[Flexradio] Zero IF: 1/f noise
From G3PLX: Gerald: Thanks for your response with comments on 1/f noise and image balance. I am really not convinced that 1/f noise is 'physics' in the same sense as, for example, thermal noise is physics which we can't fight. Some circuits exhibit what we term 1/f noise and others don't seem to do so, so I speculate that if we are careful we can design it out. I can see it in my cheapo MP3+, Sami sees it, but Alberto's plot of the Delta 44 spectrum and my results on the Firebox don't show any significant low-frequency noise. There is certainly no sign of it at the input of Gerald's elegant post-QSD amplifier in the SDR1000, which has clearly been designed for the ultimate in low-noise performance, since that's where the signal level is at it's lowest. To me this says we shouldn't be frightened of 1/f noise. I have done a WAV file of an SSB signal received 15dB above noise, received on my SDR1000 into the Firebox using Zero-IF software, and there's no sign of a noise peak in the centre. To do this I 'worked round' the oscillator re-radiation noise by including a unity-gain frequency-conversion (in hardware) before the SDR1000, so it's not a final solution but a demonstration of a possibility. I hoped I could send this to the reflector so that others can listen to it, but this may not be possible. I can email it to anyone who would like to hear it. 73 Peter ___ 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
Re: [Flexradio] Zero IF: 1/f noise
On 5/24/06, Peter Martinez [EMAIL PROTECTED] wrote: I am really not convinced that 1/f noise is 'physics' in the same sense as, for example, thermal noise is physics which we can't fight. Who says you can't fight thermal noise? Just use liquid nitrogen or helium to cool your circuits! On a more serious note: Of course different circuits will exhibit different noise characteristics, but that doesn't make 1/f noise any more less physics than thermal noise. All this discussion may be beside the point, however, because I don't think 1/f is a very significant problem in sounds cards or SDR-1000. exhibit what we term 1/f noise and others don't seem to do so, so I speculate that if we are careful we can design it out. I can see it in my cheapo MP3+, Sami sees it, but Alberto's plot of the Delta 44 spectrum and my results on the Firebox don't show any significant low-frequency noise. Actually, I don't see any 1/f noise. Or maybe very little, but most of the near-DC noise is 50 Hz and its multiples just like you suspected in a previous post. I'm fully aware that my grounding setup is nowhere near perfect, but I know many SDR-1000 users have similar or even worse problems. I have done a WAV file of an SSB signal received 15dB above noise, received on my SDR1000 into the Firebox using Zero-IF software, and there's no sign of a noise peak in the centre. I have done this kind of demonstration myself. It works, but I obviously can see and hear some noise. But please send your file directly to my e-mail address. There's one more reason why using a non-zero IF can be useful. If you're using zero IF, you have to use the exact DDS tuning word that takes you to the frequency you're listening to. But some tuning words will generate a lot of spurs, and there's no way you can avoid them. With non-zero IF you can have 40 kHz (or 90 kHz) of DDS frequencies to choose from. Of course, the current PowerSDR software doesn't yet offer this possibility. 73, Sami OH2BFO ___ 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
Re: [Flexradio] Has anyone seen this CW Transmit problem?
