[Flexradio] SDR1000 FS
SDR1000 for sale. About 2 months old. Used for about an hour. Comes with Delta44 sound card and cables, $1295 shipped. Please reply direct, off list. John N1JM
Re: [Flexradio] SDR1000 Frequency correction
At 05:51 PM 1/30/2006, [EMAIL PROTECTED] wrote: Bill KD5TFD and I are working on a project to correct the initial frequency error and temperature drift of the 200MHz VF oscillator in the SDR1000. To do so we need to tap off some of the 200MHz signal and feed it to another circuit board. My suggestion is to make a small PCB daughter board that the 200MHz oscillator plugs into and that in turn plugs into the existing mounting holes. I think you won't have clearance. I'd go with the oscillator dongle approach as you describe below. It also lends itself to other good ideas, like thermal isolation of the oscillator, etc. You'll need to figure out some details on how to send the signal back to the board in an optimal fashion. (i.e. you don't want noise pickup or the line driver to add jitter) Jim.
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
Could you use standard USB cables with a type A connector on the end where you have room and a type mini-B on the end where you don't? USB is a single differential twisted pair with additional gnd and Vbuss wires rated to 420 Mbits/second. Be sure it's protected if someone accidentally plugs in a real USB at either end. Chris - AE6VK From: Phil Harman [mailto:[EMAIL PROTECTED] Sent: Sunday, January 29, 2006 12:31 AMTo: FlexRadio@flex-radio.biz; Xylo-SDR DiscussionSubject: [Xylo-SDR] Proof-of-concept successful! This weekend Bill, KD5TFD, completed his integration of our Wolfson A/D + Xylo FPGA + USB interface into PowerSDR. This proof-of-concepth has been completely successful and we are eagerly pushing forward to the next phase of the project. The screen shot below is of our 48k 16 bit full duplex sound card running in PowerSDR using an SDR1000 on 20m http://www.hamsdr.com/dnld.aspx?id=126 The noise floor of the Wolfson A/D in this configuration is -140dBm in a 500z bandwidth. The next steps are to increase the sampling rate to 192kHz and 24 bits. Bill is also going to implement his system to overcome the frequency error and drift of the 200MHz Valpey Fisher oscillator. He is using a GPS 1Hzor 10kHz clock to measure the frequency of the DDS output and pass this back over the same USB signal that carries the digital audio. A software routine in PowerSDR will then compare the actual DDS frequency to the desired frequency and make the necessary correction in software. If this works OK then he will look at counting the 200MHz oscillator directly, although picking this off the SDR1000 hardware is bit more involved than the DDS outputhence the reasonfor starting with the DDS output. We are looking at deriving an LVDS signal from the 200MHz oscillator and if anyone has any suggestions as to suitable connectors to use with a single LVDS signal then we would appreciate the information. There is still plenty of room for more C++ and FPGA developers if you are interested in assisting with the project - those willing to lay out PCB's will be especially welcome! 73's Phil Vk6APH
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
On further investigation, I discover that there is also a mini-A style connector. The mini-A and mini-B connectors are for things like cellphones and PDAs, so are pretty small. Chris - AE6VK From: Christopher T. Day Sent: Tuesday, January 31, 2006 9:30 AMTo: Xylo-SDR Discussion; FlexRadio@flex-radio.bizSubject: Re: [Xylo-SDR] Proof-of-concept successful! Could you use standard USB cables with a type A connector on the end where you have room and a type mini-B on the end where you don't? USB is a single differential twisted pair with additional gnd and Vbuss wires rated to 420 Mbits/second. Be sure it's protected if someone accidentally plugs in a real USB at either end. Chris - AE6VK From: Phil Harman [mailto:[EMAIL PROTECTED] Sent: Sunday, January 29, 2006 12:31 AMTo: FlexRadio@flex-radio.biz; Xylo-SDR DiscussionSubject: [Xylo-SDR] Proof-of-concept successful! This weekend Bill, KD5TFD, completed his integration of our Wolfson A/D + Xylo FPGA + USB interface into PowerSDR. This proof-of-concepth has been completely successful and we are eagerly pushing forward to the next phase of the project. The screen