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PAL TV - Is is possible? — Parallax Forums

PAL TV - Is is possible?

EricGarlicEricGarlic Posts: 41
edited 2009-02-14 19:56 in Propeller 1
Hello -

I have a Prop Demo board with all the trimmings including the aerial jack.

I'm sure I saw a post on PAL TV and something along the lines of "tough", "UK" not covered - but I can not find the post.

(1) Is it possible to use the TV driver in the UK (PAL)? (sorry if I'm repeating a post)

(2) Are US aerial jacks different to UK aerial jacks, because the one I have doesn't connect with the aerials I have in my house? If different, I guess I will have to find a replacement (is this easy?)

Cheers
Eric

Comments

  • ColeyColey Posts: 1,110
    edited 2009-02-14 13:16
    Eric,

    (1) - Yes even though most PAL tv's can display NTSC
    (2) - I don't know if they are different but the jack on the demo board is the RCA type. Normally the Prop outputs composite video and should therefore be connected to an AV input on your TV.
    It is possible to generate UHF signals on the Prop which you can 'tune' your TV into using the normal aerial connection.

    Regards,

    Coley

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  • LeonLeon Posts: 7,620
    edited 2009-02-14 13:30
    UK TVs use Belling-Lee antenna connectors. It would be quite easy to make up an adapter with a short length of coax with a Belling-Lee connector on one end and a phono plug on the other.

    Leon

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  • virtuPICvirtuPIC Posts: 193
    edited 2009-02-14 13:34
    I have not plugged my demo board into a TV here in Germany (yes, we have PAL here)... I am confident that it produces a PAL composite signal. 'Composite' meaning BW-image plus synch. I am still wondering if it also can produce a PAL color composite. I don't expect since I darkly remember that the color subcarrier of 4.333618 MHz was selected that there are no harmonic interferences to synch.

    Any experience? How much can we do? In PAL or NTSC?

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  • ColeyColey Posts: 1,110
    edited 2009-02-14 13:45
    virtuPIC

    Composite video is often designated by the CVBS acronym, meaning any of "Colour, Video, Blank and Sync", "Composite Video Baseband Signal", "Composite Video Burst Signal", or "Composite Video with Burst and Sync".

    So yes you can display colour in PAL too.

    smile.gif

    Coley

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  • BillDerBillDer Posts: 33
    edited 2009-02-14 16:09
    @Coley,
    You mention that it is possible to transmit a UHF signal using the prop. How???
    That would solve some of my wiring problems is I could transmit the signal a short distance. Maybe a meter or two at the most.
  • EricGarlicEricGarlic Posts: 41
    edited 2009-02-14 18:31
    All- thank you for your input.

    I have an old colour portable tv; I doubt it take NTSC.

    It would be good to know whether anyone has managed to get a PAL tv to work with the prop and then what it is they did to get it working. Anyone?

    Cheers
    Eric
  • BaggersBaggers Posts: 3,019
    edited 2009-02-14 18:48
    Eric, yes, most of the drivers work with PAL, ( all of mine are PAL/NTSC ) as they all used the Parallax tv.spin driver as a starting point.

    so graphics_demo.spin also works in PAL/NTSC the mode ( found in tvparams [noparse][[/noparse] 3 ] ) is set to 0 for NTSC and 1 for PAL, 2= interlaced NTSC, 3=interlaced PAL.

    hope this helps.

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    Post Edited (Baggers) : 2/14/2009 6:56:07 PM GMT
  • ColeyColey Posts: 1,110
    edited 2009-02-14 18:49
    Eric,

    this has been done to death already, a quick search of the forum brought this up....

    http://forums.parallax.com/showthread.php?p=700697

    Note that this is composite video, it uses the Parallax TV driver which can be set up to do baseband TV, look in the archive at the TV object it's all in there......

    smile.gif

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  • dMajodMajo Posts: 855
    edited 2009-02-14 19:05
    Has someone done S-Video (I mean separate chrominance and luminance) on PAL? Are somewhere some drivers or instructions on how to modify the existing
  • Cluso99Cluso99 Posts: 18,069
    edited 2009-02-14 19:19
    You should see if you have a composite input to your TV. Do you have a SCART connecter? In the long run you are better to see if you can use composite input to your TV.

    You maybe able to generate carrier (to receive into the aerial with/without direct wires - closeby may be enough) but I am pretty sure you will only be ble to do this on the lower VHF range as UHF is in all likelyhood (because I don't know for sure) too high for the prop. I suspect the prop carrier is limited to the maximum clock frequency of the prop which is usually 80MHz. This is the lower part of the VHF frequencies used in Australian VHF TV (we are different to some other parts of the world). If I recall correctly, UHF starts at 300MHz and above.

    Maybe someone else can comment further.

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  • EricGarlicEricGarlic Posts: 41
    edited 2009-02-14 19:56
    I'll get the right jack as my botch doesn't seem to work (or the tv is too old - perhaps 23 yrs, the wife's from college!)

    Thank you for your time.

    Eric
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