Re: [Elecraft] KPA1500 Tx sample
Ah...so this means us Elecraft users are waiting on this feature to be implemented in the K4...got it, thanks! Tim On Sun, Feb 19, 2023, 3:56 AM David Decoons wrote: > The sample output on the amp is already enabled. You just need a radio > that supports adaptive predistortion. > > Dave wo2x > > Sent from my iPad > > > On Feb 19, 2023, at 1:19 AM, Tim Tucker wrote: > > > > Is there an ETA on when the TX Sample output on the KPA1500 will be > enabled > > for Pure Signal? > > > > Thx, > > AE6LX > > __ > > 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 rocke...@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] KPA1500 Tx sample
The sample output on the amp is already enabled. You just need a radio that supports adaptive predistortion. Dave wo2x Sent from my iPad > On Feb 19, 2023, at 1:19 AM, Tim Tucker wrote: > > Is there an ETA on when the TX Sample output on the KPA1500 will be enabled > for Pure Signal? > > Thx, > AE6LX > __ > 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 rocke...@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
[Elecraft] KPA1500 Tx sample
Is there an ETA on when the TX Sample output on the KPA1500 will be enabled for Pure Signal? Thx, AE6LX __ 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] KPA1500 TX Sample
I use these options and they are superb. 73, Bill K9YEQ -Original Message- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Eric Swartz - WA6HHQ, Elecraft Sent: Friday, March 23, 2018 2:12 PM To: Mel Farrer <farrerfo...@yahoo.com>; donw...@embarqmail.com; David Box <do...@suddenlink.net>; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 TX Sample The P3 TX monitor and SWR/Wattmeter option also does a great job at this. :-) 73, Eric /elecraft.com/ On 3/23/2018 11:55 AM, Mel Farrer via Elecraft wrote: > While all of the info is correct, I also like to mention that an inline > station monitor is also a great device. I use a old Kenwood SM-220 as a > permenant part of the station. That lets me see the RF amplitude and the > linearity of the signal. The trapozoid is used mostly to keep tabs on any > hint of distortion. Lots of info on its use. > Mel, K6KBE > > __ 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 k9...@live.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] KPA1500 TX Sample
On 3/23/2018 11:33 AM, Don Wilhelm wrote: I think there will be more information to come about its function. For the time being, it is safe to assume it is not a calibrated output, but simply a tap to observe the output waveform, rather than an amplitude measuring device. The most obvious use is as a sampling point to feed NR0V's excellent Pure Signal software. Warren received a Technical Excellence award for developing it. The software modifies the driving signal by "pre-distorting" it so that pre-distortion elements cancel distortion within the feedback loop. This is a fairly old technique -- it was, for example, implemented more than 50 years ago in a few professional and consumer power amplifiers, and also within "powered" loudspeakers (that is, those with built-in power amps) using motional feedback from the transducers. 73, Jim K9YC __ 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] KPA1500 TX Sample
The P3 TX monitor and SWR/Wattmeter option also does a great job at this. :-) 73, Eric /elecraft.com/ On 3/23/2018 11:55 AM, Mel Farrer via Elecraft wrote: While all of the info is correct, I also like to mention that an inline station monitor is also a great device. I use a old Kenwood SM-220 as a permenant part of the station. That lets me see the RF amplitude and the linearity of the signal. The trapozoid is used mostly to keep tabs on any hint of distortion. Lots of info on its use. Mel, K6KBE __ 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] KPA1500 TX Sample
While all of the info is correct, I also like to mention that an inline station monitor is also a great device. I use a old Kenwood SM-220 as a permenant part of the station. That lets me see the RF amplitude and the linearity of the signal. The trapozoid is used mostly to keep tabs on any hint of distortion. Lots of info on its use. Mel, K6KBE From: Don Wilhelm <donw...@embarqmail.com> To: David Box <do...@suddenlink.net>; Elecraft@mailman.qth.net Sent: Friday, March 23, 2018 11:37 AM Subject: Re: [Elecraft] KPA1500 TX Sample Dave, Since that "coupler" has only one output, it is not a full forward and reverse coupler, so it could be nothing more than a toroid output with the wire carrying the full output going through the center of the core - in other words, it can just be an "RF Sampler", and in that case it would not have to be placed in a place where the load is 50 ohms. I think there will be more information to come about its function. For the time being, it is safe to assume it is not a calibrated output, but simply a tap to observe the output waveform, rather than an amplitude measuring device. 