[Elecraft] P3 Questions

[Alan Bloom]

Rick,

That's what I'm working on right now.

73,

Alan N1AL


On Fri, 2010-10-29 at 17:20 -0700, Rick Prather wrote:
> Alan,
> 
> My S9 appears to be off by about 10db.  How are you coming on a level calibration routine?
> 
> TIA,
> Rick
> K6LE
> 
> 
>  
> On 10/29/2010, at 3:23 , Alan Bloom wrote:
> 
> > A noise level of -140 dBm is reasonable with no antenna connected or a
> > quiet band.  It also depends on the span and how you have the K3 set up.
> > On mine, the noise level is around -160 dBm with no antenna connected to
> > the K3, the K3 preamp turned on, and the span set to 2 kHz.  If I turn
> > off the preamp, turn on the attenuator, and set the span to 200 kHz, the
> > noise level is a little below -120 dBm.  With an antenna connected it is
> > higher than that.
> > 
> > You can get an idea if everything is working right by comparing the K3
> > S-meter reading of a signal within the receive passband.  S9 should show
> > as roughly -73 dBm on the P3 display and change by 6 dB per S-unit below
> > that.  There's a table of dBm levels versus S-units in the latest P3
> > manual.
> > 
> > Alan N1AL