Yepp. Size and Pinning are identical betweenthe two modules. It is almost that I suspectthat it could be a case of de-facto standardwould it not have been for the serial dataformat. One unit uses "Odd", the other "None" as parity. Only the 1PPS gets through. I have found used original Trimble boardson eBay. I will study the RAPCO manual to seeif there is a possibility to change the communicationparameters to and from the GPS-module. Saving this for a rainy day. Once again - Thanks for all info! Ulf KylenfallSM6GXV