Hi Ken, Now I'm confused. Must have something calibrated wrong or a bad 1K.
My SDR1K is sitting on 7.010. Nothing but noise. Keeping AGC-T constant: with Preamp Off the noise level reads -105dBm peak. Now if I put the Preamp on Low the noise level jumps to -94dBm and when I put the Preamp on Med the noise level jumps to -88dBm. Finally putting the preamp on High the noise level jumps to -80dBm. To me that's what I would expect from a preamp. In fact first time I saw it, I said to myself "now that's the way a preamp should work!" I get Preamp = High and Noise Highest. Preamp Off = Noise lowest. Same thing looking directly at the ADC's. Near as my feeble brain can tell this is just the opposite of what you guys are describing. Real life signals are still floating on top of the noise. >From reading the Op manual V1.8 page 35, Level Calibration -- Spectrum & S-Meter, it doesn't sound any different. It's a user selected level and frequency but gotta be well out of the noise. Granted it doesn't say to set the preamp to a given level, but on the other hand PowerSDR knows the setting. So please help, what are you guys talking about? vy 73's Rob AB7CF On Thu, 24 Jan 2008 16:48:57 -0600 Ken N9VV <[EMAIL PROTECTED]> writes: > The idea is to have your S9 signal generator (Elecraft XG-1 > for example) show *exactly the same peak reading* no matter > how you set the PREAMP. It is a beautiful software defined > radio design concept - now implemented by Flex in the > PowerSDR software. > > GL de Ken N9VV > > Edwin Marzan wrote: > > Do you mean the rise and fall of the noise level on the > panadaptor? > If so, this has always been the case with my SDR1000. I > receive the > highest noise level reading with the preamp off and the > lowest noise > level with the preamp on. It sounds backwards but I do notice an > increase in the signals against the noise with the preamp > on.Edwin > MarzanAB2VW > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > > > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
