You might want to consider buying an XG2 test generator kit from Elecraft. It would help a lot to have a signal of known level to adjust your overall gain. It would also help with image rejection adjustment, although a single carrier at S9 is a tad low for WBIR to work reliably. WBIR assumes a lot of medium strength signals. As the number of signals goes down, the required strength of the signals goes up. We use -50dBm (S9+23dB) in the shop to check out LP-PANs before shipping. WBIR takes about 10 seconds to find an initial null at this level. The image drops to about -130dBm. If you set your overall gain so that you get a -73dBm blip with the K3 preamp OFF, that would give you about -62dBm with the preamp ON. You can get the extra gain by changing the gain setting resistor on the Z10000, or increasing the sound card gain. If your K3 does not have the buffer mod, that would be a good idea to add as well.
73, Larry N8LP On 11/15/2011 11:01 PM, elecraft-requ...@mailman.qth.net wrote: > Date: Tue, 15 Nov 2011 13:21:24 -0600 > From: "Richard Fjeld"<rpfj...@embarqmail.com> > Subject: [Elecraft] SDR-IF and I/Q questions > To: "elecraft posting"<elecraft@mailman.qth.net> > Message-ID:<423B456D46A04B79A8646FDD9820B2B2@BIOSTAR> > Content-Type: text/plain; charset="Windows-1252" > > Larry, > Thank you for the suggestion. That could be possible. I'd hate to remove the > Z10,000 > Buffer/Amp to change out a SMD component, but that may be what I will have to > do. > My Z10,000 is set for 0 dB gain at present. I just e-mailed the Google > PSDR-IF group > a question about an observation I have made. It may be totally in the wrong > pew, but > you may want to look for it. And, it may reveal something I am doing wrong. > > Thanks, > > Dick, n0ce ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