shot below is of our 48k 16 bit full duplex sound card running in PowerSDR using an SDR1000 on 20m http://www.hamsdr.com/dnld.aspx?id=126 The noise floor of the Wolfson A/D in this configuration is -140dBm in a 500z bandwidth. The next steps are to increase the sampling rate to 192kHz and 24 bits. Bill is also going to implement his system to overcome the frequency error and drift of the 200MHz Valpey Fisher oscillator. He is using a GPS 1Hzor 10kHz clock to measure the frequency of the DDS output and pass this back over the same USB signal that carries the digital audio. A software routine in PowerSDR will then compare the actual DDS frequency to the desired frequency and make the necessary correction in software. If this works OK then he will look at counting the 200MHz oscillator directly, although picking this off the SDR1000 hardware is bit more involved than the DDS outputhence the reasonfor starting with the DDS output. We are looking at deriving an LVDS signal from the 200MHz oscillator and if anyone has any suggestions as to suitable connectors to use with a single LVDS signal then we would appreciate the information. There is still plenty of room for more C++ and FPGA developers if you are interested in assisting with the project - those willing to lay out PCB's will be especially welcome! 73's Phil Vk6APH
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
At 09:39 AM 1/31/2006, Christopher T. Day wrote: Content-type: multipart/alternative; boundary=Boundary_(ID_myHo0fB6jvmDFK+20g7fhQ) Content-class: urn:content-classes:message On further investigation, I discover that there is also a mini-A style connector. The mini-A and mini-B connectors are for things like cellphones and PDAs, so are pretty small. Excellent idea...
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
Chapter 7 of the USB 2 spec has this information in great detail. Twited pair cable impedence is nominal 90 ohms. Given the popularity of USB, surely here must be driver chips id LVDS can't do it directly. Chris - AE6VK From: KD5NWA [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 31, 2006 9:54 AMTo: Flex RadioCc: Xylo-SDR DiscussionSubject: Re: [Xylo-SDR] [Flexradio] Proof-of-concept successful! LVDS is made for a tightly twisted pair with 100 Ohm impedance, a pair in a CAT5e cable is exactly what is meant to be used with. Does anyone know what the characteristic impedance of a USB cable is? If not, then it's best to stay away from anything unknown.It's a transmission line from the transmitter to the receiver and should be treated as such including impedance matching so you do not get reflections, shortcuts will lead to phase noise.As far as a connector, a CAT5e RJ45 connector is meant for that impedance, and does an excellent job.At 11:30 AM 1/31/2006, Christopher T. Day wrote: Content-Type: multipart/alternative; boundary="_=_NextPart_001_01C6268C.0101442A"Content-Class: urn:content-classes:messageCould you use standard USB cables with a type A connector on the end where you have room and a type mini-B on the end where you don't? USB is a single differential twisted pair with additional gnd and Vbuss wires rated to 420 Mbits/second. Be sure it's protected if someone accidentally plugs in a real USB at either end. Chris - AE6VK From: Phil Harman [ mailto:[EMAIL PROTECTED]] Sent: Sunday, January 29, 2006 12:31 AMTo: FlexRadio@flex-radio.biz; Xylo-SDR DiscussionSubject: [Xylo-SDR] Proof-of-concept successful!This weekend Bill, KD5TFD, completed his integration of our Wolfson A/D + Xylo FPGA + USB interface into PowerSDR. This proof-of-concepth has been completely successful and we are eagerly pushing forward to the next phase of the project.The screen shot below is of our 48k 16 bit full duplex sound card running in PowerSDR using an SDR1000 on 20m http://www.hamsdr.com/dnld.aspx?id=126The noise floor of the Wolfson A/D in this configuration is -140dBm in a 500z bandwidth. The next steps are to increase the sampling rate to 192kHz and 24 bits. Bill is also going to implement his system to overcome the frequency error and drift of the 200MHz Valpey Fisher oscillator. He is using a GPS 1Hz or 10kHz clock to measure the frequency of the DDS output and pass this back over the same USB signal that carries the digital audio. A software routine in PowerSDR will then compare the actual DDS frequency to the