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<div style="font-family: Consolas; font-size: medium;">Hi All,</div>
<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space:pre"></span>I changed this thread subject to match more closely to my issue.</div>
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<div style="font-family: Consolas; font-size: medium;">On Sat, 22 Mar 2014 04:58:04 +1030, Mark Perkins <<a href="mailto:perkins1724@hotmail.com">perkins1724@hotmail.com</a>></div>
<div style="font-family: Consolas; font-size: medium;">wrote:</div>
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<div>When you tune to SBS HD it would be interesting to know what the reported</div>
<div>signal strength on that channel is. It flashes up for a few seconds on</div>
<div>first tune otherwise press alt-F7 (according to the key bindings wiki,</div>
<div>although it wouldn't work for me). It's not a definitive signal strength</div>
<div>but would be interesting.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I couldn't get alt-F7 to bring up the signal meter either. I even tried</div>
<div style="font-family: Consolas; font-size: medium;">changing the binding to a plain old underscore but still no joy.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I get SBS 1 at about 75% to 76% according to the signal monitor that</div>
<div style="font-family: Consolas; font-size: medium;">briefly flashes up when I change channels from a different multiplex.</div>
<div style="font-family: Consolas; font-size: medium;">Unfortunately, when I select SBS HD it does that weird thing and tunes to</div>
<div style="font-family: Consolas; font-size: medium;">SBS 1 instead so I can't tell you what mythtv signal level SBS HD is</div>
<div style="font-family: Consolas; font-size: medium;">getting for the moment. The worst signal I get is 72% for some of the</div>
<div style="font-family: Consolas; font-size: medium;">Seven network channels. SBS HD does succeed in tuning to it's HD channel on occasion just not when I'm composing emails about it ;^)</div>
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<div>Based on a recent thread I noted that mythtv only keeps the last</div>
<div>frequency scanned for a channel. Plus antennas often work reasonably well</div>
<div>backwards, so given you mentioned pointing north to Bouddi I wondered</div>
<div>whether the signal from Sydney (south) might be higher frequency. However</div>
<div>they are both the same 571.5MHz (referring to SBS). But this is not the</div>
<div>frequency from your MySQL-foo below (599.5MHz). I did a bit of googling</div>
<div>and found that SBS transmit on 599.5MHz from Newcastle, which at a guess</div>
<div>is going to be exactly where your antenna is pointing (north), just much,</div>
<div>much, much further away and therefore much weaker.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I live at Church Point and there©ös a hill behind the house that does a</div>
<div style="font-family: Consolas; font-size: medium;">pretty effective job of blocking any signals coming from the South or West.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I've never known which transmitter I am actually tuned to but I do get</div>
<div style="font-family: Consolas; font-size: medium;">Newcastle news and advertising content so it must be one of the</div>
<div style="font-family: Consolas; font-size: medium;">transmitters to the North of me.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>Newcastle appears to be a far more powerful transmitter than Bouddi or</div>
<div style="font-family: Consolas; font-size: medium;">Gosford. Newcastle is 250kW as opposed to Bouddi 650W-1.25kW and Gosford's puny</div>
<div style="font-family: Consolas; font-size: medium;">330W. So I guess it's a question of how much the Newcastle signal degrades</div>
<div style="font-family: Consolas; font-size: medium;">compared to the nearer Bouddi and Gosford transmitters.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>If I do try to dvbscan using any of:</div>
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<div style="font-family: Consolas; font-size: medium;">/usr/share/dvb/dvb-t/au-Sydney_North_Shore</div>
<div style="font-family: Consolas; font-size: medium;">/usr/share/dvb/dvb-t/au-Sydney_Kings_Cross</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>No channels are found due to the hill methinks.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I tried to make up my own au-bouddi and au-gosford dvbscan files but only</div>
<div style="font-family: Consolas; font-size: medium;">got successful tuning to the ABC channels which share frequencies with the</div>
<div style="font-family: Consolas; font-size: medium;">Newcastle transmitter. In fact, the Bouddi and Gosford transmitters have</div>
<div style="font-family: Consolas; font-size: medium;">completely identical frequencies according to <a href="http://ozdigitaltv.com/">http://ozdigitaltv.com</a>:</div>
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</div>
<div style="font-family: Consolas; font-size: medium;">Gosford Digital TV Channels at North Gosford</div>
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</div>
