KPA1500 with P3 Transmit Monitor
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Looking at a draft of the KPA1500 amplifier, it appears
that the only place to install a TxMon or Wattmeter coupler is at the - output - of the built-in tuner. At that point, it will always show the SWR of the coax feedline, not the SWR that the amplifier "sees" as adjusted by the built-in tuner. Or, is there a coupler built-in inside the KPA1500 ? What am I missing? Jim - W4RKS ______________________________________________________________ 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: KPA1500 with P3 Transmit Monitor
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There is a coupler built into the amplifier. It's necessary to implement
ATU tuning. The SWR the PA sees is displayed on SWR LEDs on the front panel, on a couple of LCD "status" pages, and is available via the programming interface, where it can be observed on the KPA1500 Utility's "operate" page. 73 de Dick, K6KR -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of James Wilson Sent: Thursday, November 2, 2017 10:54 To: Elecraft <[hidden email]> Subject: [Elecraft] KPA1500 with P3 Transmit Monitor Looking at a draft of the KPA1500 amplifier, it appears that the only place to install a TxMon or Wattmeter coupler is at the - output - of the built-in tuner. At that point, it will always show the SWR of the coax feedline, not the SWR that the amplifier "sees" as adjusted by the built-in tuner. Or, is there a coupler built-in inside the KPA1500 ? What am I missing? Jim - W4RKS ______________________________________________________________ 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: KPA1500 with P3 Transmit Monitor
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In reply to this post by Jim Wilson
James,
Am not sure why you need a tuner between the radio and the amp in the first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I never have used the tuner in either when driving the amp? I assume the KPA9500 will have a 52 ohm input, and you would not need a tuner. Dick, K8ZTT From: James Wilson <[hidden email]> To: Elecraft <[hidden email]> Sent: Thursday, November 2, 2017 11:54 AM Subject: [Elecraft] KPA1500 with P3 Transmit Monitor Looking at a draft of the KPA1500 amplifier, it appears that the only place to install a TxMon or Wattmeter coupler is at the - output - of the built-in tuner. At that point, it will always show the SWR of the coax feedline, not the SWR that the amplifier "sees" as adjusted by the built-in tuner. Or, is there a coupler built-in inside the KPA1500 ? What am I missing? Jim - W4RKS ______________________________________________________________ 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: KPA1500 with P3 Transmit Monitor
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Most authorities I read and follow strongly suggest one NOT use a tuner
between the radio and the amp. This "old wives tail" goes back to the time many to most early tube type grounded grid amps did not have a tuned input. Seems that hams today choose to believe and practice old and outdated methodology {largely because someone said so} as opposed to learning and using current and correct methods. 73 Bob, K4TAX On 11/2/2017 1:14 PM, RIchard Williams via Elecraft wrote: > James, > Am not sure why you need a tuner between the radio and the amp in the first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I never have used the tuner in either when driving the amp? I assume the KPA9500 will have a 52 ohm input, and you would not need a tuner. > Dick, K8ZTT > > From: James Wilson <[hidden email]> > To: Elecraft <[hidden email]> > Sent: Thursday, November 2, 2017 11:54 AM > Subject: [Elecraft] KPA1500 with P3 Transmit Monitor > > Looking at a draft of the KPA1500 amplifier, it appears > that the only place to install a TxMon or Wattmeter coupler > is at the - output - of the built-in tuner. > > At that point, it will always show the SWR of the > coax feedline, not the SWR that the amplifier "sees" as > adjusted by the built-in tuner. > > Or, is there a coupler built-in inside the KPA1500 ? > > What am I missing? > > Jim - W4RKS > ______________________________________________________________ > 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] |
Re: KPA1500 with P3 Transmit Monitor
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I must be missing something here. I don't see where the original
poster had anything to do with a tuner between the K3 and the KPA1500. He wanted to hook his P3 TX monitor input to the output of the KPA1500 amp, before the amp tuner. Or maybe I misunderstood the original post. Gordon - N1MGO On 11/02/2017 02:20 PM, Bob McGraw K4TAX wrote: > Most authorities I read and follow strongly suggest one NOT use a > tuner between the radio and the amp. > > This "old wives tail" goes back to the time many to most early tube > type grounded grid amps did not have a tuned input. Seems that hams > today choose to believe and practice old and outdated methodology > {largely because someone said so} as opposed to learning and using > current and correct methods. > > 73 > > Bob, K4TAX > > > > On 11/2/2017 1:14 PM, RIchard Williams via Elecraft wrote: >> James, >> Am not sure why you need a tuner between the radio and the amp in the >> first place?? As of now, I have my K3S or K3 driving a Alpha 9500. >> I never have used the tuner in either when driving the amp? I assume >> the KPA9500 will have a 52 ohm input, and you would not need a tuner. >> Dick, K8ZTT >> >> From: James Wilson <[hidden email]> >> To: Elecraft <[hidden email]> >> Sent: Thursday, November 2, 2017 11:54 AM >> Subject: [Elecraft] KPA1500 with P3 Transmit Monitor >> Looking at a draft of the KPA1500 amplifier, it appears >> that the only place to install a TxMon or Wattmeter coupler >> is at the - output - of the built-in tuner. >> >> At that point, it will always show the SWR of the >> coax feedline, not the SWR that the amplifier "sees" as >> adjusted by the built-in tuner. >> >> Or, is there a coupler built-in inside the KPA1500 ? >> >> What am I missing? >> >> Jim - W4RKS >> ______________________________________________________________ >> 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] -- Gordon - N1MGO ______________________________________________________________ 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: KPA1500 with P3 Transmit Monitor
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Nah, I read it wrong.
