This indicates the frequency ISM frequency bands that the modems are intended for in MHz. Modems of different frequency bands cannot interoperate.
+, u, X, uX and uX-SMT
+: The + models are an update with some minor improvements of the very first RFD modem designs. They can interoperate with the original modems and u modems of the same band. This product is maintained for legacy systems but is not undergoing active development and updates.
u: The u models are a small light modem for use in situations where size and weight are critical. These modems have a reduced maximum power of 20 dB but otherwise all the same features as the + models.
X: The X models an newer design with a new processor and added features over the + and u models such as RC and S.Bus pass through and GPIO pin mirroring with ongoing improvements. This is the model integrated in to other RFD products such as the TX Mod. They cannot interoperate with older modem types.
uX: The uX is a size and weight reduced version of the X modem. It has a limited number of GPIO pins but otherwise operates the same as the X model. Unlike the u model this modem is capable of the full 30 dB output power.
uX-SMT: The uX-SMT models are solderable surface mount modem for system designers wanting to integrate RFD modems into custom electronics solutions. All GPIO and UART functions are available as the solder pads. The software functions are identical to and interoperable with X and uX models.
Country Codes (-AU etc)
The -XX country codes after X, uX and uX-SMT models indicate modems that have been locked for compliance with different countries regulations. These modems may have some features or options removed and are not compatible with all firmware types. New variants may be added in the future.
Country codes.
AU: Australia
NZ: New Zealand
US: United States of America (also applies to Canada)
EU: European Union
IN: India
Modem and Firmware Datasheets
Modem and firmware datasheets for our various products can be found at the following link.
I did a 60 day tour last year from Portugal all the way to Austria and all the countries in the middle. Love European chill lifestyle.
One of my hardware design engineer is in Ireland (Dublin). I was planning to visit Ireland and Scotland this year, but this dang coronavirus screwed things up. Hopefully next year.
