Max SNR as Indicator of RX Performance?

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  • simone
    simone
    • Jan 2003
    • 10144
    #121
    Highest SNR's over 30 dB achieved with DRMRX/DReaM

    updated: FritzWue, now achieving 42.5 dB using a Flex-5000A Rx
    edit 08 Nov: FritzWue, now achieving 42.8 dB using a Flex-5000A Rx





    <table align="LEFT" border="1"><tbody><tr><th>Max SNR
    </th><th>By
    </th><th>Receiver
    </th><th>Converter
    </th><th>App
    </th><th>Antenna
    </th><th>Service
    </th><th>Freq(kHz)
    </th><th>Date</th></tr><tr><td>51.4 dB
    </td><td>hsseppo, Helsinki, Finland
    </td><td>AD8099, AD9551, AD831, 21.4 IF
    </td><td>AD831
    </td><td>DReaM 1.2.5c
    </td><td>Direct from Tx
    </td><td>Dream Test
    </td><td>10012
    </td><td>2005-06-30
    </td></tr><tr><td>48.3 dB
    </td><td>mitajohn Athens, Greece
    </td><td>Sat-Schneider DRT1
    </td><td>
    </td><td>Dream
    </td><td>Dream -t burnt CD played into SA602 up-mixer
    </td><td>test
    </td><td>1000
    </td><td>2008-02-09
    </td></tr><tr><td>48 dB
    </td><td>DRM-OM (Bernhard), 25km SE Karlsruhe Germany
    </td><td>Sat-Schneider DRT1
    </td><td>
    </td><td>Fraunhofer IIS software radio V4.0.40
    </td><td>Direct from Tx
    </td><td>Test
    </td><td>6000
    </td><td>2006-04-24 German,

