Can you do a two point injection on the modern ham type rigs?
i.e. Directly into the vco's control line and directly into the pll's
reference oscillator. That will help with the problem of the pll
"fighting" the modulating signal. You can see the effects of this when
viewing the eye pattern.
Randy
Bob Nielsen wrote:
>
> Several years ago I tried 9600 with a TM421A, which is of the previous
> Kenwood generation. You want to inject it at the same point as the audio
> is fed to the modulator. The results weren't very good and some
> stations were unable to copy my signal. I expect that the PLL bandwidth
> is high enough to partially track out the modulation (and slowing down
> the PLL would make the tx/rx transitions time too long). These are
> typical problems with trying to modify synthesized FM radios (or with
> using the so-called "9600-ready" radios).
>
> Bob
>
> --
> Bob Nielsen Internet: [EMAIL PROTECTED]
> Tucson, AZ AMPRnet: [EMAIL PROTECTED]
> DM42nh http://www.primenet.com/~nielsen
