Re: [Elecraft] KX1 Power Output
Don, I installed the .1 microfarad capacitor at C30, but this didn’t change the output. After testing the C30 fix, I subsequently changed R30 to 33 ohms and R11 to 4.7 ohms. This did change things, but did not entirely resolve the problem. At 13.8V input, my power meter shows 3.0 watts on both 20M and 40M. When I lower the input voltage to 9.0 volts, the meter shows 1.4 watts on 40M and 1.7 watts on 20M. I guess this is within or nearly within specs, but it’s odd that there is more output on 20M than on 40M. Anything else I should try, or should I just use it like this for a while? Thanks again, Lee KG5VU On Jun 17, 2015, at 1:02 PM, Don Wilhelm w3...@embarqmail.com wrote: Lee, Yes, I would change that capacitor - there is a chance that it will increase the output of the DDS and solve your power output problem. There is a difference in some KX1s due to care during construction, component tolerances, and a host of other factors. Make certain you counted the toroid turns correctly - a straight wire through the core is one turn, a full wrap around the core is 2 turns. Count the turns that go through the core center. If all else fails, you can install the KX1 power mod. If you have a good stock of 1/4 watt resistors you may not need to order the kit. Change R11 to 4.7 ohms and R30 to 33 ohms. If those steps do not solve the power output situation, send me an off-list email and we can make comparison measurements with my KX1. The KX1 audio is not 'earbusting', but is normally adequate. Yes, you may want to try headphones or earbuds with a higher SPL rating. The Quick Reference is the only place in the KX1 manual where SLO, SHI, and CAL are mentioned - I guess someone overlooked updating that portion of the manual since the VERY early days of the KX1. Look at the listing of menu items on page 65 and you will see DDS, BFO, and SIG to make those settings. This has been true since firmware rev 1.01. 1.02 is the latest version. 73, Don W3FPR On 6/17/2015 10:58 AM, KG5VU wrote: Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant? __ 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] KX1 Power Output
Lee, Yes, I would change that capacitor - there is a chance that it will increase the output of the DDS and solve your power output problem. There is a difference in some KX1s due to care during construction, component tolerances, and a host of other factors. Make certain you counted the toroid turns correctly - a straight wire through the core is one turn, a full wrap around the core is 2 turns. Count the turns that go through the core center. If all else fails, you can install the KX1 power mod. If you have a good stock of 1/4 watt resistors you may not need to order the kit. Change R11 to 4.7 ohms and R30 to 33 ohms. If those steps do not solve the power output situation, send me an off-list email and we can make comparison measurements with my KX1. The KX1 audio is not 'earbusting', but is normally adequate. Yes, you may want to try headphones or earbuds with a higher SPL rating. The Quick Reference is the only place in the KX1 manual where SLO, SHI, and CAL are mentioned - I guess someone overlooked updating that portion of the manual since the VERY early days of the KX1. Look at the listing of menu items on page 65 and you will see DDS, BFO, and SIG to make those settings. This has been true since firmware rev 1.01. 1.02 is the latest version. 73, Don W3FPR On 6/17/2015 10:58 AM, KG5VU wrote: Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant? __ 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] KX1 Power Output