    English Translation
    </td></tr><tr><td>45.1 dB
    </td><td>Bernd DF9RB 150 km n. of Munich, Germany
    </td><td>Sat-Schneider DRT1
    </td><td>
    </td><td>DReaM 1.3.1cvs
    </td><td>3-el ham Yagi, ALA1530, 30m wire or EWE
    </td><td>Voice of Russia
    </td><td>15780
    </td><td>2005-10-16
    </td></tr><tr><td>42.1 dB
    </td><td>René Schmitz, Bonn, Germany
    </td><td>Elektor custom IF, ADA831 2nd mxr, TUF-1,1st mxr preselector
    </td><td>
    </td><td>DReaM 1.1.6c
    </td><td>5m wire
    </td><td>DW Sines
    </td><td>11830
    </td><td>2005-02-05
    </td></tr><tr><td>42.8 dB
    </td><td>FritzWue DK6QI 52N 07E
    </td><td>Flex-5000A
    </td><td>
    </td><td>DReaM 1.10.8cvs
    </td><td>Inverted L- antenna,20m vertical
    </td><td>VoR
    </td><td>7325
    </td><td>2009-11-08
    </td></tr><tr><td>42.0 dB
    </td><td>FritzWue DK6QI 52N 07E
    </td><td>Sat-Schneider DRT1
    </td><td>
    </td><td>DReaM 1.6.1cvs
    </td><td>80m dipole up 20m
    </td><td>DW
    </td><td>13810
    </td><td>2006-09-09
    </td></tr><tr><td>41.2 dB
    </td><td>Bernd DF9RB 150 km n. of Munich, Germany
    </td><td>TS850 AGC inactive
    </td><td>SA612 ceramic resonator
    </td><td>DReaM 1.1.7c
    </td><td>3-el ham Yagi, ALA1530, 30m wire
    </td><td>Voice of Russia
    </td><td>15780
    </td><td>2005-01-31
    </td></tr><tr><td>40.6 dB
    </td><td>DG9BFC, Barenburg, Germany
    </td><td>IC-765 manual gain
    </td><td>Sat-Schneider xtal
    </td><td>Dream 1.6.1cvs
    </td><td>170m delta loop
    </td><td>DW Sines
    </td><td>13810</td><td>2006-09-26
    </td></tr><tr><td>40.3
    </td><td>maxpower Oldenburg, Germany
    </td><td>Pappradio dvlpd by Stephan
    </td><td>
    </td><td>DReaM 1.10.6cvs
    </td><td>longwire
    </td><td>DW Moosbrunn
    </td><td>7310
    </td><td>2008-07-04
    </td></tr><tr><td>40.0 dB
    </td><td>df8uo, Karlsruhe, Germany
    </td><td>FT757GX
    </td><td>Sat-Schneider xtal
    </td><td>Dream 1.3c
    </td><td>dipole
    </td><td>VOR
    </td><td>15780</td><td>2005-10-03
    </td></tr><tr><td>39.1 dB
    </td><td>Digger, CH-5023 Biberstein
    </td><td>FRG7700 + Stabilock 4040 LO
    </td><td>SO42P xtal
    </td><td>Dream 1.6.1cvs
    </td><td>16m LW + 1:1 un-un
    </td><td>DW
    </td><td>13810
    </td><td>2006-09-23
    </td></tr><tr><td>39.1 dB
    </td><td>mitajohn Athens, Greece
    </td><td>Sat-Schneider DRT1
    </td><td>
    </td><td>Dream 1.6.1 cvs
    </td><td>Inverted "L" 9V/16H m
    </td><td>MOI Kuwait
    </td><td>13620
    </td><td>2008-05-11
    </td></tr><tr><td>37.9 dB
    </td><td>simone, Bad Salzschlirf, Germany
    </td><td>FRG100 AGC off
    </td><td>Sat-Schneider
    </td><td>DRMSWR 2.0.34
    </td><td>whip
    </td><td>DW Sines
    </td><td>11830
    </td><td>2005-02-08
    </td></tr><tr><td>37.8 dB
    </td><td>Francois, Petite Rosselle, Fr.
    </td><td>ELAD FDM77 AGC SW + SLOW
    </td><td>
    </td><td>Dream 1.6.1cvs
    </td><td>Twin Zepp
    </td><td>DW
    </td><td>13810
    </td><td>2006-11-17
    </td></tr><tr><td>37.6 dB
    </td><td>hsseppo, Helsinki, Finland
    </td><td>AD8099, AD9551, AD831, 21.4 IF
    </td><td>AD831
    </td><td>DReaM 1.2.5c
    </td><td>5m wire
    </td><td>VoR
    </td><td>15780
    </td><td>2005-06-30
    </td></tr><tr><td>37.5 dB
    </td><td>Han, Netherlands
    </td><td>AOR AR 7030 unmodified
    </td><td>Sat-Schneider
    </td><td>DReaM 1.5cvs
    </td><td>ALA 1530
    </td><td>DW Sines
    </td><td>17700
    </td><td>2006-01-21
    </td></tr><tr><td>36.5 dB
    </td><td>CT1ADT, Sines, Portugal
    </td><td>TS-870 unmodified
    </td><td>11,3 kHz out
    </td><td>DRM 2.0.34
    </td><td>8m vert or 24m dipole
    </td><td>VOR
    </td><td>15780
    </td><td>2004-01-07
    </td></tr><tr><td>36.3 dB
    </td><td>carknue, Frankfurt, Germany
    </td><td>AOR-7030 AGC off
    </td><td>Sat-Schneider xtal
    </td><td>DRMSWR 2.0.34
    </td><td>Wellbrook ALA1530P
    </td><td>DW
    </td><td>5980
    </td><td>2005-10-14
    </td></tr><tr><td>35.9 dB
    </td><td>johnn, Scunthorpe, N.Lincs, UK
    </td><td>DRT-1
    </td><td>
    </td><td>DReaM 1.5cvs
    </td><td>AL1530 loop
    </td><td>DW Sines
