@gohan these values are just the ones i used and should filter lowpass at about 5.9 kHz.
The ripple on the LM2596s is usually arround 25-50kHz. (Depends on which clone you get. ;))

I'm no electrical engineer. Maybe @AWI can comment if there may be a more suitable component selection.

@ronnyandre The main reason for using a filter would be a crappy/cheap switching power supply.
I needed to use one of these filters on a cheap LM2596s (clone) module to filter the output to a nrf24l01+ pa/lna module.

Unlike @AWI 's solution i just added a second stage after the first stage (that is on the module).
http://blog.blackoise.de/wp-content/uploads/2016/03/lc-filter-schem1.jpg
L1: 3.3µH
C1: 220µF
Worked fine enough to get the nrf24l01+ pa/lna module working.

Short: probably. TrY soft spi for the nrf24

@karl261 with the original nrf24l01+ modules this is correct, yes.
To save battery use the lowest setting that still works without transmitting errors.

@karl261 the MAX Setting is the HIGH setting + a extra bit. The extra bit is ignored by the original nrf24l01+ chips. Some nrf24l01+ clones (also known as the SI24R1) are using this bit to switch into a higher mode.

I wonder if i ever solved this. :D
I remember i began drawing a schematic in KiCAD. Maybe i should look if i will find this and which mosfet i used in the schematic.

I like the magic blue smoke hole directly above the cap on your RPi case. XD

@AWI nice finnish :+1:
I wonder if the nrf24 shielding is still necessary in a metal enclosure.

@alexsh1 is this now officially called "the ugly fix"? :/
I should reconsider my naming choices. :D

@Mark-Swift does "appear" mean you actually measured it all the way to ground or that you believe that it should be well grounded?

@Mark-Swift there are basicly effects that could occur while you holding the module:
1.) You are forming a very small capacitor between you and the module.
Much unlikely to be the reason.
2.) You are functioning as an antenna for the module.
Also much unlikely, you would probably bring more noise then signal in the system.
3.) You function as a shield to the module.
More likely. I got the same behavior with insufficient shielding.
The shielding works ungrounded in low noise environment but needs to be grounded in a high noise environment.
This happens, as example, if a insufficient shielded switching power supply is nearby.

Please make absolutely sure that your shield is properly grounded!

@AWI there also 2 versions of the PA/LNA Modules out there. Which one do you tested?

hackaday caught wind on the tinfoil method.
http://hackaday.com/2016/05/31/fixing-the-terrible-range-of-your-cheap-nrf24l01-palna-module/
Maybe there also some points hidden in the comments that would help?

@Mark-Swift well.. maybe you should give the module a little bit more current. :)
I don't know which regulator the Uno uses but i would assume that it don't deliver enough current.

About the grounding.. better be sure, take your multimeter and check if the shielding has continuity to GND.

@AWI ah okay... well.. i'm still unsure if and which modules need the lower 3.3V level on CE.
It just happens that i only use 3.3V arduinos.. and the raspberry pi, which also has 3.3V logic.

@Mark-Swift and @AWI i never worked with the adapter board, but doesn't shift the adapter board also the signal levels down?

@Mark-Swift need to hold the module is often a sign for non solid shielding or the shield is not grounded.
Out of courosity what power supply are you using in front of the adapter board?

@Xyee-Cheah please post it on github or something similiar. This is unreadable. :S

https://gist.github.com/

@parachutesj as Jokgi said, you can't measure correctly the current of the modules with just a multimeter, you are losing peaks in the process.
Did you tried yet how far the shielded versions of the module reach? Would be great to have some sort of comparision. :+1:

@parachutesj i'm reading pretty much the same values on my multimeter, so nothing to worry about. ;)

@Jokgi it may be true that the ground filling seems to be quite good, but it seems like it needs also be shielded.
Without the shielding the module is influenced by its own signals and external signals.
There are also modules out there that have actually a shield added: http://www.aliexpress.com/item/Shielding-Case-10pcs-lot-nRF24L01-PA-LNA-wireless-communication-modules-with-antenna-2-4GHz-2Mbps-1000m/851058052.html
But i have not tested them yet.

By quantitative numbers you mean range?
On max transmitting power i don't got even 5meters because the PA TX seems to overload the RX and ack will never be received.
With the shielding i got arround 1000 meters free line of sight.

Both also delivered in their own post-car with security guards? :P