You have to set the volume in Windows to about half. I have added a sample for you here so you know exactly what to listen for. You will know you are getting the signal right when you hear a clear high pitched tone with a clear tick tock sound on it. The frequency will also shift as the pass progresses so you may have to open the laptop and adjust the frequency slightly and resume. You will have to move it around at times. Press record in Audacity, close the laptop and hold up the aerial for the duration of the pass. As the satellite approaches, move the antenna about until the signal begins to show and click in the middle of the signal trace on the waterfall spectrum as it shows on SDR Sharp. Start off with the laptop on the ground and the radio set to 137.9125. In Audacity, the recording device must be set to stereo mix and the sample rate set to 11025. To begin, you need to have audacity open along with SDR Sharp.
These spikes may be caused by the radio itself or USB power supply noise. It struggles with other satellites because there are noise spikes near the NOAA 19 and NOAA 15 frequencies. I find that my radio picks up NOAA 18 the best so go here to track it: The mode should be set to NFM and the squelch off. You have to uncheck filter audio and you must set the bandwidth to 36 KHz. In SDR Sharp, you have to set the front end option to your software radio. To set up the software so it detects the radio, you need to copy rtlsdr.dll into the same directory as SDR Sharp.Ī better guide will be included with your radio or you can find it online. Once you have the software at the right frequency, you close the laptop, hold it in your left arm and hold the antenna pole with your right hand until you can hear the satellite. The other end of the wire is attached to the other end of the pole a bit like a fishing rod. You simply have to secure the wire to the central pin of the coaxial connection by soldering or making up your own connection. I also covered it in foil which can help block noise in some cases.
I have modified my software radio that I bought by removing the existing connector and attaching a coaxial socket instead. If you do this, the USB cable sometimes causes noise and signal loss so it is best to have the radio plugged directly into the laptop.įinally, if you have really enjoyed this or found it useful, please consider making a tiny donation trough Paypal here: You can connect your radio to a USB extension cable and just hold the radio in your hand rather than having a laptop under your arm. You can search Google for this.Ī small laptop computer that you can hold for 15 minutes at a time. It seems to lose sensitivity to the signals over time. It does not pick up weather satellites at all any more but it still picks up everything else very well. I have discovered a problem with this radio. This will show you how to download weather satellite images really cheaply and easily using easy to obtain parts.
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