> "George Henry" <ka3...@...> wrote: > Thanks to all who replied. Apparently, sometime between > the manufacture dates of our 2 repeaters, Spectrum changed > something in SCR200 receiver oscillator, such that the load > capacitance is substantially different. We ordered crystals > from ICM for the older of the 2, and whatever specs they > worked from, the crystal would not warp down to freq > without changing the trimmer cap value.
Yep... and there are a few different varieties of oven type assemblies. They can have different load specs and even different (non standard) temp break points. If you're shooting in the dark trying to order crystals... good manufactures can take a very reasonable guess at the crystal specs if you can supply a basic osc circuit diagram. The trick is having the right diagram or drawing one up. oh joy... s.