Correct, Thanks On Jun 17, 2015, at 3:23 PM, ke9uw [via Elecraft] ml-node+s365791n7604072...@n2.nabble.com wrote: You mean a .01 uF? Sent from my iPhone Chuck (Jack) On Jun 17, 2015, at 3:09 PM, KG5VU [via Elecraft] [hidden email] x-msg://9/user/SendEmail.jtp?type=nodenode=7604072i=0 wrote: Don, I installed the .1 microfarad capacitor at C30, but this didn’t change the output. After testing the C30 fix, I subsequently changed R30 to 33 ohms and R11 to 4.7 ohms. This did change things, but did not entirely resolve the problem. At 13.8V input, my power meter shows 3.0 watts on both 20M and 40M. When I lower the input voltage to 9.0 volts, the meter shows 1.4 watts on 40M and 1.7 watts on 20M. I guess this is within or nearly within specs, but it’s odd that there is more output on 20M than on 40M. Anything else I should try, or should I just use it like this for a while? Thanks again, Lee KG5VU On Jun 17, 2015, at 1:02 PM, Don Wilhelm [hidden email] x-msg://9/user/SendEmail.jtp?type=nodenode=7604071i=0 wrote: Lee, Yes, I would change that capacitor - there is a chance that it will increase the output of the DDS and solve your power output problem. There is a difference in some KX1s due to care during construction, component tolerances, and a host of other factors. Make certain you counted the toroid turns correctly - a straight wire through the core is one turn, a full wrap around the core is 2 turns. Count the turns that go through the core center. If all else fails, you can install the KX1 power mod. If you have a good stock of 1/4 watt resistors you may not need to order the kit. Change R11 to 4.7 ohms and R30 to 33 ohms. If those steps do not solve the power output situation, send me an off-list email and we can make comparison measurements with my KX1. The KX1 audio is not 'earbusting', but is normally adequate. Yes, you may want to try headphones or earbuds with a higher SPL rating. The Quick Reference is the only place in the KX1 manual where SLO, SHI, and CAL are mentioned - I guess someone overlooked updating that portion of the manual since the VERY early days of the KX1. Look at the listing of menu items on page 65 and you will see DDS, BFO, and SIG to make those settings. This has been true since firmware rev 1.01. 1.02 is the latest version. 73, Don W3FPR On 6/17/2015 10:58 AM, KG5VU wrote: Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft https://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.qth.net_mailman_listinfo_elecraftd=AwMFaQc=8hUWFZcy2Z-Za5rBPlktOQr=sJF6P5kPtoOq-4ibyL6MxBDxCHbuqOBlbl_K1oh3QFQm=vLL9glvPEFUTQSqhVPEQ4JvH-_d_bCJGumtAFOEcNTks=C9WnM4h4dyT871Ms4SPXbPqcC_1pUD1OSK949HS-f54e= Help: http://mailman.qth.net/mmfaq.htm https://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.qth.net_mmfaq.htmd=AwMFaQc=8hUWFZcy2Z-Za5rBPlktOQr=sJF6P5kPtoOq-4ibyL6MxBDxCHbuqOBlbl_K1oh3QFQm=vLL9glvPEFUTQSqhVPEQ4JvH-_d_bCJGumtAFOEcNTks=uQjNRrbgkYAwcXN8h1z6wU7dEtlrjmz3ZW5Jbgkhd5Ae= Post: mailto:[hidden email] x-msg://9/user/SendEmail.jtp?type=nodenode=7604071i=1 This list hosted by: http://www.qsl.net
Re: [Elecraft] KX1 Power Output
Lee, That is better, but I normally expect 3.5 watts with a true 13.8 volt input. Measure the voltage at the KX1 end (remove the insulating handle from the power cord to gain access). Then try a TUNE and measure the voltage again. If it drops substantially, check the connections at the power source to be sure they are tight. I normally recommend using #18 wire or larger to reduce the voltage drop. You did not mention the wattmeter that you were using. Many analog wattmeters are only accurate to 20% of the full scale reading - that means if using a 20 watt scale, the reading could be incorrect by as much as 4 watts at any point on the scale, making them not reliable for low power work. It is more accurate to connect a god 50 ohm dummy load and measure the RF voltage across that load and 'do the math' to figure the power output. There are a few accurate wattmeters available, and most of them are digital - the Elecraft WM1, W2, or the Telepost LP-100 and LP-200 are ones I know I can trust. You may be able to move the 40/20 power output relationship by changing the spacing on the turns of L1 and L2. Try spreading the turns as well as squeezing them. The most important factor when spreading or squeezing the turns is the spacing between the wires at the ends of the winding - spreading or squeezing the middle of the winding will not do much. 73, Don W3FPR On 6/17/2015 4:08 PM, M L Hooper wrote: Don, I installed the .1 microfarad capacitor at C30, but this didn’t change the output. After testing the C30 fix, I subsequently changed R30 to 33 ohms and R11 to 4.7 ohms. This did change things, but did not entirely resolve the problem. At 13.8V input, my power meter shows 3.0 watts on both 20M and 40M. When I lower the input voltage to 9.0 volts, the meter shows 1.4 watts on 40M and 1.7 watts on 20M. I guess this is within or nearly within specs, but it’s odd that there is more output on 20M than on 40M. Anything else I should try, or should I just use it like this for a while? Thanks again, Lee KG5VU On Jun 17, 2015, at 1:02 PM, Don Wilhelm w3...