On Thu, October 19, 2006 2:35 pm, Eric Paynter said: > Right now, on channel 19 (151.25MHz) tuner 1 has loads of static - picture > is barely discernable, but on the same channel, tuner 2 is near perfect. > Nearby channels (17, 18, 20, 21), are all near perfect on both tuners. On > the channels in the 40's (above 300MHz), tuner 1 has mild crosshatching > and tuner 2 has strong crosshatching, so in that range, I'd say tuner 1 is > better. > > I'm going to play with various combinations of the "+4" in the different > frequency ranges to see what effect that has.
OK, I did some poking around and have some questions: - Is there any way to detect the current signal strength and determine automatically if the Low Noise Amplifier needs to be enabled for a particular channel? - Is there any way to detect the current signal strength and vary the strength of the Low Noise Amplifier to achieve the optimum signal? I bought an external amplifier and did some tests, which yielded some interesting results. I chose three channels that tend to give me trouble and I tested with no amp, with the internal amp, with the external amp, and with both amps. Results were: Channel 19: the external amp alone gave the best picture. Channel 45: the internal amp alone gave the best picture. Channel 9: using no amp gave the best picture on Tuner 2, but on Tuner 1, it was best with the internal amp. Both amps combined always yielded a very bad picture, which makes me think that too much amplification is overdriving the tuner. If it was possible to know when amplicification was needed per channel, perhaps the internal would be sufficient. If the internal could be varied, then even better. -Eric _______________________________________________ ivtv-devel mailing list ivtv-devel@ivtvdriver.org http://ivtvdriver.org/mailman/listinfo/ivtv-devel
