We have a PDP-5070 receiving OTA signal via antenna in the attic. Reception has been great, and we get all local channels in HD. One channel has started to "pixelate" frequently, as though we're not getting a good signal. It scrambles the picture for several seconds several times a minute.
Checking signal strenth shows arounf 69-71, which is actually better than several other channels, which are displaying perfectly. We're tried reorienting the antenna with no luck. Also re-scanned the channels with good signal strength on the problem channel. We've had the same system configuration for years and no problems previously.
Any troubleshooting steps we can take? Since it's only one channel, is it possible there's a problem with the tuner? For reference, this is on channel 5.1 (CBS) in the Kansas City area. Other channels (4.1, 9.1, etc) are fine.