Re: [Elecraft] odds and ends...
Hi Don. I just received the digest version of your post. I don't recall ever having said that a 48kHz sampling rate will produce a 96kHz display span. All my postings and web site info states that the span will be roughly equal to the sampling rate (minus a tiny amount due to the rolloff of the anti-aliasing filter in the sound card). I saw Joe's comment copied in the same digest message, and it is not correct. I'm sure it was just a slip of the fingers. The confusion comes in that the displayed span is roughly equal to twice the sound card bandwidth... not twice the sound card sampling rate. The bandwidth of the card, of course, is roughly half the sampling rate if it is properly implemented. 73, Larry N8LP On 8/19/2012 11:51 PM, elecraft-requ...@mailman.qth.net wrote: From:elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc:elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR __ 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] odds and ends...
Note that SignalLink is also MONO! ...bc nr4c Sent from my Verizon Wireless Droid -Original message- From: Jim Rhodes jimk...@gmail.com To: Jeff Herr her...@comcast.net Cc: elecraft@mailman.qth.net Sent: Mon, Aug 20, 2012 03:16:52 GMT+00:00 Subject: Re: [Elecraft] odds and ends... Many (most?) laptop sound inputs are mono inputs and you need 2 channels for IQ work. My old Gateway laptop switches depending on what is plugged into it but my newer Samsung only does mono. Jim K0XU Sent from my Xoom tablet On Aug 19, 2012 9:53 PM, Jeff Herr her...@comcast.net wrote: Can someone explain why an external interface product, signalink, rig blaster, etc is needed between a kx3 and a laptop? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of KQ8M Sent: Sunday, August 19, 2012 7:12 PM To: d...@w3fpr.com; 'WB4JFI' Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... Not really following this thread but I must have some really bad cards from creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz either side of center and my 192KHz cards only get 192KHz total, 96KHz either side of center using my K3, LP-Pan and PowerSDR. Or with any of my SDR receivers and CWSkimmer. Or with any SDR receivers I build and test with Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will provide 384KHz of total audio bandwidth. 73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.com AR-Cluster V6 kq8m.no-ip.org User Ports: 23, 7373 with local skimmer, 7374 without local skimmer Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606 -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks
Re: [Elecraft] odds and ends...
I don't know how Chen determines input overload - whether he's seeing digital overrun in the data or measuring clipping in the audio input. I suspect you are seeing the inevitable narrow range between hum/noise on the audio output or the high noise floor of the particular sound card and the limited signal handling capability (ca. 4.5V P-P) of a single rail, 5V device. However, unless a 24 bit soundcard is using +/- 12V supplies for the analog input circuitry, there simply isn't 130 dB of usable range between the noise floor and clipping levels. A properly designed 16 bit sound card will produce in excess of 90 dB dynamic range if the designer takes care with the noise floor issues. That is sufficient to handle signals from the receiver's noise floor to S9+20 dB with- out AGC in most cases if the receiver itself linear. For signals above that level it will take some kind of AGC simply to keep levels within the linear range of the receiver's front end/mixers. 73, ... Joe, W4TV On 8/20/2012 8:58 AM, Bill Frantz wrote: Using a SignaLink USB interface, I often see cocoaModem reporting input overload from strong signals on 20 meters with the noise barely visible on the waterfall. This occurs with both the K3 and the Small Wonder Labs PSK-20 driving the system. (The Icom 706 MK2G generates a lot more noise.) I reduce the gain on the SignaLink, or with the K3 on the RF gain, but that pushes weak signals too low to decode. I am willing to accept that the SignaLink isn't a good sound card, but need evidence/alternatives. Cheers - Bill, AE6JV On 8/20/12 at 22:08, li...@subich.com (Joe Subich, W4TV) wrote: With real receivers you probably will never notice the difference in dynamic range between a 16 and 24 bit sound card. The receiver AGC - even only modest AGC - will keep the dynamic range presented to the sound card well within anything the 16 bit sound card can handle. That is *unless* the 16 bit card is poorly designed with internal noise that wastes a significant part of the 16 bit range. Even without AGC, the range between background noise (the noise floor of the demodulation process including sky noise, thermal noise in the IF, etc.) and the clipping point of the audio output can be considerably less than 90 dB in real receivers. Audio output levels tend to range from around 10 mV with no signal to just under 5V P-P (2V RMS) at best ... that's less than 50 dB. Even if one assumes the software can decode a 1 mV signal in the 10 mV nose floor, the resulting dynamic range is still much less than 90 dB provided by a properly designed 16 bit sound card and unless the 24 bit soundcard uses other than the typical 5V power supply, its real performance will be limited by the same 5V P-P audio levels! Taken a step further - if the receiver produces a 1 mV noise floor with 24V P-P output (+/- 12V supplies), that's *still* less than 90 dB of range. --- Bill Frantz| If the site is supported by | Periwinkle (408)356-8506 | ads, you are the product.| 16345 Englewood Ave www.pwpconsult.com | | Los Gatos, CA 95032 __ 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] odds and ends...
