[Flexradio] Is this a Spur?
I have a SDR-1000 that I am using with a FA-66 sound interface. I am experiencing something like a spur but possibly it is something else. I get this on 192KHz or 96 Khz (have not tried 48KHz). On lower sideband and on any band I get a spike on the PowerSDR display. It is spaced about 1 KHz below the center frequency. So if I am listening to SSB 80M this spike is right in the middle of the passband and I hear a tone. As I tune the radio the spike always stays 1Khz below the center frequency and the pitch of the tone stays the same. This is with spur reduction off. With spur reduction on the spike will jump around as I tune so I hear different pitch tones when I tune. When I am listening to a station this tone interferes with the station. With the preamp on the effect is not as pronounced. If I switch to upper sideband I do not hear this interference but I see the spike outside of the passband. I have tried the radio with two different computers with the same result. Does anyone have any suggestions for troubleshooting this issue? Thanks -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/f2f722bd/attachment.html ___ 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] MacOsX software in project ?
Hi Iñigo, you should join the dttsp-linux yahoo group. The DttSP code for linux compiles and runs on OsX (at least the MacBook Pro that I have which is an Intel architecture). I am currently working on a GUI written in Java that runs on both Linux and OsX for the SDR-1000. Hopefully this can be extended to work with the SDR-5000 when the hardware interface is implemented for Linux. Regards, John g0orx/n6lyt Iñigo Bastarrika Berasategi wrote: > Hi there! > > Still waiting for my SDR5K-A. > > I am a Mac user and unfortunately I will need to use a PZ for > managing this wonderful machine. > > Is there any project to make MacOsX software for it ? > > I know some of you are using Parallels Desktop with Xp in you Mac > Intel machines but it is not the same as using a native software. > > > 73 de Iñigo EA2BXV > > > ___ > 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] Digital Mode Software other than MixW
An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/773fa3fb/attachment.html ___ 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] Lower DSP Buffer for SSB Receiving Weak Sigs
I gave a talk at CSVHF some years ago on Stochastic Resonance. Strictly prepared from reading about something I found interesting and not from any real experience or knowledge of the subject formally. At the same time, in Vienna happened to meet someone working on speech compression, etc. on the PhD level and he agreed that the topic is appropriate to weak signal work. There are several different aspects to this. In WW2, people found that some of the complex electromechanical instruments worked better in the air than on the bench. The vibration of the engines "unfroze" the workings and in some cases little rotary vibrators were added to the boxes. In the same way, sometime dithering can be added to the input signal and subtracted later to help do away with the A/D noise. But SR really is the fact that in some cases, adding random noise to a weak signal can actually cause a (real or perceived?) resonance type increase in the wanted signal. I suspect that the atmospheric noise we normally hear may be enough or even more than enough to do this. The noise level is quite critical. Just guessing...DSP might subtract that effect and make the signal less readible. I'm sure that there are some on this list already at speed on this topic and can add more. It is an interesting concept. N0UU ___ 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] [OT] Did you see Cowboy Bob?
Whoops! I did not mean QST, but CQ. Too many periodicals showing up on the same day :-) -Tim -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Ellison Sent: Thursday, September 27, 2007 3:46 PM To: FlexRadio@flex-radio.biz Subject: [Flexradio] [OT] Did you see Cowboy Bob? If not, look on page 96 of the October 2007 QST. Ya can miss him! Congratulations Bob on wining the prestigious CSVHFS Chambers Award. -Tim W4TME -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20070927/5ffd5a1f/attachment.html ___ 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] [OT] Did you see Cowboy Bob?
If not, look on page 96 of the October 2007 QST. Ya can miss him! Congratulations Bob on wining the prestigious CSVHFS Chambers Award. -Tim W4TME -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/5ffd5a1f/attachment.html ___ 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] MacOsX software in project ?
