K3 -- RFI from external keyer holds PTT in DATA A mode

[Nate Bargmann]

This was wierd.  I have a Ham Gadgets Master Keyer 1 that seems to be a
bit susceptable to RFI (not an issue for this list).  Last night I
decided to work PSK31 on 40m.  My setup with Fldigi uses the rig control
command to key and unkey the radio, no hardware PTT is used.  The only
connections to the K3 were the MK1 to the Key jack and a single lever
paddle to the Paddle jack as well as the Line In/Out to the computer and
desk mic to the front panel as well as the serial cable to the PC jack.

The problem was that when the PSK transmission ended the K3 stayed in
TX.  As I had experienced RFI on 160m CW from the MK1 before that kept
the TX keyed, I uplugged it first and thereafter did not experience the
problem with PTT remaining on.  I'll need to resolve the MK1's issue
separately.

Here is my question about the K3, it seems to me that when in DATA A mode
that the state of the KEY jack should be ignored.  Even if KEY has a
closure, it should not impact PTT in DATA A or SSB modes, or am I
mistaken.

73, de Nate >>

--

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

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[Scott Ellington]

The K3 is the first rig I've used which switches to the transmit mode when the key is closed in PTT mode (on CW).  It doesn't actually transmit, of course, but the the receiver mutes and Key Out closes.  Where Key Out is used to control an amplifier and/or external antenna relay, those also switch to transmit mode.  It would seem to make more sense for the K3 to ignore the key input in PTT mode when PTT IN is open.  Or is there a good reason for this behavior that I'm missing?

73,

Scott  K9MA


On Dec 1, 2010, at 8:24 AM, Nate Bargmann wrote:

>
> Here is my question about the K3, it seems to me that when in DATA A mode
> that the state of the KEY jack should be ignored.  Even if KEY has a
> closure, it should not impact PTT in DATA A or SSB modes, or am I
> mistaken.
>
> 73, de Nate >>
>
>

Scott Ellington
Madison, Wisconsin
USA



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