@embarqmail.com wrote: Lee, Yes, I would change that capacitor - there is a chance that it will increase the output of the DDS and solve your power output problem. There is a difference in some KX1s due to care during construction, component tolerances, and a host of other factors. Make certain you counted the toroid turns correctly - a straight wire through the core is one turn, a full wrap around the core is 2 turns. Count the turns that go through the core center. If all else fails, you can install the KX1 power mod. If you have a good stock of 1/4 watt resistors you may not need to order the kit. Change R11 to 4.7 ohms and R30 to 33 ohms. If those steps do not solve the power output situation, send me an off-list email and we can make comparison measurements with my KX1. The KX1 audio is not 'earbusting', but is normally adequate. Yes, you may want to try headphones or earbuds with a higher SPL rating. The Quick Reference is the only place in the KX1 manual where SLO, SHI, and CAL are mentioned - I guess someone overlooked updating that portion of the manual since the VERY early days of the KX1. Look at the listing of menu items on page 65 and you will see DDS, BFO, and SIG to make those settings. This has been true since firmware rev 1.01. 1.02 is the latest version. 73, Don W3FPR On 6/17/2015 10:58 AM, KG5VU wrote: Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant?
Re: [Elecraft] KX1 Power Output
You mean a .01 uF? Sent from my iPhone Chuck (Jack) On Jun 17, 2015, at 3:09 PM, KG5VU [via Elecraft] ml-node+s365791n7604071...@n2.nabble.commailto:ml-node+s365791n7604071...@n2.nabble.com wrote: Don, I installed the .1 microfarad capacitor at C30, but this didn’t change the output. After testing the C30 fix, I subsequently changed R30 to 33 ohms and R11 to 4.7 ohms. This did change things, but did not entirely resolve the problem. At 13.8V input, my power meter shows 3.0 watts on both 20M and 40M. When I lower the input voltage to 9.0 volts, the meter shows 1.4 watts on 40M and 1.7 watts on 20M. I guess this is within or nearly within specs, but it’s odd that there is more output on 20M than on 40M. Anything else I should try, or should I just use it like this for a while? Thanks again, Lee KG5VU On Jun 17, 2015, at 1:02 PM, Don Wilhelm [hidden email]/user/SendEmail.jtp?type=nodenode=7604071i=0 wrote: Lee, Yes, I would change that capacitor - there is a chance that it will increase the output of the DDS and solve your power output problem. There is a difference in some KX1s due to care during construction, component tolerances, and a host of other factors. Make certain you counted the toroid turns correctly - a straight wire through the core is one turn, a full wrap around the core is 2 turns. Count the turns that go through the core center. If all else fails, you can install the KX1 power mod. If you have a good stock of 1/4 watt resistors you may not need to order the kit. Change R11 to 4.7 ohms and R30 to 33 ohms. If those steps do not solve the power output situation, send me an off-list email and we can make comparison measurements with my KX1. The KX1 audio is not 'earbusting', but is normally adequate. Yes, you may want to try headphones or earbuds with a higher SPL rating. The Quick Reference is the only place in the KX1 manual where SLO, SHI, and CAL are mentioned - I guess someone overlooked updating that portion of the manual since the VERY early days of the KX1. Look at the listing of menu items on page 65 and you will see DDS, BFO, and SIG to make those settings. This has been true since firmware rev 1.01. 