Is signalink mono? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill Frantz Sent: Monday, August 20, 2012 5:58 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... Using a SignaLink USB interface, I often see cocoaModem reporting input overload from strong signals on 20 meters with the noise barely visible on the waterfall. This occurs with both the K3 and the Small Wonder Labs PSK-20 driving the system. (The Icom 706 MK2G generates a lot more noise.) I reduce the gain on the SignaLink, or with the K3 on the RF gain, but that pushes weak signals too low to decode. I am willing to accept that the SignaLink isn't a good sound card, but need evidence/alternatives. Cheers - Bill, AE6JV On 8/20/12 at 22:08, li...@subich.com (Joe Subich, W4TV) wrote: With real receivers you probably will never notice the difference in dynamic range between a 16 and 24 bit sound card. The receiver AGC - even only modest AGC - will keep the dynamic range presented to the sound card well within anything the 16 bit sound card can handle. That is *unless* the 16 bit card is poorly designed with internal noise that wastes a significant part of the 16 bit range. Even without AGC, the range between background noise (the noise floor of the demodulation process including sky noise, thermal noise in the IF, etc.) and the clipping point of the audio output can be considerably less than 90 dB in real receivers. Audio output levels tend to range from around 10 mV with no signal to just under 5V P-P (2V RMS) at best ... that's less than 50 dB. Even if one assumes the software can decode a 1 mV signal in the 10 mV nose floor, the resulting dynamic range is still much less than 90 dB provided by a properly designed 16 bit sound card and unless the 24 bit soundcard uses other than the typical 5V power supply, its real performance will be limited by the same 5V P-P audio levels! Taken a step further - if the receiver produces a 1 mV noise floor with 24V P-P output (+/- 12V supplies), that's *still* less than 90 dB of range. --- Bill Frantz| If the site is supported by | Periwinkle (408)356-8506 | ads, you are the product.| 16345 Englewood Ave www.pwpconsult.com | | Los Gatos, CA 95032 __ 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] odds and ends...
Yes, the SignalLink USB is a mono sounbd card with other features, a very nice, reasonably quiet mono soundcard. ...bill nr4c On Tue, 21 Aug 2012 05:53:47 -0700, Jeff Herr wrote: Is signalink mono? __ 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] odds and ends...
Hi Don. I posted a response to your post yesterday, but apparently it didn't get posted to the list. Here is another attempt using Nabble. Copy of message follows... Hi Don. I just received the digest version of your post. I don't recall ever having said that a 48kHz sampling rate will produce a 96kHz display span. All my postings and web site info states that the span will be roughly equal to the sampling rate (minus a tiny amount due to the rolloff of the anti-aliasing filter in the sound card). I saw Joe's comment copied in the same digest message, and it is not correct. I'm sure it was just a slip of the fingers. The confusion comes in that the displayed span is roughly equal to twice the sound card bandwidth... not twice the sound card sampling rate. The bandwidth of the card, of course, is roughly half the sampling rate if it is properly implemented. 73, Larry N8LP On 8/19/2012 11:51 PM, elecraft-requ...@mailman.qth.net wrote: From:elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc:elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR -- View this message in context: http://elecraft.365791.n2.nabble.com/odds-and-ends-tp7561297p7561391.html Sent from the Elecraft mailing list archive at Nabble.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] odds and ends...
