Hi Tomisona,
Reach receivers don’t provide precise ephemerides data, and you can post-process logs in our version of RTKLib fine without using it. However, if you have a file with the precise ephemerides, you can upload it to RTKLib. It should be of help if you survey on long baselines.
Thanks for your comment on the automatic uploading of the precise ephemerides via the Internet. At the moment, this data can be uploaded to our software only manually. However, we’ll think about implementing this feature in the future.
Edited: Reach provides ephemerides in the .nav file. Here the precise ephemerides are meant.