One more point… Max power 16 dB would with 5V and we are using 3.3v on the AX5043.

On Feb 16, 2024, at 9:25 PM, Bob Stricklin via pacsat-dev pacsat-dev@amsat.org wrote:

I did test a board today and found it was transmitting every 30 seconds with a power level of about -28 dBm.

I spent some time looking at the code and found where the power level is set to ox0d in a config file and get AX reports this value.

I see in the data sheet for AX5043 where power should range from -10 dB to 16 dB and uses a 12 bit value to set the level. Possibly we are just adjusting upper 8 bits.

We will also be losing power in the differential to single ended converter and shaping circuit. I will probe on this a little more tomorrow but likely just leave it alone and move on for now to be sure and ship boards Monday.

I also see the 30 second interval in the code and some other comments about setting power but does not seem like this is being used.

I could not get a continuous tone and I did not spend time setting up a tight loop to transmit.

I did change the call sign in the configuration to mine.

Bob

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