- HOW TO USE VIRTUAL AUDIO CABLE WITH RTL SDR SOFTWARE
- HOW TO USE VIRTUAL AUDIO CABLE WITH RTL SDR SERIES
PCs aren’t the only place these SDRs can be used. Pre-modified dongles are available but you will pay three times the price for the dongle. The crystals on the RTL-SDR dongle can be replaced with higher accuracy temperature controlled crystals (TCXO) that have a variance of 1 ppm! These crystals are $10 but you have to wait for them to ship from China. Shows 162.550 centered with frequency correction applied. Shows the gain and PPM frequency correction of 55 for the dongle I’m using. 162.550 is one of the NOAA Weather Radio frequencies. The actual 162.550 frequency is just to the left of the displayed frequency. The Correct IQ setting will get rid of phantom spikes at lower gain settings. Manually, using more than 32.8 dB will overload and produce duplicate signal spikes. The RTL AGC setting works but will err on the side of too much gain. Gain is obviously another setting that will help you receive signals. The dongle will drift another 2 – 5 PPM over the next 20 – 45 minutes as it warms up. Typical PPM offset is anywhere from 45 – 65 and will be in the programs settings. The center frequency shown will be different from the signal on the scope. To visualize this, use SDRSharp to receive a known FM signal. PPM stands for parts per million and is the difference in received frequency vs. This is obviously not true when you’re dealing with FM signals that are 16 KHz wide or digital at 12.5 where a few KHz will put you on a completely different frequency or channel. They are designed to receive DVB-T signals at a bandwidth of 6 – 8 MHz where a few KHz error doesn’t matter.
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HOW TO USE VIRTUAL AUDIO CABLE WITH RTL SDR SOFTWARE
Then look at some software and projects that transform these into systems that would have cost hundreds or thousands of dollars! PPM and SettingsĪn important thing to know about these dongles: they are cheaply made and not tested for accuracy. We’re going to take a look at key settings you should know about when using these devices. The result is a cheap wideband receiver for your computer. Last time on Dongle Bits, I talked about the $20 European TV tuner dongle that was hacked allowing direct access to the signal data.
HOW TO USE VIRTUAL AUDIO CABLE WITH RTL SDR SERIES
Read the rest of the series in the Dongle Bits articles category. This article appeared in the The Lake Erie Amateur Radio Association newsletter The Spirit of ’76 and ’88 October 2014 edition and The Wood County Amateur Radio Club newsletter CQ Chatter November 2014 edition.