Bob, K4TAX Sent from my iPhone > On Nov 2, 2017, at 1:25 PM, Gordon LaPoint <[hidden email]> wrote: > > I must be missing something here. I don't see where the original poster had anything to do with a tuner between the K3 and the KPA1500. He wanted to hook his P3 TX monitor input to the output of the KPA1500 amp, before the amp tuner. Or maybe I misunderstood the original post. > Gordon - N1MGO > >> On 11/02/2017 02:20 PM, Bob McGraw K4TAX wrote: >> Most authorities I read and follow strongly suggest one NOT use a tuner between the radio and the amp. >> >> This "old wives tail" goes back to the time many to most early tube type grounded grid amps did not have a tuned input. Seems that hams today choose to believe and practice old and outdated methodology {largely because someone said so} as opposed to learning and using current and correct methods. >> >> 73 >> >> Bob, K4TAX >> >> >> >>> On 11/2/2017 1:14 PM, RIchard Williams via Elecraft wrote: >>> James, >>> Am not sure why you need a tuner between the radio and the amp in the first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I never have used the tuner in either when driving the amp? I assume the KPA9500 will have a 52 ohm input, and you would not need a tuner. >>> Dick, K8ZTT >>> >>> From: James Wilson <[hidden email]> >>> To: Elecraft <[hidden email]> >>> Sent: Thursday, November 2, 2017 11:54 AM >>> Subject: [Elecraft] KPA1500 with P3 Transmit Monitor >>> Looking at a draft of the KPA1500 amplifier, it appears >>> that the only place to install a TxMon or Wattmeter coupler >>> is at the - output - of the built-in tuner. >>> >>> At that point, it will always show the SWR of the >>> coax feedline, not the SWR that the amplifier "sees" as >>> adjusted by the built-in tuner. >>> >>> Or, is there a coupler built-in inside the KPA1500 ? >>> >>> What am I missing? >>> >>> Jim - W4RKS >>> ______________________________________________________________ >>> 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] > > > -- > Gordon - N1MGO > > ______________________________________________________________ > 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 Elecraft mailing list
The ATU is built-in.
Sent from my iPhone ...nr4c. bill > On Nov 2, 2017, at 2:14 PM, RIchard Williams via Elecraft <[hidden email]> wrote: > > James, > Am not sure why you need a tuner between the radio and the amp in the first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I never have used the tuner in either when driving the amp? I assume the KPA9500 will have a 52 ohm input, and you would not need a tuner. > Dick, K8ZTT > > From: James Wilson <[hidden email]> > To: Elecraft <[hidden email]> > Sent: Thursday, November 2, 2017 11:54 AM > Subject: [Elecraft] KPA1500 with P3 Transmit Monitor > > Looking at a draft of the KPA1500 amplifier, it appears > that the only place to install a TxMon or Wattmeter coupler > is at the - output - of the built-in tuner. > > At that point, it will always show the SWR of the > coax feedline, not the SWR that the amplifier "sees" as > adjusted by the built-in tuner. > > Or, is there a coupler built-in inside the KPA1500 ? > > What am I missing? > > Jim - W4RKS > ______________________________________________________________ > 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] |
Re: KPA1500 with P3 Transmit Monitor
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I realize that, Bill but, Elecraft also makes a monitor accessory
for the P3. It should be useable with the KPA1500 but appears not to be the case. Jim - W4RKS -------------------------------------------------------- On Thu, Nov 2, 2017 at 5:54 PM, Nr4c <[hidden email]> wrote: > The ATU is built-in. > > Sent from my iPhone > ...nr4c. bill > > > > On Nov 2, 2017, at 2:14 PM, RIchard Williams via Elecraft < > [hidden email]> wrote: > > > > James, > > Am not sure why you need a tuner between the radio and the amp in the > first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I > never have used the tuner in either when driving the amp? I assume the > KPA9500 will have a 52 ohm input, and you would not need a tuner. > > Dick, K8ZTT > > 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: KPA1500 with P3 Transmit Monitor
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On the back of the amp there is a "TX SAMPLE" port to connect your P3.