    </td><td>17700
    </td><td>2005-12-31
    </td></tr><tr><td>35.9 dB
    </td><td>Funkerberg, Königs Wusterhausen, near Berlin
    </td><td>Elektor
    </td><td>
    </td><td>Dream 1.6.1cvs
    </td><td>10m dipole
    </td><td>DW
    </td><td>5810
    </td><td>2006-03-04
    </td></tr><tr><td>35.6 dB
    </td><td>arniek, Muenster, Germany
    </td><td>FRG-100
    </td><td>Sat-Schneider
    </td><td>DReaM 1.1.1c
    </td><td>homemade loop
    </td><td>DW Sines
    </td><td>5980
    </td><td>2004-10-08
    </td></tr><tr><td>35.2 dB
    </td><td>fibber - Salem, Oregon USA
    </td><td>Yaesu FT-817, 10dB Radio Shack preamp, NCL MW Filter
    </td><td>I5XWW 455k to 12k board
    </td><td>Dream 1.6.1c
    </td><td>80M Dipole
    </td><td>RNW
    </td><td>6130
    </td><td>2008-02-07
    </td></tr><tr><td>34.9 dB
    </td><td>dn0758
    </td><td>elektor
    </td><td>
    </td><td>DRMSWR 2.0.34
    </td><td>Sony AN-1
    </td><td>DW Sines
    </td><td>17800
    </td><td>2004-11-20
    </td></tr><tr><td>34.4 dB
    </td><td>chemclouds, Richmond, Va, USA
    </td><td>Icom IC-R75 AGC off
    </td><td>
    </td><td>DRMSWR 2.0.34
    </td><td>30m inverted-L
    </td><td>CBC Sackville
    </td><td>9800
    </td><td>2004-11-27
    </td></tr><tr><td>34.3 dB
    </td><td>FritzWue DK6QI 52N 07E
    </td><td>FT840
    </td><td>Sat-Schneider
    </td><td>DReaM 1.1.6c
    </td><td>2x 40m LW
    </td><td>DW-Sines
    </td><td>17800
    </td><td>2004-12-18
    </td></tr><tr><td>34.3 dB
    </td><td>Kjell Holen LA6XJ Bergen, Norway
    </td><td>Sat-Schneider DRT1
    </td><td>
    </td><td>DReaM 1.1.7c
    </td><td>70 cm indoor loop
    </td><td>Voice of Russia
    </td><td>12060
    </td><td>2005-01-15 e-mail
    </td></tr><tr><td>34.2 dB
    </td><td>Werner DK8FT
    </td><td>IC R71 AGC off
    </td><td>Sat-Schneider xtal
    </td><td>Dream 1.1.6
    </td><td>4m wire
    </td><td>DW-Sines
    </td><td>17710
    </td><td>2005-02-20 not posted
    </td></tr><tr><td>33.5 dB
    </td><td>johnn, Scunthorpe, N.Lincs, UK
    </td><td>AOR 7030
    </td><td>
    </td><td>DReaM 1.2.4
    </td><td>AL1530 loop
    </td><td>Radio Luxembourg
    </td><td>7145
    </td><td>2005-10-29
    </td></tr><tr><td>33.2 dB
    </td><td>G3VRF, Warwickshire , UK
    </td><td>AD9852 DDS, AD831 Mixer, 2x AD603 IF
    </td><td>12kHz DRM xtal ctld
    </td><td>DReaM 1.1.6c
    </td><td>35cm tuned loop in attic 11m a.g.
    </td><td>DW Sines
    </td><td>11830
    </td><td>2004-11-24
    </td></tr><tr><td>33.2 dB
    </td><td>simone
    </td><td>Coding Tech DWT
    </td><td>
    </td><td>Dream 1.2.3cvs
    </td><td>long wire
    </td><td>Bouquet Flevo NL
    </td><td>7240
    </td><td>2005-07-24
    </td></tr><tr><td>32.5 dB
    </td><td>Bob, St Albans UK
    </td><td>AR88D (60 yrs young!)
    </td><td>Sat-Schneider LC
    </td><td>Dream 1.2.4
    </td><td>Wellbrook LA5030 indoor loop
    </td><td>DW
    </td><td>13790
    </td><td>2005-05-22</td></tr> <tr><td>32.5 dB
    </td><td>Tom VE3MEO Toronto, Canada
    </td><td>Radio Shack DX-394A no AGC nor 2nd IF fltr
    </td><td>LF-D6 filter/NE612 protoboard
    </td><td>DReaM 1.1.1c
    </td><td>G5RV
    </td><td>CBC Sackville
    </td><td>6140
    </td><td>2004-10-19
    </td></tr><tr><td>32 dB
    </td><td>carknue, Frankfurt, Germany
    </td><td>Coding Tech DWT
    </td><td>
    </td><td>Dream 1.3.1cvs
    </td><td>Degen DE31 Active Loop
    </td><td>DW
    </td><td>5980
    </td><td>2005-10-07
    </td></tr><tr><td>31.2 dB
    </td><td>DRM-OM, 25km SE Karlsruhe, Germany
    </td><td>DRT-1
    </td><td>
    </td><td>Dream 1.6.1cvs
    </td><td>Dressler ara100 active ant.
    </td><td>Radio Luxembourg
    </td><td>7295
    </td><td>2006-04-25
    </td></tr><tr><td>30.7 dB
    </td><td>simone
    </td><td>FRG8800
    </td><td>Sat-Schneider
    </td><td>DRMSWR 2.0.34
    </td><td>whip
    </td><td>DW Sines
    </td><td>15435
    </td><td>2004-10-10
    </td></tr><tr><td>30.4 dB
    </td><td>TimoHannes, Petäjävesi, Finland
    </td><td>elektor
    </td><td>?
    </td><td>DRMSWR 2.0.34
    </td><td>active
    </td><td>DW Sines
    </td><td>17800
    </td><td>2004-11-14
    </td></tr></tbody></table> [/b]