Using a SignaLink USB interface, I often see cocoaModem reporting input overload from strong signals on 20 meters with the noise barely visible on the waterfall. This occurs with both the K3 and the Small Wonder Labs PSK-20 driving the system. (The Icom 706 MK2G generates a lot more noise.) I reduce the gain on the SignaLink, or with the K3 on the RF gain, but that pushes weak signals too low to decode. I am willing to accept that the SignaLink isn't a good sound card, but need evidence/alternatives. Cheers - Bill, AE6JV On 8/20/12 at 22:08, li...@subich.com (Joe Subich, W4TV) wrote: With real receivers you probably will never notice the difference in dynamic range between a 16 and 24 bit sound card. The receiver AGC - even only modest AGC - will keep the dynamic range presented to the sound card well within anything the 16 bit sound card can handle. That is *unless* the 16 bit card is poorly designed with internal noise that wastes a significant part of the 16 bit range. Even without AGC, the range between background noise (the noise floor of the demodulation process including sky noise, thermal noise in the IF, etc.) and the clipping point of the audio output can be considerably less than 90 dB in real receivers. Audio output levels tend to range from around 10 mV with no signal to just under 5V P-P (2V RMS) at best ... that's less than 50 dB. Even if one assumes the software can decode a 1 mV signal in the 10 mV nose floor, the resulting dynamic range is still much less than 90 dB provided by a properly designed 16 bit sound card and unless the 24 bit soundcard uses other than the typical 5V power supply, its real performance will be limited by the same 5V P-P audio levels! Taken a step further - if the receiver produces a 1 mV noise floor with 24V P-P output (+/- 12V supplies), that's *still* less than 90 dB of range. --- Bill Frantz| If the site is supported by | Periwinkle (408)356-8506 | ads, you are the product.| 16345 Englewood Ave www.pwpconsult.com | | Los Gatos, CA 95032 __ 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] odds and ends...
Hi Jeff, It depends what you want to do. I modified a RIGblaster NOMIC to provide the capability to do everything: http://www.bigskyspaces.com/w7gj/KX3.htm GL and VY 73, Lance On 8/19/2012 2:56 PM, Jeff Herr wrote: I am waiting for my KX3 as a number of you are. When I get it I want to hook it up to the laptop for wspr and other stuff. What will I need in the of cables? WW6L Jeff Herr 4636 Kelton Way Sacramento,CA 95838 916.925.6089 her...@comcast.net __ 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 -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: w...@hotmail.com Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! __ 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] odds and ends...
Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr Sent: Sunday, August 19, 2012 7:57 AM To: Elecraft@mailman.qth.net Subject: [Elecraft] odds and ends... I am waiting for my KX3 as a number of you are. When I get it I want to hook it up to the laptop for wspr and other stuff. What will I need in the of cables? WW6L Jeff Herr 4636 Kelton Way Sacramento,CA 95838 916.925.6089 her...@comcast.net __ 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] odds and ends...
Hi Lance and Jeff, I am also waiting with baited breathe for my KX3. And I just happen to have a NOMIC laying around that I am not using so I am going to do your mods. What a cool conversion and such great docs and pics. Thanks a million. 73 John NS5Z Sent from my iPad On Aug 19, 2012, at 10:15 AM, Lance Collister, W7GJ w...@q.com wrote: Hi Jeff, It depends what you want to do. I modified a RIGblaster NOMIC to provide the capability to do everything: http://www.bigskyspaces.com/w7gj/KX3.htm GL and VY 73, Lance On 8/19/2012 2:56 PM, Jeff Herr wrote: I am waiting for my KX3 as a number of you are. When I get it I want to hook it up to the laptop for wspr and other stuff. What will I need in the of cables? WW6L Jeff Herr 4636 Kelton Way Sacramento,CA 95838 916.925.6089 her...@comcast.net __ 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 -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: w...@hotmail.com Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! __ 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] odds and ends...
MNI TNX John! Sounds like you have the basic building blocks to make a full featured interface for the KX3. GL and VY 73, Lance On 8/19/2012 4:44 PM, All The Facts wrote: Hi Lance and Jeff, I am also waiting with baited breathe for my KX3. And I just happen to have a NOMIC laying around that I am not using so I am going to do your mods. What a cool conversion and such great docs and pics. Thanks a million. 73 John NS5Z Sent from my iPad On Aug 19, 2012, at 10:15 AM, Lance Collister, W7GJ w...@q.com wrote: Hi Jeff, It depends what you want to do. I modified a RIGblaster NOMIC to provide the capability to do everything: http://www.bigskyspaces.com/w7gj/KX3.htm GL and VY 73, Lance On 8/19/2012 2:56 PM, Jeff Herr wrote: I am waiting for my KX3 as a number of you are. When I get it I want to hook it up to the laptop for wspr and other stuff. What will I need in the of cables? WW6L Jeff Herr 4636 Kelton Way Sacramento,CA 95838 916.925.6089 her...@comcast.net __ 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 -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: w...@hotmail.com Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! __ 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 -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: w...@hotmail.com Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! __ 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] odds and ends...
Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? __ 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] odds and ends...
The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? __ 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] odds and ends...
Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? __ 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] odds and ends...
I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? __ 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 __ 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] odds and ends...
Not really following this thread but I must have some really bad cards from creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz either side of center and my 192KHz cards only get 192KHz total, 96KHz either side of center using my K3, LP-Pan and PowerSDR. Or with any of my SDR receivers and CWSkimmer. Or with any SDR receivers I build and test with Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will provide 384KHz of total audio bandwidth. 73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.com AR-Cluster V6 kq8m.no-ip.org User Ports: 23, 7373 with local skimmer, 7374 without local skimmer Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606 -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? __ 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] odds and ends...
Can someone explain why an external interface product, signalink, rig blaster, etc is needed between a kx3 and a laptop? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of KQ8M Sent: Sunday, August 19, 2012 7:12 PM To: d...@w3fpr.com; 'WB4JFI' Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... Not really following this thread but I must have some really bad cards from creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz either side of center and my 192KHz cards only get 192KHz total, 96KHz either side of center using my K3, LP-Pan and PowerSDR. Or with any of my SDR receivers and CWSkimmer. Or with any SDR receivers I build and test with Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will provide 384KHz of total audio bandwidth. 73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.com AR-Cluster V6 kq8m.no-ip.org User Ports: 23, 7373 with local skimmer, 7374 without local skimmer Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606 -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop
Re: [Elecraft] odds and ends...
My experience is the same as Tim's. I have an M-Audio Audiophile 2496 PCI which is 96Khz card and I get a total bandwidth of 96Khz. With my 192Khz Infrasonic Quartet PCI I get a total of 192 Khz. I use the LP-PAN with NaP3. I assumed this satisfied Nyquist since both the I and Q channels were being digitized. 73 Pete - N8TR At 10:12 PM 8/19/2012, KQ8M wrote: Not really following this thread but I must have some really bad cards from creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz either side of center and my 192KHz cards only get 192KHz total, 96KHz either side of center using my K3, LP-Pan and PowerSDR. Or with any of my SDR receivers and CWSkimmer. Or with any SDR receivers I build and test with Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will provide 384KHz of total audio bandwidth. 73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.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] odds and ends...
Many (most?) laptop sound inputs are mono inputs and you need 2 channels for IQ work. My old Gateway laptop switches depending on what is plugged into it but my newer Samsung only does mono. Jim K0XU Sent from my Xoom tablet On Aug 19, 2012 9:53 PM, Jeff Herr her...@comcast.net wrote: Can someone explain why an external interface product, signalink, rig blaster, etc is needed between a kx3 and a laptop? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of KQ8M Sent: Sunday, August 19, 2012 7:12 PM To: d...@w3fpr.com; 'WB4JFI' Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... Not really following this thread but I must have some really bad cards from creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz either side of center and my 192KHz cards only get 192KHz total, 96KHz either side of center using my K3, LP-Pan and PowerSDR. Or with any of my SDR receivers and CWSkimmer. Or with any SDR receivers I build and test with Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will provide 384KHz of total audio bandwidth. 73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.com AR-Cluster V6 kq8m.no-ip.org User Ports: 23, 7373 with local skimmer, 7374 without local skimmer Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606 -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters
Re: [Elecraft] odds and ends...
On 20/08/2012, at 11:54 AM, Don Wilhelm w3...@embarqmail.com wrote: I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. The reason is simple -- they are either misquoted, misunderstood, or mistaken. A sound card with a sample rate of 48kHz will allow cover the spectrum up to LO+/-24kHz, or 48kHz of spectrum centred around the LO. If the sound card has a sample rate of 96kHz, the panadaptor will display up to LO+/-48kHz, or 96kHz of spectrum. If the sound card has a low pass filter in the audio chain, then this limits the width further (eg. a 20kHz LPF is common in quality soundcards, so the spectrum available is limited to LO+/-20kHz, or 40kHz of spectrum, even if the sample rate would be 192kHz). 73, Matt VK2ACL __ 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] odds and ends...