73, Don W3FPR On 3/23/2018 2:14 PM, David Box wrote: > Don > > Was fairly certain that units were used incorrect but ya' never know > so appreciate confirmation. > > Wanting to get linearity test ready so now I know what is needed to > set up. I always want to monitor a new amp and the inclusion of this > output allows that. > > Now I do have one other "assumption" and that is the coupler is before > the internal ATU so it is always working with a 50 ohm load, hopefully > that is correct. > > 73 > > Dave K5MWR > > > On 3/23/2018 10:23 AM, Don Wilhelm wrote: >> David, >> >> It is just a coupler - nothing else makes sense for that use, so your >> -60dB assumption is correct. Yes, it is relative to the output, so >> dBm is not the proper designation. >> >> 73, >> Don W3FPR >> >> On 3/23/2018 10:09 AM, David Box wrote: >>> I am trying to get ready for delivery of the KPA1500 and have become >>> confused about the information available for the TX Sample port. >>> >>> The only information I can find states that this is a low-level >>> signal of -60dBm but dBm is a measure of absolute power which would >>> put this signal at 1 nanowatt. >>> >>> My first thought is that this is a typo and meant to show that the >>> signal level on the port is -60dB with respect to output but need >>> some verification. >> >> > > __ 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 farrerfo...@yahoo.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] KPA1500 TX Sample
Dave, Since that "coupler" has only one output, it is not a full forward and reverse coupler, so it could be nothing more than a toroid output with the wire carrying the full output going through the center of the core - in other words, it can just be an "RF Sampler", and in that case it would not have to be placed in a place where the load is 50 ohms. I think there will be more information to come about its function. For the time being, it is safe to assume it is not a calibrated output, but simply a tap to observe the output waveform, rather than an amplitude measuring device. 73, Don W3FPR On 3/23/2018 2:14 PM, David Box wrote: Don Was fairly certain that units were used incorrect but ya' never know so appreciate confirmation. Wanting to get linearity test ready so now I know what is needed to set up. I always want to monitor a new amp and the inclusion of this output allows that. Now I do have one other "assumption" and that is the coupler is before the internal ATU so it is always working with a 50 ohm load, hopefully that is correct. 73 Dave K5MWR On 3/23/2018 10:23 AM, Don Wilhelm wrote: David, It is just a coupler - nothing else makes sense for that use, so your -60dB assumption is correct. Yes, it is relative to the output, so dBm is not the proper designation. 73, Don W3FPR On 3/23/2018 10:09 AM, David Box wrote: I am trying to get ready for delivery of the KPA1500 and have become confused about the information available for the TX Sample port. The only information I can find states that this is a low-level signal of -60dBm but dBm is a measure of absolute power which would put this signal at 1 nanowatt. My first thought is that this is a typo and meant to show that the signal level on the port is -60dB with respect to output but need some verification. __ 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] KPA1500 TX Sample
Don Was fairly certain that units were used incorrect but ya' never know so appreciate confirmation. Wanting to get linearity test ready so now I know what is needed to set up. I always want to monitor a new amp and the inclusion of this output allows that. Now I do have one other "assumption" and that is the coupler is before the internal ATU so it is always working with a 50 ohm load, hopefully that is correct. 73 Dave K5MWR On 3/23/2018 10:23 AM, Don Wilhelm wrote: David, It is just a coupler - nothing else makes sense for that use, so your -60dB assumption is correct. Yes, it is relative to the output, so dBm is not the proper designation. 73, Don W3FPR On 3/23/2018 10:09 AM, David Box wrote: I am trying to get ready for delivery of the KPA1500 and have become confused about the information available for the TX Sample port. The only information I can find states that this is a low-level signal of -60dBm but dBm is a measure of absolute power which would put this signal at 1 nanowatt. My first thought is that this is a typo and meant to show that the signal level on the port is -60dB with respect to output but need some verification. __ 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] KPA1500 TX Sample
David, It is just a coupler - nothing else makes sense for that use, so your -60dB assumption is correct. Yes, it is relative to the output, so dBm is not the proper designation. 73, Don W3FPR On 3/23/2018 10:09 AM, David Box wrote: I am trying to get ready for delivery of the KPA1500 and have become confused about the information available for the TX Sample port. The only information I can find states that this is a low-level signal of -60dBm but dBm is a measure of absolute power which would put this signal at 1 nanowatt. My first thought is that this is a typo and meant to show that the signal level on the port is -60dB with respect to output but need some verification. __ 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] KPA1500 TX Sample
I am trying to get ready for delivery of the KPA1500 and have become confused about the information available for the TX Sample port. The only information I can find states that this is a low-level signal of -60dBm but dBm is a measure of absolute power which would put this signal at 1 nanowatt. My first thought is that this is a typo and meant to show that the signal level on the port is -60dB with respect to output but need some verification. Is there any information that shows actual transfer function between the output power and the TX sample port voltage into a 50 ohm load? Thanks Dave K5MWR __ 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