desired frequency and make the necessary correction in software. If this works OK then he will look at counting the 200MHz oscillator directly, although picking this off the SDR1000 hardware is bit more involved than the DDS output hence the reason for starting with the DDS output.We are looking at deriving an LVDS signal from the 200MHz oscillator and if anyone has any suggestions as to suitable connectors to use with a single LVDS signal then we would appreciate the information.There is still plenty of room for more C++ and FPGA developers if you are interested in assisting with the project - those willing to lay out PCB's will be especially welcome!73's Phil Vk6APH ___FlexRadio mailing listFlexRadio@flex-radio.bizhttp://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/FlexRadio Homepage: http://www.flex-radio.com Cecil BayonaKD5NWAwww.qrpradio.comI fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
At 09:54 AM 1/31/2006, KD5NWA wrote: LVDS is made for a tightly twisted pair with 100 Ohm impedance, a pair in a CAT5e cable is exactly what is meant to be used with. Does anyone know what the characteristic impedance of a USB cable is? If not, then it's best to stay away from anything unknown. Almost all twisted pair is in the 100-120 ohm impedance range, because the insulation is all pretty much the same epsilon, and the ratios of insulation thickness to wire thickness is pretty constant. It's a transmission line from the transmitter to the receiver and should be treated as such including impedance matching so you do not get reflections, shortcuts will lead to phase noise. Uhhh... phase noise? With a constant frequency signal, the worst that you'll get is reduced signal level (or, changing signal levels). Hopefully, loss in the cable system isn't determining your phase noise levels (i.e. you've got plenty of margin). As far as a connector, a CAT5e RJ45 connector is meant for that impedance, and does an excellent job. But large and bulky.. At 11:30 AM 1/31/2006, Christopher T. Day wrote: Content-Type: multipart/alternative; boundary=_=_NextPart_001_01C6268C.0101442A Content-Class: urn:content-classes:message Could you use standard USB cables with a type A connector on the end where you have room and a type mini-B on the end where you don't? USB is a single differential twisted pair with additional gnd and Vbuss wires rated to 420 Mbits/second. Be sure it's protected if someone accidentally plugs in a real USB at either end. Chris - AE6VK From: Phil Harman [ mailto:[EMAIL PROTECTED]] Sent: Sunday, January 29, 2006 12:31 AM To: FlexRadio@flex-radio.biz; Xylo-SDR Discussion Subject: [Xylo-SDR] Proof-of-concept successful! This weekend Bill, KD5TFD, completed his integration of our Wolfson A/D + Xylo FPGA + USB interface into PowerSDR. This proof-of-concepth has been completely successful and we are eagerly pushing forward to the next phase of the project. The screen shot below is of our 48k 16 bit full duplex sound card running in PowerSDR using an SDR1000 on 20m http://www.hamsdr.com/dnld.aspx?id=126 The noise floor of the Wolfson A/D in this configuration is -140dBm in a 500z bandwidth. The next steps are to increase the sampling rate to 192kHz and 24 bits. Bill is also going to implement his system to overcome the frequency error and drift of the 200MHz Valpey Fisher oscillator. He is using a GPS 1Hz or 10kHz clock to measure the frequency of the DDS output and pass this back over the same USB signal that carries the digital audio. A software routine in PowerSDR will then compare the actual DDS frequency to the desired frequency and make the necessary correction in software. If this works OK then he will look at counting the 200MHz oscillator directly, although picking this off the SDR1000 hardware is bit more involved than the DDS output hence the reason for starting with the DDS output. We are looking at deriving an LVDS signal from the 200MHz oscillator and if anyone has any suggestions as to suitable connectors to use with a single LVDS signal then we would appreciate the information. There is still plenty of room for more C++ and FPGA developers if you are interested in assisting with the project - those willing to lay out PCB's will be especially welcome! 73's Phil Vk6APH ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ... ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
