K2 CW train of dots when ptt

[Giulio Pico - IW3HVB]

I made yesterday the mod suggested by Don about having an external PTT
for CW, and a problem came up.
After I found the problem I have had a talk with the K2 owner and he
told me that the problem was present even before the mod ( He wasn't
bothered about this because he doesn't go cw on air... ).
Straight to the problem:
When I push the new PTT  in CW mode the radio starts transmitting a
train of dots when in iambic mode (tried A or B, no change) and a
fixed note when in straight key mode.
On SSB everything seems to work good, when i press the PTT foot switch
the radio goes tx regularly.
I don't use an external keyer, just a bencher iambic key connected
directly with the radio via the stereo jack on the rear panel.
I'm pretty sure about the mod (used a BS170 instead of 2N7000 and a
74HC153 instead 74AC153 but these shouldn't be a problem) and the
confirm of my friend who had this trouble before the mod made me think
about investigate somewhere else. He confirmed to me that when in CW
mode when he pressed the PTT on the mic the radio started transmitting
dots.
The key is not operational with the radio in any case (and wasn't
before the mod), neither on test mode. Tried to modify QSK delay with
no success.
Something suggest me that the problem could be in some software
configuration i can't find, or in the PTT/DOT coexistence on the same
pin of the key socket.

Any Idea????

TNX and 73 de Giulio IW3HVB

--
Follow the path of the Prophets...
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Arie Kleingeld PA3A]

Giulio,

Yes, the ptt line of the mic is the same as the dot-paddle. This is one
of the design flaws in the K2.
Don Wilhelm made a beautiful mod for this, but it is not a simple one.
You can see it on his website.

Over to you Don.


Arie PA3A


-----Oorspronkelijk bericht-----
Van: [hidden email]
[mailto:[hidden email]] Namens Giulio Pico
Verzonden: zondag 25 mei 2008 18:37
Aan: [hidden email]
Onderwerp: [Elecraft] K2 CW train of dots when ptt


I made yesterday the mod suggested by Don about having an external PTT
for CW, and a problem came up. After I found the problem I have had a
talk with the K2 owner and he told me that the problem was present even
before the mod ( He wasn't bothered about this because he doesn't go cw
on air... ). Straight to the problem: When I push the new PTT  in CW
mode the radio starts transmitting a train of dots when in iambic mode
(tried A or B, no change) and a fixed note when in straight key mode. On
SSB everything seems to work good, when i press the PTT foot switch the
radio goes tx regularly. I don't use an external keyer, just a bencher
iambic key connected directly with the radio via the stereo jack on the
rear panel. I'm pretty sure about the mod (used a BS170 instead of
2N7000 and a 74HC153 instead 74AC153 but these shouldn't be a problem)
and the confirm of my friend who had this trouble before the mod made me
think about investigate somewhere else. He confirmed to me that when in
CW mode when he pressed the PTT on the mic the radio started
transmitting dots. The key is not operational with the radio in any case
(and wasn't before the mod), neither on test mode. Tried to modify QSK
delay with no success. Something suggest me that the problem could be in
some software configuration i can't find, or in the PTT/DOT coexistence
on the same pin of the key socket.

Any Idea????

TNX and 73 de Giulio IW3HVB

--
Follow the path of the Prophets...
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com


_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Giulio Pico - IW3HVB]

2008/5/25 Arie Kleingeld PA3A <[hidden email]>:
> Giulio,
>
> Yes, the ptt line of the mic is the same as the dot-paddle. This is one
> of the design flaws in the K2.
> Don Wilhelm made a beautiful mod for this, but it is not a simple one.
> You can see it on his website.

The mod I was referring on the msg was exactly the one suggested by
Don, but still the problem seems to remain, altough the ptt input on
the new board works fine on ssb.

73 de Giulio IW3HVB
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Wilhelm-4]

I have already sent a private response to Giulio.  He apparently has
some problem with one of pins 3, 4, 5, or 6.  All these should remain
high until the key is closed.

73,
Don W3FPR

Arie Kleingeld PA3A wrote:

> Giulio,
>
> Yes, the ptt line of the mic is the same as the dot-paddle. This is one
> of the design flaws in the K2.
> Don Wilhelm made a beautiful mod for this, but it is not a simple one.
> You can see it on his website.
>
> Over to you Don.
>
>
> Arie PA3A
>
>
> -----Oorspronkelijk bericht-----
> Van: [hidden email]
> [mailto:[hidden email]] Namens Giulio Pico
> Verzonden: zondag 25 mei 2008 18:37
> Aan: [hidden email]
> Onderwerp: [Elecraft] K2 CW train of dots when ptt
>
>
> I made yesterday the mod suggested by Don about having an external PTT
> for CW, and a problem came up. After I found the problem I have had a
> talk with the K2 owner and he told me that the problem was present even
> before the mod ( He wasn't bothered about this because he doesn't go cw
> on air... ). Straight to the problem: When I push the new PTT  in CW
> mode the radio starts transmitting a train of dots when in iambic mode
> (tried A or B, no change) and a fixed note when in straight key mode. On
> SSB everything seems to work good, when i press the PTT foot switch the
> radio goes tx regularly. I don't use an external keyer, just a bencher
> iambic key connected directly with the radio via the stereo jack on the
> rear panel. I'm pretty sure about the mod (used a BS170 instead of
> 2N7000 and a 74HC153 instead 74AC153 but these shouldn't be a problem)
> and the confirm of my friend who had this trouble before the mod made me
> think about investigate somewhere else. He confirmed to me that when in
> CW mode when he pressed the PTT on the mic the radio started
> transmitting dots. The key is not operational with the radio in any case
> (and wasn't before the mod), neither on test mode. Tried to modify QSK
> delay with no success. Something suggest me that the problem could be in
> some software configuration i can't find, or in the PTT/DOT coexistence
> on the same pin of the key socket.
>
> Any Idea????
>
> TNX and 73 de Giulio IW3HVB
>
> --
> Follow the path of the Prophets...
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG.
> Version: 8.0.100 / Virus Database: 269.24.1/1469 - Release Date: 5/27/2008 1:25 PM
>  

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com