Hi there! Still waiting for my SDR5K-A. I am a Mac user and unfortunately I will need to use a PZ for managing this wonderful machine. Is there any project to make MacOsX software for it ? I know some of you are using Parallels Desktop with Xp in you Mac Intel machines but it is not the same as using a native software. 73 de Iñigo EA2BXV ___ 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] Digital Mode Software other than MixW
Doug, I have not found any of the digital SW that has not worked yet.I have used.. EasyPal - Digital Photos MixW - RTTY, psk31, Olivia, etc Multipsk - Rtty, psk31, Olivia, (but hard to use) HamScope - RTTY, psk31, others (easy to use and free) Ham Radio Deluxe - psk31 (like the psk31 bandspread, free for now) DRM - for Digital Radio (not many signals strong enough for DRM here in Central Tx) some of the ones that I have used and they all work fine.. MixW is the most consistent. 73, Dudley WA5QPZ At 01:19 PM 9/27/2007, Doug McCann wrote: >I tried MixW and while I can get it to work, prefer some of the other >programs. >Please let me know what other digital mode and SSTV software any of you have >had success with using the SDR-1000 >Thanks in advance. > >Doug, VA3CR >www.va3cr.net > > > > >___ >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/ -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/6b3f439e/attachment.html ___ 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] Digital Mode Software other than MixW
Doug, Simon Brown, HB9DRV, directly supports the PowerSDR CAT command set in his free Ham Radio Deluxe (HRD) software. Integrated into HRD is PSK31.exe which provides one of the best PSK-31 interfaces around. In beta testing is Digital Master 780 (DM780) which is a multi-mode digital program. It is also integrated into the beta versions of HRD. Both PSK31 & DM780 include his "SuperBrowser" which turns the waterfall on its side & simultaneously displays all of the data streams within the passband of the audio. All of Simon's software is free. I used HRD & DM780 with my SDR-1000 in the NAQP/RTTY contest this summer & the combination worked magnificently. Not only my 1st ever RTTY contest, they were my 1st ever RTTY contacts. 73, Ray, K9DUR ___ 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] Computers and Flex5000A
I recently received my Flex5000A and tried it with my old computer. It is a 1.6 GHz Pentium 4 with 2 GB of ram. I could run the software at 48000 sampling and 512 buffer. The CPU usage was 40 to 50 % with some drop outs. I then bought a new computer, E6750 CPU and 2 GB of ram. My CPU usage is now 5 to 10 %. The Dual Core CPU is great. I bought the system for about $600, no monitor or operating system. Mouse, keyboard, and speakers came with it though. I bought it with Windows XP installed, another $100. Larry K6HLH ___ 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] Digital Mode Software other than MixW
I tried MixW and while I can get it to work, prefer some of the other programs. Please let me know what other digital mode and SSTV software any of you have had success with using the SDR-1000 Thanks in advance. Doug, VA3CR www.va3cr.net ___ 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] FW: (no subject)
You're not hallucinating Jim. I was listening to RTTY this morning and noticed the same latency with VAC only it got up to ~3 sec. No amount of buffer diddling would fix it, VAC off/on was the only temporary cure. Also, Advanced PA Calibration is broke. 73, Steve - K5FR SDR1k - D44 - WinXPsp2 - svn1633 -Original Message- Jim McLester SDR1k - FA66 - WinXPsp2 svn1635 Interesting phenomena (to me anyway) Using VAC to add speech processing seems to work well now. However, after a period of time the latency appears to increase to about 1 second. Clicking VAC off, then back on sets the latency back to a hundred ms. or so for a while. I must be hallucinating. Seems strange. 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] (no subject)
Ha, I just though it was me...but the same thing happens with digital The start of signal starts to have an increasing lag. Change the Latency Manual on the VAC page opposite what it is makes start up work prompltly. I notice especially on rtty/psk where I click the buffer button and there is a lag before the rig starts transmitting. If 'Manual' is enabled, disable it. If disabled, enable it... Next time the lag gets too long, reverse the setting. lol On 9/27/2007 11:36:28 AM, Jim McLester ([EMAIL PROTECTED]) wrote: > SDR1k - FA66 - WinXPsp2 svn1635 > > Interesting phenomena (to me anyway) > > Using VAC to add speech processing seems to work well now. > > However, after a period of time the latency appears to increase to about > 1 second. Clicking VAC off, then back on sets the latency back to a > hundred ms. or so for a while. I must be hallucinating. Seems strange. > > 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] Seperate DSP Buffer Settings for Transmit & Receive
