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OT: slightly. PAL TV conversion. |
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| message from Lurch on 12 May 2004 |
Hi all,
I've just acquired an in car TFT Screen with tuner. The instructions
say it's NTSC and the manufacturers blurb on the advert says it's PAL
B/G/NTSC.
Now I've got it fitted the picture is spot on, but I've got no sound.
Now I think about it, we're PAL/I aren't we, I missed that point at
the time!
Does anyone have any ideas on how to modify the tuner to receive
PAL/I, or just alter the band pass for sound, or add another one, or
feel free to add more ideas.
Many thanks all.
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| geoff replied to Lurch on 13 May 2004 |
European PAL and British Pal have the sound carrier at different
frequencies (5.5 and 6.0 megs from the main carrier ?)
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| Nick Brooks replied to Lurch on 12 May 2004 |
The audio sub-carrier frequencies for PAL/I and PAL/B are different so I
don't think you'll be able to bypass the sound as it won't be properly
demodulated.
So that leaves modifying the tuner which is beyond me or adding a
seperate tuner for sound
you can buy car tv tuners from www.caraudiosecurity.com
Nick Brooks
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| Roger Wareham replied to Lurch on 12 May 2004 |
The sound offset is different - 5.5 MHz for system B/G, 6.0 MHz for
system I.
If you're lucky, there will be a small component on the board that looks
like a three-legged ceramic capacitor with '5.5' marked on it. Whip that
out and replace it with a '6.0' type (from Maplins or similar) and the
sound should burst into life.
Roger.
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| Lurch replied to Roger Wareham on 12 May 2004 |
I realised that after I fitted it. I thought PAL was PAL!
I'll whip it out and have a quick look at that, although I'm not a
lucky person by nature, but you never know!
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| a replied to Lurch on 12 May 2004 |
I found this problem a couple of years ago when I bought a graphics card
with built in tv tuner for my PC. Couldnt get any sound at all and then
discovered it had a PAL B/G tuner. It was hard work trying to convince the
returns department that was the problem - I eventually got one from
somewhere else with the correct PAL I tuner and it worked perfectly. I'm
sure I had another card at some point that had PAL B/G/I and SECAM all in
the one tuner?
You should be able to get the tech specs for the tuner from google - most of
the ones I have seen are made by Philips
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| BigWallop replied to Lurch on 12 May 2004 |
Are you sure you've picked up the audio channel from the tuner system and installed to
an amplifier before it goes to speaker system ?
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| Lurch replied to BigWallop on 12 May 2004 |
I thought that to start with, but it's got an inbuilt speaker.
Once I'd finished fitting it I tried an external speaker and that
didn't work either so after a bit of research I found out that PAL
isn't just PAL. Never mind, another project for the list!
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| BigWallop replied to Lurch on 12 May 2004 |
I have to admit to not knowing to much about this type of subject, but thought it
could have been something as simple as not have a good enough amplification on the
audio side of things.
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| Ian Stirling replied to Lurch on 12 May 2004 |
Look to see what they are going for on ebay, and how much one that
would work is?
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| Lurch replied to Ian Stirling on 12 May 2004 |
Tried that, that's why I ended up with this one. I wouldn't mind
spending a few hundred if it was for the car but it's only to go in
the van.
After a bit more of a looking at I think it might be easier to just
use an external tuner, which is a shame.
Unless, can you get a PAL to NTSC converter that transparently
converts all the frequencies and sends the modified channel to the
tuner in the unit, rather than just sending the tuned and converted
channel on one frequncy?
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| Lurch replied to Lurch on 12 May 2004 |
I've just found a tuner, the specs on it say, amongst other things
Response Speed (ms): R:30 / F:50
Reception Frequencies:
VHF CH1-5 48.25-91.75 MHZ
VHF CH6-12 168.25-222.75 MHZ
UHF 471.25-869.75 MHZ
Cable 112.25-166.75 or 224.25-446.5 MHZ
Color System: Auto/PAL/ N 4.58 / N4.43
Sound System: 5.5m/6.0m/6.5m
Does that sound about right? I thought it was but as we've already
seen, I'm not clued up on PAL standards and suchlike! I think for £35
one of these is probably cheaper than converting the existing unit.
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| Lurch replied to BigWallop on 13 May 2004 |
Looks about right, I think I'll go and order a tuner now then.
Thanks muchly.
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| Dave Plowman replied to Lurch on 12 May 2004 |
First thing would be to contact the maker to see if this is possible - the
days of just tweeking a couple of coils have long gone.
It sounds like this device was made for US troops in Germany.
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Archived message: OT: slightly. PAL TV conversion. (UK DIY House Renovation)
