K3 TX Inhibit

[John Lemay]

Hello

I have a question about the TX INHibit function of the K3.

I want to use this with an external sequencer to ensure that my rig,
amplifier and masthead preamplifier (on 2m) are controlled in a safe manner,
and that even pressing the XMIT button or turning on VOX does not lead to a
mishap.

However, TX INHibit does not work as I expected:-

I have turned on TX INH with LO = INH. I have plugged a lead into the 15 pin
accessory socket so that pin 7 can be held low (in my test case, connected
to earth). That works fine and TX is inhibited (indicated by the flashing TX
icon).

When I remove the earth connection from pin 7 the rig remains with TX
inhibited - that's the bit I don't understand.

I can only get back to normal transmit operation by going back into the
CONFIG menu and turning off TX INH.

What am I missing ?

Regards

John G4ZTR

 

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[Win Kriegl DK9IP/KH7CD]

Hi John,

when TX INH ist set to LO in the Menu an external pull-up resistor
between abt. 2.2 to 10 kOhm (to 5 VDC) is required at pin 7. This should
solve your problem. See also K3 owner´s manual.

73, Win DK9IP





Am 02.12.2011 20:35, schrieb John Lemay:

> Hello
>
> I have a question about the TX INHibit function of the K3.
>
> I want to use this with an external sequencer to ensure that my rig,
> amplifier and masthead preamplifier (on 2m) are controlled in a safe manner,
> and that even pressing the XMIT button or turning on VOX does not lead to a
> mishap.
>
> However, TX INHibit does not work as I expected:-
>
> I have turned on TX INH with LO = INH. I have plugged a lead into the 15 pin
> accessory socket so that pin 7 can be held low (in my test case, connected
> to earth). That works fine and TX is inhibited (indicated by the flashing TX
> icon).
>
> When I remove the earth connection from pin 7 the rig remains with TX
> inhibited - that's the bit I don't understand.
>
> I can only get back to normal transmit operation by going back into the
> CONFIG menu and turning off TX INH.
>
> What am I missing ?
>
> Regards
>
> John G4ZTR
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus signature
> database 6678 (20111202) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
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Please help support this email list: http://www.qsl.net/donate.html