<div style="font-family: Consolas; font-size: medium;">Affiliation<span class="Apple-tab-span" style="white-space: pre;">
</span>Callsign<span class="Apple-tab-span" style="white-space: pre;"> </span>Frequency<span class="Apple-tab-span" style="white-space: pre;">
</span>Power (ERP)<span class="Apple-tab-span" style="white-space: pre;"> </span>
Pattern<span class="Apple-tab-span" style="white-space: pre;"> </span>Polarisation<span class="Apple-tab-span" style="white-space: pre;">
</span>Coverage</div>
<div style="font-family: Consolas; font-size: medium;">Map</div>
<div style="font-family: Consolas; font-size: medium;">SBS<span class="Apple-tab-span" style="white-space: pre;">
</span>SBS34<span class="Apple-tab-span" style="white-space: pre;"> </span>571.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>sbs.com.au</div>
<div style="font-family: Consolas; font-size: medium;">ABC<span class="Apple-tab-span" style="white-space: pre;">
</span>ABC37<span class="Apple-tab-span" style="white-space: pre;"> </span>592.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>abc.net.au</div>
<div style="font-family: Consolas; font-size: medium;">Seven<span class="Apple-tab-span" style="white-space: pre;">
</span>NEN59<span class="Apple-tab-span" style="white-space: pre;"> </span>746.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Seven<span class="Apple-tab-span" style="white-space: pre;">
</span>ATN61<span class="Apple-tab-span" style="white-space: pre;"> </span>760.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Nine<span class="Apple-tab-span" style="white-space: pre;">
</span>TCN62<span class="Apple-tab-span" style="white-space: pre;"> </span>767.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Ten<span class="Apple-tab-span" style="white-space: pre;">
</span>TEN65<span class="Apple-tab-span" style="white-space: pre;"> </span>788.625 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Nine<span class="Apple-tab-span" style="white-space: pre;">
</span>NBN68<span class="Apple-tab-span" style="white-space: pre;"> </span>809.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>330.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Omnidirectional<span class="Apple-tab-span" style="white-space: pre;">
</span>Horizontal<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
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<div style="font-family: Consolas; font-size: medium;">Bouddi Digital TV Channels at Bouddi</div>
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</div>
<div style="font-family: Consolas; font-size: medium;">Affiliation<span class="Apple-tab-span" style="white-space: pre;">
</span>Callsign<span class="Apple-tab-span" style="white-space: pre;"> </span>Frequency<span class="Apple-tab-span" style="white-space: pre;">
</span>Power (ERP)<span class="Apple-tab-span" style="white-space: pre;"> </span>
Pattern<span class="Apple-tab-span" style="white-space: pre;"> </span>Polarisation<span class="Apple-tab-span" style="white-space: pre;">
</span>Coverage</div>
<div style="font-family: Consolas; font-size: medium;">Map</div>
<div style="font-family: Consolas; font-size: medium;">SBS<span class="Apple-tab-span" style="white-space: pre;">
</span>SBS34<span class="Apple-tab-span" style="white-space: pre;"> </span>571.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>1.27 kW<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>sbs.com.au</div>
<div style="font-family: Consolas; font-size: medium;">ABC<span class="Apple-tab-span" style="white-space: pre;">
</span>ABC37<span class="Apple-tab-span" style="white-space: pre;"> </span>592.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>1.25 kW<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>abc.net.au</div>
<div style="font-family: Consolas; font-size: medium;">Seven<span class="Apple-tab-span" style="white-space: pre;">
</span>NEN59<span class="Apple-tab-span" style="white-space: pre;"> </span>746.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>650.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Seven<span class="Apple-tab-span" style="white-space: pre;">
</span>ATN61<span class="Apple-tab-span" style="white-space: pre;"> </span>760.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>1.27 kW<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Nine<span class="Apple-tab-span" style="white-space: pre;">
</span>TCN62<span class="Apple-tab-span" style="white-space: pre;"> </span>767.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>1.27 kW<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Ten<span class="Apple-tab-span" style="white-space: pre;">
</span>TEN65<span class="Apple-tab-span" style="white-space: pre;"> </span>788.625 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>1.27 kW<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
<div style="font-family: Consolas; font-size: medium;">Nine<span class="Apple-tab-span" style="white-space: pre;">
</span>NBN68<span class="Apple-tab-span" style="white-space: pre;"> </span>809.500 Mhz<span class="Apple-tab-span" style="white-space: pre;">
</span>650.00 W<span class="Apple-tab-span" style="white-space: pre;"> </span>Directional<span class="Apple-tab-span" style="white-space: pre;">
