KPA500/K3 AUX bus specification
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Can someone please point me to a definition or specification for the KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this appears to only cover the KPA500 - PC interface.
Thanks and 73, Andy k3wyc ______________________________________________________________ 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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Page 25 of the KPA500 manual.
http://www.elecraft.com/manual/E740150%20KPA500%20Owner's%20man%20%20Rev%20D4.pdf Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of ANDY DURBIN [[hidden email]] Sent: Sunday, April 29, 2018 3:59 PM To: [hidden email] Subject: [Elecraft] KPA500/K3 AUX bus specification Can someone please point me to a definition or specification for the KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this appears to only cover the KPA500 - PC interface. Thanks and 73, Andy k3wyc ______________________________________________________________ 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]
Chuck, KE9UW
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Re: KPA500/K3 AUX bus specification
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The AUXBUS protocol is Elecraft proprietary and is not published.
It is the single wire communications between the K3 and its options, both internal and external. The K3 Programmers Reference and KPA500 Programmers Reference gives you commands that can be issued from a PC or other connected computer - those commands are quite extensive and can give you complete control from a PC. 73, Don W3FPR > From: [hidden email] [[hidden email]] on behalf of ANDY DURBIN [[hidden email]] > Sent: Sunday, April 29, 2018 3:59 PM > To: [hidden email] > Subject: [Elecraft] KPA500/K3 AUX bus specification > > Can someone please point me to a definition or specification for the KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this appears to only cover the KPA500 - PC interface. ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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In reply to this post by ANDY DURBIN
Proprietary. I’ve decoded a couple of messages, but AFAIK there is no publication.
Ken K6MR ________________________________ From: [hidden email] <[hidden email]> on behalf of ANDY DURBIN <[hidden email]> Sent: Sunday, April 29, 2018 1:59:47 PM To: [hidden email] Subject: [Elecraft] KPA500/K3 AUX bus specification Can someone please point me to a definition or specification for the KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this appears to only cover the KPA500 - PC interface. Thanks and 73, Andy k3wyc ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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In reply to this post by Don Wilhelm
Don,
Thanks for the reply. I'm familiar with the PC interface and have, in the hope of tracking down a problem, built a logger that uses that bus to interrogate the KPA500 at 10 Hz. I was hoping the AUX bus would give a faster detection of a spurious band change than my 10 Hz interrogation ^bn;. I'll look at the bus with my DSO but I have already been given information than suggests its data rate will be too low to be useful. I may have to resort to instrumenting the shift register signals from the front panel to the LPF but I was hoping to avoid that. 73, Andy ________________________________ From: Don Wilhelm <[hidden email]> Sent: Sunday, April 29, 2018 2:45 PM To: ANDY DURBIN; [hidden email] Subject: Re: [Elecraft] KPA500/K3 AUX bus specification The AUXBUS protocol is Elecraft proprietary and is not published. It is the single wire communications between the K3 and its options, both internal and external. The K3 Programmers Reference and KPA500 Programmers Reference gives you commands that can be issued from a PC or other connected computer - those commands are quite extensive and can give you complete control from a PC. 73, Don W3FPR > From: [hidden email] [[hidden email]] on behalf of ANDY DURBIN [[hidden email]] > Sent: Sunday, April 29, 2018 3:59 PM > To: [hidden email] > Subject: [Elecraft] KPA500/K3 AUX bus specification > > Can someone please point me to a definition or specification for the KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this appears to only cover the KPA500 - PC interface. ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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Andy,
While you seem capable of reverse engineering the AUXBUS, it is fraught with danger if you get it wrong. You are "own your own" in this matter. 73, Don W3FPR On 4/29/2018 7:37 PM, ANDY DURBIN wrote: > > Don, > > > Thanks for the reply. > > > I'm familiar with the PC interface and have, in the hope of tracking > down a problem, built a logger that uses that bus to interrogate the > KPA500 at 10 Hz. I was hoping the AUX bus would give a faster > detection of a spurious band change than my 10 Hz interrogation ^bn;. > I'll look at the bus with my DSO but I have already been given > information than suggests its data rate will be too low to be useful. > > > I may have to resort to instrumenting the shift register signals from > the front panel to the LPF but I was hoping to avoid that. > > > 73, > > Andy > > > > > > ------------------------------------------------------------------------ > *From:* Don Wilhelm <[hidden email]> > *Sent:* Sunday, April 29, 2018 2:45 PM > *To:* ANDY DURBIN; [hidden email] > *Subject:* Re: [Elecraft] KPA500/K3 AUX bus specification > The AUXBUS protocol is Elecraft proprietary and is not published. > It is the single wire communications between the K3 and its options, > both internal and external. > > The K3 Programmers Reference and KPA500 Programmers Reference gives you > commands that can be issued from a PC or other connected computer - > those commands are quite extensive and can give you complete control > from a PC. > > 73, > Don W3FPR > > > > From: [hidden email] > [[hidden email]] on behalf of ANDY DURBIN > [[hidden email]] > > Sent: Sunday, April 29, 2018 3:59 PM > > To: [hidden email] > > Subject: [Elecraft] KPA500/K3 AUX bus specification > > > > Can someone please point me to a definition or specification for the > KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but > this appears to only cover the KPA500 - PC interface. ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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"fraught with danger"?
