Архив за 21.05.2019

How to wire RTL-SDR USB dongle to AM radio antenna

I want to receive air band and I have noolec USB dongle with the small antenna and I have an antenna from old stereo player. I'd like to know how to connect the wires.

Thanks

submitted by /u/bdaaary420
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Что ещё слышно в радиоэфире? Радиовещание на КВ (DXing)…

Что ещё слышно в радиоэфире? Радиовещание на КВ (DXing)
Что ещё слышно в радиоэфире? Радиовещание на КВ (DXing)

Comment on Manual Installation of SDR# by Dude who can’t get it right

I’ve tried every trick I can find here. I can’t get the bat file to load peoperly. Zadig has 0 bytes in it and won’t run because of this. I tried to download the stuff manually and still no joy. I can see why people are getting frustrated. I’m beginning to wonder if its worth it myself.

How to make cheap/easy/small/quick DIY RTL-SDR antenna to receive weather data from NOAA satellites (137 MHz) region?

Looking for an antenna that's small/portable/holdable, cheap, and easy to make. It doesn't need to be the best quality, I'd just like something that works. Don't have access to a solder. I do have coaxial cable, aluminum foil, coat hangars, other household items, etc. I looked at some coat hangars/aluminum foil/pizza plate antennas but they all are either way too big (mounting required) or require soldering. Just looking for something simple and easy that requires little skill/time. I don't want to buy one either. I just want the satisfaction of building something menial and getting a signal. Is there any design that suits this? Thanks.

Edit: This looked interesting. https://www.rtl-sdr.com/simple-noaameteor-weather-satellite-antenna-137-mhz-v-dipole/ I don't have aluminum rods but I could get some, but I have no idea what a "choc block" is. Amazon searches confuse me further. I'm looking for something simpler than this ideally.

submitted by /u/xMicro
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NOAA FM Receiver python code line by line (Explanation)

Hello, I need you to explain me the code lines of an FM receiver in GNU Radio Companion.

#!/usr/bin/env python2

# -*- coding: utf-8 -*-

##################################################

# GNU Radio Python Flow Graph

# Title: Top Block

# Generated: Sun Mar 31 21:34:11 2019

##################################################

if __name__ == '__main__':

import ctypes

import sys

if sys.platform.startswith('linux'):

try:

x11 = ctypes.cdll.LoadLibrary('libX11.so')

x11.XInitThreads()

except:

print "Warning: failed to XInitThreads()"

from gnuradio import analog

from gnuradio import audio

from gnuradio import eng_notation

from gnuradio import filter

from gnuradio import gr

from gnuradio import wxgui

from gnuradio.eng_option import eng_option

from gnuradio.fft import window

from gnuradio.filter import firdes

from gnuradio.wxgui import fftsink2

from gnuradio.wxgui import waterfallsink2

from grc_gnuradio import wxgui as grc_wxgui

from optparse import OptionParser

import osmosdr

import time

import wx

class top_block(grc_wxgui.top_block_gui):

def __init__(self):

grc_wxgui.top_block_gui.__init__(self, title="Top Block")

_icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png"

self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY))

##################################################

# Variables

##################################################

self.samp_rate = samp_rate = 2048000

self.freq = freq = 102.3e6

##################################################

# Blocks

##################################################

self.wxgui_waterfallsink2_0 = waterfallsink2.waterfall_sink_c(

self.GetWin(),

baseband_freq=freq,

dynamic_range=100,

ref_level=0,

ref_scale=2.0,

sample_rate=samp_rate,

fft_size=512,

fft_rate=15,

average=False,

avg_alpha=None,

title='Waterfall Plot',

)

self.Add(self.wxgui_waterfallsink2_0.win)

self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(

self.GetWin(),

baseband_freq=freq,

y_per_div=10,

y_divs=10,

ref_level=0,

ref_scale=2.0,

sample_rate=samp_rate,

fft_size=1024,

fft_rate=15,

average=False,

avg_alpha=None,

title='FFT Plot',

peak_hold=False,

)

self.Add(self.wxgui_fftsink2_0.win)

self.rtlsdr_source_0 = osmosdr.source( args="numchan=" + str(1) + " " + '' )

self.rtlsdr_source_0.set_sample_rate(samp_rate)

self.rtlsdr_source_0.set_center_freq(freq, 0)

self.rtlsdr_source_0.set_freq_corr(0, 0)

self.rtlsdr_source_0.set_dc_offset_mode(2, 0)

self.rtlsdr_source_0.set_iq_balance_mode(0, 0)

self.rtlsdr_source_0.set_gain_mode(True, 0)

self.rtlsdr_source_0.set_gain(10, 0)

self.rtlsdr_source_0.set_if_gain(20, 0)

self.rtlsdr_source_0.set_bb_gain(20, 0)

self.rtlsdr_source_0.set_antenna('', 0)

self.rtlsdr_source_0.set_bandwidth(0, 0)

self.rational_resampler_xxx_1 = filter.rational_resampler_fff(

interpolation=198,

decimation=200,

taps=None,

fractional_bw=None,

)

self.rational_resampler_xxx_0 = filter.rational_resampler_ccc(

interpolation=1,

decimation=4,

taps=None,

fractional_bw=None,

)

self.low_pass_filter_0 = filter.fir_filter_ccf(1, firdes.low_pass(

100, samp_rate, 100e3, 1.024e6, firdes.WIN_HAMMING, 6.76))

self.audio_sink_0 = audio.sink(48000, '', True)

self.analog_wfm_rcv_0 = analog.wfm_rcv(

quad_rate=500e3,

audio_decimation=10,

)

