[Elecraft] P3

[Joe Subich, W4TV]

> I'd like to see some specs for the P3 to know that it really 
> has the sensitivity to do this.  The IF OUT mod regains ~10 
> dB of the signal lost in the original design but I believe 
> that still leaves ~7 dB that may be lost, according to Jack 
> Smith's measurements:

~7 dB is correct when the IF out is driving a 50 Ohm load.  
Drive a high impedance load (e.g., the 200 Ohm input of Jack's 
amplifier) and the "loss" is 1 dB.  I believe Jack has a more 
complete explanation in the Z-10000 amplifier manual. 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill W4ZV
> Sent: Tuesday, February 16, 2010 10:18 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] P3
> 
> 
> 
> 
> Kok Chen wrote:
> > 
> > 
> > Spectrograms, such as "waterfalls," make use of your 
> eye-brain system 
> > to help find signals that are below the noise level, 
> especially when 
> > signals are drifting and don't allow temporal averaging methods.
> > 
> > <SNIP>
> > 
> > With the addition of some special filtering, you can make a 
> waterfall 
> > see even deeper into the noise when the signal is not drifting.
> > 
> 
> I'd like to see some specs for the P3 to know that it really 
> has the sensitivity to do this.  The IF OUT mod regains ~10 
> dB of the signal lost in the original design but I believe 
> that still leaves ~7 dB that may be lost, according to Jack 
> Smith's measurements:
> 
> http://cliftonlaboratories.com/elecraft_k3_and_panadapters.htm
#What_then_is_the_transfer_gain_of_the_K3_

73,  Bill

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