Bob, I am extremely interested in your message concerning the utility for
tuning the RTL2832 dongle, but it is so full of garbage that I cannot make
sense out of it. I cannot tell for sure which = and =20 bits of garbage is
supposed to be a part of the essence of your content and which is pure
garbage. I know the =20 is pure garbage, but some of the other = symbols
around the commands and address are confusing.
Will you please send your message directly to me without going through the
list to see if it gets rid of the garbage? Send it to
[log in to unmask]
TNX, 73,
Ron, K8HSY
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Bob Nicosia WA1KXH
Sent: Thursday, May 07, 2015 11:06 AM
To: [log in to unmask]
Subject: Re: SDR success
Hi all,
Sorry if this may have previously been mentioned on the list. Maybe t=
his is old news.
If you don't mind working with command line programs,=20 this utility,
rtl_fm is completely accessible for tuning the RTL2832 dong=
les.=20
http://kmkeen.com/rtl-demod-guide/index.html
Batch files can be easily written and used for whatever frequency you'd l=
ike to monitor as well as placing the tuner into a scan or search mode.=20=
Quote from Website:
Rtl_fm is a general purpose analog demodulator. It can handle FM, AM and=
SSB. It can scan more than a hundred frequencies a second.=20=20
Here are three script examples to program the tuner:
.
Music on the Radio
.
rtl_fm -M wbfm -f 89.1M | play -r 32k -t raw -e s -b 16 -c 1 -V1 - .
Police Scanner
.
rtl_fm -M fm -f 154.42M -f 154.75M -f 154.82M -f 154.89M -s 12k -g 50 -l =
70 | play
.
Or, for searching a specific range
.
rtl_fm -M am -f 118M:137M:25k -s 12k -g 50 -l 280 | play -r 12k ...
.
Note that these scripts are case sensitive. Use capital M for dash M, mod= e
for example.
Aside from the rtl_fm utility, the SoX, Sound Exchange, application is ne=
eded.=20
I had issues with the latest version 14.4.2, so the earlier version 14.4.=
1 works fine. It can be found here:
.
Download from SourceForge
http://sourceforge.net/projects/sox/files/sox/
sox-14.4.1a-win32.zip
http://sourceforge.net/projects/sox/files/sox/14.4.1/sox-14.4.1a-win32.zi=
p/download
.
After unzipping the file, rename sox.exe to play.exe in order to make the=
Play command work.
As with the other SDR programs, the Zadig USB driver must be installed. I=
nfo and downloads are here:=20 http://zadig.akeo.ie/
.
Guess you could say I'm very pleased with this program. It has its limita=
tions, but they're worth it.
Gud luck.
73, Bob WA1KXH
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