“Why can’t I get this TV off of channel 3?” -or- How I spent my weekend

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For those of you with Comcast Analog service, you probably are aware that Comcast will be dropping most of its analog signals and will move to an all-digital delivery in a few months.  Comcast has begun rolling out digital set-top boxes (aka Digital Control Transceiver, Digital Cable Box, etc.) to analog customers and I received mine last week.

Digital cable will offer some new amenities but, as you can tell from reading various on-line bulletin board forums, it will also remove at least two very important services for some existing Comcast analog customers: high-definition local broadcasts; and the ability to do time-shift programming with a VCR/DVR easily and without added monthly fees.

Not all analog customers will be adversely affected, but I think that there are enough out there who, like me, appreciate having cable but not enough to pay extra for local HD and certainly not for a DVR monthly service.  In that light, I offer to anyone interested my report for the previous week-end in setting up my new (old) Motorola 2000DCT digital cable box and trying to solve the second item above (time-shift recording).  And the fun times that ensued.  I will report back later on the high-definition problem.  Maybe.

Even MORE remotes! Go Digital !

First I’m going to present some very high-level depictions of what is going on with the signal swap-over.  These diagrams are not to scale and are meant as a means to grok the basic idea.  They represent about 2% of what’s going on, but hopefully kind of gives you the idea.
For starters, here is a key that shows the two basic signal types:  analog and digital.  Analog signals take up more room than digital, that is one of the reasons for the swap: you can actually cram more stuff into a digital signal.  In this figure, we are assuming there are three basic channels: FOX, CNN, and TLC.  For the remaining diagrams we are assuming that we want to tune in the TLC channel.

Analog vs Digital Channel "key"; three channels are represented here, three in analog and the same three in digital

The two diagrams below show what most of us  analogger’s have currently: the basic analog signal coming out of the wall and run into either a TV or VCR/DVR.  We ignore the digital signal in these illustrations.

Typical analog cable subscriber
Typical analog cable subscriber with a VCR in the loop

So for the most part the above is how analoggers control their signals.  With the upcoming switch to “all digital” on the Comcast network, however, a new cable box enters the mix with conceptually a digital to analog (D/A) converter.  Again, a high-level concept:

TV and cable box, only digital signals pass through and are converted to analog. The TV must be tuned to channel 3.
Cable box with VCR in loop. Cable box can be tuned to channel 12, TV AND VCR must be on channel 3.

So this last picture should highlight the trouble with the VCR issue: the VCR has to be set at channel 3 and only the cable box controls which channel is passed through.  The VCR no longer can be used to change channels (remember, it has to stay on channel 3) and you can no longer use the VCR to do automatic timed recordings to different channels, i.e. tape, for example, “The Simpsons” on FOX at 07:00 PM and then tape “Larry King” on CNN at 08:00.

Comcast-supplied cable box (bottom) set to channel 12

The channel changing has to be performed by the cable box which does not (or may not– depending on your box) have a means to do a timed automatic channel change.  So my VCR is practically useless except for manual recording of stuff.  And, as I mentioned, I don’t want to be burdened with more monthly fees from services such as TiVo.  Also, I don’t have super high-speed internet so watching and recording over the internet is not an option.
So what are the alternatives?

  1. Tune the cable box to the channel that you want taped ahead of time and set the VCR to tape channel 3 as a regular timed recording.  Too limiting.  Too hard to remember to set the cable box ahead of time.
  2. Get a Comcast-provided DVR machine and pay a monthly fee for time-shift recording.  ($16 a month).  Too expensive.
  3. Get a Comcast-provided cable box that has time-shifted channel changing feature.  This allows you to program the cable box to change channels at the correct time.  You then have to also set up your VCR to time-shift record channel 3 at the right times.  This sounded promising.  But the cable box that Comcast provided to me did not have this feature.
  4. Get a Comcast-provided cable box that has an IR blaster feature.  This allows you to program the cable box to do time-shift channel changes AND the cable box blasts the IR commands to the VCR that are needed to stop and start recording.  Very promising.  In fact it turns out that the cable box that Comcast sent to me does have an IR blaster port.  But the feature has been disabled by the Comcast firmware.  Strike four.
  5. Request Comcast to swap out your cable box for one with the IR blaster feature that IS enabled.  And works.  How have your calls to your local Comcast office gone in the past?  My opinion here after on-line chatting with several tech reps is that few understand the problem and I didn’t want to have to take off work, go swap out a box, re-connect everything, find out it doesn’t do what I wanted and can’t be enabled, yada yada yada . . .
  6. Cobble up an old PC into a media center, install a TV tuner card, add an IR blaster, set up an internet connection to control it, . . . ok forget that one too
  7. Get a VCR that has an IR blaster feature.  This allows you to program the VCR to do time-shift recording and the VCR blasts the IR commands to the cable box to change the channels at the time of recording.    Promising.  But where can I find a VCR with that feature?  It’s not easy to find one on-line.   It is equally impossible too, once you find one on-line, to tell if it will be compatible with your cable box.

