate ? __ 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] K2 showing Lo P on 10 meters, and no transmit power.
Hi Don, I've made some troubleshooting today. Without the KAT2, I've got no power on 10 meters. Visually all is good at bandpass filter for 10/12 meters. I've remade some joints but the problem remains. With the troubleshooting of page 14, here are the values : U10 pin 4 : 0.012 Vrms U9 pin 6 : 0.293 Vrms W6 : 0 or near 0 V So in S1 anode : 0 V or near... It seems to incriminate the bandpass filter or am I wrong ? Please tell ... Thanks a lot. -- Chris De : Don Wilhelm Envoyé : jeudi 4 juin 2020 17:34 À : Christophe GIBERT ; Elecraft Support ; elecraft@mailman.qth.net Objet : Re: [Elecraft] K2 showing Lo P on 10 meters, and no transmit power. Chris, The LoP message indicates that there is not enough power to tune the KAT2. As your first troubleshooting test, unplug the KAT2 (both cables) and try again - connect a dummy load to the lower BNC jack on the base K2. See if you get power output on 10 meters. If not, look carefully at the bandpass filter for 10/12 meters. If the bandpass filter is OK, then you will have to do Transmit Signal Tracing. Build the RF Probe if you have not already done that and turn to the Troubleshooting appendix in the manual. Do the troubleshooting on page 14. Use 10 meters instead of 40 meters, and tell me at which point the RF voltage is significantly (more than 10%) less than the expected voltage. 73, Don W3FPR On 6/4/2020 9:59 AM, Christophe GIBERT wrote: > Hi folks, I'm done in the building of my #7855 K2 and his KAT2. > > I've got a problem on 10 meters. > > For example I put the VFO on 28 360 Khz and I press down TUNE, to tune. > > The screen shows a "Low P" message. When I try to transmit on this band, > where is no power at all, the S Meter not move at all. (Problem with my > antenna connected even with a good 50 ohms dummy load). All is good on the > other bands. > > My K2 is KAT2 and KSB2 equiped. > > Some idea on where investigate ? __ 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] K2 showing Lo P on 10 meters, and no transmit power.
Hi folks, I'm done in the building of my #7855 K2 and his KAT2. I've got a problem on 10 meters. For example I put the VFO on 28 360 Khz and I press down TUNE, to tune. The screen shows a "Low P" message. When I try to transmit on this band, where is no power at all, the S Meter not move at all. (Problem with my antenna connected even with a good 50 ohms dummy load). All is good on the other bands. My K2 is KAT2 and KSB2 equiped. Some idea on where investigate ? -- Chris __ 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] KAT100
Hi all, as the KAT100 is retired, i’m looking for a kit of a KAT100-1 or KAT100-2, or also a buildt one in good condition. (Delivery in France) Thanks. — Chris __ 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] Elecraft K2 7855, alignment and test part II, bad PLL frequency.
Hey ! I’ve soldered a 20pF capacitor that i’d from personal stock between U4 pin 1 and U4 pin 12 (ground), and all is good ! I can go to BFO Test without any problem ! Does this mod could be considered as definitive or should I change Q19 with another J310 ? Thanks a lot for the super hyper quick help! :-) Best regards. — Chris > Le 6 mai 2020 à 23:37, Don Wilhelm a écrit : > > Chris, > > Your English is much better than my French! I hope you can understand the > following: > > You have a Q19 that is not willing to work at the high frequency end of the > PLL range. > > The proper thing to do is replace Q19 with a J310 FET that is better. Order > one from Elecraft (email to supp...@elecraft.com) with the part number. > > What you can try is to add a small value capacitor (12 or 15pF) from U4 pin 1 > to U4 pin 12 (ground) to see if that restores proper function. If you do not > have a stock of small capacitors, use the 12pF in the K2 kit which you have > not yet installed and order a replacement from Elecraft. > > Proper functioning thru-hole J310s have been a problem since Elecraft ran out > of the old ones and found that they had been discontinued by the manufacturer. > > I know of one ham in Europe who used an SMD J310 as a replacement - but if > you consider that, know that the basing is not the same and you would have to > go from the data sheet to know which pin to connect to the holes. He mounted > it on the bottom of the board. > > 73, > Don W3FPR > >> On 5/6/2020 4:44 PM, Christophe GIBERT wrote: >> Hi! First of all, sorry for my poor english, i’m french ;-) >> I’m building my k2 number 7855. >> In the first step of the 4mhz oscillator calibration, i get a frequency of >> 00500.00 instead of 12090.00 >> When i press BAND + : 00475.00 and BAND - : 12085.43 (stable). >> I’ve tested probe on TP2, I’d 4913.52 >> I reviewed all components in the pll schematics and nothing seems wrong. >> Please help me, i don’t know what to look for now. >> Thanks a lot. >> — >> Chris >> __ >> 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 donw...@embarqmail.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
[Elecraft] Elecraft K2 7855, alignment and test part II, bad PLL frequency.
Hi! First of all, sorry for my poor english, i’m french ;-) I’m building my k2 number 7855. In the first step of the 4mhz oscillator calibration, i get a frequency of 00500.00 instead of 12090.00 When i press BAND + : 00475.00 and BAND - : 12085.43 (stable). I’ve tested probe on TP2, I’d 4913.52 I reviewed all components in the pll schematics and nothing seems wrong. Please help me, i don’t know what to look for now. Thanks a lot. — Chris __ 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
