Jittering and even minor sideways video distortion in a “downstream” device in this case, your 5005 can result when the video source, in this case, the DirectTv box is supplying a larger-than-needed signal to the 5005’s video input. The industry standard signal is 1vpp in amplitude. Most devices nowadays use automatic gain control components residing in the motherboard’s chipset to control this. If the associated circuitry in either the DTV box or your 5005 is defective or uncalibrated, this condition could occurr. Sometimes the AVC (automatic video gain) circuits are designed to ‘sense’ incoming signal strength via the ‘RF’ strength level coming from the source box (DTV). If not yet tried, you might want to try connecting the DTV box’s Ch3 signal-out, via co-ax, to the 5005’s RF (TV IN) connector. Cycle the 5005’s ‘source’ between "TV (Ch 3) and AV-1 (the rca jacks nearest the S-Video input) to check whether or not the problem differs between the RF-In and Vidoe-In selections.
Unless you or your DTV technician has the equipment to verify your DTV box’s video output level is within spec, you still wouldn’t positively know whether or not the problem is being generated by the DTV box or lies with improper AVC operation in the 5005. If you can return the 5005 for a replacement in a reasonable time, that would be the quickest way to eliminate it as positevely being the cause of the ‘jitter’ problem.