I think you are painting yourself into a corner. So to Speak.
Why buy a SetTop Box to convert to an old VHS Tape when you can buy a Digital Recorder for probably the same price.
The modern way to Record video is to use a Hard Disk Drive Recorder rather than a VCR. They have a built in tuner and can record 2 stations at once and have a built in Electronic Program Guide. The EPG info is transmitted with the Digital TV transmission from the broadcaster.
I bought one 2 weeks ago for an old 85yo friend so he could record late night stuff and play back later. He still uses the VCR but only for old VHS Tape playback. It was a TEAC HDR9650TS Digital Video Recorder and I picked it up new for Aus$188.
Here are the unit features
- Main Features:
DVB-T Twin Digital Turners
DVR Recording: Record three channels while watching a 4th from same network Smart Series Record feature to record a whole series at a touch of a button
2.5" Sata Hard disk: 500GB
Time Shift Function (Pause live TV)
HDMI Digital Output
Digital Audio Output
Supports TV formats 4:3 and 16:9
Electronic Program Guide (EPG) up to 7 days in advance
EPG searching and auto download
Recorded program edit
Copy files from internal HDD to external HDD
USB 2.0 Interface
This was my original reply until I saw the light.
So, Hopefully one of these will answer your queerie.
A digital TV picks up the new Digital Transmission and stores it in memory, then supplies the high definition to the input of your TV.
With a STB, once the digital broadcast signal is captured by the Set Top Box tuner, it is stored in memory and then it is converted to Video Format and comes out of the back connectors as a standard video & audio signal on the Red & White (Audio) & Yellow (Video) as a composite signal that can also be attached to an older VCR tape recorder.
If the STB output connectors have a Red White & Yellow RCA plugs then it is all ready to be picked up by an older TV or VCR.
Most set top boxes also have HDMI Output for high definition video & sound in the one cable, which attaches directly to the back of your TV (assuming it doesn't already have a tuner (STB) already built in).
HDMI is the state of the art cabling for modern devices. But probably not on the old VCR.
It will either use Component, Composite or SVideo cables. Match one of these cable standards up with your VCR.
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