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K2 and Digi Modes

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Rudi-2

K2 and Digi Modes

Hello FM,

I would like to do some digi modes with my K2.

I don't like external interface and would like to install something inside
the K2.

I saw on internet a board from en EA station, but it seems that this is not
availiable anymore.

All info is welcome.

Best 73 - Rudi - ON7CL / KB8TAB
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Don Wilhelm-4

Re: K2 and Digi Modes

Rudi,

Take a look at the W3FPR Fixed Audio Output that can be found on Tom
Hammond's website www.n0ss.net.
Unfortunately, Tom no longer offers the boards but has offered to
provide the PC board data to anyone who wants it. You could easily wire
the circuit on a piece of perfboard. That takes care of the output
(without isolation transformers), but you are on your own for the input
side. If you have no need for switching between digital input and a
microphone, there is nothing wrong with putting a resistive attenuator
on the Mic AF line inside the K2 - you can easily break the line at the
microphone configuration header and add a couple resistors at that point.

If you use RTS or DTR from the serial port for PTT, you will certainly
have to place the one transistor interface (or optoisolator) for that
outside the K2. I guess one could butcher the KIO2 or AUX I/O internal
K2 signal lines on the KPA100, but that would make it unusable fo
connecting an external Elecraft device like the KAT100, the XV series
transverters or the KRC2, and I would not recommend doing that.

Any isolation transformers may have to live outside the K2 if it is a
K2/100 - there is just not room inside. In the K2/10 you might find
room for the transformers, but that depends on the particular options
you have installed.

You may not need the transformers if you follow the guidelines offered
by Jim Brown W9YC - see http://haminterfacing.pdf for more information.

73,
Don W3FPR

Rudi wrote:

> Hello FM,
>
> I would like to do some digi modes with my K2.
>
> I don't like external interface and would like to install something inside
> the K2.
>
> I saw on internet a board from en EA station, but it seems that this is not
> availiable anymore.
>
> All info is welcome.
>
> Best 73 - Rudi - ON7CL / KB8TAB
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.791 / Virus Database: 271.1.1/2758 - Release Date: 03/19/10 18:07:00
>
>

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Don Wilhelm-4

Re: K2 and Digi Modes

The link I provided below for Jim Brown's HamInterfacing document is
incomplete (Blame Jim, I copied it from one of his posts :-) ).
Use http://audiosystemsgroup.com/HamInterfacing.pdf instead.

73,
Don W3FPR

Don Wilhelm wrote:

> Rudi,
>
> Take a look at the W3FPR Fixed Audio Output that can be found on Tom
> Hammond's website www.n0ss.net.
> Unfortunately, Tom no longer offers the boards but has offered to
> provide the PC board data to anyone who wants it. You could easily wire
> the circuit on a piece of perfboard. That takes care of the output
> (without isolation transformers), but you are on your own for the input
> side. If you have no need for switching between digital input and a
> microphone, there is nothing wrong with putting a resistive attenuator
> on the Mic AF line inside the K2 - you can easily break the line at the
> microphone configuration header and add a couple resistors at that point.
>
> If you use RTS or DTR from the serial port for PTT, you will certainly
> have to place the one transistor interface (or optoisolator) for that
> outside the K2. I guess one could butcher the KIO2 or AUX I/O internal
> K2 signal lines on the KPA100, but that would make it unusable fo
> connecting an external Elecraft device like the KAT100, the XV series
> transverters or the KRC2, and I would not recommend doing that.
>
> Any isolation transformers may have to live outside the K2 if it is a
> K2/100 - there is just not room inside. In the K2/10 you might find
> room for the transformers, but that depends on the particular options
> you have installed.
>
> You may not need the transformers if you follow the guidelines offered
> by Jim Brown W9YC - see http://haminterfacing.pdf for more information.
>
> 73,
>
>

Doug Faunt N6TQS +1-510-655-8604

Re: K2 and Digi Modes

I still have 5 of the boards for the W3FPR Fixed Audio Output,
one of which is fully populated and tested.

