DL7APV Pulsare detection

B0809+74

Bandwidth 2,2MHz with RTL-dongle and IW5BHY software Tempo for recording and folding and presto folding after conversion

Bandwidth 10MHz with airspy SDR and Presto Software for recording and folding

Recorded File:

After conversion: B0809+74_win.fil

Recorded File

After conversion: b0809+74.fil

Record date: 2021 sept 12 Start 20:05 UTC 6h

Local antenna direction from Az/EL 0°/38° to 25°/74°

RTL settings:

Frequenz : 431.200 MHz, Gain 40dB

-s 2048000

Bin2fil data:

Rfifind -o mask -time 1 -timesig 4 -freqsig 37 -chanfrac 1 -intfrac 1

Airspy settings:

rec_gui:

ACQ time (s)	21600
Sample rate	10MSPS (airspy)
SR time series	2KSPS
Num chan	25
Frequency (MHz)	433.5
RF gain (dB)	30
IF Gain (dB)	9
BB gain	0
DIG gain	2
Bin2fil settings:
Conv start	0
Length	21600
Ampli	2
Filt H	12
Filt L	0.08
Filter typ	Bessel
Source name
DEC
RA
Center frequency (MHz)	433.5
SR	10MSPS (airspy)
SR error (ppm)	0
SR time series	2KSPS
Channels	25

Rfifind -o mask -time 1 -timesig 4 -freqsig 37 -chanfrac 1 -intfrac 1

Quiet with qrm in the middle and the typical electrical fence from neighbor

As in most cases the DM curve is much better as with the 2MHz recording

Here the 2Mhz win recording is much better as S/N with 10Mhz, I guess due to qrm

less S/N as the 2MHz recording

Older recordings with 2MHz

and 1h observation time

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Last update sept 2021