It's hard for me to imagine how monitoring an "output only" bus with a DSO could be "fraught with danger". There would be nothing connected to the AUX bus except the DSO and a pull up resistor. About the only way I can see to cause any damage is to exceed Io max of the 2N7002K. What risks have I overlooked? I don't want to void the warranty while there are still unresolved issues with my KPA500. 73, Andy k3wyc ________________________________ From: Don Wilhelm <[hidden email]> Sent: Sunday, April 29, 2018 5:42 PM To: ANDY DURBIN; [hidden email] Subject: Re: [Elecraft] KPA500/K3 AUX bus specification Andy, While you seem capable of reverse engineering the AUXBUS, it is fraught with danger if you get it wrong. You are "own your own" in this matter. 73, Don W3FPR On 4/29/2018 7:37 PM, ANDY DURBIN wrote: > > Don, > > > Thanks for the reply. > > > I'm familiar with the PC interface and have, in the hope of tracking > down a problem, built a logger that uses that bus to interrogate the > KPA500 at 10 Hz. I was hoping the AUX bus would give a faster > detection of a spurious band change than my 10 Hz interrogation ^bn;. > I'll look at the bus with my DSO but I have already been given > information than suggests its data rate will be too low to be useful. > > > I may have to resort to instrumenting the shift register signals from > the front panel to the LPF but I was hoping to avoid that. > > > 73, > > Andy > > > > > > ------------------------------------------------------------------------ > *From:* Don Wilhelm <[hidden email]> > *Sent:* Sunday, April 29, 2018 2:45 PM > *To:* ANDY DURBIN; [hidden email] > *Subject:* Re: [Elecraft] KPA500/K3 AUX bus specification > The AUXBUS protocol is Elecraft proprietary and is not published. > It is the single wire communications between the K3 and its options, > both internal and external. > > The K3 Programmers Reference and KPA500 Programmers Reference gives you > commands that can be issued from a PC or other connected computer - > those commands are quite extensive and can give you complete control > from a PC. > > 73, > Don W3FPR > > > > From: [hidden email] > [[hidden email]] on behalf of ANDY DURBIN > [[hidden email]] > > Sent: Sunday, April 29, 2018 3:59 PM > > To: [hidden email] > > Subject: [Elecraft] KPA500/K3 AUX bus specification > > > > Can someone please point me to a definition or specification for the > KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but > this appears to only cover the KPA500 - PC interface. ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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Administrator
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I designed the auxBus hardware interface and protocol. I’d be happy to answer any historical, philosophical, or metaphysical questions about it off-list.
