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Changing the RF output channel on Pana 3/4=in VCR?

Discussion in 'Electronic Basics' started by DaveC, Jun 7, 2004.

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  1. DaveC

    DaveC Guest

    This Panasonic NV-2110 3/4-inch VCR outputs RF on CH 5 or CH 6
    (switch-selectable). There is no other choice of output channel. (This is an
    (*old* VCR, circa 1973, much discrete circuitry.)

    Is the determination of frequency as simple as changing the xtals for these
    channels? (RF mod circuit uses two xtals for these channels.)

    If I want change the circuit such that video is output to RF CH 3 or 4, is
    this a straightforward xtal swap? Recal required afterward?

    Has anyone done this before?

    Thanks,
     
  2. Joerg

    Joerg Guest

    Hi Dave,

    It is unlikely going to be that easy. Usually there are also some
    resonant circuits, or at least one, and these frequencies are pretty far
    apart.

    Here is what we did: I bought a modulator at Radio Shack for about $40.
    It's output frequency can be programmed digitally via push button to any
    channel in the UHF range. Then video and audio is fed from the VCR into
    that modulator. Its RF signal is fed into the house distribution and now
    we can watch videos at any TV in the house.

    Regards, Joerg
     
  3. Kevin Carney

    Kevin Carney Guest

    Not what you want exactly but, take the RF output and put it into another
    VCR. Select Channel 5 on that VCR's tuner. It will now take your old units
    Channel 5 and put it out on Channel 3 or 4 (switch selectable). Or use the
    newer VCR's A/V inputs if the old unit has A/V outputs. You probably have a
    VCR or two lying around, so it won't cost you much.
     
  4. DaveC

    DaveC Guest

    Hi, Joerg,
    Yours is probably the most practical solution. We have several of these
    machines (for back-up). When the current one dies, we'll probably not repair
    it. My solution would require modifying each machine for CH 3/4, a pain.

    Thanks for your ideas.
     
  5. Joerg

    Joerg Guest

    Hi Dave,

    If you go for that just make sure the channel setting is not lost during
    a power outage. The Radio Shack version we have does keep the channel
    memorized. You can also select cable frequency mode or terrestrial
    (normal) TV channels. But not VHF, it is only UHF.

    Regards, Joerg
     
  6. jakdedert

    jakdedert Guest

    After reading all the posts so far, the question not asked is 'why use the
    RF output at all?'

    jak
     
  7. DaveC

    DaveC Guest

    TV, not monitor. Input connector is only RF not baseband.
     
  8. DaveC

    DaveC Guest

    Joerg,
    The RS model 15-1214 has switch that you choose CH 3 or 4. Nothing to forget:

    http://tinyurl.com/37tgk

    Thanks,
     
  9. Joerg

    Joerg Guest

    Hi Dave,

    If you can live with Ch3/4 that would be even cheaper. But we couldn't
    because we wanted to distribute into the house coax network and there is
    a strong station on Ch3, and a weaker one on Ch2. Other than that our
    box looks similar, except for a couple 7-segment displays and progamming
    buttons.

    Regards, Joerg
     
  10. Lenny

    Lenny Guest

    You could also come out of the 3/4 " machine with video and audio.(I
    doubt that it will be a stereo output) and put that into the ch 3
    modulator and you will have ch 3 out. Lenny Stein, Barlen Electronics.
     
  11. Guest

    That is damn ingenious! You see VCR's lying around for garbage pickup,
    so you could get one for nothing.
     
  12. Is this a joke?You have a working 30-years old VCR?And you want to keep
    it?Give it to seomeone poor.A brand-new stereo philips VCR cost only 95
    euro.

    --
    Dimitris Tzortzakakis,Iraklion Crete,Greece
    Analogue technology rules-digital sucks
    http://www.patriko-kreta.com
    dimtzort AT otenet DOT gr the return adress is corrupted
    Warning:all offending emails will be deleted, and the offender/spammer
    will be put on my personal "black list".
     
  13. Tim Auton

    Tim Auton Guest

    How do you know the OP isn't poor?


    Tim
     
  14. DaveC

    DaveC Guest

    This is a 3/4-inch VCR, no longer available new. Used ones are available on
    e-bay for about $100, but they all will have the same issues with display
    interface.
    The organization is a non-profit, always a bit low on funds.

    (Your question shows an enlightened view of the economic world.)
     
  15. Kevin Carney

    Kevin Carney Guest

    Dave,
    Many people never saw 3/4" Umatic Video Players / Recorders. I worked on a
    lot of Sony, some Panasonic & JVC and a few NEC. Sony was the best and they
    probably still have parts available.

    --
    change .combo to .com for correct email

    ***************************************************
    "We ought always to know precisely why a given job
    is done in a particular way, and why it is done at
    all, and why it can't be done more efficiently,
    if it must be done at all."-- T.J.Watson

    ***************************************************
     
  16. Yes, you can search all US museums for that xtal.

    --
    Dimitris Tzortzakakis,Iraklion Crete,Greece
    Analogue technology rules-digital sucks
    http://www.patriko-kreta.com
    dimtzort AT otenet DOT gr the return adress is corrupted
    Warning:all offending emails will be deleted, and the offender/spammer
    will be put on my personal "black list".
     
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