Low output power on DevBoards

RE: Low output power on DevBoards

haakonsh — Fri, 17 Dec 2021 11:22:28 GMT

Hey Rashid,

You can run the Radio Test Example, with arguments 'start_channel 19' followed by 'start_tx_carrier'.

BR,
Håkon.

RE: Low output power on DevBoards

Rashid Talib — Fri, 17 Dec 2021 09:30:47 GMT

Hi Haakonsh

Thanks for your reply.

I'm already seting up the radio to transmit an unmodulated carrier (using the DTM settings mentioned before). I'm quiet sure that both my setup und the firmware is working properly. If you could provide a standalone firmware that generates a CW at channel 19 with 0dBm output power, I will repeat the measurement and let you know the result.

Best regards

Rashid

RE: Low output power on DevBoards

haakonsh — Fri, 17 Dec 2021 09:22:14 GMT

You need to set up the radio to transmit an unmodulated constant carrier. A modulated radio packet will not have 100% duty-cycle and the measured output power will show as lower than expected.

[quote user=""]

For me there are three options:

The chips are not working properly
The ANT pin is not properly matched to 50 ohms
The Murata socket / probe combination lead to high loss

[/quote]

It's not very likely that all of the devices are not working.
The DK's are properly impedance matched to 50 ohm.
There is some loss in cabling and connectors, but it's usually closer to 0.5dB. Murata is a good manufacturer, I'd trust them to make a good cable.