> 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: [email protected] > [mailto:[email protected]] On Behalf Of Bill W4ZV > Sent: Tuesday, February 16, 2010 10:18 AM > To: [email protected] > 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 -- View this message in context: http://n2.nabble.com/P3-tp4576865p4580749.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
