Max SNR as Indicator of RX Performance?

[suraj]

Suraj - Bangalore, India

29dB from DW

[VE3MEO]

Suraj - Bangalore, India

29dB from DW

Congratulations Suraj. When you get reception exceeding 30 dB SNR, I'd be pleased to add your report to the table. You need to provide some evidence like a report from DRMCalc plus details of your equipment. There are lots of examples you can follow in the table.

Tom

[FritzWue]

Hi Tom,

the Flex-5000A has joined the >40dB SNR club, details in the DRMcalc:

http://www.drmrx.org/forum/showthread.php?p=47487#post47487

[mitajohn]

July 05

Hi All,

@ Fritz, very well done my friend! My top record until now was with DRT1 from 13620 KHz at 39.1 dB SNR and in the "lab" at better than 48 dB...
@ Tom, apropos of what you were saying take a look at the following, my post 167,
http://www.drmrx.org/forum/showthrea...8970#post48970 and my post 103 in this thread, hoping for a table update...

[maxpower]

Hi Tom and all!

I got about 40.26 dB SNR on a "real world" transmission with a little low cost SDR Device (less than 30 €, Soundcard type SDR & PLL controlled by serial port) that I'm currently developing for HCJB's test transmissions to europe and South America (but, of course, it can be used at any LF/MF & HF frequency, too).

http://www.drmrx.org/forum/attachment.php?attachmentid=42585&d=1215159013

Maybe you can add hat device called "Pappradio" in the list, too?`That would be very nice.


Stephan

[VE3MEO]

Max SNR Table Updated

Congratulations to Friedrich, John and Stephan for those impressive results, the new hardware and keeping the faith.

I apologise if I was slow updating the table. I'm not currently active listening to DRM or any SW so have not been active in the forum. If anyone would like to take over maintenance of the table, I'd be happy to send you the HTML source so you could post it as your own message.

Tom

[mitajohn]

July 06

Hi Tom,

Thanks for the update. On my post 103, in this thread, I forgot to mention the Dream version, which is 1.6.1 cvs.

[simone]

Hi Tom,
please send me the source file of the table and I will keep it updated.
Thanks for your work in the past.
Simone

[mvs sarma]

Hi Tom,

Thanks for the update. On my post 103, in this thread, I forgot to mention the Dream version, which is 1.6.1 cvs.

Hi, John,
Is there any pre-compiled Dream version as update to ver1.6.1.cvs ?

[mitajohn]

July 09

Hi mvs sarma,

You can find the latest here:
edit:
no links to compiled Dream versions on this forum please
Simone

[mvs sarma]

Thanks
John and I shall manage with 1.6.1cvs

[simone]

