[Elecraft] P3 Question

[Craig D. Smith]

Here's a simple (hopefully) question that I'm sure one or more of you RF
gurus can easily handle.  But I'm having difficulty with it, at least today.

I was wondering what baseline level I should be seeing on my P3 with the
input terminated in 50 ohms (no signal in).  This isn't given in the
specifications.  But the noise figure is given (less than 10 dB) so I
figured it would be easy to calculate with the usual sensitivity formula as
a function of noise figure.  Of course you need Boltzman's constant (no
problem), temperature (no problem), and desired S/N ratio (assume 5 dB).
But what should I use for bandwidth, since with the P3 there isn't a normal
bandwidth filter in the circuit such as with the K3.  Do I use the full 200
KHz maximum span?  Something else?  

My P3 shows about -132 dBm with its input terminated.  And about -130 dBm
when connected to the K3 with the K3 antenna inputs terminated.  Is this in
the expected range?

73   Craig   AC0DS