Re: [Flexradio] FMT Results
AMEN! Fm KA4SNM -Original Message- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of William H. Fite Sent: Sunday, April 17, 2011 3:47 PM To: K0DAN Cc: FlexRadio@flex-radio.biz; Jeff Singer Subject: Re: [Flexradio] FMT Results Like a lot of other material in this general area, things have been written, on Connie's site and others, that are easily understood by people who already understand them. In 30 years of teaching graduate students and directing their research, I have found this an extremely common phenomenon. It seems perfectly clear to me, Dr. Fite. Well, of course it does. You wrote it. The more education and experience one has, the more difficult it becomes to recall what parts of the early stages were hard to grasp and why. But the responsibility for clear communication resides, by definition, with the transmitter, not with the receiver, a point lost on too many otherwise friendly and eager-to-be-helpful experts. If more people are to become involved in FMTs, experienced FMT-ers are going to have to write, OK, now here is what you do first. Then do this. Then this. Then this. Instead, volunteers, with every intention of being helpful and with every conviction that they are providing clear and straightforward instructions produce something reminiscent of Chief Bellison explaining an equipment failure to Captain De Vriess in* The Caine Mutiny*: *The port bandersnatch got fouled in the starboard rath when we tried to galumph the cutting cable so as not to trip the snozzle again. I had to unshackle the doppelganger and bend on two snarks instead so we could launch in a hurry.* Entertaining...but not helpful. On Sun, Apr 17, 2011 at 1:40 PM, K0DAN k0...@comcast.net wrote: Has anyone written a white paper on the tools/techniques for getting best results in an FMT? 73 dan k0dan - Original Message - From: Jeff Singer jsin...@i1.net To: FlexRadio@flex-radio.biz Sent: Sunday, April 17, 2011 11:38 AM Subject: [Flexradio] FMT Results Tough FMT. I was having trouble calibrating my 5000 to my satisfaction before the test and bailed out of participating. Had something else to do that was pretty important. Just saw the results and it appears that Doppler was terrible which probably explains my calibration problem. Scores were mostly poor. Tom, you can use the Flex scope or phase display to estimate signals to tenths of a Hz. See all results at: http://www.b4h.net/fmt/fmtresults201104.php Jeff K0OD ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] ARRL HBC amp for 1500
hmmm Page not found!! If Americans ever allow banks to control the issue of their currency, first by inflation and then by deflation, the banks will deprive the people of all property until their children wake up homeless. -Thomas Jefferson Date: Sun, 17 Apr 2011 18:32:29 -0400 From: mat...@netcommander.com To: flexradio@flex-radio.biz Subject: [Flexradio] ARRL HBC amp for 1500 I've had several inquiries about this amp since I mentioned it in my last post. I responded directly to all of them but thought I would post this to the group to cover all bases. This 50 watt amp project was the winner of the last ARRL Homebrew challenge. There have been two runs of the PCB/parts kits and I believe the second is now closed. However, it is my understanding that the PCB's alone will now be offered on a ongoing basis. This is the link to the yahoogroup where this amp and other HBC projects are discussed. http://groups.yahoo.com/group/ARRLHBC/ The amp covers 80-10 meters. Usual disclaimer applies...not affiliated...blah blahjust trying to help out. Hope this helps everyone and 73, Michael ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] ARRL HBC amp for 1500
Ron, Try again. It came right up for me. 73, Ray, K9DUR http://k9dur.info -Original Message- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Ron Feltman Sent: Monday, April 18, 2011 8:41 AM To: mat...@netcommander.com; flexradio@flex-radio.biz Subject: Re: [Flexradio] ARRL HBC amp for 1500 hmmm Page not found!! If Americans ever allow banks to control the issue of their currency, first by inflation and then by deflation, the banks will deprive the people of all property until their children wake up homeless. -Thomas Jefferson Date: Sun, 17 Apr 2011 18:32:29 -0400 From: mat...@netcommander.com To: flexradio@flex-radio.biz Subject: [Flexradio] ARRL HBC amp for 1500 I've had several inquiries about this amp since I mentioned it in my last post. I responded directly to all of them but thought I would post this to the group to cover all bases. This 50 watt amp project was the winner of the last ARRL Homebrew challenge. There have been two runs of the PCB/parts kits and I believe the second is now closed. However, it is my understanding that the PCB's alone will now be offered on a ongoing basis. This is the link to the yahoogroup where this amp and other HBC projects are discussed. http://groups.yahoo.com/group/ARRLHBC/ The amp covers 80-10 meters. Usual disclaimer applies...not affiliated...blah blahjust trying to help out. Hope this helps everyone and 73, Michael ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
[Flexradio] Announcing the 2011 FlexRadio Hamvention Banquet