Jeff Anderson wrote: Hi Lee, Very interesting! I haven't been checking my power, so I just tried the following experiment: 1. Using an Autek WM-1 meter (in Peak Mode), set my SDR1K power to 10 watts when read on this meter. 2. Transmit CW: observe RF envelope on an external oscilloscope and Power on wattmeter. Results: Normal Operation: Envelope is clean, and power on wattmeter is 10 watts. Screwy Operation: Envelope appears to have modulation (as seen on scope), and power on wattmeter can be anywhere from, say, 12 to 17 watts (depending upon the apparent depth of the modulation on the signal). (Note: SDR1K Fwd Power also shows a higher reading (15 watts in lieu of the normal 10 watts). So - I'd say there's a good chance you and I are experiencing similar problems. Another strange thing that I've noticed is that, when this problem occurs, there is a slight change in how I perceive the Transmit CW note from my SDR1K speakers - it almost seems as though the note has shifted position spatially. Weird, eh? - Jeff, K6JCA Lee A Crocker [EMAIL PROTECTED] wrote: I have been fighting this problem for several months. The problem started after 1.4.16. Prior to this release the situation was rock solid. I get precisely what you describe. Also my power output advances significantly from a nominal 100w to 135w when I get the modulation. The situation seems to be random and occurs about 10-20% of the time. It will on occasion correct itself during a transmission, or it will go into modulation mode during a transmission. Before it does that I can hear a crackle on the signal. It sometimes has variable penetrance, meaning instead of 135W it may only be 110 or 120 and the modulated portion of the signal is audiably less. I use a P4 3.3ghz with a firebox. I have 2 identical SDR systems including computer and firebox and it happens on both systems. Also I have been told this problem has not occurred at flex headquarters so I am glad to see it is not peculiar to my system. 73 Lee W9OY Has anyone been able to narrow down the problem to the computer soundcard output, or is something going wrong inside the SDR1000 hardware. This problem could be happening in the computer software or the sound card hardware, but identifying which part is wrong would be helpful. There have been cases of some sound card hardware causing the left and right channel to be one sample out of sync. James ___ 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
Re: [Flexradio] Has anyone seen this CW Transmit problem?
Hi James, At this QTH the problem is definitely at the computer output and *not* at the SDR1K itself. I determined this by monitoring the soundcard's output with two channels of an oscilloscope while observing the RF envelope of my transmitted signal on a third channel. In CW mode, the soundcard's outputs normally have a nice 90 degree phase relationship. However, when I observed the screwy RF envelope, this 90 degree relationship was lost, and the resultant phase relationship between the two signals could be anything. The erroneous phase shift was often much greater (in degrees) than one would expect if the soundcard was one sample out-of-sync on either channel (at 96 ksps such a slip would result in a delay shift of only 10 us - I had my scope set to 2 ms per division, and so such a small delta would have been imperceptible to me). My gut feeling is that it's the software. Otherwise, I would expect to experience the same problem when running sideband. But I ran an experiment yesterday in which, while transmitting LSB, I monitored the USB side of my signal with a seperate receiver, and I never heard a change (nor saw a change on the other receiver's s-meter) in the level or quality of the USB signal. I cycled from receive to transmit at least 100 times, and all appeared fine. - Jeff, K6JCA -Original Message- From: James Courtier-Dutton [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 24, 2006 2:22 AM To: Jeff Anderson Cc: Lee A Crocker; FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Has anyone seen this CW Transmit problem? Has anyone been able to narrow down the problem to the computer soundcard output, or is something going wrong inside the SDR1000 hardware. This problem could be happening in the computer software or the sound card hardware, but identifying which part is wrong would be helpful. There have been cases of some sound card hardware causing the left and right channel to be one sample out of sync. James ___ 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
Re: [Flexradio] Zero IF: 1/f noise