Jim Rhodes K0XU On Nov 2, 2017 6:00 PM, "James Wilson" <[hidden email]> wrote: > I realize that, Bill but, Elecraft also makes a monitor accessory > for the P3. It should be useable with the KPA1500 but > appears not to be the case. > > Jim - W4RKS > > -------------------------------------------------------- > > On Thu, Nov 2, 2017 at 5:54 PM, Nr4c <[hidden email]> wrote: > > > The ATU is built-in. > > > > Sent from my iPhone > > ...nr4c. bill > > > > > > > On Nov 2, 2017, at 2:14 PM, RIchard Williams via Elecraft < > > [hidden email]> wrote: > > > > > > James, > > > Am not sure why you need a tuner between the radio and the amp in the > > first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I > > never have used the tuner in either when driving the amp? I assume the > > KPA9500 will have a 52 ohm input, and you would not need a tuner. > > > Dick, K8ZTT > > > > ______________________________________________________________ > 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: KPA1500 with P3 Transmit Monitor
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In reply to this post by Jim Wilson
Whether the TXMON add-on to the P3 "should be [useable] with the
KPA1500" is certainly an opinion you may choose to adopt. Whether Elecraft wants to implement your desire for lifetime forward compatibility of all existing products with all future products is a decision for the company, not us. Frankly, I think that would be financially unwise and a severe limitation on engineering and innovation. If YOU want to use your TXMON features on YOUR KPA1500, here is how you do it... Bypass the KPA1500's internal tuner. Add your OWN external tuner between the antenna and the KPA1500.... Insert your TXMON module between the tuner and the amp.... (or any other place you may care to insert it). This is the path I am choosing to take, as I will always have horizontal loop(s) that I want to use on multiple bands and frequently need better than a 3:1 tuner. When Wayne asked the pre-launch question, "What features...", I specifically asked for NO on-board tuner knowing I would never use it. I'd MUCH prefer an external KAT-1500 that can tune full power to 10:1.... cost be d$%^d. :) Alternatively, you could perhaps figure out where to tap the signal path and pull it external to put your module inline... or simply trust the numbers being computed by the device itself. Cleanest idea for no external tuner would be to add the SWR/power readings to Win4K3Suite... Just my 2/100ths of a US Dollar... 73, Clay Autery On 11/2/2017 5:59 PM, James Wilson wrote: > I realize that, Bill but, Elecraft also makes a monitor accessory > for the P3. It should be useable with the KPA1500 but > appears not to be the case. > > Jim - W4RKS > > -------------------------------------------------------- > > On Thu, Nov 2, 2017 at 5:54 PM, Nr4c <[hidden email]> wrote: > >> The ATU is built-in. >> >> Sent from my iPhone >> ...nr4c. bill >> >> >>> On Nov 2, 2017, at 2:14 PM, RIchard Williams via Elecraft < >> [hidden email]> wrote: >>> James, >>> Am not sure why you need a tuner between the radio and the amp in the >> first place?? As of now, I have my K3S or K3 driving a Alpha 9500. I >> never have used the tuner in either when driving the amp? I assume the >> KPA9500 will have a 52 ohm input, and you would not need a tuner. >>> Dick, K8ZTT >>> > ______________________________________________________________ > 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: KPA1500 with P3 Transmit Monitor
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In reply to this post by Jim Rhodes-2
Well.... there ya go!
Thank you Elecraft! Thank you Mr. Rhodes! <big grin> On 11/3/2017 6:45 AM, Jim Rhodes wrote: > On the back of the amp there is a "TX SAMPLE" port to connect your P3. > > Jim Rhodes > K0XU > > On Nov 2, 2017 6:00 PM, "James Wilson" <[hidden email]> wrote: > >> I realize that, Bill but, Elecraft also makes a monitor accessory >> for the P3. It should be useable with the KPA1500 but >> appears not to be the case. >> >> Jim - W4RKS ______________________________________________________________ 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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