Frequency scan

In order to be able receive a particular signal with your TV tuner device you will need to tune/set it to the correct radio frequency used by that source transmission. Therefore, you (or, at least, the viewing application you are using) will first want to know which frequencies are used for transmission and thereby are tunable for your receiver at your location of residence. Frequency scanning utilities, listed below, perform such signal detection and, generally, provide a list of the frequencies upon which content is discovered, with which higher level applications can then in turn use for tuning purposes.

Note: Historically, the set of frequencies used under the older analogue systems have differed from one another, meaning that the particular frequencies used across North America, Europe, Asia, etc., etc., will differ depending upon the transmission standard adopted within each nation. When countries began to make the transition to digital TV systems, most have opted to continue to use their old channel frequency schemes so as to make the switch from analog to digital systems as seamless as possible for the end user.

Frequency Scanning Utilities

Analog

• scantv (part of xawtv package)
• apps with built in scanning ... tvtime, xawtv/motv (which call upon scantv), kdetv ...

Digital

One of the handiest tools for scanning frequencies is "(dvb)scan", a utility included within the LinuxTV dvb-apps package. (dvb)scan parses the information from a pre-configured initial scan file that is specific to a particular country/region/location/service_provider (many of which are contained within the dvb-apps package as well as being available within the wiki or elsewhere), then tunes into the frequencies and lists the names for all available PIDs.

• dvbscan/scandvb/atscscan
• scan
• w_scan
• scan-s2 [1]
• apps with built in scanning ... kaffeine, MythTV, Me TV

Comparison of DVB frequency scanning commandline utilities

Note: The differences between scan and dvbscan should be added to this wiki article. The information for dvbscan is still to be completed - please help.

command line frequency scanners comparison

The following table lists the main features of the different command line scanners. For specific information on usage, have a look at its specific wiki article.

feature \ scanner	scan	dvbscan	w_scan	scan-s2
analog / digital	digital TV only	digital TV only	digital TV only	digital TV only
download	linuxtv.org/hg/dvb-apps	linuxtv.org/hg/dvb-apps	wirbel.htpc-forum.de/w_scan/index.html	mercurial.intuxication.org/hg/scan-s2
last stable	linuxtv-dvb-apps-1.1.1 (outdated, May 2006)	?	none / use latest version	none / use latest version
comments	linuxtv.org maintained DVB-S2 support missing needs dvb driver with API-3.2 or 5.x	linuxtv.org maintained	compiling needs dvb driver with API-5.0 or higher usage needs API-3.2 or API-5.x	needs dvb driver with 5.0 or higher
supported DTV types	DVB-S, DVB-C(Europe), DVB-T, ATSC (VSB and QAM), DMB-TH (China)	?	DVB-S, DVB-S2, DVB-C(Europe), DVB-T, ATSC (VSB and QAM), DMB-TH (China)	DVB-S, DVB-S2, DVB-C(Europe), DVB-T, ATSC (VSB and QAM)
initial scan file required (matching to your satellite or local aerial/cable network)	yes (use dvb-apps hg from linuxtv.org)	yes (use dvb-apps hg from linuxtv.org)	not required	yes (use dvb-apps hg from linuxtv.org) NOTE: slightly different file format from scan because of additional DVB-S2 support.
can generate initial scan file	no	no	yes	no
can generate channels.conf for zap/xine/mplayer/vlc	yes (default)	?	yes	yes
can generate channels.conf for VDR	yes (vdr-1.3 only)	?	yes (default)	yes (default)
can generate channels.dvb for kaffeine	no	?	yes	no

External Links

Analog

Digital For some other general sources (which may or may not be that useful) for finding local channel frequency lists, see:

• http://www.vdr-wiki.de/wiki/index.php/Kanal_DVB-T - DVB-T channels in Europe
• http://www.wohnort.demon.co.uk/DAB/
• http://www.digitalspy.co.uk/terrestrial/tuning/