Re: [Elecraft] KPA500/K3 AUX bus specification

[Jack Brindle]

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  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 
> Sent: Sunday, April 29, 2018 5:42 PM
> To: ANDY DURBIN; elecraft@mailman.qth.net
> 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 
>> *Sent:* Sunday, April 29, 2018 2:45 PM
>> *To:* ANDY DURBIN; elecraft@mailman.qth.net
>> *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: elecraft-boun...@mailman.qth.net
>> [elecraft-boun...@mailman.qth.net] on behalf of ANDY DURBIN
>> [a.dur...@msn.com]
>>> Sent: Sunday, April 29, 2018 3:59 PM
>>> To: elecraft@mailman.qth.net
>>> 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.
> 
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Re: [Elecraft] KPA500/K3 AUX bus specification

[Wayne Burdick]

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  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 
> Sent: Sunday, April 29, 2018 5:42 PM
> To: ANDY DURBIN; elecraft@mailman.qth.net
> 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 
>> *Sent:* Sunday, April 29, 2018 2:45 PM
>> *To:* ANDY DURBIN; elecraft@mailman.qth.net
>> *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: elecraft-boun...@mailman.qth.net
>> [elecraft-boun...@mailman.qth.net] on behalf of ANDY DURBIN
>> [a.dur...@msn.com]
>>> Sent: Sunday, April 29, 2018 3:59 PM
>>> To: elecraft@mailman.qth.net
>>> 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.
> 
> __
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Re: [Elecraft] KPA500/K3 AUX bus specification

[ANDY DURBIN]

"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 
Sent: Sunday, April 29, 2018 5:42 PM
To: ANDY DURBIN; elecraft@mailman.qth.net
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 
> *Sent:* Sunday, April 29, 2018 2:45 PM
> *To:* ANDY DURBIN; elecraft@mailman.qth.net
> *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: elecraft-boun...@mailman.qth.net
> [elecraft-boun...@mailman.qth.net] on behalf of ANDY DURBIN
> [a.dur...@msn.com]
> > Sent: Sunday, April 29, 2018 3:59 PM
> > To: elecraft@mailman.qth.net
> > 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.

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Re: [Elecraft] KPA500/K3 AUX bus specification

[Don Wilhelm]

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 
*Sent:* Sunday, April 29, 2018 2:45 PM
*To:* ANDY DURBIN; elecraft@mailman.qth.net
*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: elecraft-boun...@mailman.qth.net 
[elecraft-boun...@mailman.qth.net] on behalf of ANDY DURBIN 
[a.dur...@msn.com]

> Sent: Sunday, April 29, 2018 3:59 PM
> To: elecraft@mailman.qth.net
> 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.


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[Elecraft] Elecraft CW Net Report

[kevinr]

Good Evening,

    QSB was deep today.  I was giving reports of S1 to S7. Luckily the 
noise level was not too high on my end.  Some parts of the US are 
actually warm and sunny while others have yet to see spring.  Hopefully 
May will end our wait for warm weather and gardening.  I have to use a 
greenhouse because living on a mountain means my season is that much 
shorter than those folks in the valleys.  Probably six weeks or more 
less of warm soil.  But I adapt.


  On 14050 kHz at 2200z:

NO8V - John - MI

W0CZ - Ken - ND

AB9V - Mike - IN

K6XK - Roy - IA

K1AY - Chris - Fl


  On 7045.5 kHz at z:

K6PJV - Dale - CA

WM5F - Dwight - ID


   The weatherman says warmer by the end of the week.  Until then I'll 
do my birding sitting at this desk with Roger Tory Peterson's guide and 
a corner window seat.  The migration brings a lot of variety this time 
of year.  Maybe I'll get lucky and see another Western Tanager this week.


    Until Sunday,

   Kevin.  KD5ONS


-

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Re: [Elecraft] FW: How far can the KPA1500 amp be from the PS?

[kstover]

Who said move the amp outside?
I said move the power run outside from the room where the panel is to the
room that needs it.

R. Kevin StoverAC0H

ARRL, FISTS, SKCC, NAQCC.
One of the guys that made sneakernet irrelevant, in my little corner of the
world.
"If it doesn't work the first time you push the button it won't work the
20th.Just stop."

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Edward R Cole
Sent: Sunday, April 29, 2018 5:57 PM
To: Elecraft Reflector 
Subject: Re: [Elecraft] FW: How far can the KPA1500 amp be from the PS?

