Has anybody got any idea how I could configure the output over the radio link to transmit NMEA position data (rather than RTCM when in survey in mode).
What I am trying to do is use a Facet on a small boat and transmit its position back to a laptop.
Any help and suggestions on configuration would be much appreciated.
It’s very do-able. The DATA port will output whatever messages are enabled. During normal ROVER mode, the default is the 5 NMEA messages needed in most GIS software (GGA, etc). If you want to reduce the data over the radio, you can cut this back to just the messages (NMEA sentences) you want. See the messages menu for more info: https://docs.sparkfun.com/SparkFun_RTK_ … _messages/
Thanks Sparky. I didnt realise this and thought in rover nothing was going the radio. Will take a look.
Okay, maybe I am being dumb here. I am trying to use one radio with the USB connector directly into a laptop with the other radio connected to a Facet via the data port. I have garbage coming out of the USB serial (whatever baud rate), and only green light on solid (and orange USB flashing).
Is this coming in as binary, or am I doing something wrong? If I connect the USB end into an Express data port instead, I get TX/RX lights as you would expect.
Okay, answered my own question. I quick search found this thread indicating that the radios default to 57600 baud (https://electronics.stackexchange.com/q … try-radios) and a quick change of the data port baud to the same and it was working fine 
Just to update with this, I tested to around ~250m with the Holybro 915 Mhz radios. I just ordered two of the WRL-15597 LoRa antennas with some CAB-14911 antenna interface cable from Mouser UK and assume these were the correct parts to order to match with these radios? In addition, ordered the 433MHz kit as well, but haven’t seen any recommendation on antennas for that.
WRL-15597 should work fine with the Holybro 915MHz radios.
ordered the 433MHz kit as well
I don’t know what kit you’re referring to. Please post a SKU if possible. But 433MHz antennas are generally available.
Since you mentioned Mouser UK, I’m guessing you are not in the US. 433MHz is generally not allowed unless you have a HAM radio license.
These are the ones I have also ordered:
https://www.unmannedtechshop.co.uk/prod … v2-433mhz/
Interesting that the 900 Mhz range is the frequency historically not allowed in the UK/EU, but licensing has opened up somewhat. We have used 400Mhz radios offshore for years for telemetry links for towed buoys etc.