[Flexradio] new sdr1k
OK - 75 40 good (very!) Now back to the shack with a few pieces of xxx-Fe, A roll of fat CU, and a back of C's. I expect to find the USB disconnect problem near the adapter end of the cable because a mouse with about the same amount of cable doesn't disconnect. Was able to work any station I called yesterday on 75 40. more to come... Jim w4yxu ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] new sdr1k
Jim, Have you reviewed this KB article? http://kb.flex-radio.com/article.aspx?id=10273 -Tim - FRS KB Administrator -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim McLester Sent: Friday, April 20, 2007 8:47 AM To: flexradio@flex-radio.biz Subject: [Flexradio] new sdr1k OK - 75 40 good (very!) Now back to the shack with a few pieces of xxx-Fe, A roll of fat CU, and a back of C's. I expect to find the USB disconnect problem near the adapter end of the cable because a mouse with about the same amount of cable doesn't disconnect. Was able to work any station I called yesterday on 75 40. more to come... Jim w4yxu ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
[Flexradio] spurs
I notice that with spur reduction checked there is a monster spur at 28.588 488 and a while below. This beast goes away at 28.588 489 and above, OR if spur reduction is unchecked. On my machine 10M seems pretty full of spurs and spur reduction just moves them out of the way! Should I be concerned about these on transmit? Jim w4yxu ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
[Flexradio] new sdr1k
Tim. In a word, yes! And it works perfectly. I'm just ornery enough to want to check and find out which end it gets in! I notice flex has a ferrite on the adapter end...??... Jim ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
[Flexradio] new sdr1k
I did both ends... I just thought I might experiment to find out whats REALLY going on! Jim - w4yxu ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] spurs
The behavior of spur reduction is that it does reduce some spurs and moves others out of your way so that they are not in your RX passband, as you have noticed. From the SDR-1000 operating manual Spur Reduction: Adds the use of a software oscillator to avoid DDS frequencies known to have a higher phase truncation related spurious response. In short, rather than tuning each frequency using the DDS (this is what happens when this option is turned off), the software tunes the DDS in 3kHz steps and does fine-tuning in software. Tuning in 3kHz steps also has the advantage of having to send fewer command signals to the hardware. For a complete description of the spur reduction algorithm used, see A Technical Tutorial On Digital Signal Synthesis available from Analog Devices. There is no need to worry about them during TX. -Tim - -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim McLester Sent: Friday, April 20, 2007 11:02 AM To: flexradio@flex-radio.biz Subject: [Flexradio] spurs I notice that with spur reduction checked there is a monster spur at 28.588 488 and a while below. This beast goes away at 28.588 489 and above, OR if spur reduction is unchecked. On my machine 10M seems pretty full of spurs and spur reduction just moves them out of the way! Should I be concerned about these on transmit? Jim w4yxu ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New autotuner -- price?
Moreover, does a person who is going to use a Flex (or any other low-power radio) to drive a linear need an autotuner? 73 Alan NV8A On 04/19/07 09:24 pm I wrote: I don't have the ad in front of me just now, but I am sure I saw that the new Yaesu FT-450 is available with or without an autotuner. I am not sure whether I will buy the autotuner: I don't need one for my SteppIR, and maybe I can figure out a way of using my Icom AH-4 autotuner for other bands with the FlexRadio when the Icom rig gets put into the car. what?? a $2,500 or $4,500 radio that does not come with a built in tuner included... isn't a built in (non optional) tuner pretty much the norm in almost all decent desktop radios now days? ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New autotuner -- price?
___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] RF output with no mic in SSB
At 02:19 PM 4/19/2007, Hulen Smith wrote: Hello Flexers, Some time back I saw a post from someone that explained they were getting rf output (very low) when they were keyed up in SSB but with no mic gain or It's almost like a balanced modulator in an unbalanced condition. Yea yea yea, I know old school. I'd appreciate any ideas. True that while in the carrier modes this will have little consiquence, however in SSB, this won't fly. Oh BTW it isn't oscillation. It's an on frequency signal. It is precisely the same as the unbalanced modulator problem. The SDR1K, in transmit, is basically a programmable oscillator (the DDS), fed through a vector modulator, and the vector modulator inputs are AC coupled (C20,C5, C27, C28), with no provision for adjusting the DC offset (which is what you'd need to suppress the carrier fully). The signal is, as you've noted, quite low level, but it will be fixed. If you put some modulation on the signal (i.e. feed something into I/Q) you'll have a much larger signal to compare against, so it's easy to get the 40dB or so carrier rejection (compared to the desired signal). Most sound cards are also AC coupled (and, of course, if you're using transformers to eliminate ground loops, this is especially so). The FET mux used as the QSE is pretty good in terms of balance (because it's mostly determined by the on resistance of the FETs, and they're all on the same die, so they're pretty well matched). There might be some small imbalance in the clock signals (the DDS output filters are composed of discrete components, and they match well, but not perfectly), and there's small leakage currents in various places that all add up. This is a fundamental problem with using a SDR1K as a signal generator, by the way. It's got great dynamic range on the desired output (80-90 dB, easy), but it has this leakage spur that's always there, and impossible to cancel without a hardware change. If you really need low power AND low DDS leakage, you could run it through some pads. The challenge is if you need both low and high power, since there's no adjustable attenuator in the RF path. Jim, W6RMK ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] RF output with no mic in SSB
At 10:07 PM 4/19/2007, Ahti Aintila wrote: On 20/04/07, Hulen Smith [EMAIL PROTECTED] wrote: harder with a measure of safety, it is also very sensitive to low rf levels. Is there anyone who has figured out a way to completely eliminate this low level of rf from the SDR-1000 when no modulation is present? It's almost like a balanced modulator in an unbalanced condition. Yea yea yea, I Hulen, I have noticed that. My guess is that the carrier leakage may come due to any internal hardware unbalance of the QSE circuit (sampling pulse width, internal Ron resistance, circuit capacitance, transformer, etc. and their combinations) that cannot be completely cancelled by the software. The lack of DC coupling prevents software from totally compensating it. The power dependence seems to indicate some thermal influence to the sampling switch. I'm going to guess it's more temperature changes in the elliptic filters on the DDS output. Lots of reactive components in a fairly high order filter (there's several hundred degrees of phase shift through the filter) with an elliptic/Cauer configuration. All that means more sensitivity to value changes, particularly towards the top of the band. The FETs in the modulator are all on the same die, and their leakage will track pretty well. The other possibility might be the leakage current through the DC block capacitors on the output of the audio buffers, which could easily change with temperature. Jim, W6RMK ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New Auto-tuner!