I would agree.  If I invested >$5K in a shiny new piece of ham gear I would
not risk it to damage from moisture.  Besides, I would want to admire it
every time I sat down in the shack.

With that being said, I have a lot of equipment remotely located at tower
top or bottom.  Most of my operating is VHF/UHF/mw where RF cable losses can
be astronomical.  Everything at 900-MHz and up is remote in outside
enclosures (usually fiberglass).  NONE are air-tight and are open on bottom
for free air exchange.  I live in a coastal, sub-arctic climate which
guarantee's moist air.  Temperature changes will pull outside air into
sealed compartments which have no path to exhaust back outside.  Even if you
live in the desert, temperature pumping exists (less extremely a air is
drier).

I am currently in process of installing a 1000w 6m,1200w 2m, and 600w
1296 amplifiers at base of their respective antennas (towers).  All will
have cooling fans with exterior air exchange (typically drawing air thru
openings in bottom of enclosure and exhausted by fans thru separate vents
(shielded from water entry).

For HF, cable loss is insignificant if they are rated for QRO; keep it
inside, warm/cool and dry.

73, Ed

Rick N6XI, writes (edited):

I would advise against putting the amp
outdoors. Even if the housing is 100% water tight forever, Murphy almost
guarantees that the first failure that causes you to want to access the
amplifier will occur during a downpour or snow storm.


73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubus...@gmail.com 

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Re: [Elecraft] KPA500/K3 AUX bus specification

[ANDY DURBIN]

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 
Sent: Sunday, April 29, 2018 2:45 PM
To: ANDY DURBIN; elecraft@mailman.qth.net
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: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on 
> behalf of ANDY DURBIN [a.dur...@msn.com]
> Sent: Sunday, April 29, 2018 3:59 PM
> To: elecraft@mailman.qth.net
> 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.
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Re: [Elecraft] FW: How far can the KPA1500 amp be from the PS?

[Edward R Cole]

I would agree.  If I invested >$5K in a shiny new piece of ham gear I 
would not risk it to damage from moisture.  Besides, I would want to 
admire it every time I sat down in the shack.


With that being said, I have a lot of equipment remotely located at 
tower top or bottom.  Most of my operating is VHF/UHF/mw where RF 
cable losses can be astronomical.  Everything at 900-MHz and up is 
remote in outside enclosures (usually fiberglass).  NONE are 
air-tight and are open on bottom for free air exchange.  I live in a 
coastal, sub-arctic climate which guarantee's moist air.  Temperature 
changes will pull outside air into sealed compartments which have no 
path to exhaust back outside.  Even if you live in the desert, 
temperature pumping exists (less extremely a air is drier).


I am currently in process of installing a 1000w 6m,1200w 2m, and 600w 
1296 amplifiers at base of their respective antennas (towers).  All 
will have cooling fans with exterior air exchange (typically drawing 
air thru openings in bottom of enclosure and exhausted by fans thru 
separate vents (shielded from water entry).


For HF, cable loss is insignificant if they are rated for QRO; keep 
it inside, warm/cool and dry.


73, Ed

Rick N6XI, writes (edited):

I would advise against putting the amp
outdoors. Even if the housing is 100% water tight forever, Murphy almost
guarantees that the first failure that causes you to want to access the
amplifier will occur during a downpour or snow storm.


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] KPA1500 SWR meter

[Edward R Cole]

Mike,

You mention this occurs when interior temp reaches 50c (122F).  Just 
a guess that a device in the SWR ckt or indicator driver is changing 
bias with temp and giving a false indication.  This is really a 
question for Elecraft Tech Dept.  I I am correct in my supposition 
they, already know about it.


Might be a need for better air circulation for the amp, if so.

73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] KPA1500 Utility Setup

[Bill Johnson]

You may have the firewall settings high enough that the programs require: 
either 1) run as an administrator or, 2) allow the program through your 
firewall since these are all "*.exe" programs which are generally highly 
suspect on the internet and blocked, unless you give specific permissions.  

73,
Bill
K9YEQ

https://wrj-tech.com/

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of N2TK, Tony
Sent: Sunday, April 29, 2018 5:05 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Utility Setup

When I try to install the "KPA1500 Utility Setup 1-18-3-15" I get a message 
that "This app can't run on your PC. To find a version for your PC, check with 
the software publisher"

 

The PC is a i7, 64-bit operating system running Win 10 Pro.