Peter, To Sami's comment I want add my purist's 0.02 Euro worth: 1/f noise is real, but cannot be easily seen in the present implementation of the SDR-1000 hardware. As a good designer Gerald has hidden it by: 1) putting the preamplifier gain so high that the noise coming from the front end masks all other noise and 2) selecting the IF frequency (11.025 kHz) well away from the worst 1/f noise area. Already these design decision were enough to make a pretty good receiver for the average ham radio operator on HF bands. Adding the front end gain increases the dynamic range at the weak signal end but limits it with the strong signals as the QSD can stand only about 1.5 Vrms. Ignoring everything else, the 20 kHz wide noise of the output stage alone without signal is about 8.5 uVrms. That calculates roughly to 105 dB blocking range before the sound card. Not bad! But because I know that better is possible with normal price and off-the-shelf components, I wait for the results of the JANUS project. Possibly some minor hardware modifications and adjustments will be necessary in the SDR-1000 to match the promised 120 dB dynamic range of JANUS. 73, Ahti OH2RZ On 24/05/06, Sami Aintila [EMAIL PROTECTED] wrote: On 5/24/06, Peter Martinez [EMAIL PROTECTED] wrote: I am really not convinced that 1/f noise is 'physics' in the same sense as, for example, thermal noise is physics which we can't fight. Who says you can't fight thermal noise? Just use liquid nitrogen or helium to cool your circuits! On a more serious note: Of course different circuits will exhibit different noise characteristics, but that doesn't make 1/f noise any more less physics than thermal noise. All this discussion may be beside the point, however, because I don't think 1/f is a very significant problem in sounds cards or SDR-1000. exhibit what we term 1/f noise and others don't seem to do so, so I speculate that if we are careful we can design it out. I can see it in my cheapo MP3+, Sami sees it, but Alberto's plot of the Delta 44 spectrum and my results on the Firebox don't show any significant low-frequency noise. Actually, I don't see any 1/f noise. Or maybe very little, but most of the near-DC noise is 50 Hz and its multiples just like you suspected in a previous post. I'm fully aware that my grounding setup is nowhere near perfect, but I know many SDR-1000 users have similar or even worse problems. I have done a WAV file of an SSB signal received 15dB above noise, received on my SDR1000 into the Firebox using Zero-IF software, and there's no sign of a noise peak in the centre. I have done this kind of demonstration myself. It works, but I obviously can see and hear some noise. But please send your file directly to my e-mail address. There's one more reason why using a non-zero IF can be useful. If you're using zero IF, you have to use the exact DDS tuning word that takes you to the frequency you're listening to. But some tuning words will generate a lot of spurs, and there's no way you can avoid them. With non-zero IF you can have 40 kHz (or 90 kHz) of DDS frequencies to choose from. Of course, the current PowerSDR software doesn't yet offer this possibility. 73, Sami OH2BFO ___ 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 ___ 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
[Flexradio] Delta 44 Audio settings in general
I wonder if someone can help me out on some audio issues... Reading back over the Delta 44 Quick Start Guide, it states to adjust the mic gain using the ALC meter during transmit and adjust until the peaks just reach 0db. It further says to make certain the compressor is NOT turned on (and I assume the compander too). Problem is, I can not get it to reach 0db no matter how much I turn up the mic pre-amp on the console. If I turn on the compressor and compander, I can reach 0db. I don't think it has anything to do with a weak input, as I am using an outboard mic pre-amp (Behringer Tube Ultragain), and even if I try to increase the output on the audio chain it will not reach 0db. I noticed that the document was published when version 1.3.x was released. Has something changed since then? BTW, I do have In3 set to -10db as it shows in the document. TIA, Brian / w5ami ___ 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
Re: [Flexradio] Delta 44 Audio settings in general
Brian, The MIC meter is before the compressor and the compander in the TX DSP chain. So having these on or not should not affect the input calibration procedure. Make sure that you are using the MIC selection on the meter though and not one of the other selections that are later in the DSP chain. If you are unable to get to 0dB in the MIC meter, then you may need a microphone preamp. Eric Wachsmann FlexRadio Systems -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] radio.biz] On Behalf Of Brian Sherrod Sent: Wednesday, May 24, 2006 8:19 AM To: flexradio Subject: [Flexradio] Delta 44 Audio settings in general I wonder if someone can help me out on some audio issues... Reading back over the Delta 44 Quick Start Guide, it states to adjust the mic gain using the ALC meter during transmit and adjust until the peaks just reach 0db. It further says to make certain the compressor is NOT turned on (and I assume the compander too). Problem is, I can not get it to reach 0db no matter how much I turn up the mic pre-amp on the console. If I turn on the compressor and compander, I can reach 0db. I don't think it has anything to do with a weak input, as I am using an outboard mic pre-amp (Behringer Tube Ultragain), and even if I try to increase the output on the audio chain it will not reach 0db. I noticed that the document was published when version 1.3.x was released. Has something changed since then? BTW, I do have In3 set to -10db as it shows in the document. TIA, Brian / w5ami ___ 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 ___ 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
