[Elecraft] K3_P3_160_CW

[Ken Roberson]

Alan,

Thank you for info , I knew it was a firmware bug ,did not know that it had been reported.

Sorry for the bandwidth .

73 Ken K5DNL
-----------------------------------------------------------


--- On Sun, 4/17/11, Alan Bloom <n1al at sonic.net> wrote:

> From: Alan Bloom <n1al at sonic.net>
> Subject: Re: [Elecraft] K3_P3_160_CW
> To: "Ken Roberson" <kwroberson at yahoo.com>
> Cc: "Elecraft Elecraft" <elecraft at mailman.qth.net>
> Date: Sunday, April 17, 2011, 11:20 PM
> The P3 keeps track of the
> preamp/attenuator status reported by the K3 so
> that the dBm or S-unit display reads accurately.  That
> can lead to some
> non-intuitive behavior.  For example, turning on the
> K3 preamp typically
> makes the noise level on the P3 go down rather than
> up.  The reason is
> that the P3 is turning down its gain to compensate for the
> increased
> gain in the K3.
> 
> However this doesn't always work correctly when switching
> the RX antenna
> on the K3.  Currently the K3 does not send an update
> to the P3 if
> switching antennas causes the preamp or attenuator status
> to change.
> This is on Wayne's bug list.
> 
> Alan N1AL
> 
> 
> On Sun, 2011-04-17 at 12:21 -0700, Ken Roberson wrote:
> > Wayne,
> > 
> > While working 160M DX last winter I noticed that when
> I
> > Switch from RX antenna (Beverage) and back to TX
> antenna
> > That the base line (Noise floor) on the P3 was about 2
> S unites
> > Less than when I changes to the RX antenna.
> > 
> > With the default antenna ( TX antenna ) PreAmp = off
> and ATT = ON
> > Switch to RX antenna (with the preamp off) turn the
> preamp on and switch back to normal antenna.
> > Now if you switch the preamp on and off, the base line
> will return to normal.
> > Hard for me to explain.
> > 
> > Thanks Ken K5DNL
> > 
> >
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