[Elecraft] Powering a K3s from a battery?

[Wes (N7WS)]

Ed,

Gosh, I didn't mean to get the faithful all riled up.  Drop me an email address.

Wes


On 12/30/2015 3:13 PM, Edward R Cole wrote:
> Wes,
>
> So you are saying all of us with K3/10 should never run at 10w+ because the 
> LPA is a terrible producer of IMD?  Does that also apply to the KX3 which is 
> also a 10-12w radio (160-24m)?
>
> I'm finding that hard to swallow considering the QRP background of the 
> Elecraft owners.
>
> I note the topic started about using a battery but you cite this is still true 
> at 14v regulated supply.
>
> Or are you saying this only about running the HPA at 10w? (which I do not 
> have).  I thought the HPA switched off below a set power level (again, not 
> something I need to know since I do not have a HPA).
>
> Wayne you want to respond on this?
>
> I'd like to think I did blow a whole lot a money on a defective design (I 
> bought both the K3/10 and KX3).
>
> Oh HNY!
> 73, Ed - KL7UW
> considering the KXPA100 a after Christmas purchase
>
>
> Date: Wed, 30 Dec 2015 09:19:41 -0700
> From: "Wes (N7WS)" <wes at triconet.org>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Powering a K3s from a battery?
> Message-ID: <5684041D.5080207 at triconet.org>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I'm not missing a thing.
>
> All I'm saying is that if you run the LPA at 10-12 watts, according to my
> measurements*, the IMD is pretty bad.  If you have an HPA, then after it's
> kicked in, (13W in my K3S) the LPA is running at greatly reduced power.  I don't
> believe Elecraft has to change anything.  Guys with a KPA3(A) just need to avoid
> the grey area of 10-15W.
>
> Wes  N7WS
>
> *Remarkably, IMD measurements I made on my K3S using modest equipment correlated
> within 1dB or less to measurements made by Elecraft, on the same radio.
>
>   On 12/30/2015 12:08 AM, Jim Brown wrote:
> > Something you're missing, Wes. The 100W amp doesn't kick in until you ask for
> > more than about 14W. So at 11-12W, you're seeing the IMD of the QRP exciter
> > stage running near it's maximum power.
> >
> > I'm wondering if it might be practical to modify the control software so that
> > the 100W amp kicks in at lower power levels. Are there other consequences?
> > Wayne?
> >
> > 73, Jim K9YC
> >
> > On Tue,12/29/2015 8:19 PM, Wes (N7WS) wrote:
> >> Something else to note, even at 14V, running a K3 at 11-12 watts is a 
> disaster.
> >
>
>
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
>     "Kits made by KL7UW"
> Dubus Mag business:
>     dubususa at gmail.com
>
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