From the manual Set the correct sampling rate. Use of 48 kHz sampling will result in a display of almost 48 kHz: 24 kHz above and 24 kHz below the frequency to which the KX3 is tuned. 96 kHz sampling will yield approximately +/- 48 kHz of spectrum, and 192 kHz sampling will yield a display of about +/- 96 kHz -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 6:54 PM To: WB4JFI Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need, but I am sure that they have cables and adapters that could be combined to achieve the desired result. 73, Rich VE3KI WW6L wrote: Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? __ 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
Re: [Elecraft] odds and ends...
The other reason I might want an external interface is to have a larger dynamic range into the computer. Most computers have a 16 bit A/D. With a 24 bit A/D you will have less trouble with strong signals causing overload when trying to receive weak signals. IMHO, using the computer audio I/O is a nice way to get your feet wet in digital modes. However it is like a beginning rig -- limited in performance. People who opt for an Elecraft class radio probably will want something better. Cheers - Bill, AE6JV On 8/19/12 at 20:30, her...@comcast.net (Jeff Herr) wrote: Good explanation! Thanks. Your first! My asus/realtek has full stereo ins and outs, via two 3.5 mm ports. I cant see a reason I need one.you DO need one. -Original Message- From: Bill Frantz [mailto:fra...@pwpconsult.com] Sent: Sunday, August 19, 2012 8:20 PM To: Jeff Herr Subject: Re: [Elecraft] odds and ends... With my small screen MacBook Pro, there is only one stereo audio jack on the computer. It can be configured for either input or output via a control panel, but not both, so if I want to both send and receive, an external USB audio interface is the easiest way to go. (Larger screen MacBook Pros have two jacks.) Cheers - Bill, AE6JV On 8/19/12 at 19:54, her...@comcast.net (Jeff Herr) wrote: Can someone explain why an external interface product, signalink, rig blaster, etc is needed between a kx3 and a laptop? --- Bill Frantz|Security, like correctness, is| Periwinkle (408)356-8506 |not an add-on feature. - Attr-| 16345 Englewood Ave www.pwpconsult.com |ibuted to Andrew Tanenbaum| Los Gatos, CA 95032 --- Bill Frantz|After all, if the conventional wisdom was working, the 408-356-8506 | rate of systems being compromised would be going down, www.pwpconsult.com | wouldn't it? -- Marcus Ranum __ 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] odds and ends...
Reputable companies also sell oxygen-depleted cables to audiophiles. You can't cheat mother nature, no matter how hard you try. I don't doubt that they can display whatever they want, but as to actual, significant data displayed thereon, that's a different matter. A single channel of adc samples at 48ks/s can only display VALID unique frequency data up to 24 kHz before the spectrum folds over. Since both I and Q can be used, they effectively double the sample rate, as if you were sampling at 96k. Not exactly correct, but close enough. Nyquist -who is still valid in the real world - theory says that you can only recover signals whose freq is up to one-half the sample rate. Again, I am generalizing, but close enough. So, one-half of 96k is 48k, not 96k. Factoring not involved. 48k total bandwidth before the spectrum folds over. Doesn't matter what the display says. Try it on Rocky, Powersdr, hdsdr, winrad, etc. I'm not saying that Joe or Larry are doing anything wrong, just that if your sound card (or DDC or other device) is providing I/Q samples at 48ks/s per I/Q pair, th best you can get is a total of 48k of valid, unique, and correct spectrum data points. That usually results in plus and minus 24khz being displayed around center frequency. To say that you can display 96k of unique, correct spectrum data from a 48ks/s rate I/Q pair is, well, not accurate (wrong). It's like depleting too much oxygen from your speaker cables. You end up with a hollow sound, like taking the oxygen away left too much room for the electrons to bounce around in. If you like fuzzy bass, that's ok. But, I've been wrong before. Sent from tfox iPad On Aug 19, 2012, at 9:54 PM, Don Wilhelm w3...