    Comment

    • simone
      simone
      • Jan 2003
      • 10144
      #122
      Highest SNR's over 30 dB achieved with DRMRX/DReaM

      update 29 Aug 2010: FritzWue, now achieving 43.8 dB using a Flex-5000A




      <table align="LEFT" border="1"><tbody><tr><th>Max SNR
      </th><th>By
      </th><th>Receiver
      </th><th>Converter
      </th><th>App
      </th><th>Antenna
      </th><th>Service
      </th><th>Freq(kHz)
      </th><th>Date</th></tr><tr><td>51.4 dB
      </td><td>hsseppo, Helsinki, Finland
      </td><td>AD8099, AD9551, AD831, 21.4 IF
      </td><td>AD831
      </td><td>DReaM 1.2.5c
      </td><td>Direct from Tx
      </td><td>Dream Test
      </td><td>10012
      </td><td>2005-06-30
      </td></tr><tr><td>48.3 dB
      </td><td>mitajohn Athens, Greece
      </td><td>Sat-Schneider DRT1
      </td><td>
      </td><td>Dream
      </td><td>Dream -t burnt CD played into SA602 up-mixer
      </td><td>test
      </td><td>1000
      </td><td>2008-02-09
      </td></tr><tr><td>48 dB
      </td><td>DRM-OM (Bernhard), 25km SE Karlsruhe Germany
      </td><td>Sat-Schneider DRT1
      </td><td>
      </td><td>Fraunhofer IIS software radio V4.0.40
      </td><td>Direct from Tx
      </td><td>Test
      </td><td>6000
      </td><td>2006-04-24 German,

