K3 current status of TX INH?

[Dave, G4AON]

Barry

I run a K3/100 with an Acom 1000 on CW and can confirm the Acom 1000
doesn't need TX inhibit wiring. I cannot comment on other Acom
amplifiers. While the manual doesn't state the change over time of the
amplifier, discussion with the UK importer suggests it is changed over
prior to the 10 mS delay present with the K3 before RF appears.

The connections are a single phono to phono screened lead between the K3
and Acom for the keying and PL259 to PL259 for RF.

73 Dave, G4AON
K3/100 #80


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[Barry N1EU]

Thanks for the response Dave.  Yes the Acom (and other amps w. qsk keying loops) will work well without TX EN/INH wired.  But Acom recommends using it whenever possible.  It provides not only a safety valve to cutoff the transmitter instantly when there's a serious fault in the amp, but also potentially provides improved qsk if the transceiver's timing fully supports the keying loop.

I was just informed of a reflector posting of Dec 23 that I must have missed (apologies) from Jerry N8BM at http://mailman.qth.net/pipermail/elecraft/2007-December/079341.html

It's obvious upon reading Jerry's posting that an amplifier keying loop function is NOT yet implemented on the K3, despite the firmware change to TX INH - there's currently no way to get the K3 out of inhibit mode and begin xmsn if it ignores PTT/key input while in inhibit mode.

So all we can do is wait and hopefully Elecraft will eventually announce that they have indeed implemented support for amplifier keying loop in a new firmware update.

73,
Barry N1EU

Dave G4AON wrote

Barry

I run a K3/100 with an Acom 1000 on CW and can confirm the Acom 1000
doesn't need TX inhibit wiring. I cannot comment on other Acom
amplifiers. While the manual doesn't state the change over time of the
amplifier, discussion with the UK importer suggests it is changed over
prior to the 10 mS delay present with the K3 before RF appears.

The connections are a single phono to phono screened lead between the K3
and Acom for the keying and PL259 to PL259 for RF.

73 Dave, G4AON
K3/100 #80


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