##################################################

# Connections

##################################################

self.connect((self.analog_wfm_rcv_0, 0), (self.rational_resampler_xxx_1, 0))

self.connect((self.low_pass_filter_0, 0), (self.analog_wfm_rcv_0, 0))

self.connect((self.rational_resampler_xxx_0, 0), (self.low_pass_filter_0, 0))

self.connect((self.rational_resampler_xxx_1, 0), (self.audio_sink_0, 0))

self.connect((self.rtlsdr_source_0, 0), (self.rational_resampler_xxx_0, 0))

self.connect((self.rtlsdr_source_0, 0), (self.wxgui_fftsink2_0, 0))

self.connect((self.rtlsdr_source_0, 0), (self.wxgui_waterfallsink2_0, 0))

def get_samp_rate(self):

return self.samp_rate

def set_samp_rate(self, samp_rate):

self.samp_rate = samp_rate

self.wxgui_waterfallsink2_0.set_sample_rate(self.samp_rate)

self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate)

self.rtlsdr_source_0.set_sample_rate(self.samp_rate)

self.low_pass_filter_0.set_taps(firdes.low_pass(100, self.samp_rate, 100e3, 1.024e6, firdes.WIN_HAMMING, 6.76))

def get_freq(self):

return self.freq

def set_freq(self, freq):

self.freq = freq

self.wxgui_waterfallsink2_0.set_baseband_freq(self.freq)

self.wxgui_fftsink2_0.set_baseband_freq(self.freq)

self.rtlsdr_source_0.set_center_freq(self.freq, 0)

def main(top_block_cls=top_block, options=None):

tb = top_block_cls()

tb.Start(True)

tb.Wait()

if __name__ == '__main__':

main()

submitted by /u/YorbelBaez
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How to use Audacity to make NOAA satellite signal quality better post-recording?

Recently recorded NOAA 19 with a DIY radio antenna with RTL-SDR. I have the audio file now, and I trimmed out the parts that had no audio, and amplified the audio with Audacity, but there's still no visible image (mostly just static) on WXtoIMG. I tested audio files from the internet and it worked fine, so I know it's setup right (I have the right frequencies and hear beeps and everything). But, there's a lot of static that I'm trying to reduce. I'm playing around with the noise reduction feature now. I noticed that if the sensitivity it set too low, then the signal when it's beeping is great, but there's a lot of additional noise interference that gets generated. Trying to find the optimal settings for noise reduction, sensitivity, and frequency blending. Does anyone know if using this feature in Audacity can salvage a staticky audio file? Or is there some other feature I can do. Thanks. Here's some images of what I'm seeing. Also, what's the ideal audio file length in time?

My audio file, amplified (noise reduction not on): https://prnt.sc/nriz0a

My spectrogram: http://prntscr.com/nrizje

My uncut, unmodified audio file for reference (maybe you can fix it?): https://drive.google.com/open?id=14ZhW8vNK2zNMTCvBtF0x0ZJDQP7FEkpw

Test spectrogram from internet: http://prntscr.com/nrizq5

Test audio file from internet: http://prntscr.com/nrj082

Test audio file for reference: https://drive.google.com/open?id=1yxcEmkzJHotepZWPOkEOGVP65MKS7WAr

Thanks

submitted by /u/xMicro
[link] [comments]

Rtlsdr distribution for raspberry pi

Hello,

A friend of mine gave me as a gift for my bitrhday a raspberry pi 3 b+. I would like to use it with the rtl-sdr v3 dongle.

My question is: does exist a distribution for raspberry pi ready to use for the rtl-sdr? I know that it exists for the rsp1a but i don't know if it works for the rtl-sdr too.

I am open to every kind of raccomandation :) Thank you

submitted by /u/jekko76
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Cloudy/overcast over Chicago — GOES16

Cloudy/overcast over Chicago - GOES16 submitted by /u/Oxffff0000
[link] [comments]

Troubleshooting Help • Re: SDR# crashes when starting to record «Baseband»

Thank you for the answer!

The folder had writing permissions. I think I managed to reinstall the runtimes (but I'm not sure about that :D ).
It didn't change the problem. Sometimes recording baseband even worked. But trying it again with exactly the same settings made sdrsharp close again.

I changed to another recording plugin which worked fine, so the problem is not mine anymore.

Statistics: Posted by phoebus — Tue May 21, 2019 4:37 pm


How to ground an SDR?

Hello. I am having issues with grounding of my RTL-SDR V3 dongle. I mostly use it outside with my laptop, but that means that no part of the setup is in a contact with the ground - the antenna is on a wooden pole, and the laptop on a plastic stool.

I recently noticed that there seems to be charge building up on the coax from a nearby transmission line, and that if I use some metal object to press the coax on the dirt the noise floor shifts down a lot.

Also, when I use the touchpad of the laptop, it messes with the noise floor, as well as me just walking around it. Is there a way to ground the SDR to prevent such issues? I am thinking about just taking the -5V line of one of the USB ports and literally running it into the earth

submitted by /u/derekcz
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