[digitalradio] Re: Odd signal 14171
And it is loud and clear in EU too: 9+10dB So an European Signal? Marc, PD4U
[digitalradio] QRM 14074 thru 14083??
Greetings: I only have one radio to check those frequencies so was wondering if the QRM is generated here or what.. A snapshot is at: http://mysite.verizon.net/haltec/usb-14077.000.jpg and the multiple tones seem to be 30Hz apart across the entire waterfall 300-2500Hz.. Below the subject dial setting is OK as well as above.. Am I the only one hearing these tones?? They've been there during spot checks for over two days now.. Must be my location?? I discovered this trying to print a PSKMail station on 20 metres.. The 30M PSKMail server works fine.. -- Vy 73 de Hal--W8MCHUNIX-GNU/Linux - Slackware 11.0, 2.4.33.3 .
[digitalradio] Propagation Forecast To Return
On Friday October 31, 2008 I'm going to begin publishing my LF/MF/HF/6M frequency radiowave propagation forecast once again. It will be located at http://www.kn4lf.com/kn4lf6.htm . I have an archive of daily solar, space weather and geomagnetic data going back through 2001. Year 2001 is at http://www.kn4lf.com/kn4lf5c.htm when solar cycle 23 was at peak. Wow what a difference in activity then versus now. 73, Thomas F. Giella, KN4LF Lakeland, FL, USA [EMAIL PROTECTED] With God All Things Are Possible KN4LF Daily Solar Space Weather Geomagnetic Data Archive: http://www.kn4lf.com/kn4lf5.htm Solar Cycle 23/24 Forecast Discussion Archive: http://www.kn4lf.com/kn4lf72.htm
Re: [digitalradio] QRM 14074 thru 14083??
Nothing here... On Sun, Oct 26, 2008 at 11:36 AM, Hal [EMAIL PROTECTED] wrote: Greetings: I only have one radio to check those frequencies so was wondering if the QRM is generated here or what.. A snapshot is at:
Re: [digitalradio] QRM 14074 thru 14083??
That looks like the interference I had at one time from my monitor, and in exactly the same place. If you can actually hear that noise on the radio, try turning the computer monitor off. Does the noise stop? If so, you may have to adjust the frequency of the monitor (if it is adjustable). I changed my monitor's frequency from 60 Hz to 90, and it moved the interference out of the ham bands. Hope this helps! 73 Dave KB3MOW Hal wrote: Greetings: I only have one radio to check those frequencies so was wondering if the QRM is generated here or what.. A snapshot is at: http://mysite.verizon.net/haltec/usb-14077.000.jpg http://mysite.verizon.net/haltec/usb-14077.000.jpg and the multiple tones seem to be 30Hz apart across the entire waterfall 300-2500Hz.. Below the subject dial setting is OK as well as above.. Am I the only one hearing these tones?? They've been there during spot checks for over two days now.. Must be my location?? I discovered this trying to print a PSKMail station on 20 metres.. The 30M PSKMail server works fine.. -- Vy 73 de Hal--W8MCH UNIX-GNU/Linux - Slackware 11.0, 2.4.33.3 .
RE: [digitalradio] Re: Odd signal 14171
The signal is back and is strong again today at 16:35z on Sunday. It does sound like RTTY, but unable to copy any of it... I have made a recording if anyone would like a copy. Fred VE3FAL -Original Message- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of marc Sent: Sunday, October 26, 2008 8:50 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: Odd signal 14171 And it is loud and clear in EU too: 9+10dB So an European Signal? Marc, PD4U Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked 30M digital activity at http://www.projectsandparts.com/30m Recommended software : DM780, Multipsk, FLDIGI, Winwarbler ,MMVARI. Yahoo! Groups Links
RE: RE: [digitalradio] Re: Odd signal 14171
