> From: Tjaart van der Walt SNIP > I have a feeling finding 1GHz counters won't be easy. You could probably > use an array of /2 prescalers and try to gate the signal, but it won't be easy. SNIP I think it is not difficult to make. I made once before using a 1.1 GHz %64 prescaler (Motorola MECL MC12022A) as the frontend. The final frequency will be about 15Mhz (a PIC can read up to 50MHz), which is easy for the pic to read. On my case, the value inside the prescaler was not needed. But using the already known technique to read the value of the prescaler, by self clocking, should not be too hard to implement. Reggie