I finally went with option number 7: purchase a new VCR with an IR blaster.  I actually found one at Best Buy, the Samsung DVD-VR375 for $175.  If you opt for this type of approach, it is probably best to check out the in-stock devices for several reasons:  First just to confirm for yourself that the machine in question does in fact have an IR blaster (also called a Set Top Box Control port); and to allow yourself to return the device if it does not control your cable box properly.  Another tip for this option:  As it turns out, the Samsung model I purchased does not have an internal tuner, but given that tuning is now done a la the cable box I didn’t consider that an issue for myself.  You might have different opinions on that, however.

Another part of the weekend fun: The On-Demand channel; never did find out what was causing this

I was just glad to find a recorder IN TOWN and IN STOCK although, oddly, they were all open-box returns!  I think people had returned them because they may not have realized that the machines did not have an internal tuner.  One goofy point about this solution:  you have to leave the cable box left on so that the VCR can change the channels.  In the morning, you’ll have forgotten all about it and as you fumble to the living room you will press the Comcast remote control’s “ALL ON” button and voila — the TV turns on and the cable box turns off.  From thus experience came the title of this report.  Arggggh.

Rear of VCR (top) and its IR blaster port; on the bottom is the cable box with its disabled IR blaster port
Close up of IR blaster set in front of the IR sensor on the cable box. The VCR can change the channel on the cable box this way.
All On sends a signal to each of the products (cable box, VCR, and TV) but, if the cable box were left on overnight in order to facilitate a timed recording, the switch turns OFF the cable box and turns ON the TV. Explain that to your 77 year old mom. "I can't get this #@$& TV off of channel 3!"

So I have a solution for recording multiple channels at different times.  It’s not perfect, but isn’t that was progress is for?  Er . . .   wait a minute .  . .


I gave in on the HD problem and just subscribed to HD. Now I have another box and yet another annoying message.

11 thoughts on ““Why can’t I get this TV off of channel 3?” -or- How I spent my weekend”

  1. Gadgeteer Comment Policy - Please read before commenting
  2. I feel you pain, however, there comes a tiem when we have to cast off our outdated analog technology and move boldly, to the digital age.

  3. I never did get Comcast’s digital converter to work after several tries with their tech gurus. In any case, since my TV has a built in NTSC tuner (digital), I was able to receive the digital channels after Comcast did the switch over to all digital. The DVR problem was solved by upgrading my Tivo to their newer model that does all of the time shifting/channel changing that is necessary.

    Good luck with your conversion.

  4. One of the things which has kept me from ever embracing any premium channels over the years is my antipathy towards cable boxes. Why have a tuner built into your TV and DVR and VCR etc, if the tuners don’t have any ability to function with the signal coming in? The much-maligned and nearly moribund CableCard sure didn’t fix that for the digital age, so I can only imagine that the industry simply doesn’t care to make things easier for customers. After all, we’ll just pay the $16/month for the POS cable box/DVR combo from the company anyway. Baaah.

  5. Comcast is the “ObamaCare” of the cable industry. I’ve had it for several years and currently have phone, Internet and cable (Hi-Def Digital) through them. All I can say is, I don’t have a choice. No other cable companies are available in my area for competition. I’ve never been so frustrated as I have with Comcast’s frequent outages and weird things happening that the customer service rep cannot explain. Last year, I went through 6 Hi-Def boxes before they finally decided the older Motorolas needed to be replaced by a newer model. (Duh!) (Sigh)

  6. Comcast is the worst. I have DirecTV with their (ancient) Tivo DVR. I am eagerly awaiting their HD Tivo. You could also look into Dish Network. They will be making upgrades soon.

  7. I, too, am in Columbus, and I have one recommendation: AT&T U-verse. I made the change from Comcast a month or so ago, and so far, I am more than pleased with the service. They don’t charge extra for DVR, and the internet is considerably faster (17.9 mbps down compared to 9 mbps with Comcast). I’m also saving quite a bit of money, and getting more in my TV package. I would check this out.

  8. I have Verizon FiOS TV, Phone, and Internet, for half the price I was paying for Comcrap. Its worth the upgrade to the FiOS line if available in your area. I get an insane amount of HD Stations, and my standard package has the upgrade option to the speed of 50/30 mbps too. I use the DVR from them with no problems at all, and can view the recordings in any room, and or pause the station in one room, turn off the TV, and go to another room and pick up from the pause point. I do miss having the basic cable analog line because I just don’t have the option of using a Sling Box anymore with the Verizon FiOS Line.

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