Suggestions about proper usage of vk-200 choke
Information on the VK-200 can be found At this link  


  VK200 inductor with 2½ turns, suitable for HF, VHF e UHF, for > 7 MHz frequencies.  Impedance: 280Ω at 10 MHz  


From the above information the inductance can be calculated to be about 4.4 uHy.  

You did say it was for HF (high frequency), which might be anything from 80 meters to 10 meters). You haven't mentioned what frequencies you are trying to filter. 

You could make a simple filter for your 5 volts as follows
EDIT  : added C6, C7, and Earth Ground :  







simulate this circuit &ndash; Schematic created using CircuitLab

I chose capacitor values that might work for you. Better design could be made if there were particular frequencies to filter.  

I haven't shown any filters to earth since I don't know your power supply nor your up converter earth ground situations.  

ADDED after first 3 comments : Making sure to show difference between Earth Gnd and GND (power supply common).
You can also use shielded cable from the 5 volt power supply (the filter built into the power supply). The shielded cable should have only ONE end of the shield connected to Earth Gnd. Connecting to Earth Gnd at both ends creates a ground loop which can pick up additional noise. Perhaps connect the shield to your metal box upconverter and then the upconverter box (enclosure) is to Earth Gnd. 

Look at your entire system and see if there are multiple Earth Gnd connections which are causing ground loops.  Try to design for a single point connection to Earth in your entire system.