very strong here in western Canada, S9 +15, at 1700z John VE5MU d0M digital activity at http://www.projectsandparts.com/30m Recommended software : DM780, Multipsk, FLDIGI, Winwarbler ,MMVARI. http://groups.yahoo.com/;_ylc=X3oDMTJkYXJ1bzFqBF9TAzk3MzU5NzE0BGdycElkAzE4N zExODMEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMjI1MDQwOTgy Image removed by sender. Yahoo! Groups Change http://groups.yahoo.com/group/digitalradio/join;_ylc=X3oDMTJmMmYwMzNoBF9TAz k3MzU5NzE0BGdycElkAzE4NzExODMEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwNmdHIEc2xrA3N0bm dzBHN0aW1lAzEyMjUwNDA5ODI- settings via the Web (Yahoo! ID required) Change settings via email: Switch mailto:[EMAIL PROTECTED]:%20Dige st delivery to Daily Digest | Switch mailto:[EMAIL PROTECTED] 0Format:%20Traditional format to Traditional Visit http://groups.yahoo.com/group/digitalradio;_ylc=X3oDMTJkb2hzNG9rBF9TAzk3MzU 5NzE0BGdycElkAzE4NzExODMEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwNmdHIEc2xrA2hwZgRzdGl tZQMxMjI1MDQwOTgy Your Group | Yahoo! Groups http://docs.yahoo.com/info/terms/ Terms of Use | Unsubscribe mailto:[EMAIL PROTECTED] Recent Activity . 15 New http://groups.yahoo.com/group/digitalradio/members;_ylc=X3oDMTJmNjdhMDdtBF9 TAzk3MzU5NzE0BGdycElkAzE4NzExODMEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwN2dGwEc2xrA3Z tYnJzBHN0aW1lAzEyMjUwNDA5ODI- Members Visit http://groups.yahoo.com/group/digitalradio;_ylc=X3oDMTJldWU3dDliBF9TAzk3MzU 5NzE0BGdycElkAzE4NzExODMEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwN2dGwEc2xrA3ZnaHAEc3R pbWUDMTIyNTA0MDk4Mg-- Your Group Biz Resources Y! http://us.ard.yahoo.com/SIG=13o7qcm97/M=493064.12016255.12445662.8674578/D= groups/S=1705063108:NC/Y=YAHOO/EXP=1225048182/L=/B=Ecr.JULaX9s-/J=1225040982 665732/A=4025321/R=0/SIG=12a352npd/*http:/us.rd.yahoo.com/evt=44092/*http:/s mallbusiness.yahoo.com/r-index Small Business Articles, tools, forms, and more. Yahoo! Groups Latest http://us.ard.yahoo.com/SIG=13o0e3vvf/M=493064.12016262.12445669.8674578/D= groups/S=1705063108:NC/Y=YAHOO/EXP=1225048182/L=/B=Esr.JULaX9s-/J=1225040982 665732/A=5028926/R=0/SIG=11e3tma2a/*http:/new.groups.yahoo.com/moderatorcent ral product news Join Mod. Central stay connected. Popular Y! Groups Is http://us.ard.yahoo.com/SIG=13o2r9bud/M=493064.12016306.12445698.8674578/D= groups/S=1705063108:NC/Y=YAHOO/EXP=1225048182/L=/B=E8r.JULaX9s-/J=1225040982 665732/A=4763761/R=0/SIG=11ou7otip/*http:/advision.webevents.yahoo.com/besto fyahoogroups/ your group one? Check it out and see. . Image removed by sender. attachment: image001.jpgattachment: image002.jpg
Re: [digitalradio] QRM 14074 thru 14083??
On 10-26, Dave 'Doc' Corio wrote: That looks like the interference I had at one time from my monitor, and in exactly the same place. If you can actually hear that noise on the radio, try turning the computer monitor off. Does the noise stop? If so, you may have to adjust the frequency of the monitor (if it is adjustable). I changed my monitor's frequency from 60 Hz to 90, and it moved the interference out of the ham bands. Hope this helps! 73 Dave KB3MOW Greetings and thanks to you and thanks to Andrew for the report.. I'll have to expedite the order for my brain transplant as I turned off all the other monitors and gear __except__ the monitor in use.. DUH!!! The particular one I'm using on that machine is, apparently, dirty compared to the others; changing the vertical refresh moves the RFI around but no joy otherwise.. I'll just change monitors for that machine.. Computers, eh?? HI.. Thanks again and my learning curve is flatter... Hal wrote: Greetings: I only have one radio to check those frequencies so was wondering if the QRM is generated here or what.. A snapshot is at: http://mysite.verizon.net/haltec/usb-14077.000.jpg http://mysite.verizon.net/haltec/usb-14077.000.jpg and the multiple tones seem to be 30Hz apart across the entire waterfall 300-2500Hz.. Below the subject dial setting is OK as well as above.. Am I the only one hearing these tones?? They've been there during spot checks for over two days now.. Must be my location?? I discovered this trying to print a PSKMail station on 20 metres.. The 30M PSKMail server works fine.. -- Vy 73 de Hal--W8MCHUNIX-GNU/Linux - Slackware 11.0, 2.4.33.3 .
Re: RE: [digitalradio] Re: Odd signal 14171
Sounds just like the stuff that was on 40 meters a few years that was coming from south America. Think it was Brazil...
