[digitalradio] Re: Understanding soundcard basics ?
--- In digitalradio@yahoogroups.com, Vojtech bubn...@... wrote: Hi Andy. I would say the sound card qualities are very similar to receiver. Noise floor Linearity Birdies and other noise I exclude timing issues, because they could most often be corrected for with software. Also I exclude stuff like bad drivers, that would cause dropouts. Thanks to all those that have replied so far. With Vojtech's comments in mind. I will post a little information about the soundcards used by Mircoham ⢠Ultra low noise: - The sound circuits are designed with special attention to low noise - Receive noise floor is better than -90 dBm (typical) in 600 Ohms. - 87 dB (typical) dynamic range rivals that of professional products. - Special circuit design maintains full dynamic range and low noise floor with all radios - both high level and low level outputs. ⢠Independent transmit and receive clock - Transmit clock: 32000, 44100, 48000 Hz - Receive clock: 8000, 11025, 16000, 22050, 32000, 44100, 48000 Hz - sampling rates are native: no up/down conversion or rounding errors I don't need another interface for digital operations (I like my Microkeyer) but what commonly available soundcards can match the above Microham specifications? Andy K3UK
[digitalradio] ALE400 - 14MHz today 9/23.
Auto-Scanning 14074 14094 in ALE400 mode.Set to respond to callsign or group calls. de Rich/N2JR FM18
[digitalradio] Re: Anyone for WINMOR/FLARQ/ALE tests this weekend ?
Yes, count me in: but I'll be using ALE400. callsign band grid..sounds like a thinly veiled contest! Let's have at it. And I suppose you are collecting and compiling the results? de Rich/N2JR --- In digitalradio@yahoogroups.com, obrienaj andrewob...@... wrote: I think it would be fun to try a test of simple message exchanges on 40,30, 20 meters this weekend to compare WINMOR, FLARQ and ALE (standard and 400) . It be be useful to have a group of us that can connect and try a message in all four formats . I would propose the message simply be Mr. Watson--come here--I want to see you. Callsign band grid locator. Anyone willing to try ? Software needed: RMS EXPRESS, FLDIGI, Multipsk (or PC-ALE for standard ALE). Recommend no more than 100 watts . Andy K3UK
Re: [digitalradio] Re: Anyone for WINMOR/FLARQ/ALE tests this weekend ?
Well my HD just crashed this morning, so hopefully I'll get a spare working so I can partcipate. Otherwise it'll be just FLARQ from Linux boot disc. Third HD crash in the past 4 months, getting annoying. Andy K3UK On Wed, Sep 23, 2009 at 10:00 AM, rich3x r...@comcast.net wrote: Yes, count me in: but I'll be using ALE400. callsign band grid ..sounds like a thinly veiled contest! Let's have at it. And I suppose you are collecting and compiling the results? de Rich/N2JR --- In digitalradio@yahoogroups.com digitalradio%40yahoogroups.com, obrienaj andrewob...@... wrote: I think it would be fun to try a test of simple message exchanges on 40,30, 20 meters this weekend to compare WINMOR, FLARQ and ALE (standard and 400) . It be be useful to have a group of us that can connect and try a message in all four formats . I would propose the message simply be Mr. Watson--come here--I want to see you. Callsign band grid locator. Anyone willing to try ? Software needed: RMS EXPRESS, FLDIGI, Multipsk (or PC-ALE for standard ALE). Recommend no more than 100 watts . Andy K3UK -- Andy
[digitalradio] Re: An open letter: W1AW and 80m psk31 interference(A dissent)
Maybe I haven't been paying attention, but what is it that makes 3580 a sacred gathering place for PSK? Why isn't it 070 like it is on some other bands? Why can't we just QSY to get away from W1AW?
Re: [digitalradio] Re: An open letter: W1AW and 80m psk31 interference(A dissent)
Maybe I haven't been paying attention, but what is it that makes 3580 a sacred gathering place for PSK? Why isn't it 070 like it is on some other bands? Why can't we just QSY to get away from W1AW? Many home brew low power rigs, psk included, use the standard and very cheap 3.579 TV color burst crystal. 73 Bill
Re: [digitalradio] Re: An open letter: W1AW and 80m psk31 interference(A dissent)
but why can't W1AW listen first and NOT xmit if busy? On Wed, Sep 23, 2009 at 12:11 PM, Bill V WA7NWP wa7...@gmail.com wrote: Maybe I haven't been paying attention, but what is it that makes 3580 a sacred gathering place for PSK? Why isn't it 070 like it is on some other bands? Why can't we just QSY to get away from W1AW? Many home brew low power rigs, psk included, use the standard and very cheap 3.579 TV color burst crystal. 73 Bill -- Andy
Re: [digitalradio] Re: An open letter: W1AW and 80m psk31 interference(A dissent)
Far as I can tell, they have NEVER done that. That is a sore point to start with, but can you imagine a time when there is never a psk signal on that band (and the band is open?) I cant! The stupid part of it all is that the whole band is available for CW, so why cant they find someplace where there are no signals, and not near a narrow band signal? Another suggestion is on top of some ssb net that is just a bunch sitting around telling others to get off their freq especially when someone else was there first) There are lots of those useless nets. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB All 2 years or more (except Novice) short stints at: DA/PA/SU/HZ/7X/DU CR9/7Y/KH7/5A Pls QSL direct, buro, or LOTW preferred, I Do not use, but as a courtesy do upload to eQSL for those who do. Moderator DXandTALK http://groups.yahoo.com/group/DXandTalk dxandt...@yahoogroups.com Moderator Digital_modes http://groups.yahoo.com/group/digital_modes/?yguid=341090159 - Original Message - From: Andrew O'Brien To: digitalradio@yahoogroups.com Sent: Wednesday, September 23, 2009 12:18 PM Subject: Re: [digitalradio] Re: An open letter: W1AW and 80m psk31 interference(A dissent) but why can't W1AW listen first and NOT xmit if busy? On Wed, Sep 23, 2009 at 12:11 PM, Bill V WA7NWP wa7...@gmail.com wrote: Maybe I haven't been paying attention, but what is it that makes 3580 a sacred gathering place for PSK? Why isn't it 070 like it is on some other bands? Why can't we just QSY to get away from W1AW? Many home brew low power rigs, psk included, use the standard and very cheap 3.579 TV color burst crystal. 73 Bill -- Andy
Re: [digitalradio] Understanding soundcard basics ?