I wasn't talking about signal loss, reflections on the cable due to improper impedance match can cause signal jitter. At 12:27 PM 1/31/2006, Jim Lux wrote: At 09:54 AM 1/31/2006, KD5NWA wrote: LVDS is made for a tightly twisted pair with 100 Ohm impedance, a pair in a CAT5e cable is exactly what is meant to be used with. Does anyone know what the characteristic impedance of a USB cable is? If not, then it's best to stay away from anything unknown. Almost all twisted pair is in the 100-120 ohm impedance range, because the insulation is all pretty much the same epsilon, and the ratios of insulation thickness to wire thickness is pretty constant. It's a transmission line from the transmitter to the receiver and should be treated as such including impedance matching so you do not get reflections, shortcuts will lead to phase noise. Uhhh... phase noise? With a constant frequency signal, the worst that you'll get is reduced signal level (or, changing signal levels). Hopefully, loss in the cable system isn't determining your phase noise levels (i.e. you've got plenty of margin). As far as a connector, a CAT5e RJ45 connector is meant for that impedance, and does an excellent job. But large and bulky.. At 11:30 AM 1/31/2006, Christopher T. Day wrote: Content-Type: multipart/alternative; boundary=_=_NextPart_001_01C6268C.0101442A Content-Class: urn:content-classes:message Could you use standard USB cables with a type A connector on the end where you have room and a type mini-B on the end where you don't? USB is a single differential twisted pair with additional gnd and Vbuss wires rated to 420 Mbits/second. Be sure it's protected if someone accidentally plugs in a real USB at either end. Chris - AE6VK From: Phil Harman [ mailto:[EMAIL PROTECTED]] Sent: Sunday, January 29, 2006 12:31 AM To: FlexRadio@flex-radio.biz; Xylo-SDR Discussion Subject: [Xylo-SDR] Proof-of-concept successful! This weekend Bill, KD5TFD, completed his integration of our Wolfson A/D + Xylo FPGA + USB interface into PowerSDR. This proof-of-concepth has been completely successful and we are eagerly pushing forward to the next phase of the project. The screen shot below is of our 48k 16 bit full duplex sound card running in PowerSDR using an SDR1000 on 20m http://www.hamsdr.com/dnld.aspx?id=126 The noise floor of the Wolfson A/D in this configuration is -140dBm in a 500z bandwidth. The next steps are to increase the sampling rate to 192kHz and 24 bits. Bill is also going to implement his system to overcome the frequency error and drift of the 200MHz Valpey Fisher oscillator. He is using a GPS 1Hz or 10kHz clock to measure the frequency of the DDS output and pass this back over the same USB signal that carries the digital audio. A software routine in PowerSDR will then compare the actual DDS frequency to the desired frequency and make the necessary correction in software. If this works OK then he will look at counting the 200MHz oscillator directly, although picking this off the SDR1000 hardware is bit more involved than the DDS output hence the reason for starting with the DDS output. We are looking at deriving an LVDS signal from the 200MHz oscillator and if anyone has any suggestions as to suitable connectors to use with a single LVDS signal then we would appreciate the information. There is still plenty of room for more C++ and FPGA developers if you are interested in assisting with the project - those willing to lay out PCB's will be especially welcome! 73's Phil Vk6APH ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ... ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875 Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
[Flexradio] Behavior of PEAK HOLD in Preview 12