</span>Vertical<span class="Apple-tab-span" style="white-space: pre;"> </span>¡©</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>So it looks like I'm picking up Newcastle in preference to either Gosford</div>
<div style="font-family: Consolas; font-size: medium;">or Bouddi since I cannot tune to any of the above frequencies except the</div>
<div style="font-family: Consolas; font-size: medium;">ABC (592.500MHz) and it's shared by all three.</div>
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<div>If you know that Bouddi should definitely be your strongest signal then</div>
<div>use <a href="http://ozdigitaltv.com/">http://ozdigitaltv.com</a> to get the exact frequencies you need and then</div>
<div>only do partial scans on those. Alternatively, if you've got the time</div>
<div>selectively scan the frequencies on all your possible transmitters and</div>
<div>see which is going to be the strongest. I believe that the reported</div>
<div>signal strength number may not be particularly accurate as an absolute</div>
<div>number but is excellent for relative comparisons (ie which signal is</div>
<div>stronger as reported by the tuner).</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I am not really as concerned about which transmitter has the strongest</div>
<div style="font-family: Consolas; font-size: medium;">signal (and my guess is that it©ös Newcastle) but more about why my mythtv</div>
<div style="font-family: Consolas; font-size: medium;">SBS HD channel seems to switch to SBS 1 sometimes.</div>
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<div>Given you may be receiving weak signals from quite a number of</div>
<div>transmitters given your location and that mythtv only keeps the highest</div>
<div>frequency then I suspect that selective scanning will be the way to go</div>
<div>and will clear a lot of this up.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I know my signals are relatively weak, 72% to 76%, as I've had a few</div>
<div style="font-family: Consolas; font-size: medium;">antenna installers round that told me the signal was marginal and the best</div>
<div style="font-family: Consolas; font-size: medium;">I could do was install quad shielded cable and a new antenna and that might set</div>
<div style="font-family: Consolas; font-size: medium;">me back ~$600 with no guarantees of actual improvement. So I did quite a</div>
<div style="font-family: Consolas; font-size: medium;">bit of research over a year ago and installed the quad shielding and a new</div>
<div style="font-family: Consolas; font-size: medium;">recommended antenna myself. Since then we've had all stations and it's</div>
<div style="font-family: Consolas; font-size: medium;">pretty rare to see any artifacts in the transmissions.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I have included the stderr output of dvbscan with the au-Newcastle file</div>
<div style="font-family: Consolas; font-size: medium;">for background here:</div>
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<div style="font-family: Consolas; font-size: medium;"><a href="https://www.dropbox.com/s/t5bk4z4f7cwer6c/scan.stderr">https://www.dropbox.com/s/t5bk4z4f7cwer6c/scan.stderr</a></div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>This is the channels.conf it generated:</div>
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<div style="font-family: Consolas; font-size: medium;"><a href="https://www.dropbox.com/s/solzd1ghk4fa8dg/channels.conf">https://www.dropbox.com/s/solzd1ghk4fa8dg/channels.conf</a></div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>And I also found this nice perl wrapper around femon, found at</div>
<div style="font-family: Consolas; font-size: medium;"><a href="http://www.linuxtv.org/wiki/index.php/Testing_reception_quality">http://www.linuxtv.org/wiki/index.php/Testing_reception_quality</a>, that</div>
<div style="font-family: Consolas; font-size: medium;">gives more human readable output than femon:</div>
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<div style="font-family: Consolas; font-size: medium;"><a href="https://www.dropbox.com/s/fgatpumulzxvm1x/femon-daemon-output.txt">https://www.dropbox.com/s/fgatpumulzxvm1x/femon-daemon-output.txt</a></div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>I©öd still be surprised if mythtv was substituting SBS 1 for SBS HD based</div>
<div style="font-family: Consolas; font-size: medium;">on a poor signal. I'd have thought that it would simply look up the</div>
<div style="font-family: Consolas; font-size: medium;">channel frequency for SBS HD, try to tune to it and fail rather than</div>
<div style="font-family: Consolas; font-size: medium;">somehow know it could tune to SBS 1 for the same content but at Standard</div>
<div style="font-family: Consolas; font-size: medium;">Definition. Maybe there's some new smart HD to SD fallback, who knows ?</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>Colour me puzzled.</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>Cheers,</div>
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<div style="font-family: Consolas; font-size: medium;"><span class="Apple-tab-span" style="white-space: pre;"></span>Doug</div>
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