Re: [Elecraft] KRC2 Band Decoder question

[Victor Rosenthal 4X6GP]

I have one which I've successfully used with my K3.
I did find that in a QRO environment, you should be careful with RF 
coming in on the outputs. I had to hang some ferrites on them to prevent 
erratic operation.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 08/03/2023 9:28, Jim Brown wrote:

On 3/7/2023 7:38 PM, AB2E Darrell wrote:

Are there any issues using this with a K3?


Not that I know of, Darrell, although there are a bunch of options 
covered in the manual. Should be on the website. W6GJB and I have been 
using a pair of KRC2s that N6RNO built to switch filter sets in his 
two-op contesting trailer. I'm usrf the single-coax feed from the AUX 
connector to the KRC2. Simplifies things a lot.


The KRC2 is a rather early product, and shielding is non-existent, 
thanks to paint everywhere between stuff that should be bonding (like 
the connectors, and joints between parts of the chassis. A metal chassis 
provides no shielding if cable shields are not bonded to the chassis at 
the point of entry, and if shielding is not continuous. I took them 
apart and used a LOT of sandpaper. :)


73, Jim K9YC




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Re: [Elecraft] KRC2 Band Decoder question

[Geert Jan de Groot]

On 08/03/2023 04:39, elecraft-requ...@mailman.qth.net wrote:

I picked up a KRC2 Band Decoder.
Are there any issues using this with a K3?
Does the stock DB9 cable to the rig need to be rewired for the K3?
I want to hook it up for FD with a bandpass filter set.


There are a number of ways to set up a KRC2, depending on how you want 
to interface it. With an Elecraft radio, you probably want to use the 
AUX bus.


On the K2, for which the KRC2 was originally designed, the AUX signal is 
on the DE9 serial connector (and it's one of the reasons you cannot use 
a "straight cable" connecting a K2 to a serial device!!!).


On the K3, the AUX signal is on the DE-15 ACC connector, NOT on the 
9-pin serial port. The KRC2 documentation got updated for this, be sure 
you have the errate document describing connection to the K3:

https://ftp.elecraft.com/KRC2/Manuals%20Downloads/KRC2_Manual_Errata_Rev_C4.pdf
So make sure you get the errata document.

73, Geert Jan PE1HZG
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Re: [Elecraft] KRC2 Band Decoder question

[Jim Brown]

On 3/7/2023 7:38 PM, AB2E Darrell wrote:

Are there any issues using this with a K3?


Not that I know of, Darrell, although there are a bunch of options 
covered in the manual. Should be on the website. W6GJB and I have been 
using a pair of KRC2s that N6RNO built to switch filter sets in his 
two-op contesting trailer. I'm usrf the single-coax feed from the AUX 
connector to the KRC2. Simplifies things a lot.


The KRC2 is a rather early product, and shielding is non-existent, 
thanks to paint everywhere between stuff that should be bonding (like 
the connectors, and joints between parts of the chassis. A metal chassis 
provides no shielding if cable shields are not bonded to the chassis at 
the point of entry, and if shielding is not continuous. I took them 
apart and used a LOT of sandpaper. :)


73, Jim K9YC




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[Elecraft] KRC2 Band Decoder question

[AB2E Darrell]

Hi all,
I picked up a KRC2 Band Decoder.
Are there any issues using this with a K3?
Does the stock DB9 cable to the rig need to be rewired for the K3?
I want to hook it up for FD with a bandpass filter set.
If anyone is using it with a K3 please email offlist.

Thanks and 73,
Darrell AB2E

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Re: [Elecraft] KRC2 problems

[Rich]

You can reload the FW

You need the:

KRC2 Download Utility (which should be available on the Elecraft Website

Rich

On 2/6/2022 8:34 AM, Gordon LaPoint wrote:
My KRC2 has a flashing LED at power on, the book says this means it 
needs a firmware load.  Can this be done by me or does it need a new 
microcontroller chip?


Thanks,

Gordon - N1MGO

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[Elecraft] KRC2 problems

[Gordon LaPoint]

My KRC2 has a flashing LED at power on, the book says this means it 
needs a firmware load.  Can this be done by me or does it need a new 
microcontroller chip?


Thanks,

Gordon - N1MGO

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Re: [Elecraft] KRC2 question

[Jack Brindle via Elecraft]

There is no “power off” indication sent to the Auxbus from the K3 or K4, so no, 
there isn’t a direct way for the KRC2 to know if the radio is off.
Having said that, my KRC2 is powered through a relay that is controlled by the 
K3’s +12V out jack. It is powered on with the K3 and likewise
powered off when the K3 is shut down. That causes the drivers to be shut down 
and all antennas disconnected.

73!
Jack, W6FB

> On Jan 16, 2022, at 8:42 AM, Gordon LaPoint  wrote:
> 
> When I shut off the radio (K4 or K3) the KRC2 stays selecting the antenna for 
> the freequency that was last sent from the radio over the Aux bus.
> 
> Is there any way to have the KRC2 remove any antenna selection when the radio 
> is turned off??
> 
> thanks,
> 
> Gordon - N1MGO
> 
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[Elecraft] KRC2 question

[Gordon LaPoint]

When I shut off the radio (K4 or K3) the KRC2 stays selecting the 
antenna for the freequency that was last sent from the radio over the 
Aux bus.


Is there any way to have the KRC2 remove any antenna selection when the 
radio is turned off??


thanks,

Gordon - N1MGO

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Re: [Elecraft] KRC2

[Paul GACEK via Elecraft]

Hi Geert 

Irrespective of Elecraft support position I have successfully run the code on 
Windows 10 PCs.

Here is my build and couple of snaps of it running on windows 10.

https://nomadic.blog/2019/01/07/suitcase-dxpedition-station-automation-step-1-the-elecraft-krc2/

Paul
W6PNG/M0SNA 

> On Jan 13, 2021, at 6:25 AM, Geert Jan de Groot  wrote:
> 
> 
>> Tom - I will give you some unsolicited advice-
> 
> Another point of consideration is that the KRC2 is programmable, but the 
> programming code is old and doesn't run on today's platforms.
> 
> "KRC2 Firmware Loader Supported Platforms Available for Windows 98, 2000, ME, 
> XP" - that's a while back.
> 
> I understand if Elecraft doesn't want to maintain these and wants to focus on 
> newer products, but publishing the interface would allow someone else to step 
> up and create a new tool. And today's new product will be obsolete in the 
> future, and having interfaces published increases the value of the product.
> 
> Geert Jan
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Re: [Elecraft] KRC2

[Gordon LaPoint]

I use the KRC2 programing software on Win10, pro an home, on two sites 
and it works fine.

Gordon - N1MGO

On 1/13/2021 9:24 AM, Geert Jan de Groot wrote:



Tom - I will give you some unsolicited advice-


Another point of consideration is that the KRC2 is programmable, but 
the programming code is old and doesn't run on today's platforms.


"KRC2 Firmware Loader Supported Platforms Available for Windows 98, 
2000, ME, XP" - that's a while back.


I understand if Elecraft doesn't want to maintain these and wants to 
focus on newer products, but publishing the interface would allow 
someone else to step up and create a new tool. And today's new product 
will be obsolete in the future, and having interfaces published 
increases the value of the product.


Geert Jan
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Re: [Elecraft] KRC2

[Geert Jan de Groot]

Tom - I will give you some unsolicited advice-


Another point of consideration is that the KRC2 is programmable, but the 
programming code is old and doesn't run on today's platforms.


"KRC2 Firmware Loader Supported Platforms Available for Windows 98, 
2000, ME, XP" - that's a while back.


I understand if Elecraft doesn't want to maintain these and wants to 
focus on newer products, but publishing the interface would allow 
someone else to step up and create a new tool. And today's new product 
will be obsolete in the future, and having interfaces published 
increases the value of the product.


Geert Jan
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Re: [Elecraft] KRC2 silkscreen gotcha

[Wes]

After writing this, I dug it out and without removing the board to inspect just 
powered it up and measured Pin 8 of U2 and found -8 something V.  So I guess 
it's okay.


Wes  N7WS



On 11/19/2020 1:45 PM, Wes wrote:
Thanks. I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS


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Re: [Elecraft] KRC2 silkscreen gotcha

[Rich]

My issue is getting mine to work with an Icom as a band decoder for my 
band pass filter.  At one time it worked great with my Pro III, but I 
cannot get it to work with the 7300.   Elecraft provided help to no 
avail either.   Everything checks out fine.


Rich

On 11/19/2020 18:41 PM, Paul Fletcher wrote:

Should be fine - you don’t have the issue I had.


On 19 Nov 2020, at 23:37, Rich > wrote:


Well I have a negative voltage on U2 pin8 but it is 3 volts higher 
than the manual.   Probably not an issue


Rich

On 11/19/2020 16:58 PM, Paul Fletcher wrote:
The circuit diagram and the parts placement in the manual are 
correct. On mine it was the silkscreen for R12 and R13 that was 
reversed. Let Jack do some digging as it’s possible (from his 
comments) that this doesn’t affect all boards. Mine only arrived a 
few days ago. The easy way to check if there is an issue is to check 
there is the correct negative voltage on pin 8 of U2. Mine was 
almost 0V before swapping the resistors.


On 19 Nov 2020, at 21:41, Rich > wrote:


Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is 
already not corrected


Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked 
like a champ with my K2 but not so with my KX3.


I’m going to crack open my krc2 shortly and see what values I have 
in those two resistor locations.


What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Nov 19, 2020, at 12:47 PM, Wes  wrote:

Thanks.  I've owned one of these for years and as I recall, it's 
always been a problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on 
a KRC2:


R12 and R13 are transposed on the silkscreen on the PCB. I fell 
foul of this
when I recently built my KRC2 and it wouldn't communicate. After 
quick probe
around it was evident there was no negative voltage to the RS232 
driver, U2.
A little further probing revealed no 12V present at R13 but 
there was at
R12. It was then I realised the component layout in the manual 
is different
to that marked on the PCB. A quick swap of resistors and 
everything works as

it should.

I've re-read the errata and the manual and there is no reference 
to this
issue. Apologies if it's been flagged up on here already but I 
couldn't find
anyone pointing this out though there do seem to be a few people 
with serial

comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

[Paul Fletcher via Elecraft]

Should be fine - you don’t have the issue I had.


> On 19 Nov 2020, at 23:37, Rich  wrote:
> 
> Well I have a negative voltage on U2 pin8 but it is 3 volts higher than the 
> manual.   Probably not an issue
> 
> Rich
> 
> On 11/19/2020 16:58 PM, Paul Fletcher wrote:
>> The circuit diagram and the parts placement in the manual are correct. On 
>> mine it was the silkscreen for R12 and R13 that was reversed. Let Jack do 
>> some digging as it’s possible (from his comments) that this doesn’t affect 
>> all boards. Mine only arrived a few days ago. The easy way to check if there 
>> is an issue is to check there is the correct negative voltage on pin 8 of 
>> U2. Mine was almost 0V before swapping the resistors.
>> 
>>> On 19 Nov 2020, at 21:41, Rich >> > wrote:
>>> 
>>> Thanks for the info.   Could you post the correct value of R12 and R13?
>>> 
>>> Mine was back at Elecraft way back.   I want to make sure it is already not 
>>> corrected
>>> 
>>> Based on your info R12 should be 47ohm, correct?
>>> 
>>> 
>>> Thanks
>>> 
>>> Rich
>>> 
>>> On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:
 Hi Paul
 
 Thanks for the heads up.
 
 I had some communication issues with my KRC2 in that it worked like a 
 champ with my K2 but not so with my KX3.
 
 I’m going to crack open my krc2 shortly and see what values I have in 
 those two resistor locations.
 
 What radio where you using with the KRC2?
 
 Paul
 W6PNG/M0SNA
 www.nomadic.blog 
 
> On Nov 19, 2020, at 12:47 PM, Wes  
>  wrote:
> 
> Thanks.  I've owned one of these for years and as I recall, it's always 
> been a problem so it's been resigned to the junk box.
> 
> Maybe I can resurrect it to make it useful for something.
> 
> Wes  N7WS
> 
>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of 
>> this
>> when I recently built my KRC2 and it wouldn't communicate. After quick 
>> probe
>> around it was evident there was no negative voltage to the RS232 driver, 
>> U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is 
>> different
>> to that marked on the PCB. A quick swap of resistors and everything 
>> works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't 
>> find
>> anyone pointing this out though there do seem to be a few people with 
>> serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
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Re: [Elecraft] KRC2 silkscreen gotcha

[Rich]

Well I have a negative voltage on U2 pin8 but it is 3 volts higher than 
the manual.   Probably not an issue


Rich

On 11/19/2020 16:58 PM, Paul Fletcher wrote:
The circuit diagram and the parts placement in the manual are correct. 
On mine it was the silkscreen for R12 and R13 that was reversed. Let 
Jack do some digging as it’s possible (from his comments) that this 
doesn’t affect all boards. Mine only arrived a few days ago. The easy 
way to check if there is an issue is to check there is the correct 
negative voltage on pin 8 of U2. Mine was almost 0V before swapping 
the resistors.


On 19 Nov 2020, at 21:41, Rich > wrote:


Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is 
already not corrected


Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like 
a champ with my K2 but not so with my KX3.


I’m going to crack open my krc2 shortly and see what values I have 
in those two resistor locations.


What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Nov 19, 2020, at 12:47 PM, Wes  wrote:

Thanks.  I've owned one of these for years and as I recall, it's 
always been a problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on a 
KRC2:


R12 and R13 are transposed on the silkscreen on the PCB. I fell 
foul of this
when I recently built my KRC2 and it wouldn't communicate. After 
quick probe
around it was evident there was no negative voltage to the RS232 
driver, U2.
A little further probing revealed no 12V present at R13 but there 
was at
R12. It was then I realised the component layout in the manual is 
different
to that marked on the PCB. A quick swap of resistors and 
everything works as

it should.

