<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body>Hi, Greg.
<div><br></div><div>One of the users of my software pulled this stunt to use an RTL_SDR dongle. See if this (with appropriate adjustments) works for you.</div><div><br></div><div>https://blog.pwarren.id.au/tech/2014/02/11/APRS-to-YAAC.html</div><div><br></div><div>I make no guarantees; I haven't tried it myself yet.</div><div><br></div><div>Andrew, KA2DDO</div><div>author of YAAC</div><br><br>-------- Original message --------<br>From: Greg D <ko6th.greg@gmail.com> <br>Date: 8/12/19 00:42 (GMT-05:00) <br>To: TAPR APRS Mailing List <aprssig@lists.tapr.org> <br>Subject: [aprssig] Help needed: APRS receive with RTL_SDR and Direwolf <br><br>Hi folks,<br><br>I'm trying to set up a "quick" receive iGate with a Raspberry Pi, an<br>RTL_SDR dongle, and Direwolf. No joy as yet. However, when I run the<br>SDR dongle as a server with rtl_tcp and aim GQRX at it with its internal<br>packet decoder tool, that decodes just fine. Direwolf also works fine<br>with a USB sound card and a cell phone mike near my HT, so I'm guessing<br>the issue is with rtl_fm. What setting have I bungled or missed in<br>doing this?<br><br>The run string I'm using is this, or variations on the theme (I've tried<br>a bunch of different stuff, without luck).<br><br>$ rtl_fm -f 144.39M -M nbfm -E offset 0 -g 11 -p 60 -r 24000 - |<br>direwolf -c direwolf.sdr.conf -r 24000 -p -D 1 -<br><br>Here's what it displays. Note the error from line 155 also is seen when<br>running Direwolf from a sound card, and that decodes just fine, so I<br>don't think it's a problem with the Direwolf config. And, yes, it is an<br>old version of Direwolf, but for reasons too convoluted to go into here,<br>that's what I've got.<br><br>Dire Wolf version 1.0a<br>Line 155: Missing tone frequency for space.<br>Audio input device for receive: stdin<br>Audio out device for transmit: null<br>Found 1 device(s):<br> 0: Generic, RTL2832U, SN: 77771111153705700<br><br>Using device 0: Generic RTL2832U<br>Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, A, 24000 sample rate.<br>Note: PTT not configured for channel 0.<br>Virtual KISS TNC is available on /dev/pts/0<br>WARNING - Dire Wolf will hang eventually if nothing is reading from it.<br>Created symlink /tmp/kisstnc -> /dev/pts/0<br>Ready to accept KISS client application on port 8001 ...<br>Ready to accept AGW client application on port 8000 ...<br>Found Rafael Micro R820T tuner<br>Tuner gain set to 12.50 dB.<br>Tuner error set to 60 ppm.<br>WARNING: Failed to set offset tuning.<br>Tuned to 144390000 Hz.<br>Oversampling input by: 42x.<br>Oversampling output by: 1x.<br>Buffer size: 8.13ms<br>Exact sample rate is: 1008000.009613 Hz<br>Sampling at 1008000 S/s.<br>Output at 24000 Hz.<br><br>Now connected to IGate server noam.aprs2.net (206.12.104.38)<br>Check server status here http://206.12.104.38:14501<br><br>[ig] # aprsc 2.1.4-g408ed49<0x0d><0x0a><br>[ig] # logresp KO6TH-8 verified, server T2BC<0x0d><0x0a><br>[ig] KO6TH-8>APDW10:!3857.53N\12106.64W&<br><br>and nothing after that... Even with my TH-D74 in the same room, on EL<br>power so as to not crush the input.<br><br>_______________________________________________<br>aprssig mailing list<br>aprssig@lists.tapr.org<br>http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org<br></body></html>