Re: [Elecraft] XG3 All-Band RF Signal Source/phase noise performance?
Someone asked about using the XG3 to measure the skirt attenuation of a crystal filter. If the phase noise is -105 dBc / Hz, then with a 500 Hz crystal filter the filter skirts will disappear into the noise at about -105 + 10 * log(500) = -78 dB. With a 2.7 kHz filter, it works out to -71 dB. Alan N1AL On Wed, 2011-04-13 at 18:51 -0700, Wayne Burdick wrote: > Hi John, > > Phase noise is specified in the manual. It is a relatively constant > -105 dBc/Hz, even at very close spacings, which is excellent > performance for a low-cost, wide-range signal source. > > I wouldn't amplify it to 1KW. > > Let me know how it works for you as a replacement for the HP8640. Not > as many knobs and switches, but it runs from a 9-V battery. > > 73, > Wayne > N6KR > > > On Apr 13, 2011, at 6:46 PM, juergen wrote: > > > Hi > > > > No phase noise performance data in the manual. What is the phase > > noise performance of the XG3 like? > > > > My HP8640 is being held together by a miracles and prayers, I need a > > replacement. > > > > 73 > > John > > __ > 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 > __ 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
Re: [Elecraft] XG3 All-Band RF Signal Source/phase noise performance?
John, Sorry to hear that your 8640 is nearing its end. My recommendation (and my personal preference) - hang onto the HP8640 for as long as it works - in the available signal generator field, it cannot be beat for low phase noise along with a well calibrated output attenuator. Sure it takes a couple hours for it to stop drifting, but the other factors make it a very worthwhile tool for the workbench. I now have 2 HP8640's, but I have ordered the XG3 because it is convenient and will be the "workhorse" of the workbench signal generators. But when it comes down to applications that require no leakage, and well calibrated output levels down to -140 dBm (and below with in-line attenuators), you can bet that the old '8640 will be my generator of choice. The XG3 will be replacing my XG1 and XG2, but the HP8640 will stay at the bench for those times when nothing else will do as well. 73, Don W3FPR On 4/13/2011 9:46 PM, juergen wrote: > Hi > > No phase noise performance data in the manual. What is the phase noise > performance of the XG3 like? > > My HP8640 is being held together by a miracles and prayers, I need a > replacement. > > 73 > John > > --- On Wed, 4/13/11, Wayne Burdick wrote: > >> From: Wayne Burdick >> Subject: Re: [Elecraft] New Elecraft product: XG3 All-Band RF Signal Source >> To: "Rick Dettinger" >> Cc: "Elecraft Elecraft", >> "QRP-L", elecr...@yahoogroups.com >> Date: Wednesday, April 13, 2011, 2:36 PM >> Rick Dettinger wrote: >> >>> 0 dbm. OK, how do I key this QRP >> transmitter >> >> You could key it from a PC with a couple of RS232 commands, >> although >> the keying won't be shaped unless you do it externally. >> >> As far as I know, no one on our staff has made a QSO on an >> XG3 yet. >> But keep in mind that 0 dBm is only 30 dB below 1 watt. So >> if your 1-W >> QRP rig is S9 at the receiving end, the XG3 would be about >> S3. >> >> Suitable antenna design is left to the reader. >> >> 73, >> Wayne >> N6KR >> >> >> __ >> 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 >> > > > __ > 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 > __ 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
Re: [Elecraft] XG3 All-Band RF Signal Source/phase noise performance?
Hi John, Phase noise is specified in the manual. It is a relatively constant -105 dBc/Hz, even at very close spacings, which is excellent performance for a low-cost, wide-range signal source. I wouldn't amplify it to 1KW. Let me know how it works for you as a replacement for the HP8640. Not as many knobs and switches, but it runs from a 9-V battery. 73, Wayne N6KR On Apr 13, 2011, at 6:46 PM, juergen wrote: > Hi > > No phase noise performance data in the manual. What is the phase > noise performance of the XG3 like? > > My HP8640 is being held together by a miracles and prayers, I need a > replacement. > > 73 > John __ 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
Re: [Elecraft] XG3 All-Band RF Signal Source/phase noise performance?
Hi No phase noise performance data in the manual. What is the phase noise performance of the XG3 like? My HP8640 is being held together by a miracles and prayers, I need a replacement. 73 John --- On Wed, 4/13/11, Wayne Burdick wrote: > From: Wayne Burdick > Subject: Re: [Elecraft] New Elecraft product: XG3 All-Band RF Signal Source > To: "Rick Dettinger" > Cc: "Elecraft Elecraft" , "QRP-L" > , elecr...@yahoogroups.com > Date: Wednesday, April 13, 2011, 2:36 PM > Rick Dettinger wrote: > > > 0 dbm. OK, how do I key this QRP > transmitter > > You could key it from a PC with a couple of RS232 commands, > although > the keying won't be shaped unless you do it externally. > > As far as I know, no one on our staff has made a QSO on an > XG3 yet. > But keep in mind that 0 dBm is only 30 dB below 1 watt. So > if your 1-W > QRP rig is S9 at the receiving end, the XG3 would be about > S3. > > Suitable antenna design is left to the reader. > > 73, > Wayne > N6KR > > > __ > 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 > __ 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