I've re-read the errata and the manual and there is no reference 
to this
issue. Apologies if it's been flagged up on here already but I 
couldn't find
anyone pointing this out though there do seem to be a few people 
with serial

comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

[Paul Fletcher via Elecraft]

The circuit diagram and the parts placement in the manual are correct. On mine 
it was the silkscreen for R12 and R13 that was reversed. Let Jack do some 
digging as it’s possible (from his comments) that this doesn’t affect all 
boards. Mine only arrived a few days ago. The easy way to check if there is an 
issue is to check there is the correct negative voltage on pin 8 of U2. Mine 
was almost 0V before swapping the resistors.

> On 19 Nov 2020, at 21:41, Rich  wrote:
> 
> Thanks for the info.   Could you post the correct value of R12 and R13?
> 
> Mine was back at Elecraft way back.   I want to make sure it is already not 
> corrected
> 
> Based on your info R12 should be 47ohm, correct?
> 
> 
> Thanks
> 
> Rich
> 
> On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:
>> Hi Paul
>> 
>> Thanks for the heads up.
>> 
>> I had some communication issues with my KRC2 in that it worked like a champ 
>> with my K2 but not so with my KX3.
>> 
>> I’m going to crack open my krc2 shortly and see what values I have in those 
>> two resistor locations.
>> 
>> What radio where you using with the KRC2?
>> 
>> Paul
>> W6PNG/M0SNA
>> www.nomadic.blog
>> 
>>> On Nov 19, 2020, at 12:47 PM, Wes  wrote:
>>> 
>>> Thanks.  I've owned one of these for years and as I recall, it's always 
>>> been a problem so it's been resigned to the junk box.
>>> 
>>> Maybe I can resurrect it to make it useful for something.
>>> 
>>> Wes  N7WS
>>> 
 On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
 FAO anyone who's had issues getting the serial comms working on a KRC2:
 
 R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of 
 this
 when I recently built my KRC2 and it wouldn't communicate. After quick 
 probe
 around it was evident there was no negative voltage to the RS232 driver, 
 U2.
 A little further probing revealed no 12V present at R13 but there was at
 R12. It was then I realised the component layout in the manual is different
 to that marked on the PCB. A quick swap of resistors and everything works 
 as
 it should.
 
 I've re-read the errata and the manual and there is no reference to this
 issue. Apologies if it's been flagged up on here already but I couldn't 
 find
 anyone pointing this out though there do seem to be a few people with 
 serial
 comms issues with the KRC2.
 
 Hopefully this is of assistance to someone.
 
 73 Paul M1PAF
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Re: [Elecraft] KRC2 silkscreen gotcha

[Jack Brindle via Elecraft]

Please do. Also, please also send a picture of the label on the bottom side 
closest to the front of the device.

Jack, W6FB
Elecraft Engineering


> On Nov 19, 2020, at 1:47 PM, Paul Fletcher  wrote:
> 
> I have a Rev C PCB and the silkscreen does not match the diagram in the Rev C 
> manual. On the PCB R12 and R13 are marked the opposite way round to the 
> manual. I can send pics if you want them.
> 
>> On 19 Nov 2020, at 21:33, Jack Brindle  wrote:
>> 
>> After seeing this report I pulled the Rev C PCB (the only PCB we have 
>> shipped for this product) and took a good look at it, then looked at the 
>> docs and finally the Gerbers for the board.
>> R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the 
>> switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 
>> line to -12V.
>> R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor 
>> (yellow-violet-black) and provides +12V power for the JFET.
>> The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct.
>> 
>> Now, what caused you to think they were backwards? And, let’s make sure that 
>> you do have a Rev C board in your KRC2.
>> 
>> 73,
>> Jack, W6FB
>> 
>>> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft 
>>>  wrote:
>>> 
>>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>>> 
>>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>>> around it was evident there was no negative voltage to the RS232 driver, U2.
>>> A little further probing revealed no 12V present at R13 but there was at
>>> R12. It was then I realised the component layout in the manual is different
>>> to that marked on the PCB. A quick swap of resistors and everything works as
>>> it should.
>>> 
>>> I've re-read the errata and the manual and there is no reference to this
>>> issue. Apologies if it's been flagged up on here already but I couldn't find
>>> anyone pointing this out though there do seem to be a few people with serial
>>> comms issues with the KRC2.
>>> 
>>> Hopefully this is of assistance to someone.
>>> 
>>> 73 Paul M1PAF
>>> 
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>> 
> 

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Re: [Elecraft] KRC2 silkscreen gotcha

[Paul Fletcher via Elecraft]

I have a Rev C PCB and the silkscreen does not match the diagram in the Rev C 
manual. On the PCB R12 and R13 are marked the opposite way round to the manual. 
I can send pics if you want them.

> On 19 Nov 2020, at 21:33, Jack Brindle  wrote:
> 
> After seeing this report I pulled the Rev C PCB (the only PCB we have shipped 
> for this product) and took a good look at it, then looked at the docs and 
> finally the Gerbers for the board.
> R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the 
> switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 
> line to -12V.
> R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor 
> (yellow-violet-black) and provides +12V power for the JFET.
> The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct.
> 
> Now, what caused you to think they were backwards? And, let’s make sure that 
> you do have a Rev C board in your KRC2.
> 
> 73,
> Jack, W6FB
> 
>> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft 
>>  wrote:
>> 
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>> around it was evident there was no negative voltage to the RS232 driver, U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is different
>> to that marked on the PCB. A quick swap of resistors and everything works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't find
>> anyone pointing this out though there do seem to be a few people with serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
>> 
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Re: [Elecraft] KRC2 silkscreen gotcha

[Gordon LaPoint]

I have two KRC2's, one uses the aux-bus line with a K3 and the other 
uses the RS232 with a Kenwood TS590sg. The only problems I have had are 
all self induced with programing errors!
They both work flawlessly and have for years, one drives a WX0b Six Pak, 
the other drives a MFJ RCS-20Lx switch.

Gordon - N1MGO

On 11/19/2020 16:26 PM, Paul Fletcher via Elecraft wrote:

Hi Paul,

I’ve not used it with a radio yet, this was to communicate with a PC to 
configure the KRC2 (though the same issue would apply to anything using RS232). 
The KRC2 wasn’t responding at all hence the start of fault finding and the 
findings I posted. As soon as the resistors were corrected everything worked as 
it should without issue.

Hope this helps.

73 Paul M1PAF


On 19 Nov 2020, at 20:52, Paul GACEK via Elecraft  
wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ 
with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two 
resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Nov 19, 2020, at 12:47 PM, Wes mailto:wes_n...@triconet.org>> wrote:

Thanks.  I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.

Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

[Rich]

Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is already 
not corrected


Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ 
with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two 
resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog


On Nov 19, 2020, at 12:47 PM, Wes  wrote:

Thanks.  I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.

Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

[Jack Brindle via Elecraft]

After seeing this report I pulled the Rev C PCB (the only PCB we have shipped 
for this product) and took a good look at it, then looked at the docs and 
finally the Gerbers for the board.
R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the 
switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 
line to -12V.
R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor 
(yellow-violet-black) and provides +12V power for the JFET.
The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct.

Now, what caused you to think they were backwards? And, let’s make sure that 
you do have a Rev C board in your KRC2.

73,
Jack, W6FB

> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft 
>  wrote:
> 
> FAO anyone who's had issues getting the serial comms working on a KRC2:
> 
> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
> when I recently built my KRC2 and it wouldn't communicate. After quick probe
> around it was evident there was no negative voltage to the RS232 driver, U2.
> A little further probing revealed no 12V present at R13 but there was at
> R12. It was then I realised the component layout in the manual is different
> to that marked on the PCB. A quick swap of resistors and everything works as
> it should.
> 
> I've re-read the errata and the manual and there is no reference to this
> issue. Apologies if it's been flagged up on here already but I couldn't find
> anyone pointing this out though there do seem to be a few people with serial
> comms issues with the KRC2.
> 
> Hopefully this is of assistance to someone.
> 
> 73 Paul M1PAF
> 
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Re: [Elecraft] KRC2 silkscreen gotcha

[Paul Fletcher via Elecraft]

Hi Paul,

I’ve not used it with a radio yet, this was to communicate with a PC to 
configure the KRC2 (though the same issue would apply to anything using RS232). 
The KRC2 wasn’t responding at all hence the start of fault finding and the 
findings I posted. As soon as the resistors were corrected everything worked as 
it should without issue.

Hope this helps.

73 Paul M1PAF

> On 19 Nov 2020, at 20:52, Paul GACEK via Elecraft  
> wrote:
> 
> Hi Paul
> 
> Thanks for the heads up.
> 
> I had some communication issues with my KRC2 in that it worked like a champ 
> with my K2 but not so with my KX3.
> 
> I’m going to crack open my krc2 shortly and see what values I have in those 
> two resistor locations.
> 
> What radio where you using with the KRC2?
> 
> Paul
> W6PNG/M0SNA 
> www.nomadic.blog 
> 
>> On Nov 19, 2020, at 12:47 PM, Wes > > wrote:
>> 
>> Thanks.  I've owned one of these for years and as I recall, it's always 
>> been a problem so it's been resigned to the junk box.
>> 
>> Maybe I can resurrect it to make it useful for something.
>> 
>> Wes  N7WS
>> 
>>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>>> 
>>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>>> around it was evident there was no negative voltage to the RS232 driver, U2.
>>> A little further probing revealed no 12V present at R13 but there was at
>>> R12. It was then I realised the component layout in the manual is different
>>> to that marked on the PCB. A quick swap of resistors and everything works as
>>> it should.
>>> 
>>> I've re-read the errata and the manual and there is no reference to this
>>> issue. Apologies if it's been flagged up on here already but I couldn't find
>>> anyone pointing this out though there do seem to be a few people with serial
>>> comms issues with the KRC2.
>>> 
>>> Hopefully this is of assistance to someone.
>>> 
>>> 73 Paul M1PAF
>> 
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Re: [Elecraft] KRC2 silkscreen gotcha

[Paul GACEK via Elecraft]

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ 
with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two 
resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA 
www.nomadic.blog

> On Nov 19, 2020, at 12:47 PM, Wes  wrote:
> 
> Thanks.  I've owned one of these for years and as I recall, it's always been 
> a problem so it's been resigned to the junk box.
> 
> Maybe I can resurrect it to make it useful for something.
> 
> Wes  N7WS
> 
>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>> around it was evident there was no negative voltage to the RS232 driver, U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is different
>> to that marked on the PCB. A quick swap of resistors and everything works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't find
>> anyone pointing this out though there do seem to be a few people with serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
> 
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Re: [Elecraft] KRC2 silkscreen gotcha

[Wes]

Thanks.  I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS

On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:

FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF


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[Elecraft] KRC2 silkscreen gotcha

[Paul Fletcher via Elecraft]

FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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[Elecraft] KRC2 wanted

[barry halterman]

Anyone have a KRC2 in working condx willing to sell, built or unbuilt?
Contact me off the forum please.
Thx
Barry
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Re: [Elecraft] KRC2 Manual Errata??

[Jack Brindle via Elecraft]

Rich;

The KRC2 manual is correct. It is a matter of understanding the frame of 
reference for the markings. The KRC2 was originally designed as a peripheral 
for the K2, so the interface ports use the K2 I/O port details. On the KRC2 
schematic, 8R, VRDET, 12CTRL, ALC and AUXBUS are all K2 signals that the KRC2 
can use for various functions. When used with other transceivers, they are 
repurposed (the benefits of using a microprocessor) to make best use of that 
device. 

The KRC2’s Icom band voltage sensing makes use of  a feature of the processor, 
that is a voltage reference pin that exists only on the AN3 port, which is 
connected to pin 4 of the DE9 connectors. This particular setup was added late 
in KRC2 development to resolve issues with Icom’s band voltage system. It 
requires that the actual band voltage be connected to ANA1 of the micro, which 
is pin 9 (marked 8R) on the DE9 connector. Again, the 8R and ALC schematic 
markings have nothing to do with Icom signals, but reflect signals on the K2 IO 
port.

I will communicate with you directly to try to resolve your issues shortly. We 
sometimes make mistakes, and this question caused me to recheck the schematics 
and code, but rest assured that in this case the manual and schematic are 
correct.

73!
Jack, W6FB


> On May 20, 2020, at 3:34 PM, Rich  wrote:
> 
> I had been in conversation with Elecraft Tech Support, but I have not heard 
> back from them in three weeks.   So I will throw this out to the group.
> 
> It appears that there is an error in the KRC2 manual and it is not shown in 
> the Errata sheet.
> 
> On page 24 the manual states the following when connecting the KRC2 to an 
> Icom radio:
> 
> "For this reason it is recommended that the reference input setup be used. In 
> this configuration, the band data is connected to pin 9 and the 8 volt 
> reference is connected to pin 4. This mode is set with jumpers W1, W2 and W3 
> installed."
> 
> Directly below that statement this statement appears which confirms the first 
> statement:
> 
> "• Analog band input on J1/2 pin 9 with reference voltage on J1/2 pin 4:"
> 
> If you look at the schematic it shows Pin 9 as Reference voltage (8v) and Pin 
> 4 ALC (band voltage)
> 
> So they are reversed.
> 
> Since the wording and the schematic disagree.
> 
> Does anybody have any idea which is correct?
> 
> My unit is not working properly.  I sent it in for repair but 1 hour of labor 
> is about the cost of the unit.  So they returned it and I am trying to 
> troubleshoot it myself
> 
> Rich
> 
> K3RWN
> 
> 
> 
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Re: [Elecraft] KRC2 Manual Errata??

[Wayne Burdick]

Hi Rich,

I copied this to the designer of the KRC2 to get his input/suggestions.

73,
Wayne
N6KR


> On May 20, 2020, at 3:34 PM, Rich  wrote:
> 
> I had been in conversation with Elecraft Tech Support, but I have not heard 
> back from them in three weeks.   So I will throw this out to the group.
> 
> It appears that there is an error in the KRC2 manual and it is not shown in 
> the Errata sheet.
> 
> On page 24 the manual states the following when connecting the KRC2 to an 
> Icom radio:
> 
> "For this reason it is recommended that the reference input setup be used. In 
> this configuration, the band data is connected to pin 9 and the 8 volt 
> reference is connected to pin 4. This mode is set with jumpers W1, W2 and W3 
> installed."
> 
> Directly below that statement this statement appears which confirms the first 
> statement:
> 
> "• Analog band input on J1/2 pin 9 with reference voltage on J1/2 pin 4:"
> 
> If you look at the schematic it shows Pin 9 as Reference voltage (8v) and Pin 
> 4 ALC (band voltage)
> 
> So they are reversed.
> 
> Since the wording and the schematic disagree.
> 
> Does anybody have any idea which is correct?
> 
> My unit is not working properly.  I sent it in for repair but 1 hour of labor 
> is about the cost of the unit.  So they returned it and I am trying to 
> troubleshoot it myself
> 
> Rich
> 
> K3RWN
> 
> 
> 
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[Elecraft] KRC2 Manual Errata??

