FT-8 Problem, KX3, Signalink USB

[Bob McGraw - K4TAX]

Do be reminded that the audio from the computer does in effect key the
VOX circuit in the Signalink.  That issues a hard PTT command to the
radio.  Then the audio from the computer via the Signalink, with VOX on
in the radio, is another transmit command. Then with CAT control from
the computer to the radio for PTT that is a third transmit command.   
Choose one!

If the audio from the computer does not key the LED on the Signalink
then there is no transmit command from the Signalink source.  If it does
then the Delay on the Signalink slows the transition to receive.     If
the VOX level is set such that the audio from the computer via the
Signalink is low then the VOX won't key the transmitter.   Of course if
there is noise on the audio path, that noise will activate the VOX in
the radio, hence it stays in transmit.     {Why does one have VOX on
anyway?}  Then of course the computer communication to the radio can
issue a PTT command.  To me this is the smart way to handle things.

Understanding the "system" is the key to success.

73

Bob, K4TAX


Message: 8
Date: Wed, 21 Apr 2021 11:40:32 -0400
From: Carter Craigie<[hidden email]>
To: Elecraft List Members<[hidden email]>
Subject: [Elecraft] FT8 problem solved
Message-ID:
        <CAOWp2qZEE=[hidden email]>
Content-Type: text/plain; charset="UTF-8"

Thanks to a suggestion from K2UT, my WSJT-X and Signalink USB problem with
my KX3 is solved. The answer was to use VOX for PTT rather than CAT. I can
still use CAT for rig control, just not for PTT.

73, Carter N3AO
Blacksburg, VA


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Message: 9
Date: Wed, 21 Apr 2021 14:20:29 -0400
From: Don Wilhelm<[hidden email]>
To: Carter Craigie<[hidden email]>, Elecraft List Members
        <[hidden email]>
Subject: Re: [Elecraft] Problem: FT8, KX3, SignaLink USB
Message-ID:<[hidden email]>
Content-Type: text/plain; charset=utf-8; format=flowed

Carter,

Do you also have VOX active?? With both PTT and VOX on, that will happen.

On 4/21/2021 9:57 AM, Carter Craigie wrote:

> I am setting up my KX3 for FT8 using a SignaLink USB interface. My computer
> runs Windows 10.
>
> For PTT, I have checked the CAT option.
>
> When I do the test for CAT and PTT, the test works correctly. CAT tests
> okay, and PTT toggles on and off.
>
> However, in a QSO, the PTT does not work correctly. It puts the rig into
> transmit but at the end of my transmission, the SignaLink drops into
> Receive but the KX3 stays in Transmit. Stuck in Transmit. Only turning off
> the KX3 gets it out of transmit.
>
> My setup works properly for PSK31 using Ham Radio Deluxe software, so I
> believe the FT8 problem lies somehow with how I have set up WSJT-X. I've
> been told that the KX3 can get its brains scrambled in combination with a
> SignaLink by getting conflicting PTT commands.
>
> If someone is successfully using WSJT-X with a KX3 and a SignaLink USB
> interface, I would appreciate your suggestions and advice. On the reflector
> or by off-reflector e-mail is fine.
>
> Thanks very much and 73,
> Carter N3AO
> [hidden email]
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