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)" <[email protected]>
To: [email protected]
Subject: Re: [Elecraft] Powering a K3s from a battery?
Message-ID: <[email protected]>
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:
[email protected]
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