[Elecraft] XG3 Arrived
Wayne, I connected the XG3 directly to my sub-Rx via the aux ant and the signal is a clean CW note. I did a quick calibration check at 14.020 with -73 dBm and s-meter reads S-8 so pretty good (uncalibrated since I got the radio a year ago). I did another test transmitting 0dBm thru the air and can see that it is 60-Hz hum from something (I hear the CW note in there). I checked for ripple on my bench PS and see nothing at .005 with the scope. It ran for about half an hour with no detectable drift in the tone frequency. That is impressive considering the K3 has the K3EXREF. I wanted to report back so that my earlier report was not seen as a negative about the XG3. BTW be careful switching to -33 dBm into the K3 it really clears out the dust in the speaker. Running -107 dBm shows S-2 (36 dB less than S8). That really shows off the linearity and accuracy of the K3 s-meter. I set up all the recommended settings for receiver sensitivity measurement. Later I will connect my Sinader meter to do a S+N/N measurement on 28-MHz (my freq of interest as IF for 2m and 1296 transverters). Be interesting to compare with the internal audio meter in the K3. I will also compare the XG3 with my 1296 signal source. XG3: very nice! Ed - KL7UW -- Message: 44 Date: Wed, 20 Apr 2011 17:30:30 -0700 From: Wayne Burdick n...@elecraft.com Subject: Re: [Elecraft] XG3 Arrived To: Edward R. Cole kl...@acsalaska.net Cc: Elecraft@mailman.qth.net Message-ID: d0bf60d3-720d-43af-8fd2-28c224300...@elecraft.com Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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 Arrived
As soon as you filter out the harmonics - which the receiver does very well - you have a sine wave. Ron AC7AC -Original Message- Wayne, Wouldn't you hear it on a radio in CW mode? The tone is added in receiver, so hearing tone means hearing pure carrier. Last I knew CW is the pure carrier. 73, Igor, N1YX -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick Sent: Wednesday, April 20, 2011 8:31 PM To: Edward R. Cole Cc: Elecraft@mailman.qth.net Subject: Re: [Elecraft] XG3 Arrived Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR On Apr 20, 2011, at 5:20 PM, Edward R. Cole wrote: __ 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 Arrived
The XG3 is not generating the 60 Hz hum you are hearing if it is running off its battery. On its fundamental freq and harmonics, the radio will hear it as an unmodulated carrier. It is common to hear 60 Hz hum when listening to another transmitter in the same room, typically due to RF coupling to the mains power lines. Also if you are powering the XG3 off of an external supply, you may have a 60 Hz ground loop between it and the radio. 73, Eric WA6HHQ On 4/21/2011 12:03 AM, Edward R. Cole wrote: Wayne, I connected the XG3 directly to my sub-Rx via the aux ant and the signal is a clean CW note. I did a quick calibration check at 14.020 with -73 dBm and s-meter reads S-8 so pretty good (uncalibrated since I got the radio a year ago). I did another test transmitting 0dBm thru the air and can see that it is 60-Hz hum from something (I hear the CW note in there). I checked for ripple on my bench PS and see nothing at .005 with the scope. It ran for about half an hour with no detectable drift in the tone frequency. That is impressive considering the K3 has the K3EXREF. I wanted to report back so that my earlier report was not seen as a negative about the XG3. BTW be careful switching to -33 dBm into the K3 it really clears out the dust in the speaker. Running -107 dBm shows S-2 (36 dB less than S8). That really shows off the linearity and accuracy of the K3 s-meter. I set up all the recommended settings for receiver sensitivity measurement. Later I will connect my Sinader meter to do a S+N/N measurement on 28-MHz (my freq of interest as IF for 2m and 1296 transverters). Be interesting to compare with the internal audio meter in the K3. I will also compare the XG3 with my 1296 signal source. XG3: very nice! Ed - KL7UW -- Message: 44 Date: Wed, 20 Apr 2011 17:30:30 -0700 From: Wayne Burdickn...@elecraft.com Subject: Re: [Elecraft] XG3 Arrived To: Edward R. Colekl...@acsalaska.net Cc: Elecraft@mailman.qth.net Message-ID:d0bf60d3-720d-43af-8fd2-28c224300...@elecraft.com Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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 Arrived
Most power supplies lose a lot of their filtering under very light loads. If he's hearing a buzz, it's likely from amplitude modulation of the signal from what for an extremely light load would be a noisy power supply. The way to tell is to see if it goes away running it from a 9 volt battery. 73, Guy On Thu, Apr 21, 2011 at 11:15 AM, Ron D'Eau Claire r...@cobi.biz wrote: As soon as you filter out the harmonics - which the receiver does very well - you have a sine wave. Ron AC7AC -Original Message- Wayne, Wouldn't you hear it on a radio in CW mode? The tone is added in receiver, so hearing tone means hearing pure carrier. Last I knew CW is the pure carrier. 73, Igor, N1YX -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick Sent: Wednesday, April 20, 2011 8:31 PM To: Edward R. Cole Cc: Elecraft@mailman.qth.net Subject: Re: [Elecraft] XG3 Arrived Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR On Apr 20, 2011, at 5:20 PM, Edward R. Cole wrote: __ 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 Arrived
