That was my point. I believe QST came to a similar conclusion. The
allmode transceivers tend to use a heterodyne scheme for transmit so
that you modulate a crystal oscillator stage rather than the PLL. As I
recall, an early Azden FM transceiver did this as well and had
reasonable 9600 performance.
Otherwise there is a trade-off between poor frequency response (fast
PLL time-constant) and poor T/R switching times (slow PLL
time-constant). There are ways to compensate for the frequency
response, but it's a bit tricky and may not be all that stable in a
production-line radio.
TEKK and some other data radios work fairly well, as do some converted
crystal-controlled commercial radios, such as Motorola Mitrek.
>
> In the end you're probably better off with dedicated designs like
> the T7F kit by Holger Eckhardt.
Do you have a URL for this?
Bob
-- Bob Nielsen, W6SWE (RN2) Internet: srjyrqft@press.net Tucson, AZ DM42nh AMPRnet: xejz@hummuli.ee QRP-L #1985 http://www.primenet.com/~nielsen