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Thread: BMAC RF board

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    Default BMAC RF board

    Hi all

    I plan on using the FM video detector and part of the IF strip on an old BMAC satellite decoder RF board for a comms project. It would be really useful if I actually had a circuit for the thing!!

    Anyone out there who used to work with the old BMAC satellite stuff and still have circuits lying around. I need to know the IF freq and a circuit for the RF deck from the decoder.

    (Also posted in Decoders forum but not really a satellite related project)

    Cheers

    kuband



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    Quote Originally Posted by Kuband View Post
    Hi all

    I plan on using the FM video detector and part of the IF strip on an old BMAC satellite decoder RF board for a comms project. It would be really useful if I actually had a circuit for the thing!!

    Anyone out there who used to work with the old BMAC satellite stuff and still have circuits lying around. I need to know the IF freq and a circuit for the RF deck from the decoder.

    (Also posted in Decoders forum but not really a satellite related project)

    Cheers

    kuband

    I am not sure, but most old sat equipment had a 70MHz IF loop?? At least that is what several of my old analogue stb's have. I actually has a old Scientific Atlanta BMAC receiver. works ok as a analogue rx for 1250mhz fm Amateur Television transmissions.

    porkop

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    Do I need to remind you people that I am god ???

    I have the circuit. ( I think - got to find it again )

    I've forgotten the IF, but I don't think it is the industry 70MHz standard.

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    Quote Originally Posted by trash View Post
    Do I need to remind you people that I am god ???
    gee, please forgive me oh lord!

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    heheh ... I'm a very forgiving god

    I found the MAC circuit, but it is for the baseband MAC unit. I'm a bit dissapointed with myself that it doesn't have the IF stage.
    But not to worry, I found an old decoder which does have an IF loop and it is 45MHz which is a common NTSC IF.

    Depending on your gear, it may be 70MHz, 45MHz or Baseband.

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