1.02 is the latest version. 73, Don W3FPR On 6/17/2015 10:58 AM, KG5VU wrote: Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecrafthttps://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.qth.net_mailman_listinfo_elecraftd=AwMFaQc=8hUWFZcy2Z-Za5rBPlktOQr=sJF6P5kPtoOq-4ibyL6MxBDxCHbuqOBlbl_K1oh3QFQm=vLL9glvPEFUTQSqhVPEQ4JvH-_d_bCJGumtAFOEcNTks=C9WnM4h4dyT871Ms4SPXbPqcC_1pUD1OSK949HS-f54e= Help: http://mailman.qth.net/mmfaq.htmhttps://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.qth.net_mmfaq.htmd=AwMFaQc=8hUWFZcy2Z-Za5rBPlktOQr=sJF6P5kPtoOq-4ibyL6MxBDxCHbuqOBlbl_K1oh3QFQm=vLL9glvPEFUTQSqhVPEQ4JvH-_d_bCJGumtAFOEcNTks=uQjNRrbgkYAwcXN8h1z6wU7dEtlrjmz3ZW5Jbgkhd5Ae= Post: mailto:[hidden email]/user/SendEmail.jtp?type=nodenode=7604071i=1 This list hosted by: http://www.qsl.nethttps://urldefense.proofpoint.com/v2/url?u=http-3A__www.qsl.netd=AwMFaQc=8hUWFZcy2Z-Za5rBPlktOQr=sJF6P5kPtoOq-4ibyL6MxBDxCHbuqOBlbl_K1oh3QFQm=vLL9glvPEFUTQSqhVPEQ4JvH-_d_bCJGumtAFOEcNTks=6zYDMqK6pwoFgBt8VWqBiJCV3v7OLzYhXXVDTYE_HPke= Please help support this email list:
Re: [Elecraft] KX1 Power Output
I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Wouldn’t that mean you made two mistakes. Unless of course you had an extra 0.1 mF capacitor. But, if you have exactly the right amount of parts, which is the usual thing, then all misplaced part mistakes come in pairs. 73, phil, K7PEH On Jun 17, 2015, at 7:58 AM, KG5VU mlhoop...@comcast.net wrote: Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant? Thanks for any assistance you can provide. Lee KG5VU -- View this message in context: http://elecraft.365791.n2.nabble.com/KX1-Power-Output-tp7604063.html Sent from the Elecraft mailing list archive at Nabble.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 phys...@mac.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] KX1 Power Output
Phil, Fortunately, I had a spare .1 microfarad capacitor on hand. Not exactly the same size but very close. Thanks, Lee -- View this message in context: http://elecraft.365791.n2.nabble.com/KX1-Power-Output-tp7604063p7604065.html Sent from the Elecraft mailing list archive at Nabble.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] KX1 Power Output
Hi, I just finished building KX1 Serial Number 2879 which is the standard 20M/40M version. It's a great little rig but, I have a few issues, one major and two minor: A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with power supply at 13.8V. I tried to compress the winding on L2, as suggested, but this only degraded the output slightly (2.2W on 20M and 1.8W on 40M). Checked the components on the board against the schematic and everything checked out OK. Any ideas on what else I should try? Any idea what RF voltage levels I should see at each stage? (I have several decent oscilloscopes for testing if need be.) B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 40) but the audio level (particularly for weak signals) is pretty low unless I advance the AF Gain control to full clockwise. Is this normal? Do I just need to experiment with different sets of ear-buds? C) The firmware on my KX1 is version 1.02. The Menu on my unit is different than the Manual. It does not include SLO, SHI or CAL. Instead there are SIG, DDS and BFO. Are support documents for revised version available? For background, I had no difficulty during assembly. The KX1 passed all tests except the transmit power output. I did make one mistake during assembly however. I mistakenly inserted a .1 microfarad capacitor at C30 instead of a .01 microfarad capacitor. Since everything seemed to be working, so I have not corrected this issue. Think this could be significant? Thanks for any assistance you can provide. Lee KG5VU -- View this message in context: http://elecraft.365791.n2.nabble.com/KX1-Power-Output-tp7604063.html Sent from the Elecraft mailing list archive at Nabble.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] KX1 Power Output
