Baird 240 line Operation

[peter scott]

The line time base has much greater adjustment range than the frame time base.
Peter

[Geordie McBoyne]

Marconi 702 operating with the frame oscillator adjusted for 25Hz. Although this receiver is possibly a later production model it has the Baird valve and components.    Actually, the “Baird” valve might still have a useful function when receiving 405 line test signals with simple sync pulse trains which only have a single broad frame sync pulse.

Geordie McBoyne.

[Murphyv310]

Hi.
Not got any further with doing standards conversion on this PC.
I'm not familiar enough with Linux, I am better than a few years back but just not confident enough.
I think I need to load in Windows 7 to proceed. XP for some reason I can't fathom out won't accept the drivers, I'm wondering if it's because it's a Dell PC and I'm not using their restore discs.

[peter scott]

Hi Trevor,
Mine is Dell too and the driver from the website I sent you worked fine for me.

Peter

[Murphyv310]

Morning Peter.
It's not the driver for the card I'm having the issue with its XP and the Dell drivers for LAN, sound and other. It did come with Win 7 and my genuine XP disc is the home version SP2. I'm sure I'd get it to work ok with 7.
I'll not give up don't worry.

[Murphyv310]

Hi.
Not made any progress with this due to other projects but I'd like to find out if the Raspberry Pi Composite video output would be able to be fooled into giving other standards or not?

[Murphyv310]

  TV22mod1.pdf (Size: 808.32 KB / Downloads: 8)
Hi.
I'm now going to gradually upload the circuits which have been modified in this TV22.
Firstly is the Video amp, part of what i did yesterday.
Before I did the mod I decided to try and check the frequency response of the existing EF91 amp. I used a function generator and used frequencies from 250Khz up to 3.5Mhz. The response was fairly flat to 2.5Mhz. After fitting the 30FL1 I did the same test with the original values as per the Bush. The results were good up to around 2Mhz then the level increased above it to 4.5Mhz, so the cathode caps were changed to flatten off the response. Results are brilliant with a higher video level. An excellent and probably a good thing to do on any TV22. The cathode follower of course is low impedance and this reduces stray capacitance.

[peter scott]

Thanks to DaveC live television streams are playable in VLC player and thus very conveniently playable in 405 line television sets or any other obsolete types.
http://www.nostalgiatech.co.uk/Baird%20240%20lines.htm

Peter

http://a.files.bbci.co.uk/media/live...ne_london.m3u8

http://a.files.bbci.co.uk/media/live...bc_two_hd.m3u8

http://a.files.bbci.co.uk/media/live...c_four_hd.m3u8

Copied from: http://steveseear.org/high-quality-bbc-radio-streams/

[ppppenguin]

Peter, these links are dead:

http://a.files.bbci.co.uk/media/live...ne_london.m3u8

http://a.files.bbci.co.uk/media/live...bc_two_hd.m3u8

http://a.files.bbci.co.uk/media/live...c_four_hd.m3u8

[peter scott]

Sorry Jeffrey, copying and pasting links appears not to work when they are shortened.
Try these:

http://a.files.bbci.co.uk/media/live/man...ondon.m3u8

http://a.files.bbci.co.uk/media/live/man...wo_hd.m3u8

http://a.files.bbci.co.uk/media/live/man...ur_hd.m3u8