Not having one of these radios makes it a little trickier, but I have downloaded the latest version of the Radtel CPS from the Radtel website and that proves interesting. Firstly, as it comes as a stand alone .exe file that doesn't need installing!
For your frequency entry, here is the setting that is likely truncating your entries;
Radtel1.png
On CPS its defaulting to 6 digits, so guessing on the radio (if you are not using CPS) it will also default to 6.
For TX and RX frequencies - I have been all through the settings in the CPS, and there is not one for auto repeater offset, i.e. -600 kHz. So frequencies are set independently.
Radtel2.png
Here, I have created 2 channels on the channel tab with the frequencies for TX and RX both as I think you are looking for.
For saving - Not sure how you would do that directly on the radio, if indeed its even required. On CPS, you would simply save the file to your PC, then write the file to radio and that would then be it programmed.
Hope that helps.
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