Tom, Yes, your values look reasonable. The KX1 will always indicate that the voltage is about 0.4 volts lower than read at your supply. There is a series diode to prevent damage from reverse polarity, so the inside of the KX1 sees a voltage that is one diode drop less than your supply. 73, Don W3FPR On 1/30/2012 9:44 PM, Tom Crites wrote: I hope you can read this, but do the values look reasonable, for a KX1 with the output power mod. Peak to peak (Vpp) voltages and RMS (Vrms) were taken with a high end O'scope and used to compute the Power values (Ppp and Prms). Seems the KX1 read the supply voltage about 0.4 volts low. Thanks, Tom Crites, KC8SES __ 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
[Elecraft] KX1 Power Output
I hope you can read this, but do the values look reasonable, for a KX1 with the output power mod. Peak to peak (Vpp) voltages and RMS (Vrms) were taken with a high end O'scope and used to compute the Power values (Ppp and Prms). Seems the KX1 read the supply voltage about 0.4 volts low. Thanks, Tom Crites, KC8SES KX1 Power Output Supply Voltage 14.0 KX1 Dispaly Voltage 13.6 Freq (MHz) 3.675 7.100 10.100 14.025 Output Vpp 43.10 35.00 34.70 35.30 Output Vrms 15.08 12.28 12.13 12.38 ATU Displayed power 4.5 to 5.0 3.00 3.00 3.50 Ppp (watts) 4.53 2.99 2.93 3.04 Prms (watts)4.432.94 2.87 2.99 Supply Voltage 9.5 KX1 Dispaly Voltage 9.1 Freq (MHz)3.675 7.100 10.100 14.025 Output Vpp29.40 24.40 24.70 25.60 Output Vrms 10.14 8.43 8.528.94 ATU Displayed power 2.10 1.50 1.701.80 Ppp (watts) 2.11 1.45 1.491.60 Prms (watts)2.00 1.39 1.421.56 __ 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
Re: [Elecraft] KX1 Power Output
Panos, Great to hear you have the KX1 working. If you have the correct number of turns on T1 and the red winding is spread over most of the core, then T1 is OK - I did not see anything wrong with it when it was here. First try spreading/compressing the turns of L2 to see if the power output on 20 increases, then if you still do not have 3 watts on 20 meters with a 12 volt (or 13.8 volt) power supply, my recommendation is to change the resistors for a little more output. The power supply voltage does make a difference in the power output available from the KX1. 73, Don W3FPR Panos wrote: Hi all KX1 sn #01859 completed and everything (except some unexpected birdies inside the band) seems Ok (receiver is fantastic IMO). Power output on 7.100 Mhz is a hair less 3W and on 14.100 Mhz is 2.1-2.2 W According to your experience out there what is best? : a. Take out the T1 transformer and try to rewind and reinstall it? b. OR change the R11 and R30 to their PowerMod values? ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KX1 Power Output
Hi all KX1 sn #01859 completed and everything (except some unexpected birdies inside the band) seems Ok (receiver is fantastic IMO). Power output on 7.100 Mhz is a hair less 3W and on 14.100 Mhz is 2.1-2.2 W According to your experience out there what is best? : a. Take out the T1 transformer and try to rewind and reinstall it? b. OR change the R11 and R30 to their PowerMod values? Thanks in Advance 73, Panos, SV1COX No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.10/976 - Release Date: 27/8/2007 6:20 ii ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KX1 power output mod
Thanks to a fellow Elecrafter I now have the info on the KX1 power mod. 73, Joe W2KJ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KX1 power output increase -- free mod kit available
Some KX1s have slightly lower transmitter output than others. When using a 14V supply, the output may be as low as 2.5 to 3 watts across all bands instead of the expected 3 to 4 watts. When using the internal battery the output maybe as low as 0.75 to 1 watt instead of he expected 1 to 1.5 watts. Some builders have noticed this effect only after installing the KXB3080 option (30/80 meter module). The low-pass filter module supplied with the KXB3080 has slightly different characteristics from the original, which is necessary to obtain coverage of all four bands. If you think your KX1's output is on the low side, for whatever reason, you can order our model #KX1PWRMODKT at no charge. It's listed at the bottom of our Parts and Mod Kits page: http://www.elecraft.com/order_form_parts.htm The mod kit provides two resistors and instructions, and the change is easy to make. If you have your own stash of resistors, you can just download the application note at: http://www.elecraft.com/manual/ E740099%20KX1%20Application%20Note%20Rev%20A.pdf NOTE: We don't recommend making the change if your KX1 already puts out 4 watts or more on some bands. While it's generally safe to operate the KX1 at 5 watts, the design was optimized at the 4-watt level to provide plenty of safety margin in terms of RFI, current drain, and heat sinking via the top cover. 