| DRM - Reception logs | Making some tests today... |
---------------
Conclusions for now (Sony ICF2001 + 570E Thinkpad):
- the capacitors I have inserted in the rx-mixer wire have no influence
- everything else unchanged, my Sony ICF2001 signal seems to
give a much lower SNR that my Kenwood.
---------------
08H05, RTL 6095 kHz, 20.9 kbps
Receiver : Sony ICF 2001D on its batteries, Wire Ant 6 meters
Signal level : S9
Computer : IBM Thinkpad 570E on its battery
Ouside Mixer with a 9V battery. (Note: the mixer potentiometer is still
very close to the minimum)
Two 5.6nF capacitors between Sony and Mixer.
>> OK but SNR around 20dB is lower than normal.
>>>>
DRMSoftwareRadio-MERLIN-00000127
Software
Version 2.0.34
Starttime
(UTC) 2004-01-10 08:08:03
Frequency
6095 kHz
Latitude
44°49'N
Longitude
0°38'W
Label
RTL DRM
Bitrate
20.88 kbps
Mode
B
Bandwidth
10 kHz
Comment
ICF2001 + Thinkpad +5N6capa
MINUTE
SNR SYNC AUDIO
TYPE
0000 19 150
1030/10 0 08H08
0001 18 150
720/10 0
0002 19 150
1240/10 0
0003 17 149
730/10 0 08H10 PHOTO
0004 18 150
880/10 0
0005 20 150
1410/10 0
0006 19 150
1340/10 0
0007 19 150
1480/10 0
0008 19 150
1430/10 0
0009 20 150
1490/10 0
0010 19 150
1480/10 0
0011 21 150
1500/10 0
0012 21 129
1100/10 0
At
08H20, replacing the SONY ICF2001D by the Kenwood TS440,
using
the same capacitors connection, just readjusting the
level
potentiometer (on mixer) because TS440 level is lower.
>>>
SNR increases to 25 dB !!
0013 25 150
1490/10 0 08H20
0014 25 150
1470/10 0
0015 25 149
1500/10 0
0016 24 150
1490/10 0 08H23 PHOTO
0017 25 149
1500/10 0
0018 24 149
1490/10 0
0019 23 150
1440/10 0
0020 24 150
1500/10 0
0021 24 148
1500/10 0
0022 24 150
1470/10 0
0023 25 150
1500/10 0 08H30
0024 24 149
1480/10 0
0025 24 150
1500/10 0
0026 24 149
1500/10 0
0027 15 32
230/10 0
08H35 changing back to the Sony
>>> SNR goes down to 21
Note: Seems that connecting the computer soundcard input
to the Sony still brings some noise, even without
computer battery charger.
0028 18 150
1160/10 0 08H35
0029 18 150
1080/10 0
0030 21 150
1430/10 0
0031 21 150
1450/10 0
0032 22 150
1450/10 0
0033 22 151
1500/10 0
0034 21 150
1460/10 0
0035 22 150
1500/10 0
SNR min: 0.0, max: 25.6
CRC:
0xef68
<<<<
08H47
: 21675 (DW Sri Lanka, 11.5 kbps AAC mono), SONY + Thinkpad
>>
No reception, only noise ( PHOTO
8H47 )
08H50
: Changing receiver from Sony to TS440
>>
Now receiving signal but SNR still too low (11 / 12 dB)
>>>>
DRMSoftwareRadio-MERLIN-00000127
Software
Version 2.0.34
Starttime
(UTC) 2004-01-10 08:50:31
Frequency
21675 kHz
Latitude
44°49'N
Longitude
0°38'W
Label
DW DRM
Bitrate
11.48 kbps
Mode
B
Bandwidth
10 kHz
Comment
TS440 + Thinkpad +5N6capa
MINUTE
SNR SYNC AUDIO
TYPE
0000 13 143
0/00 0
0001 13 147
0/00 0
0002 14 147
0/00 0
0003 13 136
0/00 0
08H54
removing the capacitors and connecting directly the
TS440
to the mixer (as usual)- No change
0004 12 148
0/00 0
0005 12 148
0/00 0
0006 12 148
0/00 0
0007 11 150
0/00 0
SNR min: 0.0, max: 16.1
CRC:
0xab02
<<<<
Note:
strange not to have audio, may be they are using
the
old standard (did not check).
09H00
: back on RTL 6095kHz with Sony ICF2001D and Thinkpad,
WITHOUT
the capacitors in the mixer-rx connection
>>
little influence. Level is high but can be adjusted
>>>>
DRMSoftwareRadio-MERLIN-00000127
Software
Version 2.0.34
Starttime
(UTC) 2004-01-10 09:00:18
Frequency
6095 kHz
Latitude
44°49'N
Longitude
0°38'W
Label
RTL DRM
Bitrate
20.88 kbps
Mode
B
Bandwidth
10 kHz
Comment
Sony+ Thinkpad
MINUTE
SNR SYNC AUDIO
TYPE
0000 20 150
1500/10 0
0001 19 149
1410/10 0
0002 19 150
1490/10 0 PHOTO
09H02
0003 19 150
1500/10 0
0004 20 119
1170/10 0
At
9h05, inserting back the capacitors in the mixer-rx
connextion
: No change in level >> seems those capacitors
have
no influence and... are not needed.
0005 19 150
1150/10 0 09H05
0006 20 150
1500/10 0
0007 21 114
1140/10 0
0008 1 24
0/00 0
SNR min: 0.0, max: 21.2
CRC:
0x0c99
<<<<
09H08
my computer battery is empty...
plugging
the mains charger >> much noise, receip not possible.
Changing
to 21675 to see noise influence there :
Still
noise on the Sony receiver, even when soundcard connection
is
not plugged. More when it is connected.
Switching
off the Thinkpad computer (with charger ON) still
brings
strong noise thru the soundcard connection. That noise
decreases
a lot when disconnecting that soundcard input.
The
noise disappears if you unplug the battery charger from
the
PC.
Tests continued HERE
======================================
Thinkpad Computer=
IBM Thinkpad 570E, P2 500 MHz, Win2000, 196 Mo.
Built-in sound card by "Crystal Sound Fusion"
TS440 RX=
TS440 + changed AM filter + AM pickup point + AM mode,
Ant dipole 2x7m on balcony + 5m coax cable .
(My TS440 mod is described here)
Mixer=
SAT-Service crystal mixer 467kHz outside the rx
with a 9v battery,
Netvista computer=
IBM Netvista A30P P4 1.8GHz
built-in soundcard
Sony ICF 2001D=
Direct pickup point as indicated by LA6XJ in DRMRX forum
(pin 7 of IC1 - Photos posted by LA6XJ: ph1,
ph2, ph3)
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