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Getting a picture on a mini camcorder CRT

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Quantumplate:
I know, not very original, but for a bit of fun it appeals. I have the 1/2" crt from a broken Sony ccd-trv11e and worked out the ribbon cable connections thanks to Mr 12 volt vids. The manual for the camcorder says it is ntsc based and being in the UK i have pal gear (dvd player) going into it. So i thought i better get a converter box (shown in pic). But..i can't get a picture - I get a whitey screen whatever position the switch is in on the box.

All the videos on this I've seen, they just seem to provide a composite video signal and away they go. I don't understand much about old tv signals, specifically how the channel frequency o/p of the dvd player (in my case) would be matched to the fixed channel i/p of the viewfinder crt (whatever that is?). Are they always the same?

wasedadoc:
The E at the end of Sony camcorder model names usually means it is a European model and is engineered for PAL.  If it is a PAL model, then despite the impression you are under, the viewfinder module is expecting 625/50 input and you should not be using a conversion to NTSC. Even so, either NTSC or PAL format video into the viewfinder module from a 210 or a 210E should give something visible on the tube.

The service manual can be downloaded from https://www.manualslib.com/download/1002030/Sony-Ccd-Trv11.html.  Use that to positively identify the video input point. Page 4-47 schematic.  Page 4-49 location D2 for physical placing of CN901.

Why are you using a cable with those Belling-Lee coax plugs?  The video signal from the DVD player into the viewfinder needs to be baseband not RF.  Your mention of "channel frequency o/p of the dvd player" and "fixed channel i/p of the viewfinder crt" is nonsense.

Edit: Fixed link to Service Manual.

Quantumplate:

--- Quote from: wasedadoc on May 23, 2023, 05:06:19 pm ---Even so, either NTSC or PAL format video into the viewfinder module from a 210 or a 210E should give something visible on the tube.

Why are you using a cable with those Belling-Lee coax plugs?  The video signal from the DVD player into the viewfinder needs to be baseband not RF.  Your mention of "channel frequency o/p of the dvd player" and "fixed channel i/p of the viewfinder crt" is nonsense.

--- End quote ---

Thanks for helping with my education on this. I've always skipped over analogue tv theory until now. And the only connectors i've ever used on the back of tvs/vcrs/dvds have been Scart connectors. 

What are the 210 and 210e you referred to? You lost me there.
I checked in the manual and it's pin 3 for video which i've wired up so that's all good. I did try inputting a signal without the converter box too when i initially hooked everything up two weeks ago.

I have that old coax cable there because i thought i would be plugging it into the rf out of an equally old vcr recorder. That didn't give a picture other than white so i moved on to the dvd player. Having soldered the pin to the wire I've left it like that and have to use adaptors to join it to a phono rca cable.
So i'm using the rca Video out socket from the dvd player.  Is that a baseband signal?
I thought it was rf out tuned to channel 36 for an analogue tv to decode, hence my utter confusion. Still confused actually as i don't see any other connection options from my dvd player. I've looked up baseband, but in all the analogue tv theory sections in my books the only signal in town is the rf composite video/audio signal, so i'm none the wiser yet.

 I do appreciate your efforts though!

wasedadoc:
Sorry about the 210/210E.  I did of course mean TRV11/11E.  Don't know why I typed 210.

Yes composite video goes in on pin 3, the middle one.  And you need the ground side too on pin 2.

Video waveforms you see like https://en.wikipedia.org/wiki/Composite_video#/media/File:NTSC_Signal.png are always baseband.  DC to about 5MHz.

Quantumplate:

--- Quote from: wasedadoc on May 23, 2023, 11:01:58 pm ---
--- End quote ---
Right, got it as far as what a tv baseband signal - one yet to be modulated on an rf carrier. So the yellow rca video out socket on the dvd player is CVBS or baseband. I should be getting a picture then, but i'm not. Maybe the viewfinder has a problem. Yikes, that 232 page service manual is the longest one i think I've ever seen!

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