[Elecraft] K3 cleanest signal possible

[Matt Zilmer]

Fred,

The N8XJK booster does put out a bit of RFI on HF.  It's not enough to
cause problems here, but might be at an ultra low-noise QTH.  I've
noticed this on receive, but haven't looked at TX spectral purity.
Wayne may have a definitive answer on this.

73,
matt
W6NIA

On Mon, 19 Jan 2015 10:15:41 -0800, you wrote:

>Wayne all I can say is wow! I knew the K3 was good but I had no idea it was
>that much better. Let's hope the other manufactures adopt the most sincere
>form of flattery... they copy the K3. After all that benefits all listeners.
>
>
>My question relates to Matt's use of a battery booster. In theory this
>allows the K3 to use maximum feedback and therefore have an even cleaner
>signal. However my experience with battery boosters, not necessarily the one
>Matt uses, is they are dirty in terms of electrical noise. The lower the
>input voltage the dirtier they get. What is the K3s sensitivity to power
>input noise. In short is the battery booster concept a net gain in terms of
>spectral purity?
>
>73
>Fred, AE6QL
>
>-----Original Message-----
>From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wayne
>Burdick
>Sent: Monday, January 19, 2015 9:22 AM
>To: Kjeld Holm
>Cc: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 cleanest signal possible
>
>Hi Kel,
>
>The K3/100's phase noise and ALC artifacts are so low at all power levels
>that you shouldn't need to finesse this. I would select power level based on
>what you want to get out of the amp.
>
>See W9YC's study of transmit phase noise and keying bandwidth of various
>transceivers:
>
>    http://audiosystemsgroup.com/TXNoise.pdf
>
>73,
>Wayne
>N6KR 
>
>
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Matt Zilmer, W6NIA
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