@embarqmail.com wrote: I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was fun mind games many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: Mr Nyquist would be happily surprised at that. With IQ samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. So, with a 48k sample rate, you will get plus and minus 24k from center. Sent from tfox iPad On Aug 19, 2012, at 4:33 PM, Joe Subich, W4TV li...@subich.com wrote: The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. A sound card capable of 48 KHz sample rate can display slightly less than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. 73, ... Joe, W4TV On 8/19/2012 4:20 PM, Richard Ferch wrote: Jeff, In addition to the cable, you will also need to be sure that your laptop's sound card accepts stereo input. Panadapter software requires stereo input (I and Q channels). Some laptop input jacks will only accept mono signals, even though the laptop's sound card itself is stereo. My newest laptop, for example, has a TRRS jack for the sound card with a single input line, two stereo output lines, and ground. I have no way to get stereo input into this sound card. An older laptop I have has separate input and output jacks, but while the output jack is stereo, the input jack is mono. If your laptop is like either of these, your only recourse may be to get an external USB sound card with stereo inputs. The sound card's maximum sampling rate will determine how wide your panadapter display can be (in kHz); for example, a sound card capable of sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If you want a wider display, you will have to ensure that your sound card can sample at higher rates. Note that if you need to use an external (e.g. USB) sound card, it may or may not have 3.5mm inputs. For example, I have one with dual RCA phono jacks for its line inputs. With one of these cards, you would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA phono plugs for the sound card's input. I don't know whether Radio Shack has the specific cable you would need,
Re: [Elecraft] odds and ends...
A single channel of adc samples at 48ks/s can only display VALID unique frequency data up to 24 kHz before the spectrum folds over. Since both I and Q can be used, they effectively double the sample rate, as if you were sampling at 96k. Not exactly correct, but close enough. Correct ... I was recalling the bandwidth from the built-in sound device on one of my systems and thinking (incorrectly as it turns out) that it was sampling at 48 KHz when it actually has 96KHz drivers. 73, ... Joe, W4TV On 8/19/2012 11:51 PM, WB4JFI wrote: Reputable companies also sell oxygen-depleted cables to audiophiles. You can't cheat mother nature, no matter how hard you try. I don't doubt that they can display whatever they want, but as to actual, significant data displayed thereon, that's a different matter. A single channel of adc samples at 48ks/s can only display VALID unique frequency data up to 24 kHz before the spectrum folds over. Since both I and Q can be used, they effectively double the sample rate, as if you were sampling at 96k. Not exactly correct, but close enough. Nyquist -who is still valid in the real world - theory says that you can only recover signals whose freq is up to one-half the sample rate. Again, I am generalizing, but close enough. So, one-half of 96k is 48k, not 96k. Factoring not involved. 48k total bandwidth before the spectrum folds over. Doesn't matter what the display says. Try it on Rocky, Powersdr, hdsdr, winrad, etc. I'm not saying that Joe or Larry are doing anything wrong, just that if your sound card (or DDC or other device) is providing I/Q samples at 48ks/s per I/Q pair, th best you can get is a total of 48k of valid, unique, and correct spectrum data points. That usually results in plus and minus 24khz being displayed around center frequency. To say that you can display 96k of unique, correct spectrum data from a 48ks/s rate I/Q pair is, well, not accurate (wrong). It's like depleting too much oxygen from your speaker cables. You end up with a hollow sound, like taking the oxygen away left too much room for the electrons to bounce around in. If you like fuzzy bass, that's ok. But, I've been wrong before. Sent from tfox iPad __ 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] odds and ends...