[Rich]

I had been in conversation with Elecraft Tech Support, but I have not 
heard back from them in three weeks.   So I will throw this out to the 
group.


It appears that there is an error in the KRC2 manual and it is not shown 
in the Errata sheet.


On page 24 the manual states the following when connecting the KRC2 to 
an Icom radio:


"For this reason it is recommended that the reference input setup be 
used. In this configuration, the band data is connected to pin 9 and the 
8 volt reference is connected to pin 4. This mode is set with jumpers 
W1, W2 and W3 installed."


Directly below that statement this statement appears which confirms the 
first statement:


"• Analog band input on J1/2 pin 9 with reference voltage on J1/2 pin 4:"

If you look at the schematic it shows Pin 9 as Reference voltage (8v) 
and Pin 4 ALC (band voltage)


So they are reversed.

Since the wording and the schematic disagree.

Does anybody have any idea which is correct?

My unit is not working properly.  I sent it in for repair but 1 hour of 
labor is about the cost of the unit.  So they returned it and I am 
trying to troubleshoot it myself


Rich

K3RWN



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Re: [Elecraft] KRC2 setup for Icom

[Jack Brindle via Elecraft]

Let me explain a bit more. The KRC2 followed the same thinking as the K2 - we 
put non-RS232 signals on the DE9 pins. That means that only pins 2 and 3 should 
see those signals, but not the others. I remember there being a warning in the 
manual about this, but I don’t find it at this point. We will have to do 
something about that. We have kicked ourselves many times for using this 
connector arrangement. As they say, that is water under the bridge.

Unfortunately jumpers W11, W12, W19 and W20 do connect DE9 pins 4 and 9 to the 
micro, through 10K dividers, meaning that if RS-232 signals are connected, they 
will only be at half voltage. Thus the microcontroller is at risk.
But, lets see if it is actually damaged by setting things up properly.

The description on page 24 of the KRC2 manual sets up both connectors for use 
with Icom band voltages. I would suggest using only one of the DE9s for the 
Icom signals, and leaving the other set up for computer use. Using the XCVR 
port for the Icom data, remove W11 and W12 and leave W19 and W20 jumpered. You 
will then want to have jumpers W9 and W10 inserted to allow the computer to 
talk to the KRC2 using the PC port. Make absolutely sure you only use a three 
pin cable for this one (this is more of a warning to others following this 
thread).

If you used the opposite connector for the Icom voltage, the jumper settings 
become:
Icom voltages connected to PC port: Remove WW9, W10, W19, W20, Insert W11, W12 
(for Icom data) and W21 and W23 for computer data on the XCVR port.

There have not been any updates to the KRC2 firmware since V1.6, so you have 
the latest. If you would like to use the KRC2 Utility to change the band maps, 
you will most likely want to have jumpers W7 and W8 removed to use 4800 bps 
communications. I don’t remember if the utility allows any other data rate, but 
that is currently the best one to use to communicate with the KRC2 with the 
utility.

You should have the connections correct, with Icom Band Voltage on pin 9 and 
Reference voltage on pin 4.

Let me know how this works for you. 

73,
Jack, W6FB

> On Apr 21, 2020, at 4:17 PM, Rich  wrote:
> 
> Installed Jumpers
> 
> W1,2,3   W11,12, 19,20
> 
> DB9 from Icom Radio  Pin 4= 8v ref,  Pin9= Icom Band Voltage Pin1=GND
> 
> Do you mean a straight through cable from PC to KRC2?   I am sure I did not 
> break anything.  I only had Pin 2 and 3 set for straight and null.   Those 
> pins should certainly not have 12v on them.  I hope
> 
> Rich
> 
> On 4/21/2020 18:58 PM, Jack Brindle wrote:
>> Rich;
>> 
>> What are the jumper settings in the KRC2?
>> 
>> It is _very_ important not to use a straight-through cable with the KRC2. As 
>> documented in the KRC2 manual, the pins are connected to the 
>> microcontroller, and the +/- 12 V excursions of the RS-232 levels will 
>> damage the microcontroller I/O pins.
>> 
>> There are two voltages you need from the Icom, the band Voltage, and the 
>> reference voltage. The band voltage output from some Icom radios have been 
>> shown to drift during transmit, so much that they may show a completely 
>> different band. For this reason the band reference voltage (+8V) needs to be 
>> used. It is this voltage that drifts, and thus the Band voltage follows.
>> 
>> With that in mind, the W9 - W22 jumper settings are important and will 
>> connect/disconnec the various pins to the DE9 connectors from the 
>> microcontroller.
>> 
>> 73!
>> Jack, W6FB
>> 
>> 
>>> On Apr 21, 2020, at 3:11 PM, Rich  wrote:
>>> 
>>> Does anyone have any experience using the KRC2 with an Icom radio?  This is 
>>> a working KRC2 that was on a K3 at one time.
>>> 
>>> To start I cannot get the KRC2 to connect to my PC.  I have used straight 
>>> through cable, Null modem Cable and a USB to Serial Cable.  I have run the 
>>> program on an old XP laptop and my Win10 machine.   I have even used a 
>>> "real" comport.  None of those configurations will connect to the device.   
>>> The DL switch is set properly.
>>> 
>>> The KRC2 passes all of the manual button press tests.
>>> 
>>> I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending the 
>>> band voltage to the unit as measured with a Volt meter.
>>> 
>>> Do you really need the computer to make it work?  I am thinking that is 
>>> mainly for firmware and antenna relay settings
>>> 
>>> I am just trying to control a 419B bandpass filter.
>>> 
>>> Any thoughts?
>>> 
>>> Rich
>>> 
>>> K3RWN
>>> 
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Re: [Elecraft] KRC2 setup for Icom

[Rich]

I have tried 4800,9600,19200 jumper settings and set the software 
appropriately.   None work.


I would think I do not need to do anything FW wise as this unit has 1.6 
from way back when


Rich

On 4/21/2020 19:11 PM, Don Wilhelm wrote:

Rich,

What baud rate are you trying to use?  The KRC2 is limited to 19.2k.
Double check the jumpers for the RS232 port.
Follow the instructions in the manual to download the firmware.
You only need to connect the KRC2 to the computer for firmware, but 
you can connect the serial port on the ICOM through the KRC2 (but the 
speed needs to be limited to 19.2k.


I see Jack Brindle sent a response - he is the designer and therefore 
the expert.


73,
Don W3FPR

On 4/21/2020 6:11 PM, Rich wrote:
Does anyone have any experience using the KRC2 with an Icom radio?  
This is a working KRC2 that was on a K3 at one time.


To start I cannot get the KRC2 to connect to my PC.  I have used 
straight through cable, Null modem Cable and a USB to Serial Cable.  
I have run the program on an old XP laptop and my Win10 machine.   I 
have even used a "real" comport.  None of those configurations will 
connect to the device.   The DL switch is set properly.


The KRC2 passes all of the manual button press tests.

I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending 
the band voltage to the unit as measured with a Volt meter.



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Re: [Elecraft] KRC2 setup for Icom

[Rich]

Installed Jumpers

W1,2,3   W11,12, 19,20

DB9 from Icom Radio  Pin 4= 8v ref,  Pin9= Icom Band Voltage Pin1=GND

Do you mean a straight through cable from PC to KRC2?   I am sure I did 
not break anything.  I only had Pin 2 and 3 set for straight and null.   
Those pins should certainly not have 12v on them.  I hope


Rich

On 4/21/2020 18:58 PM, Jack Brindle wrote:

Rich;

What are the jumper settings in the KRC2?

It is _very_ important not to use a straight-through cable with the KRC2. As 
documented in the KRC2 manual, the pins are connected to the microcontroller, 
and the +/- 12 V excursions of the RS-232 levels will damage the 
microcontroller I/O pins.

There are two voltages you need from the Icom, the band Voltage, and the 
reference voltage. The band voltage output from some Icom radios have been 
shown to drift during transmit, so much that they may show a completely 
different band. For this reason the band reference voltage (+8V) needs to be 
used. It is this voltage that drifts, and thus the Band voltage follows.

With that in mind, the W9 - W22 jumper settings are important and will 
connect/disconnec the various pins to the DE9 connectors from the 
microcontroller.

73!
Jack, W6FB



On Apr 21, 2020, at 3:11 PM, Rich  wrote:

Does anyone have any experience using the KRC2 with an Icom radio?  This is a 
working KRC2 that was on a K3 at one time.

To start I cannot get the KRC2 to connect to my PC.  I have used straight through cable, 
Null modem Cable and a USB to Serial Cable.  I have run the program on an old XP laptop 
and my Win10 machine.   I have even used a "real" comport.  None of those 
configurations will connect to the device.   The DL switch is set properly.

The KRC2 passes all of the manual button press tests.

I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending the band 
voltage to the unit as measured with a Volt meter.

Do you really need the computer to make it work?  I am thinking that is mainly 
for firmware and antenna relay settings

I am just trying to control a 419B bandpass filter.

Any thoughts?

Rich

K3RWN

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Re: [Elecraft] KRC2 setup for Icom

[Don Wilhelm]

Rich,

What baud rate are you trying to use?  The KRC2 is limited to 19.2k.
Double check the jumpers for the RS232 port.
Follow the instructions in the manual to download the firmware.
You only need to connect the KRC2 to the computer for firmware, but you 
can connect the serial port on the ICOM through the KRC2 (but the speed 
needs to be limited to 19.2k.


I see Jack Brindle sent a response - he is the designer and therefore 
the expert.


73,
Don W3FPR

On 4/21/2020 6:11 PM, Rich wrote:
Does anyone have any experience using the KRC2 with an Icom radio?  This 
is a working KRC2 that was on a K3 at one time.


To start I cannot get the KRC2 to connect to my PC.  I have used 
straight through cable, Null modem Cable and a USB to Serial Cable.  I 
have run the program on an old XP laptop and my Win10 machine.   I have 
even used a "real" comport.  None of those configurations will connect 
to the device.   The DL switch is set properly.


The KRC2 passes all of the manual button press tests.

I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending the 
band voltage to the unit as measured with a Volt meter.



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Re: [Elecraft] KRC2 setup for Icom

[Jack Brindle via Elecraft]

Rich;

What are the jumper settings in the KRC2?

It is _very_ important not to use a straight-through cable with the KRC2. As 
documented in the KRC2 manual, the pins are connected to the microcontroller, 
and the +/- 12 V excursions of the RS-232 levels will damage the 
microcontroller I/O pins. 

There are two voltages you need from the Icom, the band Voltage, and the 
reference voltage. The band voltage output from some Icom radios have been 
shown to drift during transmit, so much that they may show a completely 
different band. For this reason the band reference voltage (+8V) needs to be 
used. It is this voltage that drifts, and thus the Band voltage follows.

With that in mind, the W9 - W22 jumper settings are important and will 
connect/disconnec the various pins to the DE9 connectors from the 
microcontroller.

73!
Jack, W6FB


> On Apr 21, 2020, at 3:11 PM, Rich  wrote:
> 
> Does anyone have any experience using the KRC2 with an Icom radio?  This is a 
> working KRC2 that was on a K3 at one time.
> 
> To start I cannot get the KRC2 to connect to my PC.  I have used straight 
> through cable, Null modem Cable and a USB to Serial Cable.  I have run the 
> program on an old XP laptop and my Win10 machine.   I have even used a "real" 
> comport.  None of those configurations will connect to the device.   The DL 
> switch is set properly.
> 
> The KRC2 passes all of the manual button press tests.
> 
> I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending the band 
> voltage to the unit as measured with a Volt meter.
> 
> Do you really need the computer to make it work?  I am thinking that is 
> mainly for firmware and antenna relay settings
> 
> I am just trying to control a 419B bandpass filter.
> 
> Any thoughts?
> 
> Rich
> 
> K3RWN
> 
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[Elecraft] KRC2 setup for Icom

[Rich]

Does anyone have any experience using the KRC2 with an Icom radio?  This 
is a working KRC2 that was on a K3 at one time.


To start I cannot get the KRC2 to connect to my PC.  I have used 
straight through cable, Null modem Cable and a USB to Serial Cable.  I 
have run the program on an old XP laptop and my Win10 machine.   I have 
even used a "real" comport.  None of those configurations will connect 
to the device.   The DL switch is set properly.


The KRC2 passes all of the manual button press tests.

I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending the 
band voltage to the unit as measured with a Volt meter.


Do you really need the computer to make it work?  I am thinking that is 
mainly for firmware and antenna relay settings


I am just trying to control a 419B bandpass filter.

Any thoughts?

Rich

K3RWN

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[Elecraft] KRC2 config program and Win 10?

[Gordon LaPoint]

I can not get the KRC2 configuration program to work on win 10, it keeps 
saying that mscomctl.ocx is missing.   I downloaded and registered the 
ocx file and still get the same error.  What is the secret to getting 
this to work?


Thanks,

Gordon - N1MGO

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[Elecraft] Elecraft KRC2 build snaps and short narrative

[Paul Gacek via Elecraft]

Like all on this list I like my Elecraft gear and have used it extensively for 
Summits on the Air (SOTA), the 2016 ARRL NPOTA event and now morphing into 
suitcase DXpeditions.