      English Translation
      </td></tr><tr><td>45.1 dB
      </td><td>Bernd DF9RB 150 km n. of Munich, Germany
      </td><td>Sat-Schneider DRT1
      </td><td>
      </td><td>DReaM 1.3.1cvs
      </td><td>3-el ham Yagi, ALA1530, 30m wire or EWE
      </td><td>Voice of Russia
      </td><td>15780
      </td><td>2005-10-16
      </td></tr><tr><td>42.1 dB
      </td><td>René Schmitz, Bonn, Germany
      </td><td>Elektor custom IF, ADA831 2nd mxr, TUF-1,1st mxr preselector
      </td><td>
      </td><td>DReaM 1.1.6c
      </td><td>5m wire
      </td><td>DW Sines
      </td><td>11830
      </td><td>2005-02-05
      </td></tr><tr><td>43.8 dB
      </td><td>FritzWue DK6QI 52N 07E
      </td><td>Flex-5000A
      </td><td>
      </td><td>DReaM 1.12b
      </td><td>Inverted L- antenna,20m vertical
      </td><td>VoR
      </td><td>9850
      </td><td>2010-08-29
      </td></tr><tr><td>42.0 dB
      </td><td>FritzWue DK6QI 52N 07E
      </td><td>Sat-Schneider DRT1
      </td><td>
      </td><td>DReaM 1.6.1cvs
      </td><td>80m dipole up 20m
      </td><td>DW
      </td><td>13810
      </td><td>2006-09-09
      </td></tr><tr><td>41.2 dB
      </td><td>Bernd DF9RB 150 km n. of Munich, Germany
      </td><td>TS850 AGC inactive
      </td><td>SA612 ceramic resonator
      </td><td>DReaM 1.1.7c
      </td><td>3-el ham Yagi, ALA1530, 30m wire
      </td><td>Voice of Russia
      </td><td>15780
      </td><td>2005-01-31
      </td></tr><tr><td>40.6 dB
      </td><td>DG9BFC, Barenburg, Germany
      </td><td>IC-765 manual gain
      </td><td>Sat-Schneider xtal
      </td><td>Dream 1.6.1cvs
      </td><td>170m delta loop
      </td><td>DW Sines
      </td><td>13810</td><td>2006-09-26
      </td></tr><tr><td>40.3
      </td><td>maxpower Oldenburg, Germany
      </td><td>Pappradio dvlpd by Stephan
      </td><td>
      </td><td>DReaM 1.10.6cvs
      </td><td>longwire
      </td><td>DW Moosbrunn
      </td><td>7310
      </td><td>2008-07-04
      </td></tr><tr><td>40.0 dB
      </td><td>df8uo, Karlsruhe, Germany
      </td><td>FT757GX
      </td><td>Sat-Schneider xtal
      </td><td>Dream 1.3c
      </td><td>dipole
      </td><td>VOR
      </td><td>15780</td><td>2005-10-03
      </td></tr><tr><td>39.1 dB
      </td><td>Digger, CH-5023 Biberstein
      </td><td>FRG7700 + Stabilock 4040 LO
      </td><td>SO42P xtal
      </td><td>Dream 1.6.1cvs
      </td><td>16m LW + 1:1 un-un
      </td><td>DW
      </td><td>13810
      </td><td>2006-09-23
      </td></tr><tr><td>39.1 dB
      </td><td>mitajohn Athens, Greece
      </td><td>Sat-Schneider DRT1
      </td><td>
      </td><td>Dream 1.6.1 cvs
      </td><td>Inverted "L" 9V/16H m
      </td><td>MOI Kuwait
      </td><td>13620
      </td><td>2008-05-11
      </td></tr><tr><td>37.9 dB
      </td><td>simone, Bad Salzschlirf, Germany
      </td><td>FRG100 AGC off
      </td><td>Sat-Schneider
      </td><td>DRMSWR 2.0.34
      </td><td>whip
      </td><td>DW Sines
      </td><td>11830
      </td><td>2005-02-08
      </td></tr><tr><td>37.8 dB
      </td><td>Francois, Petite Rosselle, Fr.
      </td><td>ELAD FDM77 AGC SW + SLOW
      </td><td>
      </td><td>Dream 1.6.1cvs
      </td><td>Twin Zepp
      </td><td>DW
      </td><td>13810
      </td><td>2006-11-17
      </td></tr><tr><td>37.6 dB
      </td><td>hsseppo, Helsinki, Finland
      </td><td>AD8099, AD9551, AD831, 21.4 IF
      </td><td>AD831
      </td><td>DReaM 1.2.5c
      </td><td>5m wire
      </td><td>VoR
      </td><td>15780
      </td><td>2005-06-30
      </td></tr><tr><td>37.5 dB
      </td><td>Han, Netherlands
      </td><td>AOR AR 7030 unmodified
      </td><td>Sat-Schneider
      </td><td>DReaM 1.5cvs
      </td><td>ALA 1530
      </td><td>DW Sines
      </td><td>17700
      </td><td>2006-01-21
      </td></tr><tr><td>36.5 dB
      </td><td>CT1ADT, Sines, Portugal
      </td><td>TS-870 unmodified
      </td><td>11,3 kHz out
      </td><td>DRM 2.0.34
      </td><td>8m vert or 24m dipole
      </td><td>VOR
      </td><td>15780
      </td><td>2004-01-07
      </td></tr><tr><td>36.3 dB
      </td><td>carknue, Frankfurt, Germany
      </td><td>AOR-7030 AGC off
      </td><td>Sat-Schneider xtal
      </td><td>DRMSWR 2.0.34
      </td><td>Wellbrook ALA1530P
      </td><td>DW
      </td><td>5980
      </td><td>2005-10-14
      </td></tr><tr><td>35.9 dB
      </td><td>johnn, Scunthorpe, N.Lincs, UK
      </td><td>DRT-1
      </td><td>
      </td><td>DReaM 1.5cvs
      </td><td>AL1530 loop
      </td><td>DW Sines
