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

[K7MJG]

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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