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PostPosted: Wed Oct 17, 2007 2:51 am 
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location: Kangasala, Finland
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?

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Jari-Matti

MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB


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PostPosted: Sat Oct 20, 2007 6:13 am 
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Joined: Wed Mar 03, 2004 7:43 pm
Posts: 748
Location: Sydney, Australia
In LiveTV, F7 used to display signal strength on cards that support it.

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| Nigel Pearson, nigel.pearson.au@gmail.com
| "Things you own end up owning you" - Tyler, Fight Club


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 Post subject: DTVSIGNAL
PostPosted: Sat Oct 20, 2007 10:57 am 
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Joined: Tue Mar 28, 2006 8:26 pm
Posts: 804
Location: Minneapolis, MN
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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KnoppMyth R5.5, Asus A8N-VM CSM (nvidia 6150 onboard video), AMD Athlon 64 dual-core 4200+, two 1GB sticks DDR 400, HD-3000 HDTV card, PVR-150 card, Iguanaworks RS-232 IR receiver/transmitter, Pioneer DVR-110 DVD burner


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