What am I missing or doing wrong? Did I miss something in the archives?

Tnx

N2TK, Tony  

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Re: [Elecraft] KPA500/K3 AUX bus specification

[Ken K6MR]

Proprietary.  I’ve decoded a couple of messages, but AFAIK there is no 
publication.



Ken K6MR




From: elecraft-boun...@mailman.qth.net  on 
behalf of ANDY DURBIN 
Sent: Sunday, April 29, 2018 1:59:47 PM
To: elecraft@mailman.qth.net
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
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Re: [Elecraft] KAT-500 Bypass SWR seems wrong

[Don Wilhelm]

Harv,

If you have resonant antennas, you should set the tuner in the KPA1500 
to bypass when those antennas are selected.  That will bypass the L/C 
elements in the tuner in the KPA1500.


73,
Don W3FPR

On 4/29/2018 5:04 PM, Bob Harvey - K2PI wrote:

Hi Don:

No, I have not set them to bypass.  I do not understand why I would since
these are resonant antennas that I wish to use on those bands.  Am I
misunderstanding you, or wasn't my post clear?

These antennas have actual SWR's that are lower than the KAT-500 reports as
the "bypass SWR".  Why should that be?

73
Harv
k2PI



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[Elecraft] FS - K2 belonging to WB3AAL (SK)

[Don Wilhelm]

Hello All,

It is with deep regret that I heard of the passing of Ron Polytika WB3AAL.

About a week before he passed, he sent his K2 to me to install one of 
his K6XX CW Tuning indicators.  Unfortunately, he passed away before I 
could get to it.


I talked with Susan (Ron's XYL) this afternoon, and we agreed that I 
should try to sell Ron's K2/10.  She offered to give me a share of the 
proceeds, but I will not, the full proceeds minus shipping costs will go 
to the widow.


This is K2/10 SN 1392.  It has the K160RX, KNB2, KSB2 and KAT2 options 
installed.  It also has the 73CNC VFO knob installed.
The BFOMDKT and Thermistor Mod have been installed, but no other upgrade 
mods have been done.  The firmware level is 2.01MCU and 1.02 KIOC.

The unbuilt K6XX CW Tuning kit with button LED is also part of the package.

I believe a decent asking price for this package is $500.00 including 
shipping to any QTH with a US shipping address.  International shipment 
will be at additional cost.


I will checkout this K2 and do an alignment and calibration at no extra 
cost to assure you that you are buying a fully functional K2/10.


I can also upgrade it to the current level and/or build and install the 
K6XX CW Tuning Indicator (at extra cost) if you desire.


Please respond directly to me at d...@w3fpr.com if you are interested or 
have additional questions.


73,
Don W3FPR
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[Elecraft] KPA1500 Utility Setup

[N2TK, Tony]

When I try to install the "KPA1500 Utility Setup 1-18-3-15" I get a message
that "This app can't run on your PC. To find a version for your PC, check
with the software publisher"

 

The PC is a i7, 64-bit operating system running Win 10 Pro.

What am I missing or doing wrong? Did I miss something in the archives?

Tnx

N2TK, Tony  

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Re: [Elecraft] KPA500/K3 AUX bus specification

[Don Wilhelm]

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: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on 
behalf of ANDY DURBIN [a.dur...@msn.com]
Sent: Sunday, April 29, 2018 3:59 PM
To: elecraft@mailman.qth.net
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.

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Re: [Elecraft] KPA500/K3 AUX bus specification

[hawley, charles j jr]

Page 25 of the KPA500 manual.
http://www.elecraft.com/manual/E740150%20KPA500%20Owner's%20man%20%20Rev%20D4.pdf

Chuck Hawley
 c-haw...@illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles

From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on 
behalf of ANDY DURBIN [a.dur...@msn.com]
Sent: Sunday, April 29, 2018 3:59 PM
To: elecraft@mailman.qth.net
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
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Re: [Elecraft] KAT-500 Bypass SWR seems wrong

[Bob Harvey - K2PI]

Hi Don:

No, I have not set them to bypass.  I do not understand why I would since
these are resonant antennas that I wish to use on those bands.  Am I
misunderstanding you, or wasn't my post clear?

These antennas have actual SWR's that are lower than the KAT-500 reports as
the "bypass SWR".  Why should that be?