I had EA3BLQ's digital interfaces in both my K2's, but connector space
on the back panel got to be a hassle, and they were no longer
available. So I went with the W3FPR version, which could be (and was)
installed in a K2 in DXpedition conditions. But I ended up with
extras, so....

I don't recall what I paid for them, but I'll send the populated one
to Rudi for postage, and one of the blank boards to anyone else for a
SASE to my callbook address.

73, doug

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Don Wilhelm-4

Re: K2 and Digi Modes

Doug,

You might want to mention which version of the fixed audio board you
have. The original one had the electrolytic capacitors standing up on
the board, and the instructions for that board are on my website
www.w3fpr.com. The later board had the components laying down and would
fit between the front panel and control board. For instructions on that
board, look at www.n0ss.net.
To give credit where it is due - Tom Hammond did the board layout for
both boards. I sold the first version, and Tom sold the 2nd version boards.

73,
Don W3FPR

Doug Faunt N6TQS +1-510-655-8604 wrote:

> I still have 5 of the boards for the W3FPR Fixed Audio Output,
> one of which is fully populated and tested.
>
> I had EA3BLQ's digital interfaces in both my K2's, but connector space
> on the back panel got to be a hassle, and they were no longer
> available. So I went with the W3FPR version, which could be (and was)
> installed in a K2 in DXpedition conditions. But I ended up with
> extras, so....
>
> I don't recall what I paid for them, but I'll send the populated one
> to Rudi for postage, and one of the blank boards to anyone else for a
> SASE to my callbook address.
>
> 73, doug
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.791 / Virus Database: 271.1.1/2759 - Release Date: 03/20/10 03:33:00
>
>

Doug Faunt N6TQS +1-510-655-8604

Re: K2 and Digi Modes

I actually used miniature caps and have them standing up. It installs
behind the front panel on a small standoff very nicely, with the pot
accessible from the top with only the cover off, so the level can be
adjusted using a signal through the radio.
I think I got the boards from Tom, but it's been a while.

And all that I have are committed now.

73, doug

X_CMAE_Category: 0,0 Undefined,Undefined
Date: Sat, 20 Mar 2010 13:13:01 -0400
From: Don Wilhelm <[hidden email]>

Doug,

You might want to mention which version of the fixed audio board you
have. The original one had the electrolytic capacitors standing up on
the board, and the instructions for that board are on my website
www.w3fpr.com. The later board had the components laying down and would
fit between the front panel and control board. For instructions on that
board, look at www.n0ss.net.
To give credit where it is due - Tom Hammond did the board layout for
both boards. I sold the first version, and Tom sold the 2nd version boards.

73,
Don W3FPR

Doug Faunt N6TQS +1-510-655-8604 wrote:
> I still have 5 of the boards for the W3FPR Fixed Audio Output,
> one of which is fully populated and tested.
>
> I had EA3BLQ's digital interfaces in both my K2's, but connector space
> on the back panel got to be a hassle, and they were no longer
> available. So I went with the W3FPR version, which could be (and was)
> installed in a K2 in DXpedition conditions. But I ended up with
> extras, so....
>
> I don't recall what I paid for them, but I'll send the populated one
> to Rudi for postage, and one of the blank boards to anyone else for a
> SASE to my callbook address.
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Don Wilhelm-4

Re: K2 and Digi Modes

Doug,

Since the boards have the pot, they are definitely from my batch - Tom's
had two fixed resistors in place of the pot which worked well because
the level could be adjusted with the soundcard controls. Those who get
your boards should look at the instructions on my website www.w3fpr.com.