      </td><td>17700
      </td><td>2005-12-31
      </td></tr><tr><td>35.9 dB
      </td><td>Funkerberg, Königs Wusterhausen, near Berlin
      </td><td>Elektor
      </td><td>
      </td><td>Dream 1.6.1cvs
      </td><td>10m dipole
      </td><td>DW
      </td><td>5810
      </td><td>2006-03-04
      </td></tr><tr><td>35.6 dB
      </td><td>arniek, Muenster, Germany
      </td><td>FRG-100
      </td><td>Sat-Schneider
      </td><td>DReaM 1.1.1c
      </td><td>homemade loop
      </td><td>DW Sines
      </td><td>5980
      </td><td>2004-10-08
      </td></tr><tr><td>35.2 dB
      </td><td>fibber - Salem, Oregon USA
      </td><td>Yaesu FT-817, 10dB Radio Shack preamp, NCL MW Filter
      </td><td>I5XWW 455k to 12k board
      </td><td>Dream 1.6.1c
      </td><td>80M Dipole
      </td><td>RNW
      </td><td>6130
      </td><td>2008-02-07
      </td></tr><tr><td>34.9 dB
      </td><td>dn0758
      </td><td>elektor
      </td><td>
      </td><td>DRMSWR 2.0.34
      </td><td>Sony AN-1
      </td><td>DW Sines
      </td><td>17800
      </td><td>2004-11-20
      </td></tr><tr><td>34.4 dB
      </td><td>chemclouds, Richmond, Va, USA
      </td><td>Icom IC-R75 AGC off
      </td><td>
      </td><td>DRMSWR 2.0.34
      </td><td>30m inverted-L
      </td><td>CBC Sackville
      </td><td>9800
      </td><td>2004-11-27
      </td></tr><tr><td>34.3 dB
      </td><td>FritzWue DK6QI 52N 07E
      </td><td>FT840
      </td><td>Sat-Schneider
      </td><td>DReaM 1.1.6c
      </td><td>2x 40m LW
      </td><td>DW-Sines
      </td><td>17800
      </td><td>2004-12-18
      </td></tr><tr><td>34.3 dB
      </td><td>Kjell Holen LA6XJ Bergen, Norway
      </td><td>Sat-Schneider DRT1
      </td><td>
      </td><td>DReaM 1.1.7c
      </td><td>70 cm indoor loop
      </td><td>Voice of Russia
      </td><td>12060
      </td><td>2005-01-15 e-mail
      </td></tr><tr><td>34.2 dB
      </td><td>Werner DK8FT
      </td><td>IC R71 AGC off
      </td><td>Sat-Schneider xtal
      </td><td>Dream 1.1.6
      </td><td>4m wire
      </td><td>DW-Sines
      </td><td>17710
      </td><td>2005-02-20 not posted
      </td></tr><tr><td>33.5 dB
      </td><td>johnn, Scunthorpe, N.Lincs, UK
      </td><td>AOR 7030
      </td><td>
      </td><td>DReaM 1.2.4
      </td><td>AL1530 loop
      </td><td>Radio Luxembourg
      </td><td>7145
      </td><td>2005-10-29
      </td></tr><tr><td>33.2 dB
      </td><td>G3VRF, Warwickshire , UK
      </td><td>AD9852 DDS, AD831 Mixer, 2x AD603 IF
      </td><td>12kHz DRM xtal ctld
      </td><td>DReaM 1.1.6c
      </td><td>35cm tuned loop in attic 11m a.g.
      </td><td>DW Sines
      </td><td>11830
      </td><td>2004-11-24
      </td></tr><tr><td>33.2 dB
      </td><td>simone
      </td><td>Coding Tech DWT
      </td><td>
      </td><td>Dream 1.2.3cvs
      </td><td>long wire
      </td><td>Bouquet Flevo NL
      </td><td>7240
      </td><td>2005-07-24
      </td></tr><tr><td>32.5 dB
      </td><td>Bob, St Albans UK
      </td><td>AR88D (60 yrs young!)
      </td><td>Sat-Schneider LC
      </td><td>Dream 1.2.4
      </td><td>Wellbrook LA5030 indoor loop
      </td><td>DW
      </td><td>13790
      </td><td>2005-05-22</td></tr> <tr><td>32.5 dB
      </td><td>Tom VE3MEO Toronto, Canada
      </td><td>Radio Shack DX-394A no AGC nor 2nd IF fltr
      </td><td>LF-D6 filter/NE612 protoboard
      </td><td>DReaM 1.1.1c
      </td><td>G5RV
      </td><td>CBC Sackville
      </td><td>6140
      </td><td>2004-10-19
      </td></tr><tr><td>32 dB
      </td><td>carknue, Frankfurt, Germany
      </td><td>Coding Tech DWT
      </td><td>
      </td><td>Dream 1.3.1cvs
      </td><td>Degen DE31 Active Loop
      </td><td>DW
      </td><td>5980
      </td><td>2005-10-07
      </td></tr><tr><td>31.2 dB
      </td><td>DRM-OM, 25km SE Karlsruhe, Germany
      </td><td>DRT-1
      </td><td>
      </td><td>Dream 1.6.1cvs
      </td><td>Dressler ara100 active ant.
      </td><td>Radio Luxembourg
      </td><td>7295
      </td><td>2006-04-25
      </td></tr><tr><td>30.7 dB
      </td><td>simone
      </td><td>FRG8800
      </td><td>Sat-Schneider
      </td><td>DRMSWR 2.0.34
      </td><td>whip
      </td><td>DW Sines
      </td><td>15435
      </td><td>2004-10-10
      </td></tr><tr><td>30.4 dB
      </td><td>TimoHannes, Petäjävesi, Finland
      </td><td>elektor
      </td><td>?
      </td><td>DRMSWR 2.0.34
      </td><td>active
      </td><td>DW Sines
      </td><td>17800
      </td><td>2004-11-14
      </td></tr></tbody></table> [/b]