Highest SNR's over 30 dB achieved with DRMRX/DReaM

added: FritzWue, 41.4 dB using a Flex-5000A Rx


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

English Translation
<tr><td>45.1 dB
<td>Bernd DF9RB 150 km n. of Munich, Germany
<td>Sat-Schneider DRT1
<td>
<td>DReaM 1.3.1cvs
<td>3-el ham Yagi, ALA1530, 30m wire or EWE
<td>Voice of Russia
<td>15780
<td>2005-10-16
<tr><td>42.1 dB
<td>René Schmitz, Bonn, Germany
<td>Elektor custom IF, ADA831 2nd mxr, TUF-1,1st mxr preselector
<td>
<td>DReaM 1.1.6c
<td>5m wire
<td>DW Sines
<td>11830
<td>2005-02-05
<tr><td>41.4 dB
<td>FritzWue DK6QI 52N 07E
<td>Flex-5000A
<td>
<td>DReaM 1.10.8cvs
<td>Inverted L- antenna,20m vertical
<td>BBC&DW
<td>9545
<td>2009-04-10
<tr><td>42.0 dB Euro bonus
<td>FritzWue DK6QI 52N 07E
<td>Sat-Schneider DRT1
<td>
<td>DReaM 1.6.1cvs
<td>80m dipole up 20m
<td>DW
<td>13810
<td>2006-09-09
<tr><td>41.2 dB
<td>Bernd DF9RB 150 km n. of Munich, Germany
<td>TS850 AGC inactive
<td>SA612 ceramic resonator
<td>DReaM 1.1.7c
<td>3-el ham Yagi, ALA1530, 30m wire
<td>Voice of Russia
<td>15780
<td>2005-01-31
<tr><td>40.6 dB
<td>DG9BFC, Barenburg, Germany
<td>IC-765 manual gain
<td>Sat-Schneider xtal
<td>Dream 1.6.1cvs
<td>170m delta loop
<td>DW Sines
<td>13810<td>2006-09-26
<tr><td>40.3
<td>maxpower Oldenburg, Germany
<td>Pappradio dvlpd by Stephan
<td>
<td>DReaM 1.10.6cvs
<td>longwire
<td>DW Moosbrunn
<td>7310
<td>2008-07-04
<tr><td>40.0 dB
<td>df8uo, Karlsruhe, Germany
<td>FT757GX
<td>Sat-Schneider xtal
<td>Dream 1.3c
<td>dipole
<td>VOR
<td>15780<td>2005-10-03
<tr><td>39.1 dB
<td>Digger, CH-5023 Biberstein
<td>FRG7700 + Stabilock 4040 LO
<td>SO42P xtal
<td>Dream 1.6.1cvs
<td>16m LW + 1:1 un-un
<td>DW
<td>13810
<td>2006-09-23
<tr><td>39.1 dB
<td>mitajohn Athens, Greece
<td>Sat-Schneider DRT1
<td>
<td>Dream 1.6.1 cvs
<td>Inverted "L" 9V/16H m
<td>MOI Kuwait
<td>13620
<td>2008-05-11
<tr><td>37.9 dB
<td>simone, Bad Salzschlirf, Germany
<td>FRG100 AGC off
<td>Sat-Schneider
<td>DRMSWR 2.0.34
<td>whip
<td>DW Sines
<td>11830
<td>2005-02-08
<tr><td>37.8 dB
<td>Francois, Petite Rosselle, Fr.
<td>ELAD FDM77 AGC SW + SLOW
<td>
<td>Dream 1.6.1cvs
<td>Twin Zepp
<td>DW
<td>13810
<td>2006-11-17
<tr><td>37.6 dB
<td>hsseppo, Helsinki, Finland
<td>AD8099, AD9551, AD831, 21.4 IF
<td>AD831
<td>DReaM 1.2.5c
<td>5m wire
<td>VoR
<td>15780
<td>2005-06-30
<tr><td>37.5 dB
<td>Han, Netherlands
<td>AOR AR 7030 unmodified
<td>Sat-Schneider
<td>DReaM 1.5cvs
<td>ALA 1530
<td>DW Sines
<td>17700
<td>2006-01-21
<tr><td>36.5 dB
<td>CT1ADT, Sines, Portugal
<td>TS-870 unmodified
<td>11,3 kHz out
<td>DRM 2.0.34
<td>8m vert or 24m dipole
<td>VOR
<td>15780
<td>2004-01-07
<tr><td>36.3 dB
<td>carknue, Frankfurt, Germany
<td>AOR-7030 AGC off
<td>Sat-Schneider xtal
<td>DRMSWR 2.0.34
<td>Wellbrook ALA1530P
<td>DW
<td>5980
<td>2005-10-14
<tr><td>35.9 dB
<td>johnn, Scunthorpe, N.Lincs, UK
<td>DRT-1
<td>
<td>DReaM 1.5cvs
<td>AL1530 loop
<td>DW Sines
<td>17700
<td>2005-12-31
<tr><td>35.9 dB
<td>Funkerberg, Königs Wusterhausen, near Berlin
<td>Elektor
<td>
<td>Dream 1.6.1cvs
<td>10m dipole
<td>DW
<td>5810
<td>2006-03-04
<tr><td>35.6 dB
<td>arniek, Muenster, Germany
<td>FRG-100
<td>Sat-Schneider
<td>DReaM 1.1.1c
<td>homemade loop
<td>DW Sines
<td>5980
<td>2004-10-08
<tr><td>35.2 dB
<td>fibber - Salem, Oregon USA
<td>Yaesu FT-817, 10dB Radio Shack preamp, NCL MW Filter
<td>I5XWW 455k to 12k board
