By the way, i just found this:

Quote:

Ivtv developers have noted that the Samsung tuners used in later PVR 500s are rather sensitive and will show a grainy picture if supplied with too high a signal level. In this case you must reduce signal strength by either inserting a 'pad' (a resistor) between the PVR and the cable, or if your house has a cable amplifier, by reducing the gain on the amplifier.


in the mythtv wiki: http://mythtv.org/wiki/index.php/Hauppauge_PVR-500
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Empeg Mk1 #00177, 2.00 final, hijack 4.76