73
Harv
k2PI



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[Elecraft] KPA500/K3 AUX bus specification

[ANDY DURBIN]

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
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[Elecraft] KX - 2nd Look

[Mike Herr]

Anyone out there building the KX - 2nd look? I just finished mine, but made
a lot of changes. Instead of the 2 x 40 character display, I used a 4 x 20
- why? Because I had one. Also, instead of the Nano Arduino I used a Mini
Pro - why? because I had one. Had a lot of rewire on the code, mostly due
to the change in the display but there were a couple of "issues" that
caused problems. Works nicely. Also added a 3d printed case.

-- 
Mike Herr
WA6ARA
DM-15dp
Home of The QRP Ranch

No trees were killed in the sending of this message, however, a large
number of electrons were terribly inconvenienced.


"Dad says that anyone who can't use a slide rule is a cultural illiterate
and should not be allowed to vote. Mine is a beauty - a K 20-inch Log-log
Duplex Decitrig." - Robert Heinlein
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Re: [Elecraft] KPA1500 SWR meter

[Don Wilhelm]

Mike,

Have you looked at the SWR report shown in KPA1500 Utility?
Try that and see whether it shows the same as the display.

There are 2 pieces to the SWR - there is the sensor part and then there 
is the display part.
There is a possibility that the sensor is doing OK, but the display end 
of things may be what is causing the problem.  KPA1500 Utility uses a 
different path (but the same sensor) for its display of SWR than the 
front panel display.


In either case, it does seem (by my first guess) that there is a solder 
or cable connection in the KPA1500 that is heat sensitive.


How high does the SWR go?  If it stays below 1.5, it will cause no 
problem despite your concern for that behavior.


Unless I am mistaken, the SWR indication on the K3 shows only the SWR of 
what is connected to the K3, which is the amplifier input


73,
Don W3FPR

On 4/29/2018 2:25 PM, Mike Crownover wrote:

Don,

Thanks for the comment. I’ve done that test and at low temps,~35c, no 
difference at 1500 or 500. I haven’t done it at high temps yet, but I 
would think if it were arcing, the temp of the amp wouldn’t matter, 
although I’m certainly no expert on these matters. Additionally, I 
would expect the SWR indicator on the screen to show the fluctuation 
as well. It never moves from 1.1:1.


Mike AD5A



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[Elecraft] KPA1500 SWR meter

[john]

If you're using the subject KPA1500, the K3S is only seeing the amp input
SWR.  

John KK9A

Carl Yaffey K8NU wrote:

I have experienced strange SWR indications (high SWR) when the SWR shows 1:1
on the K3S. Note: no ATU in the K3S.

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Re: [Elecraft] KPA1500 SWR meter

[Don Wilhelm]

Mike,

May I suggest you inspect all the connections in your antenna system.
There are connections that may be just fine at 500 watts, but will 
either break down or arc over at 1500 watts.


What happens if you drive the KPA1500 only to 500 watts?  If it behaves 
the same as it does at 1500 watts, then you may have a problem with the 
KPA1500, but if things behave normally at 500 watts, then look at your 
antenna system.


73,
Don W3FPR

On 4/29/2018 10:13 AM, Mike Crownover wrote:

I have noticed that after my KPA1500 gets above 50C the SWR indicator light 
starts to show intermittent high SWR. My KPA500 did not do that. I'm using 
resonant yagis and the digital SWR meter shows 1.1:1 and doesn't change nor 
does the SWR indicator on the K3S. It seems the SWR indicator lights are acting 
independent of the meter on the KPA1500 screen. RF? I have not had any faults 
or shut downs as a result of the indicated high SWR. The amp operates 
wonderfully, but the indicator lights are a bit bothersome. Anyone have similar 
issues?

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Re: [Elecraft] KPA1500 SWR meter

[Carl Yaffey]

I have experienced strange SWR indications (high SWR) when the SWR shows 1:1 on 
the K3S. Note: no ATU in the K3S.

