KX3 IMD vs DC input, using built-in 2 TONE
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I am testing my KX3 / KXPA100 combo, looking at TX IMD and power output
depending on the DC power supply characteristics. I am experimenting with a N8XJK Boost Regulator (40A max) as well as an Astron linear supply adjusted down to low voltage, simulating a run-down battery. To judge IMD I use the built-in 2 TONE, mix down sampled output to audio, and feed into Spectrum Lab. When I look at the envelope, its smallest amplitude is about 1/3 of peak. This suggests that the 2 tones are not of equal amplitude. Has anyone else seen this? I downloaded the laterst firmware about a week ago. Thanks, Erik K7TV ______________________________________________________________ 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 Message delivered to [hidden email] |
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One more question:
Assuming that the 2 tones are about 2:3 in amplitude ratio, can anyone say how that would be expected to affect the 3rd order IMD figures? From: Erik Basilier [mailto:[hidden email]] Sent: Sunday, June 12, 2016 2:53 PM To: '[hidden email]' <[hidden email]> Subject: KX3 IMD vs DC input, using built-in 2 TONE I am testing my KX3 / KXPA100 combo, looking at TX IMD and power output depending on the DC power supply characteristics. I am experimenting with a N8XJK Boost Regulator (40A max) as well as an Astron linear supply adjusted down to low voltage, simulating a run-down battery. To judge IMD I use the built-in 2 TONE, mix down sampled output to audio, and feed into Spectrum Lab. When I look at the envelope, its smallest amplitude is about 1/3 of peak. This suggests that the 2 tones are not of equal amplitude. Has anyone else seen this? I downloaded the laterst firmware about a week ago. Thanks, Erik K7TV ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by K7TV
Of course, I don't mean that the nature of the 2 tones affect the IMD
characteristics of the hardware. Rather, what I meant was: "if one measures IMD with a standard 1:1 amplitude ratio, and then measures again with a non-standard 2:3 ratio, how much would the IMD suppression number change, and in what direction?" I imagine that the answer could be found either by using independently adjustable external audio tone generators, or with a math package. -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Erik Basilier Sent: Sunday, June 12, 2016 2:56 PM To: [hidden email] Subject: Re: [Elecraft] KX3 IMD vs DC input, using built-in 2 TONE One more question: Assuming that the 2 tones are about 2:3 in amplitude ratio, can anyone say how that would be expected to affect the 3rd order IMD figures? From: Erik Basilier [mailto:[hidden email]] Sent: Sunday, June 12, 2016 2:53 PM To: '[hidden email]' <[hidden email]> Subject: KX3 IMD vs DC input, using built-in 2 TONE I am testing my KX3 / KXPA100 combo, looking at TX IMD and power output depending on the DC power supply characteristics. I am experimenting with a N8XJK Boost Regulator (40A max) as well as an Astron linear supply adjusted down to low voltage, simulating a run-down battery. To judge IMD I use the built-in 2 TONE, mix down sampled output to audio, and feed into Spectrum Lab. When I look at the envelope, its smallest amplitude is about 1/3 of peak. This suggests that the 2 tones are not of equal amplitude. Has anyone else seen this? I downloaded the laterst firmware about a week ago. Thanks, Erik K7TV ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
Re: KX3 IMD vs DC input, using built-in 2 TONE
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In reply to this post by K7TV
Can't speak to the KX3, but for a K3(S) the mic gain equalizes the two tones.