Re: [digitalradio] Queries reg OFDM Transceiver Implementation
An FPGA is a good choice as they have advanced to the point where a 1 MHz wide signal can be processed in a $10-20 device. The number of points to use in the FFT is related to the multipath spread of the received signal. HF signals with ionospheric propagation tyically have a spread between 1 and 10 milliseconds. VHF and UHF signals travelling long distances over partially obstructed paths often have a spread between 10 and 100 microseconds. The guard interval between symbols should be at least as long as the multipath spread. This interval is often chosen to be about 20% of the symbol period as that limits the loss at the receiver due to ignoring this part othe symbol to 1 dB. Subcarrier spacings of 2-8 kHz are often used on VHF and UHF with guard intervals of 30-120 microseconds. On HF the spacing is usually between 30 and 120 Hz in order to increase the guard interval to 2-8 milliseconds. The number of subcarriers is then chosen to fit the available bandwdth. The percentage of the allocated channel that is used depends on the amount of interference allowed in adjacent channels. An OFDM signal is similar to SSB voice in that there will be third-order intermodulation products on each side of the transmitted signal with a bandwidth equal to that of the desired signal. Depending on the quality of the power amplifier, these will be 30 to 60 dB down. The receiver must correct for doppler shift so that the receiver frequency offset is 1 % or less of the subcarrier spacing. More complex signal constellations require closer tracking. A good book on QAM and OFDM is ISBN 0470 09468 0, Quadrature Amplitude Modulation. 73, John KD6OZH - Original Message - From: amman kumar To: digitalradio@yahoogroups.com Sent: Friday, October 24, 2008 03:53 UTC Subject: [digitalradio] Queries reg OFDM Transceiver Implementation Hi, I'm entirely new to the OFDM concepts, Digital radio and we are trying to implement OFDM Transceiver using FPGA. I have the following Queries.Plz clarify 1) How do you determine no.of points in IFFT w.r.to Bandwidth. For example, for 1 MHz bandwidth , what is the maximum amount of bandwidth should be allowed for not having ISI and Cross symbol interference ? 2) How the receiver will interpret Doppler shift? Thanks in Advance. Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/
Re: [digitalradio] Re: Odd signal 14171
I am copying it some 20 dB out of the noise here in Havana at 21:55 UTC on 14173 center. It has 8 threads, plus some other two that show up on the side, at much lower intensity, possibly IMD products, as their amplitude seems to track the larger peaks excursions. The tones are 875, 900, 925, 975, 1025, 1075, 1100, 1125 Hz, with my radio on 14172.0, USB. The smaller tones on the side are 825 and 1175 Hz. It looks like periodic bursts on a PC oscilloscope. I observed the spectrum using Spectran. The sound has a slight resemblance to RTTY, but using just how it sounds to evaluate it is misleading. I would believe it is some sort of PSK, with noticeable ionospheric Doppler and fading affecting the tones, some 2 Hz and 10 dB. 73, Jose, CO2JA --- Fred VE3FAL wrote: The signal is back and is strong again today at 16:35z on Sunday. It does sound like RTTY, but unable to copy any of it... I have made a recording if anyone would like a copy. Fred VE3FAL -Original Message- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of marc Sent: Sunday, October 26, 2008 8:50 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: Odd signal 14171 And it is loud and clear in EU too: 9+10dB So an European Signal? Marc, PD4U
Re: [digitalradio] If you did not get on 30M today, you missed the following
Seems that just a very few listen to the ARQ modes now days.
Re: [digitalradio] Re: Odd signal 14171
Interesting Jose, I hope some ID's it soon, must have good finals in their transmitter...it has been QRV all day! On Sun, Oct 26, 2008 at 6:30 PM, Jose A. Amador [EMAIL PROTECTED] wrote: I am copying it some 20 dB out of the noise here in Havana at 21:55 UTC on 14173 center. It has 8 threads, plus some other two that show up on the side, at much lower intensity, possibly IMD products, as their amplitude seems to track the larger peaks excursions. The tones are 875, 900, 925, 975, 1025, 1075, 1100, 1125 Hz, with my radio on 14172.0, USB. The smaller tones on the side are 825 and 1175 Hz. It looks like periodic bursts on a PC oscilloscope. I observed the spectrum using Spectran. The sound has a slight resemblance to RTTY, but using just how it sounds to evaluate it is misleading. I would believe it is some sort of PSK, with noticeable ionospheric Doppler and fading affecting the tones, some 2 Hz and 10 dB. 73, Jose, CO2JA --- Fred VE3FAL wrote: The signal is back and is strong again today at 16:35z on Sunday. It does sound like RTTY, but unable to copy any of it... I have made a recording if anyone would like a copy. Fred VE3FAL -Original Message- From: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com[mailto: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com] On Behalf Of marc Sent: Sunday, October 26, 2008 8:50 AM To: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com Subject: [digitalradio] Re: Odd signal 14171 And it is loud and clear in EU too: 9+10dB So an European Signal? Marc, PD4U -- Andy K3UK