The 2011 FlexRadio Hamvention Banquet FlexRadio Systems will be hosting a social hour with adult liquid refreshments where you can mingle with the FlexRadio staff and volunteer associates enjoy a nice buffet dinner and be present for the famous Flexi Award presentations. Like last year, there will be door prizes to win for those who attend. This year's event will be held on Saturday May 21, 2011 at the Double Tree Dayton Downtown http://doubletree1.hilton.com/en_US/dt/hotel/DAYLTDT-DoubleTree-by-Hilton-Hotel-Dayton-Downtown-Ohio/index.do Location: Double Tree Dayton Downtown 11 S. Ludlow Street Dayton, OH 45402 Parking: There is plenty of street parking near the hotel or you can opt for valet parking in the hotel parking garage for the FlexRadio negotiated rate of $6. Here is the Banquet Schedule: Start-Time: 6pm Cash Bar Opens: 6pm Dinner: 7pm Last Call: 7:45pm Presentations/Awards begin: 8:00pm Close: 10pm Menu: A Night in Italy Dinner Buffet Includes chilled antipasto display, tossed salad, Caesar salad, pasta salad, shrimp scampi, Chicken Parmesan, meat lasagna, basil potatoes, chef's choice of pastas, Italian bread and dessert. To sign up for the 2011 FlexRadio Hamvention Banquet, just order your meal reservation using the On-Line Store URL: http://flexradio.3dcartstores.com/Dayton-Banquet-Ticket_p_831.html -Tim --- W4TME FlexRadio Systems Internet Systems Admin. Product Verification Team Tune In Excitement™ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
Re: [Flexradio] Frequency Errors in the F5K and F3K
George, The VFO / DDS error can be computed, based on the PSDR settings and radio's clocking design. I do not know anything about the F5K or F3K designs. I developed my correction spreadsheet with the help of Analog Devices' datasheet and simulation tool for their AD9951 DDS chip. From what I have read, the Spur Reduction does (sometimes) change the frequency tuning word sent to the DDS; so I keep it off during FMT's. 6 months ago I too was a newbie; finished 6th from last in my first FMT. I'm a retired measurement engineer, and now realize that measurement wasn't just a job I enjoyed very much, it was a passion! John Stuart, KM6QX _ From: geo...@gloria.us [mailto:geo...@gloria.us] Sent: Monday, April 18, 2011 8:02 AM To: John Stuart Cc: FlexRadio@flex-radio.biz Subject: Frequency Errors in the F5K and F3K I have both an F5K and an F3K. Where do I get information regarding the errors that you mentioned. Must these errors be measured or can they be computed? I did use the Rubidium standard as my external reference into the F5K. I did not turn off spur reduction, however. How does spur reduction interact with the measurements? Please excuse my lack of knowledge regarding making measurements. Am a newbie for FMT. I am not even sure how to ask the right questions. Thanks George K2CM (who did miserably on 40M in the last FMT.80 meters was 1hz.) Original Message Subject: Re: [Flexradio] [Bulk] FMT Results From: John Stuart j.w.stu...@comcast.net http://j.w.stu...@comcast.net%3e ; Date: Sun, April 17, 2011 7:16 pm To: FlexRadio@flex-radio.biz (OK Brian Lloyd, I'm jumping in with both feet) With my Flex-1500, and a 'perfect' 10 MHz external reference oscillator, and PSDR set for CWU mode, a 600 Hz Pitch Freq., Spur Reduction turned off, Clock Offset set to 0, IF set to 0 Hz, and the VFO set to 10.000 000 Hz; the Flex's QSD (Quadrature Sampling Detector) will be receiving at 9,999,999.958 Hz, i.e. 42 mHz low. (Actually it's 41.822 mHz low, if your still paying attention) That's a one sentence summary of what I have learned about my Flex-150 over the past few months. With some test equipment, needle pointed probes, and a magnifying glasses, I have figured out the Flex-1500's clocking scheme and discovered some DDS control 'anomalies' (software error?). I then developed an Excel spreadsheet that calculates the exact DDS output frequency, which I have confirmed with 1) direct DDS chip output measurements, 2) mHz resolution signal generator reception tests, and 3) GPS locked radio station reception tests. I doubt that my Excel worksheet would apply directly to the Flex 5k or 3k, but it should in principle. The DDS chips are not 'exact', and if you need to know your VFO frequency to better than 1 Hz, then you need to know how much the DTW (Digital Tuning Word) is truncated. For the Flex-1500, the error can be between -0.004 to -0.042 Hz. Then there is the analog to digital sample rate correction that may also need to be made. For the Flex-1500 this is controlled by another crystal oscillator, which is not referenced to the external 10 MHz oscillator. I plan to write all of this up into some Wiki technical notes (with everyone's help, of course). Finally, to answer Jim's question below; Given all of the settings in my first paragraph above, when I 'receive' my 10 MHz Rb oscillator signal, I measure a 600.042 Hz audio tone at the Phones jack. John Stuart, KM6QX Lafayette, CA -Original Message- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Tim Ellison Sent: Sunday, April 17, 2011 4:07 PM To: jim; 'Jeff Singer'; FlexRadio@flex-radio.biz Subject: Re: [Flexradio] [Bulk] FMT Results Close, but it may not be exactly a 0 DDS offset. My 5000 needs -2 and my 1500 needs +3 to be dead on frequency with a Rb clock. -Tim -Original Message- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of jim Sent: Sunday, April 17, 2011 12:55 PM To: 'Jeff Singer'; FlexRadio@flex-radio.biz Subject: Re: [Flexradio] [Bulk] FMT Results A related, dumb, question... If one takes a 10Mhz standard and uses it for the signal as well as the local reference, should the DDS offset be 0 ? Jim W4YXU ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage:
