DL7APV Pulsare detection

 

B1508+55

 

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: B1508+55_win.fil

Recorded File

After conversion: b1508+55.fil

 

Record date: 2021 aug 23 Start 18:00 UTC 6h

Local antenna direction from Az/EL 291/74 to 325/30

 

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)

7

BB gain

0

DIG gain

2

 

 

Bin2fil settings:

 

Conv start

0

Length

21600

Ampli

2

Filt H

50

Filt L

0.05

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 typical electrical fence from neighbor

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

Nearly same S/N as in folding before

 

Much better S/N as the 2MHz value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Older recordings with 2MHz

and 1h observation time

 

 

Still some drift in beginning due at the RTL/software

Good detection

With S/N 22,4

Now with Airspy and 10MHz BW

The 10MHz recording looks much better as with 2MHz

But S/N is only a bit better as with 2MHz BW

1 Try :

 

 

 

 

 

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Last update august 2021