PostFrontal Forum
PostFrontal Forum
PF Home | International_Forum | Profile | Register | Active Topics | Members | Search | FAQ | Upload image
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 LK8000 International Support
 Hardware
 Project Radioactivity
 New Topic  Reply to Topic
Previous Page
Author Previous Topic Topic Next Topic
Page: of 4

AlphaLima
Moderator

Germany
1340 Posts

Posted - 14/07/2017 :  08:36:44  Show Profile  Visit AlphaLima's Homepage  Reply with Quote
OK Marco,
here some hints:
-Don't forget a switch to "hook off" the Wifi from the radio in case of malfunction and for legal aspects! (even if I never needed it in three years)

-Be careful with the RF noise of the DC/DC Converter, little ferrite rings are mandatory to prevent noise in the radio.

-Check and adjust the output voltage of the DC/DC before connecting it

Edited by - AlphaLima on 14/07/2017 08:43:01
Go to Top of Page

Marco from Hangar 5
Aquila imperiale

Netherlands
680 Posts

Posted - 14/07/2017 :  12:00:43  Show Profile  Reply with Quote
Thanks for the tips!

I do not really understand why a "hook off" switch is required. If it malfunctions.. well, it mallfunctions and is communication with the KRT2 not possible, but the radio should still work fine, because only the RX and TX (and power) are connected to the wifi module, right now these pins are also not connected to anything. Anyway, a switch in the powerline would do the trick right? What do you mean with "legal aspects"? Note that we do not modify the radio at all, we just make use of a feature that is already present.

I had a look at the power supply, and it contains two "HF filtering capacitors", this is not enough to get rid of the HF noise? But better safe than sorry, will ad two ferrite rings to the in and out going power wires. Would the use of shielded wiring help?

I noted the adjustable power output potentiometer on the power supply :-) will adjust the output to 3.3V using a multimeter, while hooked up to a fully charged 12V battery.

BTW, I think this power supply is also nice fo charging the LK8000 device

Marco
BU (PH-588)
Mini Nimbus HS7, s/n 039
http://www.zweef.nl/
Zweefvliegclub Den Helder, NETHERLANDS

Edited by - Marco from Hangar 5 on 14/07/2017 12:54:12
Go to Top of Page

AlphaLima
Moderator

Germany
1340 Posts

Posted - 14/07/2017 :  15:39:07  Show Profile  Visit AlphaLima's Homepage  Reply with Quote
quote:
Originally posted by Marco from Hangar 5

Thanks for the tips!

I do not really understand why a "hook off" switch is required. If it malfunctions.. well, it mallfunctions and is communication with the KRT2 not possible, but the radio should still work fine, because only the RX and TX (and power) are connected to the wifi module, right now these pins are also not connected to anything. Anyway, a switch in the powerline would do the trick right? What do you mean with "legal aspects"? Note that we do not modify the radio at all, we just make use of a feature that is already present.


Imagine the PNA Software hangs and is tranmitting permanetly (which is not programmed but theoretically possible). Or the frequency is changing permanently. The only way out in flight would be to turn off the radio.

quote:

I had a look at the power supply, and it contains two "HF filtering capacitors", this is not enough to get rid of the HF noise? But better safe than sorry, will ad two ferrite rings to the in and out going power wires. Would the use of shielded wiring help?


You should do all you can to reduce RF, shielded wires and ferrite on both ends.

quote:

I noted the adjustable power output potentiometer on the power supply :-) will adjust the output to 3.3V using a multimeter, while hooked up to a fully charged 12V battery.


double check, also when load is hooked on.

quote:

BTW, I think this power supply is also nice fo charging the LK8000 device


Not at all, PNAs and Smart phone need 5V not 3.3V.

For that purpose UBECs are the best choice, e.g:
https://www.amazon.de/HOBBYWING-Switch-Mode-Niedrigster-RF-Rauschen/dp/B008ZNWOYY/ref=sr_1_2?ie=UTF8&qid=1500039418&sr=8-2&keywords=ubec+5v+3a

Edited by - AlphaLima on 18/07/2017 12:51:25
Go to Top of Page

Marco from Hangar 5
Aquila imperiale

Netherlands
680 Posts

Posted - 14/07/2017 :  20:18:05  Show Profile  Reply with Quote
Ok, got it, thanks!

I thought the power supply was suitable, because you can set the output to 5V as well.. I mean the chip is suitable, another one, beside to the one used for the wifi of course, not the same one :-)

Marco
BU (PH-588)
Mini Nimbus HS7, s/n 039
http://www.zweef.nl/
Zweefvliegclub Den Helder, NETHERLANDS
Go to Top of Page
Page: of 4 Previous Topic Topic Next Topic  
Previous Page
 New Topic  Reply to Topic
Jump To:
PostFrontal Forum © PostFrontal - La community del Volo a Vela Go To Top Of Page
This page was generated in 0.14 seconds. Snitz Forums 2000

PostFrontal S.A.S. di Giuliano Golfieri & c. - P.I. 05264240960