If interested in a few snaps and narrative check out my blog post at …..

https://w6png.wordpress.com/2019/01/07/suitcase-dxpedition-station-automation-step-1-the-elecraft-krc2/
 
<https://w6png.wordpress.com/2019/01/07/suitcase-dxpedition-station-automation-step-1-the-elecraft-krc2/>


Paul W6PNG/M0SNA


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Re: [Elecraft] krc2 jumpers setting ..help

[Robert Bajuk]

Hi Noel,

I can share my settings which work just fine with TS480 (it should work
also with TS590 models)... N1MM talks just fine with the radio with KRC in
the middle

You need some small modification inside KRC2 Here are the settings for
19200 baud-rate

Jumpers IN: 3, 6, 8, 9, 10, and 21, 22, 23
Jumpers 14 & 17 bridged with voltage from pin 7 of U2 fed to this jumper
(~2" piece of wire).

Hope it will solve your problem, try it and report back

73 Robert, S57AW


On Tue, Mar 27, 2018 at 10:12 PM, NOEL POULIN 
wrote:

> Hi,
> I am having a hard time with the KRC2 band decoder jumper settings for a
> KENWOOD TS590SG..
> Here is my setting according to the KRC2 manual (page 23)..for kenwood
> radio pc logging in use, data  rate 19200 bps
> INSTALLED REMOVED
> w3,w6,w8   w1,w2,w7,w11,
> w12,w13,w14,w15,w16,w17,w18,w19,w20
> w9,w10,w21,w22,w23.
> No luck with settings..
> The logging software is talking to the radio when the decoder is not
> between the radio and the pcbut when I connect the KRC2, no results,
> the logging software can't talk to the radio at all
>
> What have I done wrong ???
> Help will be more than welcome...
> Many thanks
> Noel
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[Elecraft] krc2 jumpers setting ..help

[NOEL POULIN]

Hi,
I am having a hard time with the KRC2 band decoder jumper settings for a 
KENWOOD TS590SG..
Here is my setting according to the KRC2 manual (page 23)..for kenwood 
radio pc logging in use, data  rate 19200 bps

INSTALLED REMOVED
w3,w6,w8   w1,w2,w7,w11, 
w12,w13,w14,w15,w16,w17,w18,w19,w20

w9,w10,w21,w22,w23.
No luck with settings..
The logging software is talking to the radio when the decoder is not 
between the radio and the pcbut when I connect the KRC2, no results, 
the logging software can't talk to the radio at all


What have I done wrong ???
Help will be more than welcome...
Many thanks
Noel
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[Elecraft] krc2

[NOEL POULIN]

Hi everybody,
I am looking for a KRC2 (band decoder) assembled...not in kit..
Please let me know your price, if you  have one for sale...
I am in CANADA.
Thanks
Noel
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[Elecraft] KRC2 does not communicate with CPU

[Gordon LaPoint]

I have 2 KRC2's, one is working correctly with my K3. The second one 
used to work, but now just blinks the LED slowly, about 1 sec. rate, 
when powered up.  If I switch the OP/DL switch to DL the LED turns off.  
I have no comms over the serial port with my computer.  I'm using the 
same setup as the one that works.


I tried to D/L new firmware, but it never finishes and the symptoms 
never change.   Is the PIC16F877 fried, or the serial interface chip 
(MAX1406)?


Any suggestions on what to try?

Thanks,

Gordon - N1MGO

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Re: [Elecraft] KRC2 with K3 and RemoteRig

[Paul Christensen]

>"The KRC2 connects quite nicely to the K3's AuxBus. In fact this is the
recommended method for using the KRC2 with the K3.
It will respond to the band change information the K3 sends on that medium.
The Auxbus is on the K3's AUX IO connector. As I recall, it is on pin 2,
with ground on Pin 5. See the KRC2 manual for more information.
If you have questions about the KRC2, just ask! - Jack, W6FB
Elecraft Engineering"

Jack, exactly what I needed.  Many thanks!

Paul, W9AC

-Original Message-
From: Paul Christensen [mailto:w...@arrl.net] 
Sent: Sunday, August 13, 2017 4:37 PM
To: 'elecraft@mailman.qth.net' <elecraft@mailman.qth.net>
Subject: KRC2 with K3 and RemoteRig

I have a need to automatically switch antennas based on the K3's band data.
Is it possible to use the Elecraft KRC2 device with the K3 + RemoteRig?  The
K3's RS232 port is already connected to the RemoteRig RRC unit.  What is
Elecraft's recommendation to accomplish data splitting between all three
units?  

Paul, W9AC 

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Re: [Elecraft] KRC2 with K3 and RemoteRig

[Jack Brindle]

The KRC2 connects quite nicely to the K3’s AuxBus. In fact this is the 
recommended method for using the KRC2 with the K3.
It will respond to the band change information the K3 sends on that medium.

The Auxbus is on the K3’s AUX IO connector. As I recall, it is on pin 2, with 
ground on Pin 5. See the KRC2 manual for more information.
If you have questions about the KRC2, just ask!

- Jack, W6FB
Elecraft Engineering


> On Aug 13, 2017, at 1:36 PM, Paul Christensen <w...@arrl.net> wrote:
> 
> I have a need to automatically switch antennas based on the K3's band data.
> Is it possible to use the Elecraft KRC2 device with the K3 + RemoteRig?  The
> K3's RS232 port is already connected to the RemoteRig RRC unit.  What is
> Elecraft's recommendation to accomplish data splitting between all three
> units?  
> 
> Paul, W9AC 
> 
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[Elecraft] KRC2 with K3 and RemoteRig

[Paul Christensen]

I have a need to automatically switch antennas based on the K3's band data.
Is it possible to use the Elecraft KRC2 device with the K3 + RemoteRig?  The
K3's RS232 port is already connected to the RemoteRig RRC unit.  What is
Elecraft's recommendation to accomplish data splitting between all three
units?  

Paul, W9AC 

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[Elecraft] KRC2 wanted

[George Cortez via Elecraft]

Anyone have a KRC2 They are willing to sell. I am in need of one.Thanks
George NE2I
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[Elecraft] KRC2 For Sale

[Dick via Elecraft]

I have a KRC2 band decoder and control kit for sale; asking $80 plus shipping 
(USA).
Am selling the KRC2 because I have 12 mono band antennas (6M - 160M plus 75M 
NVIS) and the KRC2 will only control 10 (10M - 160M).  Doing a bit of research 
(actually blind luck when perusing the Array Solutions web site) I found their 
Bandmaster III will control 12 antennas, and I picked one up at the Array 
Solutions booth in Dayton last week.
Though the KRC2 will work with several other manufacture's radios, I have only 
used it with a K3 (and now a K3S).  I have never had any problems or issues 
with it; I am the original owner, and it has always been in a smoke free 
environment.
For the K3/K3S (and I think all the Elecraft radios), control is best asserted 
by using the AuxBus; this requires one wire from the KRC2 connected to pin 2 on 
the AuxIO connector on the K3/K3S.
If interested, please fire off an email to me at either richarddw1...@yahoo.com 
or k8...@yahoo.com;  or feel free to call me on the land line (am an ARRL DXCC 
card checker, and my phone number can be found on the ARRL webpage).
Dick, K8ZTT   
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Re: [Elecraft] KRC2 and KX3

[Marcus Busch [DL1EKC]]

Hi folks,

I'm trying to interconnect my KX3 and KRC2. I read the posts on this topic 
dating 
back to early March. The KRC2 is a very versatile unit allowing parallel 
operation of 
band filters via the BCD outputs and antenna relays the same time. So I would 
really 
like to get the KRC2 running with my KX3.

I have the basic KX3 interoperating with the KRC2, but I had to bridge D9 on 
the 
KRC2. Without this bridge serial comms via the KRC2 doesn't work here. Also the 
KRC2 
utility does not find my KRC2 with 19200 bd but with slower speeds.

I have jumpers W9, W10, W22, W23, W3 and W8 in, all others out.

These are my configurations:

1) KX3 with KRC2

KRC2 and KX3 set to 19200 bd -> works

2) KX3 + PX3 with KRC2

KRC2 is set to 19200 bd, PX3 to 19200 bd and KX3 to 38400 bd -> works

Comment: It seems the PX3 is relaying the rs232 comms to the KX3 with 38400 bd, 
which 
is indepentend from the PX3<->PC line speed. However, with the PX3 switched off 
but 
still connected in-line the KX3 RS232 speed has to be set to 19200 bd (passive 
pass-through). It took me quite some time to figure this out :-) .

3) KX3 + PX3 + KXPA100 with KRC2

KRC2 is set to 19200 bd, PX3 to 19200 bd and KX3 to 38400 bd. The RS232 
connection 
chain is PC - KRC2 - KXPA100 - PX3 - KX3.

KRC2 operation works, but I cannot operate the KXPA100. Upon setting pa mode to 
on 
the KXPA100 switches on. But after a few seconds the KX3 menu entry switches 
back to 
off, after a few more seconds the KXPA100 switches off.

Note 1: When I disconnect the KRC2 from KXPA100 AND set the line speed in PX3 
to 
38400 bd, KXPA100 operation works.

Note 2: If I leave the PX3 line rate at 19200 bd, serial comms from PC to KX3 
is 
disrupted as long as the KXPA100 is on.

I know all this is a bit confusing and I have no clue how to solve this. Anyone 
here 
can give an advice?

Thanks for Your time.

VY 73

Marcus, DL1EKC

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[Elecraft] KRC2 and KX3

[Vic DiCiccio]

When Eric VA7DZ, Fred KE7X and I were all experimenting with KRC2s for 
our K3s, I also connected mine to the KX3 with the help of Jack Brindle, 
KRC2 expert.


Here's what I did to the KRC2 to make it work in between the KX3 and the 
computer:


1.  Set KX3 menu item RS232 to 19200b.  Set the appropriate software on 
the computer to 19,200 baud.


2.  Use only the following jumpers in the KRC2:  W3, W8, W9, W10, W21, 
W22, W23.


3.  Make a special jumper wire to go from the RS-232 connector side of 
W11, to the RS-232 connector side of W20.  This carries the DTR signal 
between the two RS-232 connectors without actually bringing it into the 
KRC2 circuit.  It's voltage is incompatible with the KRC2, but it needs 
to be "carried through" if you intend to break out the DTR signal to, 
say, key the KRC2 with a transistor (or perhaps use DTR for PTT, or you 
could figure out the RTS pin on the RS-232 if you prefer).


The circuit diagram in the KRC2 assembly and operating instructions 
booklet is very useful to help to understand the jumpers.  Normally, for 
a K3, you'd use W16 to enable the Auxbus in the KRC2.  W3 tells it to 
use the serial port, not the Auxbus. W8 sets it to 19,200 baud.  W9 and 
W10 carry the pin 2 and pin 3 data for RS-232.


As Jack said, it's important to only connect pins 2, 3, (both data) and 
5 (ground) to the KRC2 circuit because the other pins of RS-232 are 
electrically incompatible with the KRC2.


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Re: [Elecraft] KRC2 and KX3

[Jack Brindle]

This is not a good idea - the two are not compatible. The KX3 does not speak 
the auxbus protocol the KRC2 needs, plus the voltage levels are not compatible.
The best way to use the KRC2 with the KX3 is to use serial port communications. 
Realize the KRC2’s highest data rate is 19200 bps. Also remember that the KRC2 
does not implement the full EI-232 interface, so be sure to fabricate a cable 
that only connects pins 2, 3 and 5 to the radio (or computer).

Jack Brindle, W6FB
Elecraft Engineering

> On Mar 6, 2016, at 10:40 AM, Robert Vargas-KP4Y via Elecraft 
>  wrote:
> 
> Hello,
> 
> I'm trying to interface a KX3/KXPA with a kRC2 band decorder. Basically, I 
> built a cable to connect the AuxBus pin on the KRC2 XCVR port t the GPIO 
> input on the KX3-KXPA adapter cable, which is driven by KX3 ACC2 port. This 
> doesn't seem to be working and I'm not sure the right setting is enabled for 
> the ACC2 port to allow for AuxBus communications. Has anyone tried this? Any 
> help is appreciated
> 
> 73,
> Robert-KP4Y/W4
> 
> Sent from my iPhone
> 
> 
> Sent from my iPhone
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Re: [Elecraft] KRC2 and KX3

[Don Wilhelm]

Robert,

The KX3 ACC2 I/O menu parameter should be set to TRN CTRL.

The output of the KX3 ACC2 IO is 3 volt logic while to KRC2 uses 5 volt 
logic.  It may be that the AUXBUS signal from the KX3 is not properly 
switching the input of the KRC2.  You may have to add a 3V to 5V 
translation circuit.

Note that I have not tried the KRC2 with the KX3.

73,
Don W3FPR

On 3/6/2016 1:40 PM, Robert Vargas-KP4Y via Elecraft wrote:

Hello,

I'm trying to interface a KX3/KXPA with a kRC2 band decorder. Basically, I 
built a cable to connect the AuxBus pin on the KRC2 XCVR port t the GPIO input 
on the KX3-KXPA adapter cable, which is driven by KX3 ACC2 port. This doesn't 
seem to be working and I'm not sure the right setting is enabled for the ACC2 
port to allow for AuxBus communications. Has anyone tried this? Any help is 
appreciated



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[Elecraft] KRC2 and KX3

[Robert Vargas-KP4Y via Elecraft]

Hello,

I'm trying to interface a KX3/KXPA with a kRC2 band decorder. Basically, I 
built a cable to connect the AuxBus pin on the KRC2 XCVR port t the GPIO input 
on the KX3-KXPA adapter cable, which is driven by KX3 ACC2 port. This doesn't 
seem to be working and I'm not sure the right setting is enabled for the ACC2 
port to allow for AuxBus communications. Has anyone tried this? Any help is 
appreciated

73,
Robert-KP4Y/W4

Sent from my iPhone


Sent from my iPhone
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Re: [Elecraft] KRC2 not working after PA upgrade

[Jack Brindle]

Pin 9? The KRC2 Auxbus connection is on pin 6. Use pin 5 for the ground 
connection. If you used pin 1 for ground that should work also.

The 100 watt amplifier should have no affect on KRC2 operation, recheck your 
internal cabling to make sure everything is OK, and recheck the Aux IO cabling.
It should be:
K3 Aux IO: Pin 2 — KRC2 pin 6
K3 Aux IO: Pin 5 or 12  — KRC2 pin 5

Make sure the W jumpers are set properly. If you are connecting the K3 to the 
KRC2’s XCVR port, be sure that W16 is installed. In general you can remove Ws 
17-23. 
That is all that is needed.

