[Elecraft] Elecraft KX3 Owner's Manual now available (*preliminary*)

[W7GJ, Lance]

Hi Jim,

TNX for your email and comments.  Yes, I understand what you are saying and 
appreciate that you have had good success running VOX with your QSK-capable amplifiers.

However, my solid state 6M-1000 amplifier has a little mechanical antenna relay in 
it, and the last thing I can afford to do is to hot switch that amp on a 6m EME 
DXpedition and blow up the transistors and/or the little transfer relay inside it. 
If there is ANY WAY that I can rig up the KX3 and amp to be switched into XMIT mode 
ahead of time via the RTS line, I much prefer to do that and take advantage of that 
very convenient safety feature that is built into the WSJT software.

Wayne's suggestion that there may be a way to send an RTS signal to the GPIO 
connection on the tip of the ACC2 plug is very intriguing, and I am just trying to 
figure out what interface cable(s) I would use and what I would need to build to be 
able to maintain the ACC1 operation along with the amp activation through the ACC2, 
while adding the RTS line from somewhere to the tip of the ACC2 cable ;-)

VY 73, Lance

On 3/5/2012 6:34 PM, Jim Brown-10 [via Elecraft] wrote:
> On 3/5/2012 9:43 AM, Lance Collister, W7GJ wrote:
>  > Looks like I will have to get a second USB cable for the KX3, and
>  > build some sort of interface that will plug into the KX3's custom mic
>  > jack to trigger the PTT.
>
> Lance,
>
> As I noted in a post on this topic to the WSJT list, VOX works just fine
> for WSJT signals fed to the line input with well-behaved rigs and
> well-behaved amps. By well-behaved I mean having suitable delays
> between a TX line controlling the power amp and the beginning of RF at
> the output of the exciter, AGC within the exciter that prevents power
> spikes at the beginning of TX, and fast, dependable antenna switching
> that positively prevents hot switching. The Ten Tec and Alpha amps have
> done that for at least three decades, and so does the Elecraft KPA500.
>
> I use nothing but VOX for digital and SSB modes with my K3s driving
> Titans during contests, and my KPA500 for casual operation. During the
> recent ARRL RTTY Roundup and WPX RTTY contests alone I made nearly 3,000
> QSOs, and it's been at least 3-4 years since I replaced a vacuum relay
> in one of the Titans.
>
> 73, Jim K9YC
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-- 
Lance Collister, W7GJ
(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ)
P.O. Box 73
Frenchtown, MT   59834-0073
USA
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Skype: lanceW7GJ
2m DXCC #11/6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME
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