Hello,
Where do we buy the nRF51922 DK / EK kits? I do not see any purchase links online.
Also, how flexible is the ARM core for programming ?
Thank you!
Hello,
Where do we buy the nRF51922 DK / EK kits? I do not see any purchase links online.
Also, how flexible is the ARM core for programming ?
Thank you!
Please try contacting a distributor for your country first, and check with them. You can find such distributor by selecting your country in the drop-down on the bottom of our main page, http://www.nordicsemi.com.
If the distributor listed can not help you, you should contact our regional sales manager for your area. If you don't have his contact information, please send me a private message with your location, so that I can give you the correct one.
Thank you very much for the reply. I have contacted the distributors for our region as advised.
I see that the part has a receive sensitivity of about -90dBm for Ant and -93dBm for Bluetooth signals. I understand antenna design, orientation etc can affect the performance. But is it possible to augment to the RF performance outside the SoC ? Is it recommended? Please let me know.
Thank you!
-90dBm is ~1 pico Watt and -93dBM is ~0.5 pico Watt if my brain is working properly today. I would think that the noise floor would be such that it would be hard to keep all factors equal (transmission power, receiver sensitivity, encoding, bandwidth, bit rate) and achieve much better performance.
Maybe you could refactor your question -- what are you looking to achieve?
-m
Assuming a heart rate monitor or sensors transmitting at that power level, the average distance of reliable communication is probably around 30m. I am just trying to understand if this distance can be improved(say by 10m or more) by improving receive sensitivity of chip and link budget. The chip may already be doing a multi-point optimization of what can be achieved. So I am keen on knowing what avenues such as better antenna design etc that can be explored to achieve this and trade-off issues.
This would have been better off as a separate question, but all our experience tells us that if you want to improve range, you need to do it on the transmitter side, by adding a power amplifier (PA). Adding an LNA on the receiver side most often doesn't actually give any increased range, since even a good LNA tends to amplify noise more or less as much as it amplifies the signal, and by that actually gives roughly equal (or possibly worse) signal-to-noise ratio, in total not giving any additional range.
If you're satisified with the answer to the original question here, I'd be happy if you could click the "Accept as answer" below it, to mark this question as solved.