[HomeBrew] Pll Idea, needs sanity check

Chris Trask christrask at earthlink.net
Thu Apr 1 22:13:56 EDT 2010


    <<SNIP>>

>
> One alturnative which still requires a uP, but not a programmable PLL
chip,
> is to mix down the VCO frequency low enough for the uP to count it and use
a
> programmable counter inside the uP to do the divider.
>
> 70's vintage CB's often used a PLL with extra inputs for the channel
> selection which would put them into the 10M band. Might be worth trying to
> find out if this is one of them or not. It is also possible that a rig of
> that vintage uses a different mixing scheme than the more modern ones I'm
> familer with.
>

    See if this provides a solution:

    http://www.home.earthlink.net/~christrask/Paper023.html

Chris

     ,----------------------.       High Performance Mixers and
    /    What's all this     \    Amplifiers for RF Communications
   / extinct stuff, anyhow?  /
   \  _______,--------------'           Chris Trask / N7ZWY
  _ |/                                  Principal Engineer
 oo\                                  Sonoran Radio Research
(__)\       _                             P.O. Box 25240
  \  \    .'  `.                     Tempe, Arizona 85285-5240
   \  \  /      \
    \  '"        \                 IEEE Senior Member #40274515
     .       (  ) \
      '-| )__| :.  \              Email: christrask at earthlink.net
        | |  | | \  '.       http://www.home.earthlink.net/~christrask
       c__; c__;  '-..'>.__

                       Graphics by Loek Frederiks



More information about the HomeBrew mailing list