[Elecraft] KX3 Power cable

[Jonathan Poland]

Dave,

I sell a product at http://stores.ebay.com/N0WL-Radio that goes a long 
way to solving your concern.  It is a Anderson PowerPole adapter for the 
KX3. (I have designs for the KX2 and FT-817 also.)

This adapter uses a 3D printed shell to securely attach the adapter to 
the KX3, keeping the length of the low gauge wire to an absolute 
minimum.  There are other advantages to using an adapter like this - you 
can see them on the website.

Please note that this current design cannot be used with an after-market 
heat sink.  I will have another product for that shortly. Elecraft uses 
available space on the left side of the radio so efficiently that it is 
very hard creating a design that I would be happy to take into the field.

jon poland, n0wl


On 1/31/2018 08:49, Dave Sublette wrote:
> Good morning,
>
> I am using the standard power cable that is supplied with the KX3.  Using a
> digital multi meter and the built in voltage monitoring capability of the
> KX3, it looks like the supply voltage is dropped by 0.5 volts in the power
> cord when transmitting with 5 watts  According to the built in monitor, the
> KX3 is pulling 1.6 amps from my gel cell.
>
> The gel cell voltage drops also, but I compensated for that when I
> calculated the .5 volt drop in the power cord.
>
> It seems to me that a larger gauge wire is called for in the power cord.
>
> Also, I can't get the KX3 to transmit more than 5 watts.  If I turn the
> power up to 10 watts, it transmits at that level briefly, then turns the
> power down to 5 watts.  It must be some voltage sensing circuit that does
> it.  The supply voltage is showing 11.4 VDC when keyed..
>
> So what about the gauge of wire for the power cord?  Do you think we need a
> larger sized wire?
>
> 73,
>
> Dave, K4TO
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