Power cycling the KRC2 should have no effect on the K3. If you have changed 
W1-8, power cycling will have affect on the KRC2, however.

Give me details of your setup and I’ll work with you to get things going.

73,

Jack Brindle, W6FB
Elecraft Engineering


> On Jan 25, 2016, at 1:42 PM, Dave Glenn  wrote:
> 
> I recently had the 100 Watt amp added to my K3. 
> 
> I went to set it up with and use with my transverters and KRC2 menu item
> shows - 
> 
> Cabling looks good going from 15 pin on the K3 to the 9 on the KRC2.
> 
> 
> 
> If I power cycle the KRC2 while the K3 is on it shows Turn On PA and is
> locked up. 
> 
> 
> 
> Is there some setting I have forgotten?   
> 
> Tnx, Dave N6TEB
> 
> 
> 
> 
> 
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[Elecraft] KRC2 not working after PA upgrade

[Dave Glenn]

I recently had the 100 Watt amp added to my K3. 

I went to set it up with and use with my transverters and KRC2 menu item
shows - 

Cabling looks good going from 15 pin on the K3 to the 9 on the KRC2.

 

If I power cycle the KRC2 while the K3 is on it shows Turn On PA and is
locked up. 

 

Is there some setting I have forgotten?   

Tnx, Dave N6TEB

 

 

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Re: [Elecraft] KRC2 not working after PA upgrade

[Don Wilhelm]

Dave,

AFAIK, the addition of the KPA3 should not have any effect on the 
operation of the KRC2.


Check the jumpers in the KRC2 against the AUXBUS configuration for the 
K3 on page 23 of the KRC2 manual.
The two indications of K3 menu for the KRC2 show "-" and the "Turn On 
PA" message are making me think that there is some kind of conflict on 
the AUXBUS signal internal to the K3 or KRC2.


73,
Don W3FPR

On 1/25/2016 4:42 PM, Dave Glenn wrote:

I recently had the 100 Watt amp added to my K3.

I went to set it up with and use with my transverters and KRC2 menu item
shows -

Cabling looks good going from 15 pin on the K3 to the 9 on the KRC2.

  


If I power cycle the KRC2 while the K3 is on it shows Turn On PA and is
locked up.

  


Is there some setting I have forgotten?

Tnx, Dave N6TEB

  

  


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[Elecraft] KRC2 for the K3

[AD6XY]

Hi All

Is there any prospect of the KRC2 being updated to fully support the K3?
Ideally a new device with outputs covering all the HF bands, including the
new ones and the 6 transverter bands? I need this for a remote setup.

My old KRC2 has finally failed and no longer responds, but it never really
interfaced well with the K3 as it only supported K2 capabilities.

Mike



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Re: [Elecraft] KRC2 for the K3

[Laurent F6DEX]

Mike

If your KRC2 failed, try to reload the firmware. Sometime, mine fails and
this is only the firmware to reload. I use with a K3 with no specific
problems.

73 Laurent F6DEX



-
Laurent F6DEX
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Re: [Elecraft] KRC2 rs232 to cpu not working

[Gordon LaPoint]

All,
   I found the problem.  My serial cable had a broken wire on pin 
2.  I had used the serial cable on my KPA-500 and it was working.  Must 
have broken when I removed it from the system and used it to test the 
KRC2. Thanks for all the pointers and help! Murphy is so busy at my QTH, 
hope he leaves soon!


Thank you,
Gordon - N1MGO

On 10/25/2015 08:54 AM, Don Wilhelm wrote:

John,

Actually a standard serial cable can be connected to the KRC2 if 
jumpers W11 thru W20 are removed, no need to cut off wires in the cable.

That information *is* in the plugging configuration charts.

73,
Don W3FPR

On 10/25/2015 8:43 AM, John K9UWA wrote:


A simple statement in the KRC2 manual could have been added by Elecraft
stating. To Program your KRC2 to your K3 radio get a standard DB9 serial
cable. and CUT OFF all wires EXCEPT 2, 3 and 5. Mark the cable Program
KCR2 ONLY and save the cable for future use. I wonder how many
additional KRC2 boxes Elecraft could have sold over the  last 4 years?




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Re: [Elecraft] KRC2 rs232 to cpu not working

[Gordon LaPoint]

Jack, (and others on the list)
   Thanks for the pointers.   I was unable to get the rs-232 to the 
computer working.  I have not tried the Aux-bus to the K3 yet.   I think 
I will contact elecraft service and see if I can send it back for a 
look-see by them.  I can not tell what it has for firmware or set the 
bandmap without the rs232.
   I had only the jumpers in for the RS-232 connection, and the serial 
cable is only wired up for rx, tx and gnd (pins 2,3 and 5).  I tried all 
the baud rates, I did verify that the serial port and cable worked with 
my KPA-500 and W2 meter.


Gordon - N1MGO

On 10/22/2015 02:17 PM, Jack Brindle wrote:

Gordon;

When you get ready to test, send me an email. I will be around this weekend, 
although I plan on spending some time in CQ WW.

One thing that is very critical. Using a straight-through RS-232 cable will put 
high voltage (12V) signals on the microcontroller and can
damage it. I hope that isn’t the situation you are seeing.

The microcontroller reads the W1-8 jumpers only at power-up, so after you 
change the jumpers you must power cycle the KRC2.
You can reset the bandpass to factory default by holding the F4 button at power 
up. This requires the V1.6 firmware, which has
been out for several years. There should be a sticker on the MCU that indicates 
the firmware it held when it left the factory, but
that becomes invalid after the firmware is upgraded. At that point, the only 
real way to tell the difference is to query the MCU
with the KRC2 Utility. When you try that utility, the DL/OP switch inside the 
KRC2 needs to be on the DL position. It should be
in the OP position for normal use if you are using RS232 to communicate with 
the radio.

Let me know when you get testing and I’ll help as much as I can. We really do 
want to get you going with your KRC2 as quickly as possible.

73,

- Jack Brindle, W6FB
Elecraft Engineering



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Re: [Elecraft] KRC2 rs232 to cpu not working

[Don Wilhelm]

John,

Actually a standard serial cable can be connected to the KRC2 if jumpers 
W11 thru W20 are removed, no need to cut off wires in the cable.

That information *is* in the plugging configuration charts.

73,
Don W3FPR

On 10/25/2015 8:43 AM, John K9UWA wrote:


A simple statement in the KRC2 manual could have been added by Elecraft
stating. To Program your KRC2 to your K3 radio get a standard DB9 serial
cable. and CUT OFF all wires EXCEPT 2, 3 and 5. Mark the cable Program
KCR2 ONLY and save the cable for future use. I wonder how many
additional KRC2 boxes Elecraft could have sold over the  last 4 years?




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Re: [Elecraft] KRC2 rs232 to cpu not working

[John K9UWA]

THANKS JIM 

After 4+ years of dealing with the inability to reprogram the KRC2. Finally the 
real Answer as to how to connect the KRC2 to the Serial DB9 of your 
computer and program it with the Utility Program. Yes 4 years ago when I 
assembled the KRC2 after three very long frustrating days I managed to get 
the band map program to work and the box is programmed up for 9 HF 
bands. And I like many others now wish to reprogram it for SIX meter 
antenna. 

A simple statement in the KRC2 manual could have been added by Elecraft 
stating. To Program your KRC2 to your K3 radio get a standard DB9 serial 
cable. and CUT OFF all wires EXCEPT 2, 3 and 5. Mark the cable Program 
KCR2 ONLY and save the cable for future use. I wonder how many 
additional KRC2 boxes Elecraft could have sold over the  last 4 years? 

Again thanks Jim for the simple solution.
John k9uwa


> It is important to understand that the DB9 connectors on the KRC2 ARE 
> NOT for an RS232 connection, and, in general, will NOT WORK with 
> standard RS232 cables. It's wiring is VERY different, because the 
> product was originally designed to work with the K2 remote control, 
> which is also very different from RS232. Wiring is shown in the manual 
> (Fig 6).
> 
> On the DB9 connectors, ONLY pins 2, 3, and 5 are used for serial 
> control, and are wired to corresponding pins on a computer serial port.
> 
> I used to have two KRC2s in my station controlling sets of W3NQN 
> bandpass filters with the Array Solutions switchbox. I don't remember 
> details of the hookup, but the manual clearly shows how the KRC2 can be 
> configured for a variety of uses.
> 
> One very useful piece of information is that band data from the K2 and 
> K3 to the KRC2 is contained in the single AUX Bus circuit, which I 
> implemented with a coax cable between my K3 15-pin AUX connector and the 
> KRC2. That bus is Pin 6 on the DB9 connectors.
> 
> 73, Jim K9YC


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Re: [Elecraft] KRC2 rs232 to cpu not working

[Michael Eberle]

What is the issue with using the KRC2 on six meters?  Mine works with my 
K3 on 6 and also 2 meters by setting the 6M transceiver band to the XV1 
control output and 2M transceiver band to the XV2 control output.


Mike
KI0HA

On 10/25/2015 7:43 AM, John K9UWA wrote:

  And I like many others now wish to reprogram it for SIX meter
antenna.




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Re: [Elecraft] KRC2 rs232 to cpu not working

[Jim Brown]

On Thu,10/22/2015 5:20 PM, Bob wrote:
That may not be necessary.   I'm working from memory which is a 
horrible thing to try and use but if I recall correctly each of the 9 
pin connectors have jumpers on each pin. 


It is important to understand that the DB9 connectors on the KRC2 ARE 
NOT for an RS232 connection, and, in general, will NOT WORK with 
standard RS232 cables. It's wiring is VERY different, because the 
product was originally designed to work with the K2 remote control, 
which is also very different from RS232. Wiring is shown in the manual 
(Fig 6).


On the DB9 connectors, ONLY pins 2, 3, and 5 are used for serial 
control, and are wired to corresponding pins on a computer serial port.


I used to have two KRC2s in my station controlling sets of W3NQN 
bandpass filters with the Array Solutions switchbox. I don't remember 
details of the hookup, but the manual clearly shows how the KRC2 can be 
configured for a variety of uses.


One very useful piece of information is that band data from the K2 and 
K3 to the KRC2 is contained in the single AUX Bus circuit, which I 
implemented with a coax cable between my K3 15-pin AUX connector and the 
KRC2. That bus is Pin 6 on the DB9 connectors.


73, Jim K9YC

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Re: [Elecraft] KRC2 rs232 to cpu not working

[Byron Servies]

Hi Gordon,

I recently, and finally, got to the point where I needed to set up
band maps in my KRC2. I also use PCIe serial cards and Windows 10 and
the problem I had was the cable. Once I built a cable using exactly
the pinouts in the KRC2 manual (instead of cables I had laying
around), it worked fine, as did the firmware update.

Sorry I cannot be of more help, but that is what worked for me.

73, Byron N6NUL

On Thu, Oct 22, 2015 at 5:38 AM, Gordon LaPoint
 wrote:
> Jack, and others that have sent advice
>
> I have the latest manual from the Elecraft website.  I have only
> followed the manual as far as testing the unit from the buttons on the unit,
> which works fine, and using the rs232 to computer using the latest Elecraft
> software to try to check/set the band map.  That I have not got working yet.
> The software never finds the KRC2 on the serial port.  I tried two
> computers, one using win7 the other using win10.  Both computers have pciE
> serial cards, NOT usb to serial.   Both computers talk to my K3 and KPA500
> just fine.
> I will try to work on it again this weekend and see what else I can come up
> with.
> I have double and triple checked the jumpers for proper setup for rs232
> setup, tried changing the baud rate, using all three. the KRC2 software can
> not see the unit.  I can check the serial lines with a scope to see if the
> signals are geting to the pic chip, but that will have to wait until the
> weekend.
>   Thanks for the help,
-- 
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
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Re: [Elecraft] KRC2 rs232 to cpu not working

[Gordon LaPoint]

Byron,
 Thanks!   I will check my serial cable pinout, I think I'm using a 
straight thru with all pins connectd.  I may have to make a cable with 
just the pins connected that the manual specifies.


Gordon - N1MGO

On 10/22/2015 01:21 PM, Byron Servies wrote:

Hi Gordon,

I recently, and finally, got to the point where I needed to set up
band maps in my KRC2. I also use PCIe serial cards and Windows 10 and
the problem I had was the cable. Once I built a cable using exactly
the pinouts in the KRC2 manual (instead of cables I had laying
around), it worked fine, as did the firmware update.

Sorry I cannot be of more help, but that is what worked for me.

73, Byron N6NUL



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Re: [Elecraft] KRC2 rs232 to cpu not working

[Bob]

That may not be necessary.   I'm working from memory which is a horrible thing 
to try and use but if I recall correctly each of the 9 pin connectors have 
jumpers on each pin.   Some time ago when I had installation troubles with mine 
I determined what was actually needed in my case and removed all unnecessary 
jumpers.   Bingo!  All issues went away...   I did not try to determine what 
connections were the problem


I had a PC connected thru a USB to RS232 convertor and the K3 Aux buss on the 
other port.  Both now remain connected even when not it use.


My KRC controls an Array Solution  Six Pack..It has an added switch so can 
do fully automatic switching or manual override.


73,
Bob
K2TK   ex KN2TKR (1956) & K2TKR


On 10/22/2015 1:25 PM, Gordon LaPoint wrote:

Byron,
 Thanks!   I will check my serial cable pinout, I think I'm using a 
straight thru with all pins connectd.  I may have to make a cable with just 
the pins connected that the manual specifies.


Gordon - N1MGO

On 10/22/2015 01:21 PM, Byron Servies wrote:

Hi Gordon,

I recently, and finally, got to the point where I needed to set up
band maps in my KRC2. I also use PCIe serial cards and Windows 10 and
the problem I had was the cable. Once I built a cable using exactly
the pinouts in the KRC2 manual (instead of cables I had laying
around), it worked fine, as did the firmware update.

Sorry I cannot be of more help, but that is what worked for me.