Eric, I have noticed that if I have PEAK HOLD turned on when I am using the Panadapter that if I change the frequency the peak signal that was displayed stays in the display just shifted by the value of the frequency change. Let me try to explain better with an example. Say I am listening to a quiet band, 14.300 and the signal is flat @ -130 dB. Now a strong signal is present at 14.300, so with the AVG and PEAK HOLD on I see a rise in the signal from 14.300 to 14303. If I move the VFO to 14.303, the 3 KHz rise in signal moves to the left of the center line in the panadapter. Now another strong signal at 14.303 to 14.306 is present. At this point with PEAK HOLD and AVG I now have displayed on my screen a 6 KHz wide increase in signal. This makes looking for signals much harder since if you change frequency the display stays cluttered with previous signal display. I suspect this is the way it works, but I think if you move the VFO you would want to erase the signal displayed by PEAK HOLD. In other words, if the VFO is changed, the display should be reset only if PEAK HOLD is engaged. This is the way my other radios that have a peak hold feature work. So, in a round about way I am asking for the current behavior of PEAK HOLD to be changed when the frequency changes. -Tim --- Tim Ellison mailto:[EMAIL PROTECTED] Integrated Technical Services http://www.itsco.com/ Apex, NC USA 919.674.0044 Ext. 25 / 919.674.0045 (FAX) 919.215.6375 - cell PGP public key available at all public KeyServers
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
At 10:58 AM 1/31/2006, KD5NWA wrote: I wasn't talking about signal loss, reflections on the cable due to improper impedance match can cause signal jitter. How? If the system is stable, mechanically, then any reflections will be fixed, and will only manifest themselves as changes in the phase/amplitude seen at the load with respect to frequency. It's unlikely that the frequency deviation in the source is wide enough that any sort of narrow band reflection phenomenon would be at work, except, perhaps in a pathological case. Added jitter can only result from a modulation process, implying that some second signal is involved, be it noise that is added or multiplied, or some other effect. Yes, a mismatch might make the uncertainty in a mate/remate situation greater, but while mated, the RF phase and amplitude through the mismatch will remain unchanged (although not necessarily the same as in the matched case). In fact, a deliberate mismatch can make the system less sensitive to small changes in source or load impedance, although there are usually better ways to deal with this. So.. explain a mechanism where a fixed and stable mismatch will introduce jitter or phase noise (other than by reducing system SNR). Jim, W6RMK
Re: [Flexradio] [Xylo-SDR] Proof-of-concept successful!
Since I didn't exclude any reasons I don't feel that I should respond on a changed set of conditions. If, it's unlikely, other than by reducing system SNR, sounds to me that getting cable that matches is far better than guessing, assuming, and hoping. I wonder why they bother terminating it then? Why don't we just use a power zip cord or speaker wire, it cheap, and close enough. At 03:03 PM 1/31/2006, Jim Lux wrote: At 10:58 AM 1/31/2006, KD5NWA wrote: I wasn't talking about signal loss, reflections on the cable due to improper impedance match can cause signal jitter. How? If the system is stable, mechanically, then any reflections will be fixed, and will only manifest themselves as changes in the phase/amplitude seen at the load with respect to frequency. It's unlikely that the frequency deviation in the source is wide enough that any sort of narrow band reflection phenomenon would be at work, except, perhaps in a pathological case. Added jitter can only result from a modulation process, implying that some second signal is involved, be it noise that is added or multiplied, or some other effect. Yes, a mismatch might make the uncertainty in a mate/remate situation greater, but while mated, the RF phase and amplitude through the mismatch will remain unchanged (although not necessarily the same as in the matched case). In fact, a deliberate mismatch can make the system less sensitive to small changes in source or load impedance, although there are usually better ways to deal with this. So.. explain a mechanism where a fixed and stable mismatch will introduce jitter or phase noise (other than by reducing system SNR). Jim, W6RMK Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
[Flexradio] 60m power
My reported problem with 60m power out adjustment has gone away. This is not the first time that the first time i bring up a new beta after having just installing it that there is something not working just right. Now that my beta 12 has been run several times I find that everything is working quite normally, although I don't agree with the peak power output reading. Jerry wa2tti I still have a problem of putting my name in teamspeak
