Originally Posted by b.e.wilson
Six or more loops in the power cord works better at keeping RF off a wire than those ferrite chokes do. If you have enough slack in the power cord, loop it and use zip ties or something to keep the loops intact. This is an old trick hams use when they want to keep RF off the outer conductor of a coax.
OK, I got a couple larger rectangular RF chokes at RS (273-104) and looped the ac cord through 2 of them (near the unit). I also put another choke around the coax (273-0105). The tests are on for tonight - let the games begin . . .
ps I have no optimism about this at all.
4:30pm (PST) Test begins. Reset counter set to 0, unit playing Live TV (local ABC, signal meter 100, running 1080i through component video, stereo through analog cords), ac cord goes directly into the wall (outlet tested to have good ground and correct polarity) through a very thick 3-piece extension cord.
6:00 No reboots yet. Continuing program as noted above (Live TV, etc.).
8:26 Watched an entire recorded episode of CSI: Miami without mishap. Many skip-ahead keystrokes. Might not sound like much, but usually a one hour program is good for at least 3 reboots and/or a sound drop-out followed by a lock-up.
8:50 Watching the Laker game on Live TV. Used the Guide to set Letterman and Leno to record tonight, along with Carson Daly.
10:05 Lakers won - still no reboots, etc. That's it for tonight's test. I'll check on the overnight recordings tomorrow morning. More complex usage to come. So far, I'm liking ferrite . . .
Testing, Day 2
8:45am All recordings from last night were complete and look ok on a quick spot check (I've got Leno running all the way through right now). TVGOS was fully repopulated last night, another channel was added and the cycle counter remained at 0, so no reboots.
10:40-11:24 There was a reboot while playing back last night's Letterman at about 30 minutes into the program. First reboot in almost 10 hours of power-on operation. This was followed by 2 more reboots. Switched back to Live TV and the reboots have stopped. It is interesting that Leno played back in its entirety, but Letterman seems to have a problem half-way through.
3:18pm Recorded another program while Live TV was set to another channel, then played back the recording, then left it on Live TV. No additional reboots. Maybe something was in the Letterman recording that caused a problem on playback. To summarize, the only reboots in the last (almost) 24 hours have occurred during the playback of one recording. This is FAR better than what I was getting before adding the ferrite cores. More to come.
9:38 Off for the night. Live since last notation, and no reboots. Note that the unit was left power on all day. Either the ferrite cores had a very positive effect on operation, or something else happened in the same time frame. It is always possible that something changed in the TVGOS transmission in the Southern California area (2/17 of course being a magic date) and TVGOS is the root of all evil in this story, but never the less, I can recommend trying some RF abatement just for fun - it's pretty cheap and can't hurt.
Testing, Day 3
8:30am - 10:39 No reboots overnight. I set one program to record, and left Live TV on another channel. All was going well until I went to the Guide to check something out. When I went back to Live TV the sound was off and, of course, when I hit the channel change up button the unit froze. This is the first mishap since the reboots during the replay of Letterman.
I'm closing this off at this point. My conclusion is still that the ferrite chokes may have substantially improved the stability of the unit, but there is some coding problems that cause audio dropout that leads to freezes, as well as some recording anamolies. It certainly looks less like a remaining hardware issue. BTW I have an email in to the local CBS station to find out if they did something between Feb. 17 and Feb. 18 that would affect the TVGOS data stream over their ATSC signal.