[digitalradio] Re: ARLB015 FCC Responds to ARRL Petition Against Experimental License using 40 Meter Band
wonder why the world the FCC would grant such an experimental license. Among many other reasons for denying the experimental license it is my understanding that it is a long-term goal was to move broadcast stations away from the 40 m amateur band - at least in areas including Europe and the United States. I cannot imagine having a digital signal of that strength doing such good that would rate being granted experimental license - especially at the bandwidth and power levels covered in a license. I would like to read the application to the FCC asking for such a license. We have tried to get some concessions made for digital transmissions over a considerable period of time. Why would this high power station receive such special treatment? Is anyone aware of where I can obtain a copy of the application? Dick Zseltvay, KC4COP --- In digitalradio@yahoogroups.com, Mark Thompson [EMAIL PROTECTED] wrote: SB QST @ ARL $ARLB015 ARLB015 FCC Responds to ARRL Petition Against Experimental License using 40 Meter Band ZCZC AG15 QST de W1AW ARRL Bulletin 15 ARLB015 From ARRL Headquarters Newington CT October 24, 2008 To all radio amateurs SB QST ARL ARLB015 ARLB015 FCC Responds to ARRL Petition Against Experimental License using 40 Meter Band On Monday, October 20, the ARRL filed a Petition for Modification or Cancellation of Experimental Authorization (Petition) with the FCC with respect to WE2XRH. According to the FCC, this experimental license -- issued to Digital Aurora Radio Technologies (DART) -- proposes to test digital transmissions in 4.50-5.10 MHz, 7.10-7.60 MHz and 9.25-9.95 MHz for a terrestrial digital radio service to the citizens of Alaska. The League's protest was prompted by the certainty that high-power operation in the frequency range 7.10 to 7.30 MHz would cause unacceptable and harmful interference to the Amateur Radio Service in this part of the 40-meter band, which is an exclusive amateur allocation in ITU Region 2 (North and South America). On October 24, the FCC responded by issuing an amended license that redefined one of the station's frequency ranges to eliminate conflict with the Amateur Radio Service. The amended license narrows the range to 7.30 to 7.60 MHz and gives as the reason for the change, operation in the band 7.1-7.3 MHz will cause harmful interference to Amateur Radio Service licensees. We are delighted that the FCC acted so promptly to correct this error and are pleased that the matter has been resolved, said ARRL CEO David Sumner, K1ZZ. WE2XRH will be using a 20 kHz bandwidth digital emission at a transmitter output power of 100 kW and an ERP of 660 kW within a radius of 1500 kilometers of Delta Junction, Alaska. According to the amended license, the transmissions will take place in the frequency ranges 4.4 to 5.1 MHz, 7.3 to 7.6 MHz and 9.25 to 9.95 MHz. /EX
[digitalradio] Olivia Article in December QST
Article about Olivia digital mode slated for December QST magazine Posted by: garylinnrobinson [EMAIL PROTECTED] garylinnrobinson Date: Sat Oct 25, 2008 3:33 pm ((PDT)) For anyone who may be interested there will be an article in the December 2008 issue of QST about the Olivia digital mode. It is a general information article and it is hoped that it will help create more Olivia activity on the ham bands The article is called Ghost QSO's -- Olivia Returns from the Noise Subtitle Olivia -- the magic mode Worth reading (though I'm biased since I wrote it) if you are at all interested in quality digital qso's! Also - On my web site I have posted versions (based off of FLDigi 3.03AB) of FLDigiROL - my own modified version. There are binaries for WIndows, Linux (compiled on Kubuntu 8.04), and source code available. These are beta versions and have very little in the way of documention hi hi! They will be updated in the future when FLDigi stabilizes and not so many bug fix and updates come out so often. I have made modifications and added features that suit me so it may NOT suit anyone else's taste. But they are available for anyone to look at on : http://home.roadrunner.com/~rolswana/
[digitalradio] Re: Odd signal 14171
--- In digitalradio@yahoogroups.com, marc [EMAIL PROTECTED] wrote: And it is loud and clear in EU too: 9+10dB So an European Signal? Marc, PD4U Very loud here today too
Re: [digitalradio] Re: Odd signal 14171
Might be coming from Europe. I was hearing an EI station stirring up a pileup one kHz up. The EI station was keeping this signal out of his USB passband, so I assume it was a QRM source for him ... 8-) So, this signal coming from beyond the skip zone in EI. 73, Jose, CO2JA --- Andrew O'Brien wrote: --- In digitalradio@yahoogroups.com, marc [EMAIL PROTECTED] wrote: And it is loud and clear in EU too: 9+10dB So an European Signal? Marc, PD4U Very loud here today too
