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Originally Posted by damen
I had success with my Zenith 29jc20 set I got some help from my friend Danny and we made it work. It makes a better picture and seems to have eliminated interference I used to get which is bad at my present location and the tuner can be on any channel since it has been bypassed. No more need for a converter box to and if they ever bring back the VHF tuner I can put it back the way it was. Some how I doubt that will happen. The bar on the screen of the TV is from my camera in the picture I added. I may try this on a RCA next.
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I doubt the VHF channels will ever come back. Most of the UHF TV channels (channels 14 to 52) have been auctioned off to other services, so they will never again be used for television broadcasting in this country. The remaining 38 channels may well be auctioned in the future.
The VHF channels are no longer used for telecasting, and may well be auctioned to other services before long as well. The few FM low-power stations that operate on channel 6, for example (there is one such station in Cleveland and one in Chicago; there may be others as well) will have to cease their operations some time this year, as I think the FCC is planning to reassign the entire VHF television spectrum by the end of the year. The goal seems to be to clear the entire VHF and UHF TV spectrum of all television stations, so that the frequencies can be used for other things such as land mobile, cellular telephones and the like.
I don't know how you were able to modify your Zenith chassis 29JC20 to receive digital TV signals, unless you are using a digital-to-analog converter box feeding the set's original VHF tuner, set to channel 3 or 4.
I do not know how you managed to bypass the VHF tuner if you are using a converter, as these boxes output to either of the two VHF channels I just mentioned--the VHF tuner would have to be operational and set to one of those channels before the converter would work. I seriously doubt that these converter boxes have provisions for direct input to the IF strip, or to the UHF tuner input of the VHF tuner. The latter is the only way I can think of that the box would operate without the VHF tuner; however, even then the VHF tuner would have to remain on the "UHF" position to receive the output of the converter.