73,
Don W3FPR

Doug Faunt N6TQS +1-510-655-8604 wrote:

> I actually used miniature caps and have them standing up. It installs
> behind the front panel on a small standoff very nicely, with the pot
> accessible from the top with only the cover off, so the level can be
> adjusted using a signal through the radio.
> I think I got the boards from Tom, but it's been a while.
>
> And all that I have are committed now.
>
> 73, doug
>
> X_CMAE_Category: 0,0 Undefined,Undefined
> Date: Sat, 20 Mar 2010 13:13:01 -0400
> From: Don Wilhelm <[hidden email]>
>
> Doug,
>
> You might want to mention which version of the fixed audio board you
> have. The original one had the electrolytic capacitors standing up on
> the board, and the instructions for that board are on my website
> www.w3fpr.com. The later board had the components laying down and would
> fit between the front panel and control board. For instructions on that
> board, look at www.n0ss.net.
> To give credit where it is due - Tom Hammond did the board layout for
> both boards. I sold the first version, and Tom sold the 2nd version boards.
>
> 73,
> Don W3FPR
>
> Doug Faunt N6TQS +1-510-655-8604 wrote:
> > I still have 5 of the boards for the W3FPR Fixed Audio Output,
> > one of which is fully populated and tested.
> >
> > I had EA3BLQ's digital interfaces in both my K2's, but connector space
> > on the back panel got to be a hassle, and they were no longer
> > available. So I went with the W3FPR version, which could be (and was)
> > installed in a K2 in DXpedition conditions. But I ended up with
> > extras, so....
> >
> > I don't recall what I paid for them, but I'll send the populated one
> > to Rudi for postage, and one of the blank boards to anyone else for a
> > SASE to my callbook address.
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.791 / Virus Database: 271.1.1/2759 - Release Date: 03/20/10 03:33:00
>
>

Doug Faunt N6TQS +1-510-655-8604

Re: K2 and Digi Modes

Yep, the board shown on your site is the one. I used a miniature pot
(1/4" square) that fits the board pattern, with the adjustment screw
parallel to the board so it can be reached from above. I used an 1/8w
resistor, miniature 3 x 5mm electrolytic caps, and an 1/8" standoff to
mount it. When I get a camera again, I can take photos of the board
in a K2 since I have to replace the earphone jacks on both K2's.

73, doug

Date: Sat, 20 Mar 2010 14:18:28 -0400
From: Don Wilhelm <[hidden email]>

Doug,

Since the boards have the pot, they are definitely from my batch - Tom's
had two fixed resistors in place of the pot which worked well because
the level could be adjusted with the soundcard controls. Those who get
your boards should look at the instructions on my website www.w3fpr.com.

73,
Don W3FPR

Doug Faunt N6TQS +1-510-655-8604 wrote:
> I actually used miniature caps and have them standing up. It installs
> behind the front panel on a small standoff very nicely, with the pot
> accessible from the top with only the cover off, so the level can be
> adjusted using a signal through the radio.
> I think I got the boards from Tom, but it's been a while.
>
> And all that I have are committed now.
>
> 73, doug
>
> X_CMAE_Category: 0,0 Undefined,Undefined
> Date: Sat, 20 Mar 2010 13:13:01 -0400
> From: Don Wilhelm <[hidden email]>
>
> Doug,
>
> You might want to mention which version of the fixed audio board you
> have. The original one had the electrolytic capacitors standing up on
> the board, and the instructions for that board are on my website
> www.w3fpr.com. The later board had the components laying down and would
> fit between the front panel and control board. For instructions on that
> board, look at www.n0ss.net.
> To give credit where it is due - Tom Hammond did the board layout for
> both boards. I sold the first version, and Tom sold the 2nd version boards.
>
> 73,
> Don W3FPR
>
> Doug Faunt N6TQS +1-510-655-8604 wrote:
> > I still have 5 of the boards for the W3FPR Fixed Audio Output,
> > one of which is fully populated and tested.
> >
> > I had EA3BLQ's digital interfaces in both my K2's, but connector space
> > on the back panel got to be a hassle, and they were no longer
> > available. So I went with the W3FPR version, which could be (and was)
> > installed in a K2 in DXpedition conditions. But I ended up with
> > extras, so....
> >
> > I don't recall what I paid for them, but I'll send the populated one
> > to Rudi for postage, and one of the blank boards to anyone else for a
> > SASE to my callbook address.
> >
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html