73, Wayne N6KR --- http://www.elecraft.com > On Apr 29, 2018, at 6:47 PM, ANDY DURBIN <[hidden email]> wrote: > > "fraught with danger"? > > > It's hard for me to imagine how monitoring an "output only" bus with a DSO could be "fraught with danger". There would be nothing connected to the AUX bus except the DSO and a pull up resistor. About the only way I can see to cause any damage is to exceed Io max of the 2N7002K. > > > What risks have I overlooked? I don't want to void the warranty while there are still unresolved issues with my KPA500. > > > 73, > > Andy k3wyc > > > ________________________________ > From: Don Wilhelm <[hidden email]> > Sent: Sunday, April 29, 2018 5:42 PM > To: ANDY DURBIN; [hidden email] > Subject: Re: [Elecraft] KPA500/K3 AUX bus specification > > Andy, > > While you seem capable of reverse engineering the AUXBUS, it is fraught > with danger if you get it wrong. > You are "own your own" in this matter. > > 73, > Don W3FPR > >> On 4/29/2018 7:37 PM, ANDY DURBIN wrote: >> >> Don, >> >> >> Thanks for the reply. >> >> >> I'm familiar with the PC interface and have, in the hope of tracking >> down a problem, built a logger that uses that bus to interrogate the >> KPA500 at 10 Hz. I was hoping the AUX bus would give a faster >> detection of a spurious band change than my 10 Hz interrogation ^bn;. >> I'll look at the bus with my DSO but I have already been given >> information than suggests its data rate will be too low to be useful. >> >> >> I may have to resort to instrumenting the shift register signals from >> the front panel to the LPF but I was hoping to avoid that. >> >> >> 73, >> >> Andy >> >> >> >> >> >> ------------------------------------------------------------------------ >> *From:* Don Wilhelm <[hidden email]> >> *Sent:* Sunday, April 29, 2018 2:45 PM >> *To:* ANDY DURBIN; [hidden email] >> *Subject:* Re: [Elecraft] KPA500/K3 AUX bus specification >> The AUXBUS protocol is Elecraft proprietary and is not published. >> It is the single wire communications between the K3 and its options, >> both internal and external. >> >> The K3 Programmers Reference and KPA500 Programmers Reference gives you >> commands that can be issued from a PC or other connected computer - >> those commands are quite extensive and can give you complete control >> from a PC. >> >> 73, >> Don W3FPR >> >> >>> From: [hidden email] >> [[hidden email]] on behalf of ANDY DURBIN >> [[hidden email]] >>> Sent: Sunday, April 29, 2018 3:59 PM >>> To: [hidden email] >>> Subject: [Elecraft] KPA500/K3 AUX bus specification >>> >>> Can someone please point me to a definition or specification for the >> KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but >> this appears to only cover the KPA500 - PC interface. > > ______________________________________________________________ > 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: KPA500/K3 AUX bus specification
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In reply to this post by ANDY DURBIN
Andy;
You are using the KPA500 with a non-Elecraft radio. The Auxbus has no traffic - it is _only_ used to communicate to the K3, and is only used when the K3 is set in the KPA500 preferences. I will communicate further with you shortly with more information to help clear some of your misunderstanding of the KPA500. 73, Jack, W6FB > On Apr 29, 2018, at 6:47 PM, ANDY DURBIN <[hidden email]> wrote: > > "fraught with danger"? > > > It's hard for me to imagine how monitoring an "output only" bus with a DSO could be "fraught with danger". There would be nothing connected to the AUX bus except the DSO and a pull up resistor. About the only way I can see to cause any damage is to exceed Io max of the 2N7002K. > > > What risks have I overlooked? I don't want to void the warranty while there are still unresolved issues with my KPA500. > > > 73, > > Andy k3wyc > > > ________________________________ > From: Don Wilhelm <[hidden email]> > Sent: Sunday, April 29, 2018 5:42 PM > To: ANDY DURBIN; [hidden email] > Subject: Re: [Elecraft] KPA500/K3 AUX bus specification > > Andy, > > While you seem capable of reverse engineering the AUXBUS, it is fraught > with danger if you get it wrong. > You are "own your own" in this matter. > > 73, > Don W3FPR > > On 4/29/2018 7:37 PM, ANDY DURBIN wrote: >> >> Don, >> >> >> Thanks for the reply. >> >> >> I'm familiar with the PC interface and have, in the hope of tracking >> down a problem, built a logger that uses that bus to interrogate the >> KPA500 at 10 Hz. I was hoping the AUX bus would give a faster >> detection of a spurious band change than my 10 Hz interrogation ^bn;. >> I'll look at the bus with my