TX Inhibit options

[Edward R Cole]

Roger,

Just to be sure before writing you, I tested my K3 by pressing the
XMIT key and the K3 goes immediately into Tx-mode but unless there is
modulation in SSB/DATA or the CW key is pressed there is no RF
output.  If I press and hold so that the K3 goes into TUNE then RF is
immediately output on 28-MHz.

But in no way does my 144-MHz transverter transmit before the INHIBIT
line allows it.  Transmitting 1.5mw into the transverter without
switching the transverter into Tx-mode does no harm and no 144-MHz RF
is output.  This is using the INHIB function on the K3 being enabled
in the proper time by the sequencer that I use.  I enable the INHIB
function by use of the BAND-0 line (you might come up with a
different way) so that INHIB only functions when I am on 144-MHz and
above.  See:
http://www.kl7uw.com/TX-INHIBIT.htm

As you can see from the diagram I key the radio with my TX2 relay in
my sequencer which defeats the INHIB on the K3 by grounding pin-7 of
the ACC jack.  You do have to set up for the K3 to be in Inhibit by
setting CONFIG: Tx INH to either in HI=Inh or LO=inh.  I use HI=Inh.


-----------------------
Message: 12
Date: Wed, 29 Jun 2011 02:36:29 -0700 (PDT)
From: Roger Banks <[hidden email]>
Subject: [Elecraft] TX Inhibit options
To: [hidden email]
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=us-ascii

Hi All.
I am using a K3 with internal 144 transverter module.
On 2m I use a sequencer for TX/RX as I use a PA and a LNA at the masthead.
The rig TX is triggered by the sequencer by using the PTT In line.
The sequencer ensures the rig is switched after the LNA. The sequencer is
triggered either by a foot switch or by the signalink Data line.
The problem I have is that there is a HUGE risk (and I have done it) of
inadvertantly using the manual TX button on the front of the K3. If this is
done the rig goes to TX and teh sequencer is bypassed - thus blowing the
LNA.. ouch.
This issue is compounded by the fact that on all other bands I need
conventional operation of the ring as there is obviously no problem with
sequencers elsewhere and you get used to using eiher ptt or the tx button.
Question then - is there a way of disabling/inhibiting the TX button/ mic
socket ptt on the rig just on 2m so that on 2m you can only instigate TX via
the back panel PTT in line?
Help appreciated!
Roger Banks
GW4WND



73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep [hidden email]
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