OK, no problem. Searching the Enhancement for similar requests is not easy and I must have missed it. There is no need to resubmit. -Tim -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave & Nancy Ridge Sent: Thursday, September 27, 2007 12:06 PM To: FlexRadio@flex-radio.biz Subject: [Flexradio] Seperate DSP Buffer Settings for Transmit & Receive Thanks Tim for your support. K2WS, Alan has asked for independent DSP buffer settings in the "Feature Request". It is number 1061 posted on June 18, 2007. His request is for a different reason but the feature is the same. Since what we both want, but for different reasons, may help to move the request up the list. I hate to re-submit and duplicate his request since I know that FlexRadio is covered up with changes to the software. Carl, thanks for your confirmation of my DSP buffer observation. (Improving near noise signal reception) Yes, the DSP filter shape factor changes dramatically with different buffer setting, as it is intended to do. Dave, W9DR -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20070927/ddf820c3/attachment.html ___ 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] Interface between DXLab Rig Control and powerSDR
Hey Neal, Bob, Thanks, think maybe a small step in understanding between two great pieces of SW: PowerSDR & DXLabs Thanks again, Rob On Thu, 27 Sep 2007 15:00:57 + "Neal Campbell" <[EMAIL PROTECTED]> writes: > Enjoy! I got it from the SVN download of source and binary files. > > Neal > > On 9/27/07, Rob Dennison <[EMAIL PROTECTED]> wrote: > > Hi Flexers, > > > > Has FlexRadio considered publishing the current rig control > interface? > > > > Maybe I just haven't asked the KB the right question? > > > > Anyway thanks in advance for your answer. Also thanks for > creating such > > a great radio! > > > > 73, > > > > Rob > > AB7CF > > > > ___ > > 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] (no subject)
SDR1k - FA66 - WinXPsp2 svn1635 Interesting phenomena (to me anyway) Using VAC to add speech processing seems to work well now. However, after a period of time the latency appears to increase to about 1 second. Clicking VAC off, then back on sets the latency back to a hundred ms. or so for a while. I must be hallucinating. Seems strange. 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] (no subject)
SDR1k - FA66 - WinXPsp2 - svn1635 Looks like PA Cal Advanced broke again! 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] Seperate DSP Buffer Settings for Transmit & Receive
Thanks Tim for your support. K2WS, Alan has asked for independent DSP buffer settings in the "Feature Request". It is number 1061 posted on June 18, 2007. His request is for a different reason but the feature is the same. Since what we both want, but for different reasons, may help to move the request up the list. I hate to re-submit and duplicate his request since I know that FlexRadio is covered up with changes to the software. Carl, thanks for your confirmation of my DSP buffer observation. (Improving near noise signal reception) Yes, the DSP filter shape factor changes dramatically with different buffer setting, as it is intended to do. Dave, W9DR -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/ddf820c3/attachment.html ___ 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] Lower DSP Buffer for SSB Receiving Weak Sigs
Dave, in a left-handed way I just confirmed your observations. With the DSP buffer set to 2048, filters are very sharp and straight, 25 Hz setting only hears a small slice of one signal. With the DSP buffer set to 256, filter no longer has any real effect. I then hear artifacts (on CW) over 750 Hz away, despite the 25 Hz filter selection. I also did hear the difference in ability to copy weak signal better with the 256 setting as well. Side note (no pun intended): at all settings on my SDR-1000, CW reception with narrow filters is far better with the NR turned off. 73, Carl WC0V Dave & Nancy Ridge wrote: > Thanks Dale, Bob and Lee for your thoughts. I will be looking forward to > separate DSP for transmit and receive. > > Dale, as I said in my original post, I use 2.4K filter but have tried many > other filter widths. Yes, I have tried shifting the filter up/down with no > discernible difference. > > Lee, I have used a very good set of "cans" (earphones) and have use Logitech > speakers also. The receive DSP buffer of 256 works better on both. You are > right that the human brain is a very good filter in digging out signals in > the noise. The signals that I am trying to copy is mostly in the noise except > for Meteor Scatter bursts. > > I believe that the DSP receive filter with a buffer setting of 256, with less > steep shirts, has little to do with the enhancement/advantage of this filter. > The less latency of this buffer size has no advantage to this operation. > > If you look at a CW signal on the Panadapter with the DSP buffer setting of > 256 and compare the peak of the wave form with a DSP buffer setting of 4096, > you with see that the peak is rounded off in 4096 but has a sharp tip in 256. > (Set your Panadapter to 4X) You will also hear the CW signal more discernible > in 256. (Assuming that there are not signals close to the frequency) > > The receive SSB audio in 256 DSP has a much sharper, crisper sound in 256! I > realize that in a crowded band you do not want this kind of shape factor. > Also, you do not want to transmit SSB using this DSP, thus the need for > separate transmit and receive DSP settings. I am standing by for thatwhat > a great radio and concept this is. Thanks to all those who contribute to the > software! > > Dave, W9DR > -- next part -- > An HTML attachment was scrubbed... > URL: > http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/3e5a7862/attachment.html > > ___ > 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] Interface between DXLab Rig Control and powerSDR
Hi Flexers, Has FlexRadio considered publishing the current rig control interface? Maybe I just haven't asked the KB the right question? Anyway thanks in advance for your answer. Also thanks for creating such a great radio! 73, Rob AB7CF ___ 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] Lower DSP Buffer for SSB Receiving Weak Sigs
Thanks Dale, Bob and Lee for your thoughts. I will be looking forward to separate DSP for transmit and receive. Dale, as I said in my original post, I use 2.4K filter but have tried many other filter widths. Yes, I have tried shifting the filter up/down with no discernible difference. Lee, I have used a very good set of "cans" (earphones) and have use Logitech speakers also. The receive DSP buffer of 256 works better on both. You are right that the human brain is a very good filter in digging out signals in the noise. The signals that I am trying to copy is mostly in the noise except for Meteor Scatter bursts. I believe that the DSP receive filter with a buffer setting of 256, with less steep shirts, has little to do with the enhancement/advantage of this filter. The less latency of this buffer size has no advantage to this operation. If you look at a CW signal on the Panadapter with the DSP buffer setting of 256 and compare the peak of the wave form with a DSP buffer setting of 4096, you with see that the peak is rounded off in 4096 but has a sharp tip in 256. (Set your Panadapter to 4X) You will also hear the CW signal more discernible in 256. (Assuming that there are not signals close to the frequency) The receive SSB audio in 256 DSP has a much sharper, crisper sound in 256! I realize that in a crowded band you do not want this kind of shape factor. Also, you do not want to transmit SSB using this DSP, thus the need for separate transmit and receive DSP settings. I am standing by for thatwhat a great radio and concept this is. Thanks to all those who contribute to the software! Dave, W9DR -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070927/3e5a7862/attachment.html ___ 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] Lower DSP Buffer for SSB Receiving Weak Sigs
I wonder if this has to do with the nature of whatever external audio amp/speaker or headphones you are using? You (as in your brain) can process signals below the noise often by several dB so I wonder if its related in some way to the interface between the radio and your ear and how 256 buffers effect that. Bob measured to the speaker wire but not to the ear. 73 W9OY Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545433 ___ 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/