[Flexradio] VAC312 question
--- Forwarded message follows --- From: Bill Nagle [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject:312 question Date sent: Wed, 24 May 2006 12:33:22 -0400 I recently purchased version 312 of vac and have a question: I have two sound cards in the pc (one is the built in card that is part of the mother board, the other is a pci card (delta 44). I brought up the vac control panel and created two vac's. When i run a recording app using the built in sound card, the vac shows activity on one of the vac's. When i use the delta44 card (with flex rado sdr1000) the vac control panel shows NO activity on the other vac. What I am trying to do is patch the delta44 sound card output through a pair of vac's to the recording app on the main sound card. The little audio repeater program does not work because there is no patch between the delta44 and the vac control panel. Is this perhaps something that a newer vac version has fixed? The computer is a 32 bit athlon 2.8gig with 512m of ram. Bill Nagle [EMAIL PROTECTED] --- End of forwarded message --- Bill Nagle ___ 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
Re: [Flexradio] VAC312 question
Bill: I apologize for being unable to answer your questions. A friend of mine just left surgery and I have been busy with that and the return to work after a week away for business and Dayton. I have been unable to parse your problem/explanation so I put them on the back burner until I had more time. Mazychenko knows nothing about radio and corresponds poorly in English even if it is written clearly and without radio acronyms. I do audio repeater every single day with my Delta 44 outside of the SDR. I start either a recording or a play back which I aim at a virtual cable as the input or output as the case may be and have the other end hooked to the Delta 44 1/2 or Multi as required. Mazych VAC 3.12 is completely reliable here and works seamlessly in all modes of operation with my Delta 44. I am sorry I am unable to help you but I just cannot understand what it is you are trying to do or trying to explain. Using our VAC facilities, you can sink or source virtual audio cables and then have your external programs hooked to them. I typically do this by having the system default sound devices be virtual audio cables and then use them directly with my sound card program or through Audio Repeater. I suggest a block diagram, even hand drawn, scanned and sent to me might help me understand what you are attempting to do. DO NOT USE VAC 4.X until we tell you it has been fixed. Mazychenko completely denies there is a problem and until he fixes it and stops the denials, I suggest it is useless to us. I really want it to work because it has WDM-KS support but it is just broken. Bob N4HY Bill Nagle wrote: --- Forwarded message follows --- From: Bill Nagle [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: 312 question Date sent:Wed, 24 May 2006 12:33:22 -0400 I recently purchased version 312 of vac and have a question: I have two sound cards in the pc (one is the built in card that is part of the mother board, the other is a pci card (delta 44). I brought up the vac control panel and created two vac's. When i run a recording app using the built in sound card, the vac shows activity on one of the vac's. When i use the delta44 card (with flex rado sdr1000) the vac control panel shows NO activity on the other vac. What I am trying to do is patch the delta44 sound card output through a pair of vac's to the recording app on the main sound card. The little audio repeater program does not work because there is no patch between the delta44 and the vac control panel. Is this perhaps something that a newer vac version has fixed? The computer is a 32 bit athlon 2.8gig with 512m of ram. Bill Nagle [EMAIL PROTECTED] --- End of forwarded message --- Bill Nagle ___ 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 -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman Laziness is the number one inspiration for ingenuity. Guilty as charged! ___ 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
[Flexradio] Delta 44 Audio settings in general