Hello Andy, Is calibration really an issue of concern IF an application can enable a re-calibration process ? If an application enables re-calibration, does that only hold for that application or can it correct the soundcard for other applications. Yes that holds the application. The process is just to measure the real sound card sampling speed (the standard being the PC clock which has a precision better than 0.02%) and to consider this measured speed in your application. There is no way to calibrate the sound card itself . You simply take it as it is... For standard narrow digital modes (as PSK31), if your AF level is good (let's say around 50 %, but not critical), there is no important need to have a very good sound card. For wide digital mode (Packet, ALE, MT63-2000 Hz, 110A), it would be a problem if the amplitude vs AF frequency would be not flat at all (the sound card is not supposed to be a filter inside the telephone bandwith (300-3000 Hz)). For SdR the problem is completly different because you need a real good dynamic. With a basic sound card, having the 10th bit noisy is not important for digimodes, but it would be very bad for a SdR if the input signal is very low (your real dynamic being bad, even if it is supposed to sample on 16 bits). 73 Patrick - Original Message - From: obrienaj andrewob...@gmail.com To: digitalradio@yahoogroups.com Sent: Wednesday, September 23, 2009 1:01 AM Subject: [digitalradio] Understanding soundcard basics ? From what I have read in the past, there is a difference between inexpensive sound cards and the high quality ones. I recall past articles that suggest the high quality ones can result in some very weak signals being detectable in a waterfall, whereas cheap cards may not reproduce the signal. However, as most of us know, even the cheap sound cards effectively render the average ham signals, even quite weak ones. So, aside from the higher end ones rendering weak signals on a waterfall better, what are measurable difference between a poor cheap one and a really good top-of-the-line one ? Can someone explain this is plain English? I am aware of the calibration/timing issue. Although that too does not seem to make a huge difference with many digital modes. Of the numerous digital modes I have tried over the years, PC-ALE and JT65A in WSJT have been the most impacted by calibration issues. I have seen WSJT not decode at all when timing of the soundcard is not correct. Do higher end sound card have less problems with timing/calibration than cheap ones? Is calibration really an issue of concern IF an application can enable a re-calibration process ? If an application enables re-calibration, does that only hold for that application or can it correct the soundcard for other applications. I raise these questions out of general interest, but also because of recent WINMOR test where the poor performance has been blamed , in part, on cheap sound cards or sound cards not dedicated to the application. I don't know enough to argue the point, but my suspicion is that it is really not that sound card related. Andy K3UK Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links
[digitalradio] QRV - Winmor 14112.0 dial
All, We're QRV Winmor 14112.0 dial. Tony -K2MO
[digitalradio] I Hate Computers and Radio!!!! Interference.
HI All, I have been trying for the past week to get my radio quiet from the computer noise, WITHOUT any luck. The computer is a ASUS P5B Deluxe P4-3Ghz w 2.5G of ram, and 3 H/Ds with just under 1TB of space. I have an onboard Sound-card, but I brought a SignaLink-USB which arrived last week for digital modes. I am running Win7 RC (far better then Vista and even lets me run 3 monitors(handy for HRD), which by the way are not causing the noise tested them by switcvhing them on/off and did not interfer with the radio) I believe the power supply in the case is causing the problem because when I turn it on (before any software loads) the radio generates a S7 noise level on 80 and 40, a little better on 20 and above, but still there. Currently it's a waste of time even trying to listen for any digital traffic on 7080, 14.070/112 a bit better. Was even going to try WINMOR, but from what I have been reading I had better get the best RX I can first. I have tried another computer and even though it did generate some noise there, it was bareable with about an S2. As of yet I have not tried another power supply as this would require me to buy a new one (wife might get a bit upset about that one), I could pull one out of a spare computer but it's not as big as the one I have. I am about to do some googling to see if there is any mods on quieting the RF from them. Is there an easy; simple way to making this DAMM computer quieter Any ideas would be a help. Regards Kevin, ZL1KFM. It is coming in through the antenna because when I unscrew the coax from the radio the noise disappears.