On 8/19/2012 11:40 PM, Bill Frantz wrote: The other reason I might want an external interface is to have a larger dynamic range into the computer. Most computers have a 16 bit A/D. With a 24 bit A/D you will have less trouble with strong signals causing overload when trying to receive weak signals. With real receivers you probably will never notice the difference in dynamic range between a 16 and 24 bit sound card. The receiver AGC - even only modest AGC - will keep the dynamic range presented to the sound card well within anything the 16 bit sound card can handle. That is *unless* the 16 bit card is poorly designed with internal noise that wastes a significant part of the 16 bit range. Even without AGC, the range between background noise (the noise floor of the demodulation process including sky noise, thermal noise in the IF, etc.) and the clipping point of the audio output can be considerably less than 90 dB in real receivers. Audio output levels tend to range from around 10 mV with no signal to just under 5V P-P (2V RMS) at best ... that's less than 50 dB. Even if one assumes the software can decode a 1 mV signal in the 10 mV nose floor, the resulting dynamic range is still much less than 90 dB provided by a properly designed 16 bit sound card and unless the 24 bit soundcard uses other than the typical 5V power supply, its real performance will be limited by the same 5V P-P audio levels! Taken a step further - if the receiver produces a 1 mV noise floor with 24V P-P output (+/- 12V supplies), that's *still* less than 90 dB of range. 73, ... Joe, W4TV On 8/19/2012 11:40 PM, Bill Frantz wrote: The other reason I might want an external interface is to have a larger dynamic range into the computer. Most computers have a 16 bit A/D. With a 24 bit A/D you will have less trouble with strong signals causing overload when trying to receive weak signals. IMHO, using the computer audio I/O is a nice way to get your feet wet in digital modes. However it is like a beginning rig -- limited in performance. People who opt for an Elecraft class radio probably will want something better. Cheers - Bill, AE6JV __ 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] odds and ends...
According to previous posts from wayne, elecraft is in the process of putting a set of cables together to be sold on the site. I have no idea which type of cables etc. But that would make life easier for some people a 'kosher ham' Robert -Original Message- From: Jeff Herr her...@comcast.net Sender: elecraft-boun...@mailman.qth.net Date: Sun, 19 Aug 2012 09:11:41 To: 'Jeff Herr'her...@comcast.net; Elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr Sent: Sunday, August 19, 2012 7:57 AM To: Elecraft@mailman.qth.net Subject: [Elecraft] odds and ends... I am waiting for my KX3 as a number of you are. When I get it I want to hook it up to the laptop for wspr and other stuff. What will I need in the of cables? WW6L Jeff Herr 4636 Kelton Way Sacramento,CA 95838 916.925.6089 her...@comcast.net __ 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] odds and ends...
Looking forward to that. Accessories and cables and any ancillaries for the KX3. Looking forward to their launch. Keith AG6AZ Sent from my iPhone please excuse typos On Aug 19, 2012, at 10:13 PM, va3...@gmail.com wrote: According to previous posts from wayne, elecraft is in the process of putting a set of cables together to be sold on the site. I have no idea which type of cables etc. But that would make life easier for some people a 'kosher ham' Robert -Original Message- From: Jeff Herr her...@comcast.net Sender: elecraft-boun...@mailman.qth.net Date: Sun, 19 Aug 2012 09:11:41 To: 'Jeff Herr'her...@comcast.net; Elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... Per the manual Iit looks like I would need one of these A cable with a 2.5 mm (3/32) plug on one end and a plug that matches your sound card input on the other end (typically 3.5 mm [1/8] stereo) is required. If I want to see a panadapter display on my laptop. Where do I get it? -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr Sent: Sunday, August 19, 2012 7:57 AM To: Elecraft@mailman.qth.net Subject: [Elecraft] odds and ends... I am waiting for my KX3 as a number of you are. When I get it I want to hook it up to the laptop for wspr and other stuff. What will I need in the of cables? WW6L Jeff Herr 4636 Kelton Way Sacramento,CA 95838 916.925.6089 her...@comcast.net __ 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 __ 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] odds and ends...
On 8/19/2012 7:54 PM, Jeff Herr wrote: Can someone explain why an external interface product, signalink, rig blaster, etc is needed between a kx3 and a laptop? It depends entirely on WHAT you want to accomplish with your laptop, and HOW GOOD you want it to be. Others have covered the spectrum display issues, so I won't repeat that. Another thing we do on a computer, laptop or otherwise, is generate and decode digital signals. In general, the generic sound cards built into computers aren't that wonderful, and a DECENT sound card will have much better A/D linearity at the lower end of its dynamic range, as well as less analog audio distortion. The result is usually greatly improve the decoding of digital signals. In careful testing, I found that, on average, even a carefully selected el-cheapo USB sound card DOUBLED the number of JT65A decodes that I got on each pass compared to the stock sound card, and let me copy signals much deeper into the noise. I also saw improved performance on RTTY. I recommend the low cost Numark and the low cost Tascam, about $30 and $70 respectively at BH Photo. Both decode equally well, but the Tascam is more adjustable and flexible to accept a wider range of input and output levels. 73, Jim K9YC __ 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