DSO but I have already been given >> information than suggests its data rate will be too low to be useful. >> >> >> I may have to resort to instrumenting the shift register signals from >> the front panel to the LPF but I was hoping to avoid that. >> >> >> 73, >> >> Andy >> >> >> >> >> >> ------------------------------------------------------------------------ >> *From:* Don Wilhelm <[hidden email]> >> *Sent:* Sunday, April 29, 2018 2:45 PM >> *To:* ANDY DURBIN; [hidden email] >> *Subject:* Re: [Elecraft] KPA500/K3 AUX bus specification >> The AUXBUS protocol is Elecraft proprietary and is not published. >> It is the single wire communications between the K3 and its options, >> both internal and external. >> >> The K3 Programmers Reference and KPA500 Programmers Reference gives you >> commands that can be issued from a PC or other connected computer - >> those commands are quite extensive and can give you complete control >> from a PC. >> >> 73, >> Don W3FPR >> >> >>> From: [hidden email] >> [[hidden email]] on behalf of ANDY DURBIN >> [[hidden email]] >>> Sent: Sunday, April 29, 2018 3:59 PM >>> To: [hidden email] >>> Subject: [Elecraft] KPA500/K3 AUX bus specification >>> >>> Can someone please point me to a definition or specification for the >> KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but >> this appears to only cover the KPA500 - PC interface. > > ______________________________________________________________ > 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: KPA500/K3 AUX bus specification
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In reply to this post by ANDY DURBIN
Andy,
You'll find the band outputs on the KPA500 aux connector (BAND0-3) are quite reliable and fast when it comes to detecting band change outputs. They appear to be flipped/set quite early in the band change sequence/exchange between the K3 and amp, certainly before RF is applied (yay !). At least I've not caught my K3/KPA500(s) doing anything silly in this regard yet. My only gripe with the BAND outputs is that 60m was encoded as 0000 and not 1111 on this 4-bit interface, which means telling the difference between the amp being physically OFF and/or on 60m requires a separate monitoring circuit... >:| 73 Matthew VK5ZM On 30 April 2018 at 09:07, ANDY DURBIN <[hidden email]> wrote: > Don, > > > Thanks for the reply. > > > I'm familiar with the PC interface and have, in the hope of tracking down > a problem, built a logger that uses that bus to interrogate the KPA500 at > 10 Hz. I was hoping the AUX bus would give a faster detection of a > spurious band change than my 10 Hz interrogation ^bn;. I'll look at the > bus with my DSO but I have already been given information than suggests its > data rate will be too low to be useful. > > > I may have to resort to instrumenting the shift register signals from the > front panel to the LPF but I was hoping to avoid that. > > > 73, > > Andy > > > > > ________________________________ > From: Don Wilhelm <[hidden email]> > Sent: Sunday, April 29, 2018 2:45 PM > To: ANDY DURBIN; [hidden email] > Subject: Re: [Elecraft] KPA500/K3 AUX bus specification > > The AUXBUS protocol is Elecraft proprietary and is not published. > It is the single wire communications between the K3 and its options, > both internal and external. > > The K3 Programmers Reference and KPA500 Programmers Reference gives you > commands that can be issued from a PC or other connected computer - > those commands are quite extensive and can give you complete control > from a PC. > > 73, > Don W3FPR > > > > From: [hidden email] [[hidden email]] > on behalf of ANDY DURBIN [[hidden email]] > > Sent: Sunday, April 29, 2018 3:59 PM > > To: [hidden email] > > Subject: [Elecraft] KPA500/K3 AUX bus specification > > > > Can someone please point me to a definition or specification for the > KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this > appears to only cover the KPA500 - PC interface. > ______________________________________________________________ > 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: KPA500/K3 AUX bus specification
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In reply to this post by Don Wilhelm
On 4/29/2018 2:45 PM, Don Wilhelm wrote:
> The AUXBUS protocol is Elecraft proprietary and is not published. > It is the single wire communications between the K3 and its options, > both internal and external. It DOES seem reasonable to publish at least an electrical transmission spec for it -- i.e., voltages, source and load impedances, whether it is intended to be terminated (impedance matched) or un-terminated, distance limits for various cable parameters. In fact, it seems unreasonable to NOT put it in the manual RS232, for example, is runs UN-terminated, and the limit on distance is the capacitance of the cable, not it's physical length. Many years ago, the RS232 spec was note that capacitance was the limitation. The way to think about this is that UN-terminated circuits are analyzed as "lumped parameter" systems, where bandwidth limits boil down to degradation of rise time by RC time constants. The source Z is low, the receiving Z is high. TERMINATED systems function as transmission lines, and everything we know about traansmission lines applies. I'm using only the AUX Bus for communication between K3 and KRC2, using a short length of mini Belden 75 ohm coax. If I were, for example, remoting a KPA500 or KPA1500, it would be nice to run only coax (or a single pair out of CAT5) for that bus, which requires that you know the electrical limits of the circuit. 73, Jim K9YC ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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In reply to this post by wayne burdick
On 4/29/2018 8:27 PM, Wayne Burdick wrote:
> philosophical, or metaphysical questions How appropriate on a Sunday night! 73, Jim ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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In reply to this post by ANDY DURBIN
You would need to sign a non-disclosure agreement for anything beyond
the logic level (TTL) and pinout information. I've never heard of one being given out for this purpose. -- David Woolley Owner K2 06123 On 29/04/18 21:59, ANDY DURBIN wrote: > Can someone please point me to a definition or specification for the KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this appears to only cover the KPA500 - PC interface. > ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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In reply to this post by Jim Brown-10
I agree with Jim here. I am thinking of getting a KPA1500 to
replace my Expert 1.3K. (I got the 1.3K after my wife won a $1000 off prize at the Top Band Dinner. I thought the 1.3K would have good resale value given its use on DXpeditions.) The logical place for the amp is in my garage, near the antennas feed points and near an electrical subpanel with 60A 240V service. Installing the 240 outlet in the garage is probably a DIY project. I do want the tight integration of the amp with the K3, so an AUX bus connection is required. 73 Bill AE6JV On 4/30/18 at 12:22 AM, [hidden email] (Jim Brown) wrote: >It DOES seem reasonable to publish at least an electrical >transmission spec for it -- i.e., voltages, source and load >impedances, whether it is intended to be terminated (impedance >matched) or un-terminated, distance limits for various cable >parameters. In fact, it seems unreasonable to NOT put it in the >manual ... ----------------------------------------------------------------------- Bill Frantz | Since the IBM Selectric, keyboards have gotten 408-356-8506 | steadily worse. Now we have touchscreen keyboards. www.pwpconsult.com | Can we make something even worse? ______________________________________________________________ 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: KPA500/K3 AUX bus specification
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Bill,
The Y-BOX v2.1 and single $20 25ft M/F "HD15" cable could let you remote the KPA1500 or KPA500 to the garage quite nicely, including remote power power on/off via a K3 macro. I haven't tested a cable that long, but know of no reason that it won't work as long as the voltage drop isn't significant. Maybe a pair of these high quality cables in series would work too (50 ft)? See: http://www.kkn.net/~n6tv/Y-BOX/Features.html#Remote and http://www.cablesondemand.com/category/HD15/product/CS-DSDHD15MF0/URvars/Items/Library/InfoManage/CS-DSDHD15MF0.htm 73, Bob, N6TV https://bit.ly/Y-BOX On Mon, Apr 30, 2018, 6:29 AM Bill Frantz <[hidden email]> wrote: > I agree with Jim here. I am thinking of getting a KPA1500 to > replace my Expert 1.3K. (I got the 1.3K after my wife won a > $1000 off prize at the Top Band Dinner. I thought the 1.3K would > have good resale value given its use on DXpeditions.) > > The logical place for the amp is in my garage, near the antennas > feed points and near an electrical subpanel with 60A 240V > service. Installing the 240 outlet in the garage is probably a > DIY project. > > I do want the tight integration of the amp with the K3, so an > AUX bus connection is required. > > 73 Bill AE6JV > 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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