73, Byron N6NUL





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Re: [Elecraft] KRC2 rs232 to cpu not working

[Gordon LaPoint]

Jack, and others that have sent advice

I have the latest manual from the Elecraft website.  I have only 
followed the manual as far as testing the unit from the buttons on the 
unit, which works fine, and using the rs232 to computer using the latest 
Elecraft software to try to check/set the band map.  That I have not got 
working yet.  The software never finds the KRC2 on the serial port.  I 
tried two computers, one using win7 the other using win10.  Both 
computers have pciE serial cards, NOT usb to serial.   Both computers 
talk to my K3 and KPA500 just fine.
I will try to work on it again this weekend and see what else I can come 
up with.
I have double and triple checked the jumpers for proper setup for 
rs232 setup, tried changing the baud rate, using all three. the KRC2 
software can not see the unit.  I can check the serial lines with a 
scope to see if the signals are geting to the pic chip, but that will 
have to wait until the weekend.

  Thanks for the help,

Gordon - N1MGO

On 10/21/2015 06:33 PM, Jack Brindle wrote:

Gordon;

How can I help? Please describe what you are trying to do, what has worked and 
what hasn’t.

Also, a good description of the jumpers, inserted and not, would be very 
helpful.

If you don’t have it, be sure to download the manual from the Elecraft website.

Jack Brindle, W6FB
Elecraft Engineering


On Oct 21, 2015, at 10:15 AM, Gordon LaPoint  wrote:

I purchased a used KRC2 band decoder.   Going through the tests in the manual, 
it works with the buttons on the KRC2, but I can not get the unit to 
communicate with my computer.  I downloaded the software from Elecraft, using 
Windows 7 or 10 and real serial ports (not usb-serial).  What am I doing wrong? 
or is the unit bad?  I have not hooked  up the auxbuss to the K3 yet, wanted to 
make sure the bandmap and serial port work first.

Gordon -- N1MGO

--
Gordon - N1MGO

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Re: [Elecraft] KRC2 rs232 to cpu not working

[John K9UWA]

ATTENTION: Eric

Elecraft has for several years been saying they were going to rewrite the 
horrible KRC2 Utility Program that allows programming of the KRC2. And so 
far they have failed to do so. Way back when about 4 years ago I did 
manage ONCE to get the KRC2 Utility program to work and programmed 
my KRC2. Yes today I would love to reprogram it to allow connection to a 
SIX meter antenna. However as you say the program won't work. I tried on 
Computer running XP and one running Windows7 both with direct real Serial 
Port connection to the KRC2. No Luck for me. 

Eric many of us K3 users are using the KRC2 for band decoder to antenna 
switching it sure would be nice if we could program the KRC2 easily to do 
what we want.

Thanks
John k9uwa


> I purchased a used KRC2 band decoder.   Going through the tests in the 
> manual, it works with the buttons on the KRC2, but I can not get the 
> unit to communicate with my computer.  I downloaded the software from 
> Elecraft, using Windows 7 or 10 and real serial ports (not usb-serial).  
> What am I doing wrong? or is the unit bad?  I have not hooked  up the 
> auxbuss to the K3 yet, wanted to make sure the bandmap and serial port 
> work first.
> 
> Gordon -- N1MGO


John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
k9...@arrl.net
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-637-6426

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[Elecraft] KRC2 rs232 to cpu not working

[Gordon LaPoint]

I purchased a used KRC2 band decoder.   Going through the tests in the 
manual, it works with the buttons on the KRC2, but I can not get the 
unit to communicate with my computer.  I downloaded the software from 
Elecraft, using Windows 7 or 10 and real serial ports (not usb-serial).  
What am I doing wrong? or is the unit bad?  I have not hooked  up the 
auxbuss to the K3 yet, wanted to make sure the bandmap and serial port 
work first.


Gordon -- N1MGO

--
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Re: [Elecraft] KRC2 rs232 to cpu not working

[Wes (N7WS)]

Amen.  Mine sits on the shelf.  I was going to remotely switch some antennas 
using it.  Instead, I have a KAT500 and three runs of Heliax.


Although it has an RS-232 port Elecraft recommends the Aux bus. Just what I need 
another Y-connector.


On 10/21/2015 11:04 AM, John K9UWA wrote:

ATTENTION: Eric

Elecraft has for several years been saying they were going to rewrite the
horrible KRC2 Utility Program that allows programming of the KRC2. And so
far they have failed to do so. Way back when about 4 years ago I did
manage ONCE to get the KRC2 Utility program to work and programmed
my KRC2. Yes today I would love to reprogram it to allow connection to a
SIX meter antenna. However as you say the program won't work. I tried on
Computer running XP and one running Windows7 both with direct real Serial
Port connection to the KRC2. No Luck for me.

Eric many of us K3 users are using the KRC2 for band decoder to antenna
switching it sure would be nice if we could program the KRC2 easily to do
what we want.

Thanks
John k9uwa



I purchased a used KRC2 band decoder.   Going through the tests in the
manual, it works with the buttons on the KRC2, but I can not get the
unit to communicate with my computer.  I downloaded the software from
Elecraft, using Windows 7 or 10 and real serial ports (not usb-serial).
What am I doing wrong? or is the unit bad?  I have not hooked  up the
auxbuss to the K3 yet, wanted to make sure the bandmap and serial port
work first.

Gordon -- N1MGO


John Goller, K9UWA & Jean Goller, N9PXF
Antique Radio Restorations
k9...@arrl.net
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-637-6426

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Re: [Elecraft] KRC2 rs232 to cpu not working

[Don Wilhelm]

Gordon,

Have you checked the internal jumpers to be sure it is properly plugged 
for use with the K3.
Download the newest KRC2 manual if the one you have does not include use 
with the K3 - see page 23.

You have the choice of using the AUXBUS (if you only want the band data).
If you are using the serial port, the baud rate on the K3 and the PC 
application must be limited to 19,200 or below.


73,
Don W3FPR

On 10/21/2015 1:15 PM, Gordon LaPoint wrote:
I purchased a used KRC2 band decoder.   Going through the tests in the 
manual, it works with the buttons on the KRC2, but I can not get the 
unit to communicate with my computer.  I downloaded the software from 
Elecraft, using Windows 7 or 10 and real serial ports (not 
usb-serial).  What am I doing wrong? or is the unit bad?  I have not 
hooked  up the auxbuss to the K3 yet, wanted to make sure the bandmap 
and serial port work first.





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Re: [Elecraft] KRC2 rs232 to cpu not working

[Bill Frantz]

After reading about the problems people are having getting their 
PCs to talk to the KRC2, I think I'm glad I rolled my own with 
an Arduino and the band lines from the K3. I learned a lot about 
hardware, and had a fun construction project. Now antenna switch 
controller sits next to the K3 and automatically selects an 
antenna for each band. Too bad the encoding for the 60M band 
aliases the transverter bands. I may have to teach the Arduino 
async ASCII should the aliasing become a problem, or if I 
develop a need to know where in a band the K3 is tuned.


73 Bill AE6JV

---
Bill Frantz| Concurrency is hard. 12 out  | Periwinkle
(408)356-8506  | 10 programmers get it wrong. | 16345 
Englewood Ave
www.pwpconsult.com |- Jeff Frantz | Los Gatos, 
CA 95032


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Re: [Elecraft] KRC2 rs232 to cpu not working

[Vic Rosenthal]

I got mine to work several years ago on Win 7. As I recall, I had to update 
both the firmware in the KRC2 and the utility program. It was tricky. I agree 
that Elecraft needs to clean up this situation.

Vic 4X6GP/K2VCO 

> On 21 Oct 2015, at 9:04 PM, John K9UWA  wrote:
> 
> ATTENTION: Eric
> 
> Elecraft has for several years been saying they were going to rewrite the 
> horrible KRC2 Utility Program that allows programming of the KRC2. And so 
> far they have failed to do so. Way back when about 4 years ago I did 
> manage ONCE to get the KRC2 Utility program to work and programmed 
> my KRC2. Yes today I would love to reprogram it to allow connection to a 
> SIX meter antenna. However as you say the program won't work. I tried on 
> Computer running XP and one running Windows7 both with direct real Serial 
> Port connection to the KRC2. No Luck for me. 
> 
> Eric many of us K3 users are using the KRC2 for band decoder to antenna 
> switching it sure would be nice if we could program the KRC2 easily to do 
> what we want.
> 
> Thanks
> John k9uwa
> 
> 
>> I purchased a used KRC2 band decoder.   Going through the tests in the 
>> manual, it works with the buttons on the KRC2, but I can not get the 
>> unit to communicate with my computer.  I downloaded the software from 
>> Elecraft, using Windows 7 or 10 and real serial ports (not usb-serial).  
>> What am I doing wrong? or is the unit bad?  I have not hooked  up the 
>> auxbuss to the K3 yet, wanted to make sure the bandmap and serial port 
>> work first.
>> 
>> Gordon -- N1MGO
> 
> 
> John Goller, K9UWA & Jean Goller, N9PXF 
> Antique Radio Restorations
> k9...@arrl.net
> Visit our Web Site at:
> http://www.JohnJeanAntiqueRadio.com
> 4836 Ranch Road
> Leo, IN 46765
> USA
> 1-260-637-6426
> 
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Re: [Elecraft] KRC2 rs232 to cpu not working

[Michael Eberle]

A lot of people seem to be having issues with it.  I remember mine being 
a pain to get set up (mostly operator error) but it works fine now.  I 
use it to switch amp keying from the KPA500 to the 2M amp when the 2M 
band is selected on the K3.  When 2M is selected, the KRC2 energizes a 
relay that switches the key out of the K3 to the 2M amp.  You do have to 
change the switch on the side from OP to DL before it will communicate 
with the computer.  Also I believe you have to set the baud rate on the 
KRC2 with jumpers.


Mike
KI0HA

I purchased a used KRC2 band decoder. Going through the tests in the 
manual, it works with the buttons on the KRC2, but I can not get the 
unit to communicate with my computer.  I downloaded the software from 
Elecraft, using Windows 7 or 10 and real serial ports (not 
usb-serial).  What am I doing wrong? or is the unit bad?  I have not 
hooked  up the auxbuss to the K3 yet, wanted to make sure the bandmap 
and serial port work first.





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Re: [Elecraft] KRC2 relay control

[Jack Brindle]

Byron is on the right track here. The best way to control the KRC2’s ACx pins 
is to do it through the K3’s menu. The KRC2 is listening to the K3 to get band 
and status information, and not necessarily to a computer. So setting the state 
in the K3 will cause it to be changed in the KRC2.

Take a good look at the K3’s MN command, specifically MN049. I suspect that 
testing with the K3 Utility’s command pane will quickly show you the correct 
command to do what you want. From there is is a pretty simple matter to plug 
the command into N1MM+.

By the way, the K3S/K3//KX3 Programmer’s Reference has been seeing a lot of 
update activity recently. If you haven’t downloaded the latest, you may be 
missing out on some interesting stuff. 

Jack Brindle, W6FB



 On Jul 4, 2015, at 11:57 AM, Byron Servies by...@n6nul.org wrote:
 
 Hi,
 
 See the KRC2 manual and search for AC1.  On Page 15 of the rev.C
 manual, the KRC2 test procedure includes using F4 for accessory
 drivers, and page 19 has the default behavior of F4.
 
 I am not in front of my ham pc right now, but I believe there is a way
 to trigger those from the utility. Perhaps someone else knows if there
 is a command in the K2 programmers manual for triggering these
 outputs.
 
 73, Byron N6NUL
 
 On Sat, Jul 4, 2015 at 10:24 AM, Rich rwnewbo...@comcast.net 
 mailto:rwnewbo...@comcast.net wrote:
 I have research this idea on my own and do not see a way to do what I want.
 I know there are really smart folks on this list so I am looking for some
 help.
 
 I was hoping to control the 12vdc (ON/OFF) for my RX ant preamp via the K3
 keyboard commands (Writelog, N1MM).  I was thinking this could possibly be
 done via the sink/source relays in the KRC2.   I already use the KRC2 for
 band decoding,  but it appears to me that the relays only react to band
 changes.  Are there  computer controllable commands for the A B C D relays
 in the KRC2 or any other ideas?
 
 I hope this is clearer than mud.
 
 Rich
 K3RWN
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Re: [Elecraft] KRC2 relay control

[Jack Brindle]

A bit more on this. Sending MN049; to the K3 puts the K3 into the Menu mode 
with the KRC2 item selected. The VFOA display will show the status of the KRC2 
ACC pins, read directly from the KRC2. You can then issue UP; or DN; commands 
to change the KRC2 ACx pin setting. It will advance (or decrement) by one for 
each UP (or DN) issued, rolling over when it gets to the end of the sequence. 
You can read the LCD with the DS; command to tell what the AC state is. Issuing 
MN255; will get you back to normal operations.

Be sure to refer to the K3S/K3/KX3 Programmer’s Reference to get the details as 
to how to issues these commands, they can be a bit convoluted, especially when 
playing in the menus.

If you are adding the commands to N1MM, you probably want to use 2, the first 
to turn on ACC1: MN049;UP;MN255;
the second to turn it off: MN049:DN;MN255;

This can be a lot more involved if you use the AC2 or AC3 pins as well, and 
using the KRC2 with AC binary coding (jumper W4 installed) makes things far 
more complex.

Note that external control of the ACx pins requires use of the AUX I/O 
connection to the K3/K3S. The KRC2 does not have any commands to change the ACx 
pins using the serial port, nor does the transceiver have the ability to make 
that request using the serial port instead of Aux I/O.

- Jack Brindle, W6FB


 On Jul 5, 2015, at 10:47 AM, Jack Brindle jackbrin...@me.com wrote:
 
 Byron is on the right track here. The best way to control the KRC2’s ACx pins 
 is to do it through the K3’s menu. The KRC2 is listening to the K3 to get 
 band and status information, and not necessarily to a computer. So setting 
 the state in the K3 will cause it to be changed in the KRC2.
 
 Take a good look at the K3’s MN command, specifically MN049. I suspect that 
 testing with the K3 Utility’s command pane will quickly show you the correct 
 command to do what you want. From there is is a pretty simple matter to plug 
 the command into N1MM+.
 