<td>Dream 1.6.1c
<td>80M Dipole
<td>RNW
<td>6130
<td>2008-02-07
<tr><td>34.9 dB
<td>dn0758
<td>elektor
<td>
<td>DRMSWR 2.0.34
<td>Sony AN-1
<td>DW Sines
<td>17800
<td>2004-11-20
<tr><td>34.4 dB
<td>chemclouds, Richmond, Va, USA
<td>Icom IC-R75 AGC off
<td>
<td>DRMSWR 2.0.34
<td>30m inverted-L
<td>CBC Sackville
<td>9800
<td>2004-11-27
<tr><td>34.3 dB
<td>FritzWue DK6QI 52N 07E
<td>FT840
<td>Sat-Schneider
<td>DReaM 1.1.6c
<td>2x 40m LW
<td>DW-Sines
<td>17800
<td>2004-12-18
<tr><td>34.3 dB
<td>Kjell Holen LA6XJ Bergen, Norway
<td>Sat-Schneider DRT1
<td>
<td>DReaM 1.1.7c
<td>70 cm indoor loop
<td>Voice of Russia
<td>12060
<td>2005-01-15 e-mail
<tr><td>34.2 dB
<td>Werner DK8FT
<td>IC R71 AGC off
<td>Sat-Schneider xtal
<td>Dream 1.1.6
<td>4m wire
<td>DW-Sines
<td>17710
<td>2005-02-20 not posted
<tr><td>33.5 dB
<td>johnn, Scunthorpe, N.Lincs, UK
<td>AOR 7030
<td>
<td>DReaM 1.2.4
<td>AL1530 loop
<td>Radio Luxembourg
<td>7145
<td>2005-10-29
<tr><td>33.2 dB
<td>G3VRF, Warwickshire , UK
<td>AD9852 DDS, AD831 Mixer, 2x AD603 IF
<td>12kHz DRM xtal ctld
<td>DReaM 1.1.6c
<td>35cm tuned loop in attic 11m a.g.
<td>DW Sines
<td>11830
<td>2004-11-24
<tr><td>33.2 dB
<td>simone
<td>Coding Tech DWT
<td>
<td>Dream 1.2.3cvs
<td>long wire
<td>Bouquet Flevo NL
<td>7240
<td>2005-07-24
<tr><td>32.5 dB
<td>Bob, St Albans UK
<td>AR88D (60 yrs young!)
<td>Sat-Schneider LC
<td>Dream 1.2.4
<td>Wellbrook LA5030 indoor loop
<td>DW
<td>13790
<td>2005-05-22</td></tr>
<tr><td>32.5 dB
<td>Tom VE3MEO Toronto, Canada
<td>Radio Shack DX-394A no AGC nor 2nd IF fltr
<td>LF-D6 filter/NE612 protoboard
<td>DReaM 1.1.1c
<td>G5RV
<td>CBC Sackville
<td>6140
<td>2004-10-19
<tr><td>32 dB
<td>carknue, Frankfurt, Germany
<td>Coding Tech DWT
<td>
<td>Dream 1.3.1cvs
<td>Degen DE31 Active Loop
<td>DW
<td>5980
<td>2005-10-07
<tr><td>31.2 dB
<td>DRM-OM, 25km SE Karlsruhe, Germany
<td>DRT-1
<td>
<td>Dream 1.6.1cvs
<td>Dressler ara100 active ant.
<td>Radio Luxembourg
<td>7295
<td>2006-04-25
<tr><td>30.7 dB
<td>simone
<td>FRG8800
<td>Sat-Schneider
<td>DRMSWR 2.0.34
<td>whip
<td>DW Sines
<td>15435
<td>2004-10-10
<tr><td>30.4 dB
<td>TimoHannes, Petäjävesi, Finland
<td>elektor
<td>?
<td>DRMSWR 2.0.34
<td>active
<td>DW Sines
<td>17800
<td>2004-11-14
</table> [/B]

[dadalbinder]

List of best results

Hallo,

some thoughts, experiences about the features of the list.

Wolfgang Hartmann, Nürnberg

[mvs sarma]

Hallo,

some thoughts, experiences about the features of the list.

Wolfgang Hartmann, Nürnberg

Thanks for such Nice paper with detailed observations, WolfgangHartmann !!

[dadalbinder]

DRM reception and short time dokumentation

Hallo,

I wrote some notes on the list.

Enclosed You see a diagram worked out by SoDiRa 0.74 on a basis of "3 frames".

Here You can clearly see, that the amplitudes in DRM-transmitting are changing very quickly. More movement as in comparison in a minute-based documentation.

Especially You are able to see, how very fast agc-regulation would destroy the original DRM-signal. On the other hand there is no need of too much agc.

The regulation is done by agc within the decoding programm.

It is very surprising how fast amplitudes change on the way from the transmitter to the receiver. Phase-changings, reflections, .....

There are very fast changings of amplitudes till to 20 dB differences.

Wolfgang Hartmann, Nürnberg