Do you have the buzz running off a 9 V battery? Given the mechanics of AM modulation, your power supply would need to have ripple in the microvolt range for the XG3 to be rid of hum at the higher outputs. The space constraints would make stiff inside-the-XG3 power supply filtering very difficult. My other question would be whether the buzz does anything at all to accuracy. 73, Guy. On Thu, Apr 21, 2011 at 3:03 AM, Edward R. Cole kl...@acsalaska.net wrote: Wayne, I connected the XG3 directly to my sub-Rx via the aux ant and the signal is a clean CW note. I did a quick calibration check at 14.020 with -73 dBm and s-meter reads S-8 so pretty good (uncalibrated since I got the radio a year ago). I did another test transmitting 0dBm thru the air and can see that it is 60-Hz hum from something (I hear the CW note in there). I checked for ripple on my bench PS and see nothing at .005 with the scope. It ran for about half an hour with no detectable drift in the tone frequency. That is impressive considering the K3 has the K3EXREF. I wanted to report back so that my earlier report was not seen as a negative about the XG3. BTW be careful switching to -33 dBm into the K3 it really clears out the dust in the speaker. Running -107 dBm shows S-2 (36 dB less than S8). That really shows off the linearity and accuracy of the K3 s-meter. I set up all the recommended settings for receiver sensitivity measurement. Later I will connect my Sinader meter to do a S+N/N measurement on 28-MHz (my freq of interest as IF for 2m and 1296 transverters). Be interesting to compare with the internal audio meter in the K3. I will also compare the XG3 with my 1296 signal source. XG3: very nice! Ed - KL7UW -- Message: 44 Date: Wed, 20 Apr 2011 17:30:30 -0700 From: Wayne Burdick n...@elecraft.com Subject: Re: [Elecraft] XG3 Arrived To: Edward R. Cole kl...@acsalaska.net Cc: Elecraft@mailman.qth.net Message-ID: d0bf60d3-720d-43af-8fd2-28c224300...@elecraft.com Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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 Arrived
I bought a 9volt battery for the XG3, today. Running at 0 dBm on 14.020 it puts out a nice clear CW note reading about S7-8 with the XG3 sitting about a foot from the K3. I have a 2m rubber duckie as antenna on the XG3 and the triband beam 50-feet above the shack on the K3. I lowered output to -33 dBm and still have a CW note though now about S1 and hearing a little ac noise coming thru the K3. I switched to 28.020 and clean signal at either 0 dBm or -33 dBm; switched to 144.220 and good signal there, also. So I guess I hear some ac on 20m. It has nothing to do with the XG3 - End of subject! BTW the signal is just as stable and on frequency at 2m as on 20m. I have had other xtal signal sources that drifted many KHz constantly for the first 30-min to an hour of use. I hear NO drift! wow! There was a little freq. offset at 28.020 but I can always do the calibration if I really care. Frequency accuracy is fine as it is. Note this is with the K3 equipped with the K3EXREF so it is within 2-Hz accuracy. Out of interest I connected the XG3 to my EIP-538 freq. counter and it shows 1.819.997 MHz +/- 2 Hz; 20.020.014 +/- 5 Hz; 144.220.250 +/- 20 Hz. This counter has an internal TCXO that shows no error with my Rubidium standard. I bought it for receiver sensitivity measurements and filter tuning, and the stability is more than adequate for that. I haven't played with the XG3 utility but now that my CoilCraft 7-pole LP filters and filter boards from Clifton Labs have arrived I will try making some response curves, scanning with the XG3. I am making up four LP filters for use on the workbench (and with the XG3 when I want to eliminate harmonics). The filters were free engineering samples. I will show the results on my website. 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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] XG3 Arrived
My XG3 came in the mail, today. Haven't played with it very much but did connect it to +13v and set it on 14.020 at 0dBm into a 2m rubber duckie (nice match - I know) and there is enough signal to hear it. Note is not that of a sine wave but the buzz-hum of a square wave. Certainly fine for testing. I will have to pick up some 9v batteries for it. Cute little guy! Very handy to take anywhere. I have on order 7-pole Low Pass filters from CoilCraft which I am hoping will filter out harmonics producing a sine wave. The filters and boards are expected after Friday (also by mail). 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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 Arrived
Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR On Apr 20, 2011, at 5:20 PM, Edward R. Cole wrote: My XG3 came in the mail, today. Haven't played with it very much but did connect it to +13v and set it on 14.020 at 0dBm into a 2m rubber duckie (nice match - I know) and there is enough signal to hear it. Note is not that of a sine wave but the buzz-hum of a square wave. Certainly fine for testing. I will have to pick up some 9v batteries for it. Cute little guy! Very handy to take anywhere. I have on order 7-pole Low Pass filters from CoilCraft which I am hoping will filter out harmonics producing a sine wave. The filters and boards are expected after Friday (also by mail). 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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 Arrived
Wayne, Wouldn't you hear it on a radio in CW mode? The tone is added in receiver, so hearing tone means hearing pure carrier. Last I knew CW is the pure carrier. 73, Igor, N1YX -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick Sent: Wednesday, April 20, 2011 8:31 PM To: Edward R. Cole Cc: Elecraft@mailman.qth.net Subject: Re: [Elecraft] XG3 Arrived Ed, You should not hear a hum or buzz when listening to the XG3 on a receiver. The fact that's it's not a sinewave doesn't mean that it has audio-frequency modulation; it is a pure carrier. You might be hearing 60-Hz pickup due to the lack of a common ground, etc. Wayne N6KR On Apr 20, 2011, at 5:20 PM, Edward R. Cole wrote: My XG3 came in the mail, today. Haven't played with it very much but did connect it to +13v and set it on 14.020 at 0dBm into a 2m rubber duckie (nice match - I know) and there is enough signal to hear it. Note is not that of a sine wave but the buzz-hum of a square wave. Certainly fine for testing. I will have to pick up some 9v batteries for it. Cute little guy! Very handy to take anywhere. I have on order 7-pole Low Pass filters from CoilCraft which I am hoping will filter out harmonics producing a sine wave. The filters and boards are expected after Friday (also by mail). 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == __ 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