 By the way, the K3S/K3//KX3 Programmer’s Reference has been seeing a lot of 
 update activity recently. If you haven’t downloaded the latest, you may be 
 missing out on some interesting stuff. 
 
 Jack Brindle, W6FB
 
 
 
 On Jul 4, 2015, at 11:57 AM, Byron Servies by...@n6nul.org wrote:
 
 Hi,
 
 See the KRC2 manual and search for AC1.  On Page 15 of the rev.C
 manual, the KRC2 test procedure includes using F4 for accessory
 drivers, and page 19 has the default behavior of F4.
 
 I am not in front of my ham pc right now, but I believe there is a way
 to trigger those from the utility. Perhaps someone else knows if there
 is a command in the K2 programmers manual for triggering these
 outputs.
 
 73, Byron N6NUL
 
 On Sat, Jul 4, 2015 at 10:24 AM, Rich rwnewbo...@comcast.net 
 mailto:rwnewbo...@comcast.net wrote:
 I have research this idea on my own and do not see a way to do what I want.
 I know there are really smart folks on this list so I am looking for some
 help.
 
 I was hoping to control the 12vdc (ON/OFF) for my RX ant preamp via the K3
 keyboard commands (Writelog, N1MM).  I was thinking this could possibly be
 done via the sink/source relays in the KRC2.   I already use the KRC2 for
 band decoding,  but it appears to me that the relays only react to band
 changes.  Are there  computer controllable commands for the A B C D relays
 in the KRC2 or any other ideas?
 
 I hope this is clearer than mud.
 
 Rich
 K3RWN
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 - www.cqp.org http://www.cqp.org/
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Re: [Elecraft] KRC2 relay control

[Byron Servies]

Hi,

See the KRC2 manual and search for AC1.  On Page 15 of the rev.C
manual, the KRC2 test procedure includes using F4 for accessory
drivers, and page 19 has the default behavior of F4.

I am not in front of my ham pc right now, but I believe there is a way
to trigger those from the utility. Perhaps someone else knows if there
is a command in the K2 programmers manual for triggering these
outputs.

73, Byron N6NUL

On Sat, Jul 4, 2015 at 10:24 AM, Rich rwnewbo...@comcast.net wrote:
 I have research this idea on my own and do not see a way to do what I want.
 I know there are really smart folks on this list so I am looking for some
 help.

 I was hoping to control the 12vdc (ON/OFF) for my RX ant preamp via the K3
 keyboard commands (Writelog, N1MM).  I was thinking this could possibly be
 done via the sink/source relays in the KRC2.   I already use the KRC2 for
 band decoding,  but it appears to me that the relays only react to band
 changes.  Are there  computer controllable commands for the A B C D relays
 in the KRC2 or any other ideas?

 I hope this is clearer than mud.

 Rich
 K3RWN
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- CU in the Cal QSO Party 3-4 Oct 2015
- www.cqp.org
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[Elecraft] KRC2 relay control

[Rich]

I have research this idea on my own and do not see a way to do what I 
want.  I know there are really smart folks on this list so I am looking 
for some help.


I was hoping to control the 12vdc (ON/OFF) for my RX ant preamp via the 
K3 keyboard commands (Writelog, N1MM).  I was thinking this could 
possibly be done via the sink/source relays in the KRC2.   I already use 
the KRC2 for band decoding,  but it appears to me that the relays only 
react to band changes.  Are there  computer controllable commands for 
the A B C D relays in the KRC2 or any other ideas?


I hope this is clearer than mud.

Rich
K3RWN
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[Elecraft] KRC2

[Mike Reublin NF4L]

My Ameritron RCS-12 automagic antenna switch is sulking, and not switching the 
remote RCS-10.

I'm thinking of replacing it with a KRC2 pre-built. Is anyone using it with a 
K3 and the Ameritron remote box? How difficult to configure it to work from the 
K3 ACC with the RCS-10?

The manual has the line The ACC menu entry can be used to directly control the 
KRC2's accessory outputs.. I don't find any other reference. Whatsit mean?
 
73, Mike NF4L


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Re: [Elecraft] KRC2

[Jack Brindle]

Mike, just how are you wanting to control the switch? If it is band-based, then 
just wire up the RCS-10 to the appropriate terminals in the KRC2, connect the 
KRC2 to the K3, and thing should start working. Are your needs more than this?

The best way to use the KRC2 with the K3 is using the Auxbus connection. Just 
two wires, Auxbus and ground, from the KRC2 to the K3. The KRC2 needs power, of 
course, and then the connections to the relay box.

Now, as for the ACC connectors, the K3 has entries in the KRC2 menu for 
Accessory switching. They directly control the ACC pins based on your menu 
selection.what can this be used for? Perhaps alternate antennas for a band, or 
other things.

It really is pretty simple. The large majority of users don’t even need to use 
the KRC2 utility to remap the output pins. Just hook things up and operate.

73!

- Jack B, W6FB

 On Jun 11, 2015, at 10:41 AM, Mike Reublin NF4L n...@comcast.net wrote:
 
 My Ameritron RCS-12 automagic antenna switch is sulking, and not switching 
 the remote RCS-10.
 
 I'm thinking of replacing it with a KRC2 pre-built. Is anyone using it with a 
 K3 and the Ameritron remote box? How difficult to configure it to work from 
 the K3 ACC with the RCS-10?
 
 The manual has the line The ACC menu entry can be used to directly control 
 the KRC2's accessory outputs.. I don't find any other reference. Whatsit 
 mean?
 
 73, Mike NF4L
 
 
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Re: [Elecraft] KRC2

[Mike Reublin NF4L]

Thanks, Jack, sounds doable. Still dunno about this part the K3 has entries in 
the KRC2 menu for Accessory switching.

73, Mike NF4L


 On Jun 11, 2015, at 2:30 PM, Jack Brindle jackbrin...@me.com wrote:
 
 Mike, just how are you wanting to control the switch? If it is band-based, 
 then just wire up the RCS-10 to the appropriate terminals in the KRC2, 
 connect the KRC2 to the K3, and thing should start working. Are your needs 
 more than this?
 
 The best way to use the KRC2 with the K3 is using the Auxbus connection. Just 
 two wires, Auxbus and ground, from the KRC2 to the K3. The KRC2 needs power, 
 of course, and then the connections to the relay box.
 
 Now, as for the ACC connectors, the K3 has entries in the KRC2 menu for 
 Accessory switching. They directly control the ACC pins based on your menu 
 selection.what can this be used for? Perhaps alternate antennas for a band, 
 or other things.
 
 It really is pretty simple. The large majority of users don’t even need to 
 use the KRC2 utility to remap the output pins. Just hook things up and 
 operate.
 
 73!
 
 - Jack B, W6FB
 
 On Jun 11, 2015, at 10:41 AM, Mike Reublin NF4L n...@comcast.net 
 mailto:n...@comcast.net wrote:
 
 My Ameritron RCS-12 automagic antenna switch is sulking, and not switching 
 the remote RCS-10.
 
 I'm thinking of replacing it with a KRC2 pre-built. Is anyone using it with 
 a K3 and the Ameritron remote box? How difficult to configure it to work 
 from the K3 ACC with the RCS-10?
 
 The manual has the line The ACC menu entry can be used to directly control 
 the KRC2's accessory outputs.. I don't find any other reference. Whatsit 
 mean?
 
 73, Mike NF4L
 
 
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Re: [Elecraft] KRC2

[Don Wilhelm]

Mike,

Refer to the K3 manual page 57 - menu entry for KRC2, and also the KRC2 
manual.
There is a bit of possible confusion between the two designations 
ACC.  A standard KRC2 has 3 ACC outputs as well as the band outputs.
The KRC2ACC is a slightly different version of the KRC2 which has 
features intended to assist unsighted amateurs - and the buttons in that 
version serve a different purpose than for the standard version.
If you happen to have the KRC2ACC hardware, you can negate the changes 
for the announciator functions by loading the non-ACC version of the 
KRC2 firmware and it will function as the standard one.


73,
Don W3FPR

On 6/11/2015 3:03 PM, Mike Reublin NF4L wrote:

Thanks, Jack, sounds doable. Still dunno about this part the K3 has entries in the 
KRC2 menu for Accessory switching.

73, Mike NF4L




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Re: [Elecraft] KRC2

[Mike Reublin NF4L]

AHA! Thanks Don. Having found it I'll have to figure out how to use it. 
73, Mike NF4L


 On Jun 11, 2015, at 3:30 PM, Don Wilhelm w3...@embarqmail.com wrote:
 
 Mike,
 
 Refer to the K3 manual page 57 - menu entry for KRC2, and also the KRC2 
 manual.
 There is a bit of possible confusion between the two designations ACC.  A 
 standard KRC2 has 3 ACC outputs as well as the band outputs.
 The KRC2ACC is a slightly different version of the KRC2 which has features 
 intended to assist unsighted amateurs - and the buttons in that version serve 
 a different purpose than for the standard version.
 If you happen to have the KRC2ACC hardware, you can negate the changes for 
 the announciator functions by loading the non-ACC version of the KRC2 
 firmware and it will function as the standard one.
 
 73,
 Don W3FPR
 
 On 6/11/2015 3:03 PM, Mike Reublin NF4L wrote:
 Thanks, Jack, sounds doable. Still dunno about this part the K3 has entries 
 in the KRC2 menu for Accessory switching.
 
 73, Mike NF4L
 
 
 

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[Elecraft] KRC2 for Sale

[Rich]

I have a KRC2 (currently setup for Icom) for sale.

Contact me off list.

k3...@arrl.net

Rich
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Re: [Elecraft] KRC2 wanted

[Michael Walker]

I have one.

Mike va3mw


On Thu, Jan 1, 2015 at 1:00 PM, Cady, Fred fc...@ece.montana.edu wrote:

 I'm looking for a KRC2 if anybody has one they want to get rid of.
 Cheers and HNY,
 Fred KE7X

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[Elecraft] KRC2 wanted

[Cady, Fred]

I'm looking for a KRC2 if anybody has one they want to get rid of.
Cheers and HNY,
Fred KE7X

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[Elecraft] krc2 flashing LED

[Joe Hetrick]

Something happened to my KRC2 between yesterday and today.

Power-up this morning, LED flashes.  I tried to fire it up ith the 2.1.7 Config 
Util; whatever state the LED is in, on or off, persists if I check for the KRC2 
( but one is never found )-- eg if the LED happens to be blinking ON, kit stays 
on as soon as the query starts; if it's off, it stays off.

Any ideas?

73,

Joe KC0VKN


-- 
Joe Hetrick
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BOFH Excuse: Your cat tried to eat the mouse.
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Re: [Elecraft] krc2 flashing LED

[Joe Hetrick]

Too much rum and eggnog for me; I forgot there was a separate dl utilty for the 
KRC2..it's been a couple years since I last updated it!

Thanks for the reminder :).. it now seems fine.


73, KC0VKN 

On 29 Dec 14:12, Rich wrote:
 I have seen this on my KRC2 and the only way I have been able to fix

 it is to reload the firmware.   I am not sure what causes the
 problem, however I have two of these units.  One of them has never
 had this problem while the other one acts up every couple months.
 
 Rich
 On 12/29/2014 1:02 PM, Joe Hetrick wrote:
 Something happened to my KRC2 between yesterday and today.
 
 Power-up this morning, LED flashes.  I tried to fire it up ith the 2.1.7 
 Config Util; whatever state the LED is in, on or off, persists if I check 
 for the KRC2 ( but one is never found )-- eg if the LED happens to be 
 blinking ON, kit stays on as soon as the query starts; if it's off, it stays 
 off.
 
 Any ideas?
 
 73,
 
 Joe KC0VKN
 
 

-- 
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[Elecraft] KRC2 and TS480

[Steve Bunting]

Hi everyone,


I have KRC2 band decoder that I used ages ago with my K2 - it still works
in that I can toggle bands when I hold the F1 button. I want to use it with
my remote TS-480 but the radio CAT isn't currently driving KRC2 at all and
I would like some advice on how to get it working, please.


Current set up: I have used the Kenwood jumper positions from the KRC2
manual and have a straight through serial cable from rig to KRC2. I am
using 4800 baud (W7 and W8 in place) and the radio CAT works with my PC.
The KRC2 is certainly in operate mode and I have a 13.8V PSU attached
(stating the obvious!)


Questions: I suspect I need to apply the handshake jumper between W14 and
W17 for the TS-480? Does the position of W7 and W8 matter for 4800 baud?
I'm assuming the manual is correct. Can any 480/KRC2 users comment on
anything else I have missed?



73

Steve

M0BPQ
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Re: [Elecraft] KRC2 and TS480

[Robert Bajuk]

Hi Steve,

I have KRC2 which works without issue with my remote TS-480.

I had conversation with Gary from Elecraft some time ago and his setup
proposal works OK for me.

Jumper settings inside KRC2:
---
Jumpers IN: 3, 6, 9, 10, and 21-23
Jumpers 14  17 bridged with voltage from pin 7 of U2 fed to this jumper
(~2 piece of wire).

Jumpers W7 and W8 depend of data rate, see KRC2 manual page 20

Hope it helps

73 Robert, S57AW




2014-04-08 12:52 GMT+02:00 Steve Bunting stephen.bunt...@virgin.net:

 Hi everyone,


 I have KRC2 band decoder that I used ages ago with my K2 - it still works
 in that I can toggle bands when I hold the F1 button. I want to use it with
 my remote TS-480 but the radio CAT isn't currently driving KRC2 at all and
 I would like some advice on how to get it working, please.


 Current set up: I have used the Kenwood jumper positions from the KRC2
 manual and have a straight through serial cable from rig to KRC2. I am
 using 4800 baud (W7 and W8 in place) and the radio CAT works with my PC.
 The KRC2 is certainly in operate mode and I have a 13.8V PSU attached
 (stating the obvious!)


 Questions: I suspect I need to apply the handshake jumper between W14 and
 W17 for the TS-480? Does the position of W7 and W8 matter for 4800 baud?
 I'm assuming the manual is correct. Can any 480/KRC2 users comment on
 anything else I have missed?