> On Apr 29, 2018, at 10:13 AM, Mike Crownover  wrote:
> 
> I have noticed that after my KPA1500 gets above 50C the SWR indicator light 
> starts to show intermittent high SWR. My KPA500 did not do that. I'm using 
> resonant yagis and the digital SWR meter shows 1.1:1 and doesn't change nor 
> does the SWR indicator on the K3S. It seems the SWR indicator lights are 
> acting independent of the meter on the KPA1500 screen. RF? I have not had any 
> faults or shut downs as a result of the indicated high SWR. The amp operates 
> wonderfully, but the indicator lights are a bit bothersome. Anyone have 
> similar issues?
> 73,
> Mike AD5A
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Carl Yaffey  K8NU
Recording studio.
cyaffeyno_s...@gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com
http://www.bluesswing.com

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Re: [Elecraft] FW: How far can the KPA1500 amp be from the PS?

[Rick Tavan]

Although the KPA1500 can already be operated remotely, comfortably, using
KPA1500 Utility's Operate page, and although the eventual release of
KPA1500 Remote will be even better, I would advise against putting the amp
outdoors. Even if the housing is 100% water tight forever, Murphy almost
guarantees that the first failure that causes you to want to access the
amplifier will occur during a downpour or snow storm. Just run the 240 VAC
line into the shack somehow (and the 120 VAC line suggested by K9YC). Worst
case, you'll need to run conduit along a wall and maybe ceiling, perhaps
covered by a soffit. Some folks even put up a false wall of paneling in
front of an existing wall that they can't dig in to.

GL,

/Rick N6XI


Rick Tavan
Truckee, CA

On Sat, Apr 28, 2018 at 12:59 PM, Dauer, Edward  wrote:

>
> Thanks for the ideas, Mark.  The remote software idea is interesting.
> There is a 220 volt outlet already on the outside perimeter deck, which we
> had put in for the possibility of someday having a hot tub out there –
> which we never did.  I could put both the amp and the PS in some sort of
> lockable housing on the deck (which would require hiring a carpenter rather
> than an electrician.)  I will definitely keep an eye on the development of
> remote software for the KPA1500.
>
> I remember when we were building the house we asked our contractor about
> doing something which would have been unusual, I don’t now recall what.  I
> asked if it could be done.  His answer was like yours – “For enough money,
> I can do anything.”
>
> Ted, KN1CBR
>
> From: Mark Goldberg 
> Date: Saturday, April 28, 2018 at 1:29 PM
> To: "Dauer, Edward" 
> Cc: Dave AD6A , "elecraft@mailman.qth.net" <
> elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] How far can the KPA1500 amp be from the PS?
>
>
>
> On Sat, Apr 28, 2018 at 11:08 AM, Dauer, Edward > wrote:
> Placing both PS and amp where the 220 VAC outlet is accessible is
> possible; but then I wouldn't be able to see the amp while operating, which
> I would like to do.  Wouldn't feel comfortable with a 1500 watt amp running
> way out of sight.  It would also then be in the kitchen on a floor above.
> Not aesthetically the best that way, either.
>
> Due to some temporary relocation of my ham shack for a home refurbish, I
> am using my KPA500 remotely with the KPA500 remote software server running
> on a spare netbook near the amp, and the client running on a computer near
> the rig. There is one 100 ft long RG214 Coax between the KPA500 and the rig
> for RF and one 100 ft small coax with RCA connectors between them for PTT.
> The amp and autotuner are at the antenna feed and grounded well. The rig
> away on the other side of the house not so well RF grounded, but there is
> no RFI so far. That enables me to see the KPA500 status and change the band
> on the PC in the shack. They don't yet seem to have the remote software for
> the KPA1500 yet, but it is supposed to be coming.
>
> I would probably accept visible conduit to run power if you can't run it
> in the walls. As part of the refurbish, drywall was taken out and replaced
> and the texture matched so new plumbing and electrical could go in.  They
> also replaced insulation. That worked out well, but it was expensive. There
> is not really any such thing as can't if you have deep enough pockets!
>
> 73,
>
> Mark
> W7MLG
>
>
>
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[Elecraft] KPA1500 SWR meter

[Mike Crownover]

I have noticed that after my KPA1500 gets above 50C the SWR indicator light 
starts to show intermittent high SWR. My KPA500 did not do that. I'm using 
resonant yagis and the digital SWR meter shows 1.1:1 and doesn't change nor 
does the SWR indicator on the K3S. It seems the SWR indicator lights are acting 
independent of the meter on the KPA1500 screen. RF? I have not had any faults 
or shut downs as a result of the indicated high SWR. The amp operates 
wonderfully, but the indicator lights are a bit bothersome. Anyone have similar 
issues?
73,
Mike AD5A
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