-- Forwarded message -- From: Brian Sherrod [EMAIL PROTECTED] Date: May 24, 2006 12:17 PM Subject: Re: [Flexradio] Delta 44 Audio settings in general To: [EMAIL PROTECTED] Eric, Not the mic meter. The ALC meter. Please re-read my original message. It refers to the Delta 44 Quick Start Guide on your website which states to speak into the mic and adjust the _ALC_ level until 0db is reached. I have no problem getting 0db on mic level, but no way can I get 0db on the ALC meter. if this is inccorect, then maybe someone should edit the D-44 document. Thanks, Brian On 5/24/06, Eric Wachsmann - FlexRadio [EMAIL PROTECTED] wrote: Brian, The MIC meter is before the compressor and the compander in the TX DSP chain. So having these on or not should not affect the input calibration procedure. Make sure that you are using the MIC selection on the meter though and not one of the other selections that are later in the DSP chain. If you are unable to get to 0dB in the MIC meter, then you may need a microphone preamp. Eric Wachsmann FlexRadio Systems -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] radio.biz] On Behalf Of Brian Sherrod Sent: Wednesday, May 24, 2006 8:19 AM To: flexradio Subject: [Flexradio] Delta 44 Audio settings in general I wonder if someone can help me out on some audio issues... Reading back over the Delta 44 Quick Start Guide, it states to adjust the mic gain using the ALC meter during transmit and adjust until the peaks just reach 0db. It further says to make certain the compressor is NOT turned on (and I assume the compander too). Problem is, I can not get it to reach 0db no matter how much I turn up the mic pre-amp on the console. If I turn on the compressor and compander, I can reach 0db. I don't think it has anything to do with a weak input, as I am using an outboard mic pre-amp (Behringer Tube Ultragain), and even if I try to increase the output on the audio chain it will not reach 0db. I noticed that the document was published when version 1.3.x was released. Has something changed since then? BTW, I do have In3 set to -10db as it shows in the document. TIA, Brian / w5ami ___ 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 ___ 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
Re: [Flexradio] Delta 44 Audio settings in general
Brian, Changes surrounding the TX Meter selections have caused some confusion here. The OLD ALC setting (1.4.x and before) is now the MIC setting. It was a tap at the beginning of the DSP chain and had nothing to do with ALC. The NEW ALC setting is a tap at the end of the DSP chain just following the ALC and will give readings that reflect everything before it (such as the compressor, compander, EQ, etc). The correct procedure for calibrating the microphone input on the current software is to use the MIC setting on the TX Meter and target 0dB on peaks. This needs to be reflected in all our documentation. Please let me know if you find places other than the Delta 44 QSG where other methods are mentioned. Eric Wachsmann FlexRadio Systems -Original Message- From: Brian Sherrod [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 24, 2006 12:18 PM To: [EMAIL PROTECTED] Subject: Re: [Flexradio] Delta 44 Audio settings in general Eric, Not the mic meter. The ALC meter. Please re-read my original message. It refers to the Delta 44 Quick Start Guide on your website which states to speak into the mic and adjust the _ALC_ level until 0db is reached. I have no problem getting 0db on mic level, but no way can I get 0db on the ALC meter. if this is inccorect, then maybe someone should edit the D-44 document. Thanks, Brian On 5/24/06, Eric Wachsmann - FlexRadio [EMAIL PROTECTED] wrote: Brian, The MIC meter is before the compressor and the compander in the TX DSP chain. So having these on or not should not affect the input calibration procedure. Make sure that you are using the MIC selection on the meter though and not one of the other selections that are later in the DSP chain. If you are unable to get to 0dB in the MIC meter, then you may need a microphone preamp. Eric Wachsmann FlexRadio Systems -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] radio.biz] On Behalf Of Brian Sherrod Sent: Wednesday, May 24, 2006 8:19 AM To: flexradio Subject: [Flexradio] Delta 44 Audio settings in general I wonder if someone can help me out on some audio issues... Reading back over the Delta 44 Quick Start Guide, it states to adjust the mic gain using the ALC meter during transmit and adjust until the peaks just reach 0db. It further says to make certain the compressor is NOT turned on (and I assume the compander too). Problem is, I can not get it to reach 0db no matter how much I turn up the mic pre-amp on the console. If I turn on the compressor and compander, I can reach 0db. I don't think it has anything to do with a weak input, as I am using an outboard mic pre-amp (Behringer Tube Ultragain), and even if I try to increase the output on the audio chain it will not reach 0db. I noticed that the document was published when version 1.3.x was released. Has something changed since then? BTW, I do have In3 set to -10db as it shows in the document. TIA, Brian / w5ami ___ 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 ___ 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
[Flexradio] Issues Remaining