Alan, All the other manufacturers of Ham gear (Japanese) provide ANTENNA TUNERS as a integral part of their gear, so why would Flex include it ONLY AS A OPTION??? It seems as if only American Radio mfg. concerns are always HARPING ON OPTIONS!!! It would seem that to make the rig effective that the boys would just include it in the OVERALL PRICE!!! Jim/nn6ee ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New Auto-tuner!
I use an ALS-600 amplifier and have an EXTERNAL 1000 watt auto tuner with my SDR-1000. I am trying to think why I would use a 100 watt tuner built into the radio and I can't come up with one reason. I also only know a handful of people that are strictly QRPers or only use 100 watts. Why would I want to pay extra, when I buy a FLEX-5000, for a 100 watt auto tuner built into the radio that I will seldom or never use? Maybe you would rather see everyone pay $2,750.00 for the 5000. What? Misery loves company? Marty KG6QKJ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New Auto-tuner!
Jim .. TenTec transceivers (Omni VII and Orions) are priced without tuners. They offer them as options. --Larry W8ER jim davis wrote: Alan, All the other manufacturers of Ham gear (Japanese) provide ANTENNA TUNERS as a integral part of their gear, so why would Flex include it ONLY AS A OPTION??? It seems as if only American Radio mfg. concerns are always HARPING ON OPTIONS!!! It would seem that to make the rig effective that the boys would just include it in the OVERALL PRICE!!! Jim/nn6ee ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New Auto-tuner!
At 05:29 PM 4/20/2007, Larry W8ER wrote: Jim .. TenTec transceivers (Omni VII and Orions) are priced without tuners. They offer them as options. --Larry W8ER jim davis wrote: Alan, All the other manufacturers of Ham gear (Japanese) provide ANTENNA TUNERS as a integral part of their gear, so why would Flex include it ONLY AS A OPTION??? I think it's driven by production methods. The US mfrs have much smaller volumes, and can more easily do options. The Japanese mfrs are highly automated production lines and produce 1000s of radios. They can't afford to have different versions. The high automation also means that the marginal cost to add some function (e.g. a tuner) is closer to just the parts cost (how much more does a few minutes on the pick and place machine cost..). The high volume means the engineering time is spread over a much larger volume. For Flex and TenTec (and their subs, e.g. LDG) the volumes are lower, so their engineering time is more costly on a per-unit basis. Jim, W6RMK ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] New Auto-tuner!
I like the add on options, personally. I only figured that out after I bought my 1K with all the options, tuner, 2meter and anything else I could add to the cart. I now have come to figure out in time I will want to remove the atu. for a higher rated unit. Thanks, Al KE5EUP KCARC,ARRL,TAPR,AMSAT,HPSDR Jim Lux wrote: At 05:29 PM 4/20/2007, Larry W8ER wrote: Jim .. TenTec transceivers (Omni VII and Orions) are priced without tuners. They offer them as options. --Larry W8ER jim davis wrote: Alan, All the other manufacturers of Ham gear (Japanese) provide ANTENNA TUNERS as a integral part of their gear, so why would Flex include it ONLY AS A OPTION??? I think it's driven by production methods. The US mfrs have much smaller volumes, and can more easily do options. The Japanese mfrs are highly automated production lines and produce 1000s of radios. They can't afford to have different versions. The high automation also means that the marginal cost to add some function (e.g. a tuner) is closer to just the parts cost (how much more does a few minutes on the pick and place machine cost..). The high volume means the engineering time is spread over a much larger volume. For Flex and TenTec (and their subs, e.g. LDG) the volumes are lower, so their engineering time is more costly on a per-unit basis. Jim, W6RMK ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
