[Elecraft] P3 Questions

[Rick Prather]

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