Radio temperature
Posted: Sun Nov 08, 2020 11:35 am
I'm trying to add a system to monitor the internal temperature of the radio
The CPU has an internal temperature sensor, but its not very accurate. The data sheet quotes accuracy of +/- 4.5 deg, but I think this is worst case.
I've made a special version of the firmware, which shows the raw temperature data value from the CPU on the Battery Screen, and also on the VFO screen during Tx.
The version is here
https://drive.google.com/drive/folders/ ... sp=sharing
I'd be interested in any data points that people can give me. i.e Temperature of the chassis of the radio, and the raw temperature value
Ideally, I'd like more than one data point per radio. e.g. a Data point at 20 deg C or 15 deg C and another at 40 or 50 deg C
These are the data points I have captured from my radio,by putting a thermocouple probe between the battery and the chassis.
The batter is not fully in its normal position, and is held at the bottom by an elastic band.
The radio is also wrapped in a towel, so that the heat is contained inside the radio.
This data is for a GD77.
I've noticed that the Baofeng DM-1801 values are a bit different, and the Baofeng RD-5R values are different from the DM1801 and from the GD-77
BTW.
Width the raw temperature data, initially the CPU seem to take 15 or perhaps 30 seconds to get to a stable temperature.
Anyway. Any data would be interesting, and useful.
Thanks
Roger
Edit. If anyone wants to read the technical data sheet (Application Note) about this.
See
https://www.nxp.com/docs/en/application ... &pageNum=1
But the values in the Application Note are much lower than values from the CPU in the GD77
The CPU has an internal temperature sensor, but its not very accurate. The data sheet quotes accuracy of +/- 4.5 deg, but I think this is worst case.
I've made a special version of the firmware, which shows the raw temperature data value from the CPU on the Battery Screen, and also on the VFO screen during Tx.
The version is here
https://drive.google.com/drive/folders/ ... sp=sharing
I'd be interested in any data points that people can give me. i.e Temperature of the chassis of the radio, and the raw temperature value
Ideally, I'd like more than one data point per radio. e.g. a Data point at 20 deg C or 15 deg C and another at 40 or 50 deg C
These are the data points I have captured from my radio,by putting a thermocouple probe between the battery and the chassis.
The batter is not fully in its normal position, and is held at the bottom by an elastic band.
The radio is also wrapped in a towel, so that the heat is contained inside the radio.
This data is for a GD77.
I've noticed that the Baofeng DM-1801 values are a bit different, and the Baofeng RD-5R values are different from the DM1801 and from the GD-77
BTW.
Width the raw temperature data, initially the CPU seem to take 15 or perhaps 30 seconds to get to a stable temperature.
Anyway. Any data would be interesting, and useful.
Thanks
Roger
Edit. If anyone wants to read the technical data sheet (Application Note) about this.
See
https://www.nxp.com/docs/en/application ... &pageNum=1
But the values in the Application Note are much lower than values from the CPU in the GD77