[Elecraft] K3s - 80W on 160 - Resolved

[Nr4c]

Don't forget to multiply by two, current makes the round trip. 

Sent from my iPhone
...nr4c. bill


> On Dec 21, 2016, at 9:19 PM, John Kaufmann <john.kaufmann at verizon.net> wrote:
> 
> I use a 6-foot run of 10 gauge cable between my power supply (the Astron
> RS-35M) and my K3S.  With my Fluke DVM, I measured the voltage difference
> between the power supply output terminals and the Power Pole terminals
> inside the radio.  The difference is only .03 or .04 volts under maximum
> current draw when transmitting at full power.  In other words, the voltage
> drop across the entire length of the 10 gauge cable is negligible.  There is
> no benefit to using a large gauge wire unless you are using a really long
> (>> 6 feet) cable.
> 
> 
> 
> 73, John W1FV
> 
> 
> 
> -----------------------------
> 
> Date: Tue, 20 Dec 2016 17:34:59 -0500
> 
> From: "Gary Smith" <Gary at ka1j.com>
> 
> To: jim at audiosystemsgroup.com
> 
> Cc: Elecraft at mailman.qth.net
> 
> Subject: Re: [Elecraft] K3s - 80W on 160 - Resolved
> 
> Message-ID: <5859B213.5783.6C3A360 at Gary.ka1j.com>
> 
> Content-Type: text/plain; charset=US-ASCII
> 
> 
> 
> Hi Jim & the others who replied,
> 
> 
> 
> This is a follow-up for someone in the 
> 
> future who looks for the same solution. 
> 
> 
> 
> Yeah, the small amount of difference in 
> 
> the wattage is insignificant but 
> 
> considering all the radios I've owned, the 
> 
> low end of the bands were always the 
> 
> highest output. 10M was usually the lowest 
> 
> output & with the K3/K3s, 6M was always as 
> 
> good as the other bands watt wise and 160 
> 
> was full output. This not being the case, 
> 
> I was concerned.
> 
> 
> 
> I had done the calibration and raised the 
> 
> output to 87W but that was it. As was 
> 
> suggested, I raised the voltage from the 
> 
> PS to give me 13.8V on transmit which 
> 
> required 14.6V resting. I'm using the 
> 
> cable Elecraft supplies and I'm suspecting 
> 
> it could be just a tad lower gauge/thicker 
> 
> copper to reduce the resistance but on 
> 
> 160M, I am now getting a 115W reading on 
> 
> the P3 and 113W on the LP-100A.
> 
> 
> 
> So the increased voltage was the 
> 
> difference in my case. A thicker wire 
> 
> would certainly require less voltage than 
> 
> 14.6 and that's what I am going to look 
> 
> into. With the power Pole connector, I'll 
> 
> have to look a little deeper into what 
> 
> will work best. I have no crimping tool 
> 
> for Power Pole so that makes it more of a 
> 
> challenge.
> 
> 
> 
> Anyway, thanks Jim & all who suggested the 
> 
> higher voltage, it was the answer in this 
> 
> instance.
> 
> 
> 
> 73,
> 
> 
> 
> Gary
> 
> KA1J
> 
> 
> 
> 
> 
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