      Comment

      • dadalbinder
        Registered User
        • Feb 2006
        • 369
        #123
        Max SNR in DRM+

        Hello,

        I just read the list of SNRs.

        Is the value in the appendix also a realistic value?

        Generated by Spark Transmitter and demodulated by SoDiRa.


        Best wishes

        Wolfgang Hartmann, Nürnberg
        Attached Files

        Comment

        • VE3MEO
          Registered User
          • Oct 2002
          • 289
          #124
          Originally posted by dadalbinder
          Hello,
          Is the value in the appendix also a realistic value?

          Generated by Spark Transmitter and demodulated by SoDiRa.
          I assume this is at audio frequency IF, e.g., 12 kHz from computer sound card output to sound card input. So it's a valid test of the limits of the encoding and decoding software and the D/A and A/D converters. If the converters had a lot of jitter, the estimated SNR should be lower than for highly stable ones. As is, it is the highest SNR reported but I think all others in the table have also gone through at least an IF upconverter and downconverter.

          Tom VE3MEO

          Comment

          • Digger
            Registered User
            • Mar 2005
            • 10097
            #125
            Almost 60 dB SNR

            A test on my XP computer with Dream to Dream produced a max. SNR of 59.96 dB. The DRM Log-Plotter automatically switches from 45 dB to 55 dB max if the SNR exceeds 45 dB, but unfortunately this log was even better... I had audio fed to the Dream TX, but was not able to get any sound from the speakers. I tested the same set-up on my HP Pavilion in Japan, then I got decoded audio - it probably has something to do with the sound card settings.

            SNR Max.: 59.96 dB
            SNR Min.: 56.44 dB
            Average: 58.94 dB

            The frequency in the log is not relevant. 12 kHz would have been more appropriate...
            Attached Files
            Regards,
            Terje

            https://hobbyradio.se/drm/webplotter.index.html

            Comment

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