JVC crt tv. fault is no picking UHF stations where as VHF stations are crystal clear. What could be the fault?

What is the difference between a RF channel and a virtual channel? The RF channel is the channel that the TV station uses to broadcast its signal. Before the conversion to digital, TV stations were normally identified by their channel number, and most people knew that a particular network was on a specific TV channel. While analog broadcasting was being phased out and all TV stations were converting to digital broadcasting, it was necessary for the TV stations to continue to broadcast their analog signals on their original RF channels, and also broadcast their digital signals on a different RF channel. However, since the TV station used their broadcast channel as part of their identification, they wanted to keep using the same channel number. To allow this to happen, the new digital television broadcasting standards (ATSC) provided TV stations the ability to continue to use their original channel number and also tell the TV set to tune to the new RF broadcast channel when their virtual channel number was selected. The original channel number is called the virtual channel number, and it will be followed by a period and a second number (3.1, 7.1, etc.).
One of the benefits of converting to digital for the TV stations is that they now have the ability to transmit more than one program at the same time on the same RF channel. The number of additional channels they can broadcast is determined by the resolution of the program (SD vs. HD, text only, music only, etc.). The second number in their virtual channel number indicates that one of the additional programming sources from the same TV station is being viewed (10.2, 10.3, 10.4, etc.).
When selecting an antenna, it is important to understand the difference between the RF broadcast channel and the virtual channel. Antennas are designed to receive specific ranges of RF channels, and the antenna needs to be selected for the RF channel you wish to receive. TV stations broadcast in two broad frequency ranges, called VHF and UHF. RF channels 2 through 13 are considered VHF, and RF channels 14 through 51 are considered UHF. In order to pick up the channels, the antenna has to be designed for the correct frequency range. It is very common today to find that TV stations using virtual channels 2 through 13 are actually using RF broadcast channels in the UHF range. Although not as common, some TV stations using virtual channels 14 through 51 are actually transmitting in the VHF range. An antenna designed for only UHF channels will not work effectively for RF broadcast channels in the VHF range, and an antenna designed for only VHF channels will not work effectively for RF broadcast channels in the UHF range.

try installing a tv signal amplifier on the line from the antenna just before the tv. Tv stations put out differing amts of power, one could be stronger than the other.

I have a similar issue. When the digital switch happened here some of the local TV stations changed frequencies from UHF to VHF. I do not have a VHF antenna so I am unable to receive these channels. I do have a great UHF antenna, but it will not receive VHF. The fix is of course is a new UHF/VHF antenna. I am 50 miles away from the TV transmitters.

This may or may not be your problem. I hope this is helpful to you.

Bob

There's a setting in the TV to be able to switch between VHF and UHF. VHF is limited to channels 18 and below (if I remember correctly). Look for a switch or setting on the TV to change it to UHF. Could be a setting in TV menu or a physical switch on the TV.

You will need to put your aerial into the rear uhf socket of the VCR then take another connecting lead (flylead) from the out of the VCR & put this into the aerial socket of the TV. You will now need to select a channel on the TV (best to use channel zero) & tune the TV to the VCR signal. The best way to do this is to put in a recorded tape eg a film /press play/ then tune the TV until you pick up the playback of the film, then store this on the TV. This will give you your VCR channel. You will now need to tune the VCR to your broadcasted stations so that you can record.

hello there i have a link for the manual below please rate me if you find this info usefull thanx
http://service.us.panasonic.com/OPERMANPDF/PVV4022.PDF

Hi there!

Assuming that you tried to tune stations onto the UHF bandwidth and received nothing,Commonly the tuner box is probably at fault and needs replacement. The VHF and UHF signals are split inside the tuner so if you receive VHF fine then UHF should as well unless faulty of course. Some circuits require an external IC to do the switching, but more on the older models. Regards and good luck, JUS004

Replace tuner, get number and order from MCM, or Bluestar-online, Tritronics.

a no ufh channels would be a setting in the menu, but when your vhf channels go, the problem is typically the tuner itself, or the band switching ic. could be either. you will need a schematic to know what voltage is supposed to be on the pins.