Tim Ellison wrote: > Eric said: > No typo here. It is useful to have a stronger signal than -73dBm when > doing the image calibration. > > So anyone have a good recommendation for a stable signal generator that > won't break the bank? > > -Tim > --- > Integrated Technical Services > > "Too much of everything is just enough." > -Rob Barlow > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Eric Wachsmann > Sent: Thursday, September 14, 2006 2:44 PM > To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; > flexradio@flex-radio.biz > Subject: Re: [Flexradio] Image Null Calibration. > > No typo here. It is useful to have a stronger signal than -73dBm when > doing the image calibration. Considering that the noise floor is going > to be around -130dBm, this only gives you a range of about 60dB for a > best case null (because it becomes difficult to null below the noise > floor). Using a stronger input signal gives a larger image and thus the > calibration can more effectively null the signal further (typically all > the way into the noise floor). > > > Eric Wachsmann > FlexRadio Systems > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > >> radio.biz] On Behalf Of [EMAIL PROTECTED] >> Sent: Thursday, September 14, 2006 1:38 PM >> To: [EMAIL PROTECTED]; flexradio@flex-radio.biz >> Subject: Re: [Flexradio] Image Null Calibration. >> >> I'm guessing this is a typo and possibly was meant to say 50uV of >> which the XG-1/XG-2 is capable (i.e. -73dBm, as you state). I've used > >> my XG-1 to do this calibration and had assumed the signal level (at >> S9) was adequate. What say, Eric? >> >> Pete, N3EVL >> >> >>> -----Original Message----- >>> From: [EMAIL PROTECTED] >>> [mailto:[EMAIL PROTECTED] On Behalf Of Van de Velde >>> Eddy >>> Sent: Thursday, September 14, 2006 1:49 PM >>> To: flexradio@flex-radio.biz >>> Subject: [Flexradio] Image Null Calibration. >>> >>> The maximum output of the Elacraft XG-2 is -73 dBm. The manual of >>> the SDR-1000 requests a signal of -50 dBm for the Automatic >>> calibration of the Image Null. >>> >>> Is the -73 dBm of the XG-2 insufficient for a reliable I mage Null >>> Calibration ? >>> >>> 73 Eddy ON5UQ. >>> -------------- next part -------------- An HTML attachment was >>
Use your XG-1 for frequency calibration, but use a transmitter into a dummy load for image rejection calibration. -- Cecil KD5NWA www.qrpradio.com www.hpsdr.com "Sacred Cows make the best Hamburger!" Don Seglio Batuna _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