73, Wayne N6KR --- http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KX1 power output increase -- free mod kit available
Since someone already hollered privately and said, That URL doesn't work! Note that most people will have to splice it together again! The long URL gets broken in a lot of e-mail readers. An alternative TinyURL that will take you to the same Elecraft document to download/view the Application Note is: http://tinyurl.com/rzp42 Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KX1 power output increase -- free mod kit available
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I have not opened mine up yet, but in looking at this I found a typo in the App Note it says Locate resistor R30 on the bottom of the board between trimmer pot R30 should that be R4? Randy Rathbun NV0U [EMAIL PROTECTED] K2#1981, kx1 #1318, ARS #895, QRPARCI #10776, FP#1292, KCQRP #1 On Apr 5, 2006, at 6:07PM, wayne burdick wrote: Some KX1s have slightly lower transmitter output than others. When using a 14V supply, the output may be as low as 2.5 to 3 watts across all bands instead of the expected 3 to 4 watts. When using the internal battery the output maybe as low as 0.75 to 1 watt instead of he expected 1 to 1.5 watts. Some builders have noticed this effect only after installing the KXB3080 option (30/80 meter module). The low-pass filter module supplied with the KXB3080 has slightly different characteristics from the original, which is necessary to obtain coverage of all four bands. If you think your KX1's output is on the low side, for whatever reason, you can order our model #KX1PWRMODKT at no charge. It's listed at the bottom of our Parts and Mod Kits page: http://www.elecraft.com/order_form_parts.htm The mod kit provides two resistors and instructions, and the change is easy to make. If you have your own stash of resistors, you can just download the application note at: http://www.elecraft.com/manual/E740099%20KX1%20Application%20Note %20Rev%20A.pdf NOTE: We don't recommend making the change if your KX1 already puts out 4 watts or more on some bands. While it's generally safe to operate the KX1 at 5 watts, the design was optimized at the 4-watt level to provide plenty of safety margin in terms of RFI, current drain, and heat sinking via the top cover. 73, Wayne N6KR --- http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.1 (Darwin) iD8DBQFENF+t6zTmfegBFIERAoTPAJ9sVAzPivtXZvMEgRruiHSTBY0LfQCfTxxl hyJfTVd8WGOBpYS7nt9Iwgg= =HbQV -END PGP SIGNATURE- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KX1 power output increase -- free mod kit available
You are absolutely right. It is R4, not R30! Ron -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Randy Rathbun NV0U Sent: Wednesday, April 05, 2006 5:24 PM To: wayne burdick Cc: Elecraft Reflector Subject: Re: [Elecraft] KX1 power output increase -- free mod kit available -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I have not opened mine up yet, but in looking at this I found a typo in the App Note it says Locate resistor R30 on the bottom of the board between trimmer pot R30 should that be R4? Randy Rathbun NV0U [EMAIL PROTECTED] K2#1981, kx1 #1318, ARS #895, QRPARCI #10776, FP#1292, KCQRP #1 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KX1 power output
Oops, on my previous post regarding my KX1 power output, I fotgot to mention that I was running on a 13.8 volt power supply. Should I get more than 3.5 watts? Opinions on or off reflector OK. Thanks. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
