[Elecraft] Possible firmware regression related to ACC2 IO / PTT=LO

[Wayne Burdick]

No intentional change was made to this, Mark.

Please try activating the PTT=LO function of ACC2 manually, by  
shorting the signal to ground. If that works correctly, but it doesn't  
work from your 590's keyline, then I'd suspect the connection.

73,
Wayne
N6KR

On Dec 14, 2012, at 9:05 PM, K7MJG wrote:

> Hello,
>
>
>
> In my setup, I use the KX3 as a receiver (only) and a TS-590s as a  
> 100 watt
> transmitter. (Until the KXPA100 comes out.)  To prevent damage to  
> the KX3
> receiver while transmitting 100W from the TS-590, I have connected  
> the 590
> to the ACC2 port of the KX3 and set the ACC2 IO to PTT=LO.  This has  
> worked
> well for me so far.  When the 590 is keyed up, the KX3 goes into  
> transmit
> (with the TX light illuminated) and the receiver is shut off.
>
>
>
> However, recently, (probably with the latest 1.30 firmware release),  
> I see
> something strange and certainly dangerous to my KX3.  When I key up  
> the 590
> (a quick dit with 5 watts - the minimum), the KX3 TX light goes on,  
> but I
> can see what I am transmitting (CW) on my CW Skimmer screen!  I can  
> tune the
> 590 to other frequencies and CW skimmer follows the 590's TX  
> frequency.
> This tells me that the KX3 is actually receiving what I'm  
> transmitting with
> the 590 even though the TX light is on and the RX should be  
> disabled. Note
> that the KX3's S-meter is not deflected (no apparent signal).
>
>
>
> Can someone (possibly one of the firmware engineers at Elecraft)  
> tell me if
> a recent behavioral change was made to the ACC2 PTT controls?  If  
> the change
> was intentional, is there an alternate mechanism to satisfy my use  
> case?
>
>
>
> 73,
>
> Mark Glenn
>
> K7MJG
>
>
>
>
>
> --
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