On 6/12/2016 2:53 PM, Erik Basilier wrote: > I am testing my KX3 / KXPA100 combo, looking at TX IMD and power output > depending on the DC power supply characteristics. I am experimenting with a > N8XJK Boost Regulator (40A max) as well as an Astron linear supply adjusted > down to low voltage, simulating a run-down battery. > > > > To judge IMD I use the built-in 2 TONE, mix down sampled output to audio, > and feed into Spectrum Lab. > > > > When I look at the envelope, its smallest amplitude is about 1/3 of peak. > This suggests that the 2 tones are not of equal amplitude. Has anyone else > seen this? I downloaded the laterst firmware about a week ago. > > > > Thanks, > > Erik K7TV > ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by K7TV
>Wes Stewart wrote:
>Can't speak to the KX3, but for a K3(S) the mic gain equalizes the two tones. Thanks, Wes, that fixes it on the KX3 as well! -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Erik Basilier Sent: Sunday, June 12, 2016 3:11 PM To: [hidden email] Subject: Re: [Elecraft] KX3 IMD vs DC input, using built-in 2 TONE Of course, I don't mean that the nature of the 2 tones affect the IMD characteristics of the hardware. Rather, what I meant was: "if one measures IMD with a standard 1:1 amplitude ratio, and then measures again with a non-standard 2:3 ratio, how much would the IMD suppression number change, and in what direction?" I imagine that the answer could be found either by using independently adjustable external audio tone generators, or with a math package. -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Erik Basilier Sent: Sunday, June 12, 2016 2:56 PM To: [hidden email] Subject: Re: [Elecraft] KX3 IMD vs DC input, using built-in 2 TONE One more question: Assuming that the 2 tones are about 2:3 in amplitude ratio, can anyone say how that would be expected to affect the 3rd order IMD figures? From: Erik Basilier [mailto:[hidden email]] Sent: Sunday, June 12, 2016 2:53 PM To: '[hidden email]' <[hidden email]> Subject: KX3 IMD vs DC input, using built-in 2 TONE I am testing my KX3 / KXPA100 combo, looking at TX IMD and power output depending on the DC power supply characteristics. I am experimenting with a N8XJK Boost Regulator (40A max) as well as an Astron linear supply adjusted down to low voltage, simulating a run-down battery. To judge IMD I use the built-in 2 TONE, mix down sampled output to audio, and feed into Spectrum Lab. When I look at the envelope, its smallest amplitude is about 1/3 of peak. This suggests that the 2 tones are not of equal amplitude. Has anyone else seen this? I downloaded the laterst firmware about a week ago. Thanks, Erik K7TV ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by K7TV
You do realize you can adjust the level one of the tones with the mic gain control, don’t you?
..bc nr4c > On Jun 12, 2016, at 6:11 PM, Erik Basilier <[hidden email]> wrote: > > Of course, I don't mean that the nature of the 2 tones affect the IMD > characteristics of the hardware. Rather, what I meant was: "if one measures > IMD with a standard 1:1 amplitude ratio, and then measures again with a > non-standard 2:3 ratio, how much would the IMD suppression number change, > and in what direction?" I imagine that the answer could be found either by > using independently adjustable external audio tone generators, or with a > math package. > > -----Original Message----- > From: Elecraft [mailto:[hidden email]] On Behalf Of Erik > Basilier > Sent: Sunday, June 12, 2016 2:56 PM > To: [hidden email] > Subject: Re: [Elecraft] KX3 IMD vs DC input, using built-in 2 TONE > > One more question: > > Assuming that the 2 tones are about 2:3 in amplitude ratio, can anyone say > how that would be expected to affect the 3rd order IMD figures? > > > > From: Erik Basilier [mailto:[hidden email]] > Sent: Sunday, June 12, 2016 2:53 PM > To: '[hidden email]' <[hidden email]> > Subject: KX3 IMD vs DC input, using built-in 2 TONE > > > > I am testing my KX3 / KXPA100 combo, looking at TX IMD and power output > depending on the DC power supply characteristics. I am experimenting with a > N8XJK Boost Regulator (40A max) as well as an Astron linear supply adjusted > down to low voltage, simulating a run-down battery. > > > > To judge IMD I use the built-in 2 TONE, mix down sampled output to audio, > and feed into Spectrum Lab. > > > > When I look at the envelope, its smallest amplitude is about 1/3 of peak. > This suggests that the 2 tones are not of equal amplitude. Has anyone else > seen this? I downloaded the laterst firmware about a week ago. > > > > Thanks, > > Erik K7TV > > ______________________________________________________________ > 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 Message > delivered to [hidden email] > > ______________________________________________________________ > 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 > Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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