Elecraft

VOX / PTT combination on k3

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s57aw

VOX / PTT combination on k3

Hi,

Simple question... Is there a way to avoid VOX delay on CW mode when PTT is
used?

To be more concrete:

- CW and PTT signal are sent to K3 with N1MM directly from serial port (no
external keyer)
- external electronic keyer is connected to K3
- VOX is enabled

If I want CW keyer to work without PTT / paddle then VOX has to be enabled,
but VOX brings unwanted delay at the end when CW is sent from PC.

73 Robert, S57AW
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Mike K2MK

Re: VOX / PTT combination on k3

Hi Robert,

If you are using VOX there should be no difference in the delay between using your paddle and using your PC. It sounds like N1MM is still sending a PTT command over the serial link. You can prove this by changing CONFIG:PTT-KEY to OFF-OFF on your K3.

73,
Mike K2MK

s57aw wrote

Hi,

Simple question... Is there a way to avoid VOX delay on CW mode when PTT is
used?

To be more concrete:

- CW and PTT signal are sent to K3 with N1MM directly from serial port (no
external keyer)
- external electronic keyer is connected to K3
- VOX is enabled

If I want CW keyer to work without PTT / paddle then VOX has to be enabled,
but VOX brings unwanted delay at the end when CW is sent from PC.

73 Robert, S57AW

Richard Ferch

Re: VOX / PTT combination on k3

In reply to this post by s57aw

Once you have enabled VOX, you are stuck with whatever delay it imposes.
In effect, the VOX and PTT functions are in a logical OR relationship -
if either one of them wants the rig to be in transmit, it will be in
transmit. In your current setup you could disable computer PTT control
entirely and you would not see any difference.

There is a way to set the VOX delay to nearly zero, and that is to
enable QSK. With PTT and QSK enabled, your computer messages will be
controlled by PTT (no RX between characters), but your paddle-sent CW
will be QSK. If you are using a non-QSK amplifier, this won't work for you.

Without using QSK, you can reduce the VOX delay in the K3, but if you
are using an external amplifier that is not capable of QSK, the
amplifier may impose a lower limit on the VOX delay you can safely use,
i.e. you may want to have a VOX delay long enough to prevent returning
to RX between characters, and maybe also between words, during paddle
input, and that VOX delay will also affect the end of computer messages.

If you have an external keyer that has a PTT output, you can wire-OR the
keyer's PTT output with the PTT signal from the computer. When the
computer is sending, PTT will be asserted by the computer and there will
be no RX during messages, but no delay in the return to RX at the end of
the messages. When you are sending from the paddle, the delay will be
controlled by the keyer's PTT settings. If you have a non-QSK amplifier
you will have to configure the delay in the keyer to accommodate the
amplifier, but the delay will only apply to paddle-sent CW, not to
computer-sent messages.

73,
Rich VE3KI

S57AW wrote:

> Simple question... Is there a way to avoid VOX delay on CW mode when PTT is
> used?
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Dave Hachadorian-2

Re: VOX / PTT combination on k3

In reply to this post by s57aw

The WinKey http://k1el.tripod.com/ , in conjunction with N1MM
Logger+, does this beautifully. It has separate delay
adjustments for paddle-generated and computer-generated CW. You
can set the computer delay to zero and the paddle delay to a hang
time of 1 to 2 letter spaces, so the paddle delay works at any
speed.

Dave Hachadorian, K6LL
Yuma, AZ

-----Original Message-----
From: Robert Bajuk
Sent: Saturday, December 19, 2015 5:28 AM
To: [hidden email]
Subject: [Elecraft] VOX / PTT combination on k3

Hi,

Simple question... Is there a way to avoid VOX delay on CW mode
when PTT is
used?

To be more concrete:

- CW and PTT signal are sent to K3 with N1MM directly from serial
port (no
external keyer)
- external electronic keyer is connected to K3
- VOX is enabled

If I want CW keyer to work without PTT / paddle then VOX has to
be enabled,
but VOX brings unwanted delay at the end when CW is sent from PC.

73 Robert, S57AW
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Brian Hunt

Re: VOX / PTT combination on k3

In reply to this post by s57aw

I do pretty much what you want to do: use N1MM+ and paddle/external keyer.

I have: paddle connected directly to the K3; QSK selected; VOX selected; PTT/KEY set to off/dtr; and N1MM+ keying through the serial port dtr line. It gives full QSK to hear other stations between characters.

73,
Brian, K0DTJ
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s57aw

Re: VOX / PTT combination on k3

TNX guys, you were very helpful

73 Robert, S57AW

On Sun, Dec 20, 2015 at 12:40 AM, Brian Hunt <[hidden email]>
wrote:

> I do pretty much what you want to do: use N1MM+ and paddle/external keyer.
>
> I have: paddle connected directly to the K3; QSK selected; VOX selected;
> PTT/KEY set to off/dtr; and N1MM+ keying through the serial port dtr line.
> It gives full QSK to hear other stations between characters.
>
> 73,
> Brian, K0DTJ
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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