UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Television Standards Converters, Modulators etc

Notices

Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions.

Reply
 
Thread Tools
Old 26th Jun 2017, 9:37 am   #21
julie_m
Dekatron
 
Join Date: May 2008
Location: Derby, UK.
Posts: 6,085
Default Re: DVD on 405 tv without converter?

Don't forget, you will still need a suitably-rated isolation transformer to power the TV if you go down this route.
__________________
Julie {formerly known AJS_Derby}
julie_m is offline   Reply With Quote
Old 1st Jul 2017, 12:15 am   #22
rambo1152
Pentode
 
Join Date: May 2010
Location: Manchester, UK.
Posts: 184
Default Re: DVD on 405 tv without converter?

Quote:
Originally Posted by julie_m View Post
Don't forget, you will still need a suitably-rated isolation transformer to power the TV if you go down this route.
Yes, indeed.

I have since built this modulator.

http://www.earlytelevision.org/405_modulator.html

I'm also using the same ATI graphics card as Peter as the nVidia ones I initially used needed a computer with Windows XP.

I hope we get a few more trying this, the card cost 7 and the modulator parts came from my junk box, all but the two chips, at 10 for the pair.

So there you go, anyone with a computer with a PCI-e slot can have their own Ally Pally for about 20.
rambo1152 is online now   Reply With Quote
Old 1st Jul 2017, 1:06 am   #23
rambo1152
Pentode
 
Join Date: May 2010
Location: Manchester, UK.
Posts: 184
Default Re: DVD on 405 tv without converter?

Quote:
Originally Posted by Oliver35 View Post
I'd not restored a TV before, and bought a little Ferguson for 25 locally
Hi Oliver, the Cossor was my first restoration project too, but as I was a TV repair tech from 1971 to 1990 I wasn't without experience!
I never encountered a set with a round CRT, ion trap, or an energised loudspeaker during my day job, those attributes alone endeared the Cossor 916 to me.

An even better set of the same vintage would have been the HMV 1805
Why? Because it's the set that entertained me for the first six years of my existence, and it's got mains derived EHT!

The Aurora is a nice piece of kit but it's not the only way

With a PC you have unlimited access to digital video files, and something like Vidblaster adds a mixer telecines flying spot scanners, telerecording monoscopes, caption generators, etc. etc. All virtual of course, but no less convincing on the screen of your old set.
rambo1152 is online now   Reply With Quote
Old 18th Jul 2017, 7:34 pm   #24
Focus Diode
Octode
 
Focus Diode's Avatar
 
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,180
Default Re: DVD on 405 tv without converter?

Well, my experiment in transferring a 405-line VHS recording to DVD wasn't met with success, although the sound is perfect throughout. No real surprise there.

This is the image I'm getting from the Regentone 194 (Plessey) set fed by a VHF L'l Dino modulator with the output direct from the DVD player. It looks like it might lock but adjusting the line hold control increases the chaos.
Attached Thumbnails
Click image for larger version

Name:	Edited_ImageEasyImageEditor_20170718_419.jpg
Views:	86
Size:	84.1 KB
ID:	146405  

Last edited by Focus Diode; 18th Jul 2017 at 7:39 pm.
Focus Diode is offline   Reply With Quote
Old 19th Jul 2017, 1:59 pm   #25
julie_m
Dekatron
 
Join Date: May 2008
Location: Derby, UK.
Posts: 6,085
Default Re: DVD on 405 tv without converter?

VHS sort-of-works for 405 line signals because the recording is continuous in time, and blanking and sync pulses are represented directly as part of the recording. Whereas, an MPEG stream recorded on a DVD is framed to suit a broadcast standard. Only the active parts of each line are digitised, with the blanking and sync regenerated digitally during playback.

Your DVD recorder will be recording nearly 2/3 of the first 405-line line of the first field into the first 625-line line, ignoring any video signal during the 625-line horizontal flyback period; then recording the rest of the first 405-line line, the first 405-line horizontal flyback period and the beginning of the second 405-line line into the second 625-line line; again ignoring any video signal during the 625-line horizontal flyback period; then recording the end of the second 405-line line into the third 625-line line.

When played back, it will generate 625-line-style sync pulses after each line and field.
__________________
Julie {formerly known AJS_Derby}
julie_m is offline   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 5:43 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright ©2002 - 2017, Paul Stenning.