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How do I measure signal strength of DVB-T?
http://forum.linhes.org/viewtopic.php?f=15&t=17001		 Page 1 of 1
Author:  auttila [ Wed Oct 17, 2007 2:51 am ]
Post subject:  How do I measure signal strength of DVB-T?
My R5E50 & Technotrend cards have been very tolerant about the bad DVB-T reception at our neighbourhood. The signal strength is somewhere between 55% - 65%. Now, during the autumn, the rains propably take the extra bit off, and the signal strength drops below 50%, and the video will pixelize badly. So it's time to get an aplifier.

However, I would like to measure the signal strength via command line utility, so I could post that on my web page (and RRD it...) I tried using scan and tzap, but couldn't quite figure out how it's done. Does anyone have any tips?

Also, Is there a way to get the signal strength visible in MythTV screen?
Author:  nigelpearson [ Sat Oct 20, 2007 6:13 am ]
Post subject: 
In LiveTV, F7 used to display signal strength on cards that support it.
Author:  neutron68 [ Sat Oct 20, 2007 10:57 am ]
Post subject:  DTVSIGNAL
There is a command line tool that will give real-time signal strength. I'm using it with a pchdtv HD-3000 DVB-T card. It may work with your card too.
It's a program called DTVSIGNAL. You need to download, compile and install it yourself because it isn't in current Knoppmyth versions.
I used the following commands to get in on my R5F1 system:
Code:
cd /usr/src
wget http://pchdtv.com/downloads/dvb-atsc-tools-1.0.7.tgz
tar -zxvf dvb-atsc-tools-1.0.7.tgz
cd /usr/src/dvb-atsc-tools-1.0.7
make
make install

When you want to use the command line scanner:

1. stop your Mythtv backend (use ALT-2 from the Mythtv GUI or type "/etc/init.d/mythtv-backend stop" from a command line logged in as root).
2. From a command line, type "dtvsignal ##" where ## is the channel number you want to get a signal strength reading on
3. when done, restart the backend (use ALT-3 from the Mythtv GUI or type "/etc/init.d/mythtv-backend start" from a command line logged in as root).

You get results like the referenced screen shot.
Image

Good luck!
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