Composite MPX trough Passive DI BOX ?

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  • November 21, 2012 at 9:10 pm #1404
    DavidMB
    Member

    Hello,

    i have a situation, where I need a 50m long cable between Link Transmiter and Computer with Brakeaway Broadcast Processing to send full MPX signal.

    I know that this would be best done if the units would be symmetricaly connected but my soundcard output does not have that option – only assymetrical output – the input on the link transmitter has symmetrical input tough.

    So I think I need a DI BOx on the computer side that is frequency and phase wise linnear from 10Hz to 100KHz. ?

    What do you guys think – is this kind of connection possible? Is there any other solution – active DI BOX ?

    Thank you and best regards,
    David

    November 21, 2012 at 10:50 pm #13517
    DavidMB
    Member

    Update:

    I did a little searching on the topic and found out that the best way would be to use Coaxial cable – such as RG58 /59.
    (I attached screenshoot of the orbans datasheet where i found some info on that topic…)
    The problem begins when the capacity of the line begins to rise above 0,047uF. So with RG58/59 the fun ends at aprox 30 meters…. after that stereo separation starts to deteriorate noticably…
    RG58 has 100pF/1m

    How about RG114 (27pF/m) or RG 63 (33pF/m) cable ?

    Any advice would be apriceated. 😀

    Best regards,
    David

    November 22, 2012 at 7:25 am #13518
    Milky
    Keymaster

    Thinking outside the box, would a 2.4 or 5.8 wireless link have the bandwidth?

    November 22, 2012 at 8:38 am #13519
    Boki
    Member

    [quote author=”Milky”]Thinking outside the box, would a 2.4 or 5.8 wireless link have the bandwidth?[/quote]Yeah .. but then he would need something to stream and receive + latency + more possibility to somethings stops.

    Anyway, do not try RG58 but try RG213.
    Once it helped with 60-65m. You might still have mpx overshots, even with that cable.

    November 22, 2012 at 11:56 am #13520
    DavidMB
    Member

    Wireless is unfortionaly not an option.

    Boki – i checked – RG213 also has 100pF/m so I guess this would cause the same effect as RG58 or 59 regardig stereo separation…

    RG114 looks very good regarding capacity- but there is a catch – it has 185 OHM impendance – can this cause a problem with composite MPX audio signals?

    Thanx for all the input and best regards,
    David

    November 22, 2012 at 5:07 pm #13521
    Boki
    Member

    it would be best if you can borrow few types of cable and try yourself. I never used more then 50ohm cables so i don’t know.

    Check cfd/lmr-200/300
    http://www.timesmicrowave.com/products/ … /12-15.pdf
    http://www.timesmicrowave.com/products/ … /20-21.pdf

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