 73

 Steve

 M0BPQ
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Re: [Elecraft] KRC2 and TS480

[Don Wilhelm]

Steve,

You will have to refer to your TS-4800 documentation to determine the 
data rate (setting for W7 and W8 jumpers) and the proper setting for the 
handshake jumpers W14 and W17.
I do not have a TS-4800, but the manual should tell you what is needed 
and then the KRC2 manual will tell you how to plug it.


73,
Don W3FPR

On 4/8/2014 6:52 AM, Steve Bunting wrote:

Hi everyone,


I have KRC2 band decoder that I used ages ago with my K2 - it still works
in that I can toggle bands when I hold the F1 button. I want to use it with
my remote TS-480 but the radio CAT isn't currently driving KRC2 at all and
I would like some advice on how to get it working, please.


Current set up: I have used the Kenwood jumper positions from the KRC2
manual and have a straight through serial cable from rig to KRC2. I am
using 4800 baud (W7 and W8 in place) and the radio CAT works with my PC.
The KRC2 is certainly in operate mode and I have a 13.8V PSU attached
(stating the obvious!)


Questions: I suspect I need to apply the handshake jumper between W14 and
W17 for the TS-480? Does the position of W7 and W8 matter for 4800 baud?
I'm assuming the manual is correct. Can any 480/KRC2 users comment on
anything else I have missed?




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Re: [Elecraft] KRC2 and TS480

[Steve Bunting]

And for the list record, I can report that the mods reported to the group
by Robert, S57AW, work a treat. My TS-480 now talks seamlessly with the
KRC2. Thanks again Robert!

73
Steve
M0BPQ


On 8 April 2014 11:52, Steve Bunting stephen.bunt...@virgin.net wrote:

 Hi everyone,


 I have KRC2 band decoder that I used ages ago with my K2 - it still works
 in that I can toggle bands when I hold the F1 button. I want to use it with
 my remote TS-480 but the radio CAT isn't currently driving KRC2 at all and
 I would like some advice on how to get it working, please.


 Current set up: I have used the Kenwood jumper positions from the KRC2
 manual and have a straight through serial cable from rig to KRC2. I am
 using 4800 baud (W7 and W8 in place) and the radio CAT works with my PC.
 The KRC2 is certainly in operate mode and I have a 13.8V PSU attached
 (stating the obvious!)


 Questions: I suspect I need to apply the handshake jumper between W14 and
 W17 for the TS-480? Does the position of W7 and W8 matter for 4800 baud?
 I'm assuming the manual is correct. Can any 480/KRC2 users comment on
 anything else I have missed?



 73

 Steve

 M0BPQ

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[Elecraft] FS / Trade -- Elecraft KRC2 Band Decoder / Antenna Relay 8 Port Remote Coax Switch

[Andy Vavra]

I am offering for sale or trade an assembled Elecraft KRC2 Band Decoder /
Antenna Relay Driver and homebrew 8-port remote coaxial switch that are
surplus to my needs.

 

Neither the KRC2 nor the relay box have ever been used or mounted outside in
the weather.

 

The KRC2 Band Decoder is a universal, programmable station control unit that
can switch any combination of antennas, filters, amplifiers, or other
equipment. It supports analog, digital, and RS232 control inputs, so it's
compatible with transceivers from Icom (voltage level), Yaesu (BCD and
voltage level), and Kenwood (serial or BCD via logging program), as well as
Elecraft's K3, K2 and K2/100 rigs.

 

More details on the KRC2 can be found at this link on the Elecraft website
at this link: http://www.elecraft.com/KRC2/krc2.htm 

 

The 8-port switch is built in a gasketed waterproof box and is set-up so
that both the shield and center conductor of any given antenna are switched
at the same time with DPDT relays to fully disconnect  unused antennas from
the system.  Teflon connectors and heavy duty relays are used to withstand
full QRO power levels.

 

Actual photos of both units can be viewed here:
http://s993.photobucket.com/user/andyvavra/library/KRC2 

 

Asking $125 (or best offer) + postage, or will trade for a  KBPF3  General
Coverage RX Bandpass Module

 

Please contact me off-list at KD3RF at ARRL dot NET

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[Elecraft] SOLD -- Elecraft KRC2 Band Decoder / Antenna Relay 8 Port Remote Coax Switch

[Andy Vavra]

KRC2 and Coax Switch have been sold and are no longer available.

 

Thanks to all who replied.

 

n  Andy, KD3RF

 

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Re: [Elecraft] KRC2 for sale K3 or K2

[Pfizenmayer]

Kit was $159.95 -  Sell for $110 USPS MO including shipping by USPS priority 
mail - or $100 cash local pickup.


No charge for my installing 60 capacitors , 9 diodes , 13 resistors and 
couple dozen other things . Manual and 12 volt supply line included.  I am 
using the supplied DB15 male connector on the K3

.
Kit  bought 6/2013 -  built 7/2013 -  works fine with K3 - has suggested 
Elecraft mods ( DB9 connector tabs soldered to board  and internal paint 
removed around all case grounds.)


Works perfectly but I had problems trying to switch between it and RATPAK 
manual operation  to be able to also use manual antenna switching with my 
RATPAK so built one using the K3 BCD data and W9XT boards which were much 
easier to disable.


Hank K7HP

pfizenmayer  (at Q.com)

info OK in QRZ.com 


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Re: [Elecraft] KRC2 /K3

[AD6XY]

Hello Hank

I sympathize with these difficult issues - the KRC2 is out of date and its
about time it was replaced but at least it has always been reliable. I have
one and it has never suffered from RF getting into it. Sorry if the below is
stating what is already obvious to you.

This may be a symptom of an RF in the shack problem. The 1ft line should not
be a problem and as long as it is screened additional filtering should not
help. Using RS232 may cure the symptoms but not the cause and your own BCD
interface likewise.

If it is an RF getting into the system problem,  how might that be
happening? A good way to check if it really is RF in the shack is to ask
yourself if you have issues with lots of noise on the bands from the shack
computer. As antennas are reciprocal, if you have significant coupling of RF
back you will also have coupling of noise in. 

Obviously with 1500W the antennas will have to be a long way away from the
operating position (for safety if nothing else) so we can probably rule out
this being due to direct radiation from the antenna.  I assume you have
remote antennas and the array solution switch somewhere remote with a long
feeder back to the shack. Maybe at the base of a tower.

Could RF be getting back on the control lines from the remote switch? Are
the control lines screened? Are they running close to the feeder. Putting
ferrite on the switch control lines may help. Ditto the feeder. Burying the
feeder helps a lot but isn't always practical. 

One of the worst configurations for this problem is a feeder on a catenary
because it will pick up like an antenna, especially if you have an effective
RF choke at the antenna end. If you have that arrangement, ferrites are the
answer - plus a good short connection to your RF ground where the cable
enters the house.

The other possibility is you are using several feeders via the switch with
an ATU in the shack. That's a problem because you will potentially have a
bad match on the feeder in use, almost certainly a bad match on the feeders
not in use which will result in the pickup from all the feeders merging at
the switch. So, if the remote switch is actually in the shack I would
investigate if you can improve the grounding and maybe move it somewhere
else - like right next to the ground stake.

Mike











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Re: [Elecraft] KRC2 /K3

[Jim Brown]

On 9/5/2013 1:09 PM, Pfizenmayer wrote:

OR -   is it worth changing to the RS232 bus and using the BCD data from  the 
K3 ?  Looking at the KRC2 schematic , it looks like the microprocessor is still 
in the act with the RS232 inputs going thru it . But I have filtered  RS232 
data lines with   Ferroxcube VK400 2 1/2 turn hi mu ferrite chokes and 0.001's 
at least on PTT and KEY  lines with no problems.


I inherited a pair of KRC2s from N6RNO as part of the bandpass filter 
kit for our CQP multi-op setup. As built, they are FULL of Pin One 
Problems, and they are completely unshielded (thanks to paint between 
the chassis and things that are intended to contact it, and paint 
between sections of the enclosure that should make contact but do not). 
It took me an hour or two on each unit to clean up the mess.


Most RF in the shack is the result of Pin One Problems.  If your 
antennas are close to your shack, they will put RF in your shack, but 
our equipment SHOULD be designed to reject it. Pin One Problems are an 
open door into equipment for hum, buzz, and RFI.


Lots of detailed stuff about Pin One Problems on my website. 
http://k9yc.com/RFI-Ham.pdf and http://k9yc.com/publish.htm


One very useful piece of information is that all that is required to get 
band data from a K3 to a KRC2 is a single run of coax to connect the AUX 
BUS.  Pin One Problems can be avoided by connecting the coax shield at 
both ends to the SHELL of the DB-connectors. BUT -- in the KRC2, the 
shells of the DB-connectors are insulated from the chassis, so that's 
one of the messes that you must clean up.


Both the K3 and KRC2 are designed to be universal in their AUX 
interfaces, so they provide BCD data on other pins in the DB15 for use 
with other radios and other interface equipment.


Another idea Hank -- if you're using an RS232 interface, see my notes 
about using CAT5 cable to build your own RS232 cable. Twisted pair 
provides strong rejection of hum, buzz, and  RFI.  Use one pair for each 
signalling circuit, with the solid color going to the high side pins (2, 
3, 4, 7) and the striped conductors twisted together and connected to 
the DB9 shell.


73, Jim K9YC
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[Elecraft] KRC2 /K3

[Pfizenmayer]

I have a KRC2 that is presently using the AUX Bus input to  drive an Array 
Solutions remote antenna switch .  At 100 watts , it is usable but at 1500 
watts is unusable. This evening I even unplugged the 12vdc supply and it still 
drove the K3 nuts - froze it once and several times it would show KPA500 (dunno 
where that comes from , I don't have one ).ONly thing that kills it is to 
unhook the AUX Bus line. I am not real wild about it changing antennas randomly 
-- even with two SWR triggers in use. 

I won't bore you with the ferrite cores etc I have tried and or still have in 
place.and other details -  - my questions are  

Anybody have any experience with how much RF filtering I could insert in the 1 
foot K3/KRC2 aux bus cable ? 

OR -   is it worth changing to the RS232 bus and using the BCD data from  the 
K3 ?  Looking at the KRC2 schematic , it looks like the microprocessor is still 
in the act with the RS232 inputs going thru it . But I have filtered  RS232 
data lines with   Ferroxcube VK400 2 1/2 turn hi mu ferrite chokes and 0.001's 
at least on PTT and KEY  lines with no problems. 

I am tempted to sell the KRC2 and build my own BCD  RS232  to serial  
converter, just thought the KRC2 would be a quicker solution. Its overkill for 
what I need  to do. 

Hank K7HP 

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Re: [Elecraft] KRC2/K3

[Don Wilhelm]

If you are only using the High side switching from the KRC2, removing D4 
will work fine for you.  The low side switching will continue to function.


73,
Don W3FPR

On 8/11/2013 11:57 PM, Pfizenmayer wrote:

I have a KRC2 using the AUX bus which works OK , switching the RATPAK 5 6 
remote box and showing the LED indicators of the RATPAK switch box.


I would like to be able to turn off the KRC2 to allow manual switching of the 
antennas - I am feeding 12vdc to the SOURCE driver terminal strip J5 in the 
KRC2 and if I turn off that supply , there is a  diode D4 that feeds 12 vdc 
from the normal DC input jack on the KRC2 to the SOURCE driver Vbb so even if I 
turn the other 12v supply off , it stays latched on the last band .

If I remove the 12 vdc feeding the microprocessor , but leave the AUX BUSS on 
ACC connected , the K3 freezes and will not reboot .If I remove the conection 
between the KRC2 and the ACC connector , then it will reboot and is normal.

Is this normal AUX bus behaviour ? If so looks like I will either clip D4 - or 
ressurect my relay switch box to completely isolate the 7 wires from either 
KRC2 or the RATPAK manual switch to the remote switch box.



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[Elecraft] KRC2/K3

[Pfizenmayer]

I have a KRC2 using the AUX bus which works OK , switching the RATPAK 5 6 
remote box and showing the LED indicators of the RATPAK switch box.


I would like to be able to turn off the KRC2 to allow manual switching of the 
antennas - I am feeding 12vdc to the SOURCE driver terminal strip J5 in the 
KRC2 and if I turn off that supply , there is a  diode D4 that feeds 12 vdc 
from the normal DC input jack on the KRC2 to the SOURCE driver Vbb so even if I 
turn the other 12v supply off , it stays latched on the last band . 

If I remove the 12 vdc feeding the microprocessor , but leave the AUX BUSS on 
ACC connected , the K3 freezes and will not reboot .If I remove the conection 
between the KRC2 and the ACC connector , then it will reboot and is normal. 

Is this normal AUX bus behaviour ? If so looks like I will either clip D4 - or 
ressurect my relay switch box to completely isolate the 7 wires from either 
KRC2 or the RATPAK manual switch to the remote switch box. 

Hank K7HP 
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Re: [Elecraft] KRC2/K3

[iain macdonnell - N6ML]

Hi Hank,

The problem of the K3 locking up when power is removed from the KRC2
started around the time KPA500 support was added to the K3 firmware.
It's normal in that it's not just you, if that helps any...

73,

~iain / N6ML


On Sun, Aug 11, 2013 at 8:57 PM, Pfizenmayer pfizenma...@q.com wrote:
 I have a KRC2 using the AUX bus which works OK , switching the RATPAK 5 6 
 remote box and showing the LED indicators of the RATPAK switch box.


 I would like to be able to turn off the KRC2 to allow manual switching of the 
 antennas - I am feeding 12vdc to the SOURCE driver terminal strip J5 in the 
 KRC2 and if I turn off that supply , there is a  diode D4 that feeds 12 vdc 
 from the normal DC input jack on the KRC2 to the SOURCE driver Vbb so even if 
 I turn the other 12v supply off , it stays latched on the last band .

 If I remove the 12 vdc feeding the microprocessor , but leave the AUX BUSS on 
 ACC connected , the K3 freezes and will not reboot .If I remove the conection 
 between the KRC2 and the ACC connector , then it will reboot and is normal.

 Is this normal AUX bus behaviour ? If so looks like I will either clip D4 - 
 or ressurect my relay switch box to completely isolate the 7 wires from 
 either KRC2 or the RATPAK manual switch to the remote switch box.

 Hank K7HP
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