FWIW.I have decided to postpone purchasing an SDR 1K due to the following reported problems. If I am in error please correct.. 1. On CW the rig goes out of phase periodically 2. The power output can suddenly jump from 100 watts to 120 to 130 watts 3. Frequency stability can vary from 15 to 25 hz while transmitting as the osc heats up (design Flaw?) Otherwise the SDR 1k seems to be an excellent rig with great potential, but any one of the above listed issues is a deal killer. Toby W4CAK -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060524/890d76f8/attachment.html ___ 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
Re: [Flexradio] Issues Remaining
Toby: I wouldn't be concerned with the first 2. I've never seen that on mine and the third one I haven't noticed. It wouldn't be enough to bother me even on rtty. Of course with any news group you only hear the few problems and not about the thousands that are working just fine. This radio works ten times better than an Orion, har har. John N1JM On 5/24/06 17:55, Toby Pennington [EMAIL PROTECTED] wrote: FWIW.I have decided to postpone purchasing an SDR 1K due to the following reported problems. If I am in error please correct.. 1. On CW the rig goes out of phase periodically 2. The power output can suddenly jump from 100 watts to 120 to 130 watts 3. Frequency stability can vary from 15 to 25 hz while transmitting as the osc heats up (design Flaw?) Otherwise the SDR 1k seems to be an excellent rig with great potential, but any one of the above listed issues is a deal killer. Toby W4CAK -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/2006 0524/890d76f8/attachment.html ___ 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 ___ 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
[Flexradio] Fwd: Re: Issues Remaining
Hi John..My thoughts also..I have never had any problem with mine at all..I've have had a few OP problems..but nothing has burned down yet..and much better than Yaesu Mark V..Bob John Merrill [EMAIL PROTECTED] wrote: Date: Wed, 24 May 2006 18:49:44 -0400 From: John Merrill [EMAIL PROTECTED] To: Flex FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Issues Remaining Toby: I wouldn't be concerned with the first 2. I've never seen that on mine and the third one I haven't noticed. It wouldn't be enough to bother me even on rtty. Of course with any news group you only hear the few problems and not about the thousands that are working just fine. This radio works ten times better than an Orion, har har. John N1JM W5RG SDR-1000 -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060524/14936730/attachment.html ___ 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
Re: [Flexradio] Issues Remaining
Toby, I don't operate CW very much so I can't add anything about #1 other that what others have said. As for #2, I have never had the power jump on me running in any mode. The SDR1K out 100 watts PEP rain or shine. Matter of fact with the gain limiting logic, you really can't over drive it without having to really work at it. There is a little frequency drift in the first 10-15 minutes the rig is on until it reaches operating temperature. I operate a lot of PSK and I don't ever notice the drift. Also, Flex is supposed to be putting a thermistor on the OX to stabilize it a little more, so this should be a moot point unless you need 10^-4 Hz stability. :-) -Tim --- Tim Ellison ( [EMAIL PROTECTED] ) Integrated Technical Services ( http://www.itsco.com ) -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Toby Pennington Sent: Wednesday, May 24, 2006 5:55 PM To: Flex Subject: [Flexradio] Issues Remaining FWIW.I have decided to postpone purchasing an SDR 1K due to the following reported problems. If I am in error please correct.. 1. On CW the rig goes out of phase periodically 2. The power output can suddenly jump from 100 watts to 120 to 130 watts 3. Frequency stability can vary from 15 to 25 hz while transmitting as the osc heats up (design Flaw?) Otherwise the SDR 1k seems to be an excellent rig with great potential, but any one of the above listed issues is a deal killer. Toby W4CAK -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20060524/890d76f8/attachment.html ___ 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 ___ 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
[Flexradio] Issues Remaining
I am one experiencing some trouble with the CW issue and I would not let that stop me from buying the SDR-1000. I perceive no drift problem and the boys on 75 like the SDR audio better than my Orion. So far there are only 2 of us that have reported the CW problem to my knowledge, so it is a vanishing small problem (unless the problem occurs to you then it is 100% HI). In my case I am using a IBM thinkpad G41 3.3ghz P4 with a firebox and a generic firewire adapter card. I have had the SDR-1000 back to flex and they gave it a clean bill of health. So just don't duplicate my system and you should be fine. Lee W9OY __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ 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
