Hello Community
i have a big problem with the DC-DC Converter on the CH2I Raspberry Pi Shield
https://twitter.com/JoachimHummel/status/1040371745822306307
Have anybody any idea how we can cancel this big noise on 145 Hz Band ?
Because the Lora Gateway and 2 Meter Hamradio Antenna is installed on the same place.
Best regards Joachim aka DG8RAD
another DC-DC Converter same issue.
The Problem is not the CH2I Board .
Twitter Not usable ??
but your link to your twitter then where you say
’ Bullshit Raspberry Pi Shield produce big noises on 144-146 MHz Ham radio Frequency. NOT recommended, unusable! ’
you think lorawan is a problem ? or your antenna’s are to close ?
No matter my comment … the Problem is not the CH2I Board even the posting.
After last weeks the result is different and we have found out the issue is produced by the DC-Converter.
The problem is on the lora gateway , i am not stupid !
I didn’t say that you are stupid… I just read your twitter posting 
So your complaints are about the dc-dc ON 880A lorawan board ?
(or is it possible that it’s coming from the powersource ?)
Guessing games are not helpful.
And the noise is measurable in a radius of 5 meters with SDR-Radio and two different gateway
almost the same hardware but different DC-Converter and different powersupply.
Here is the waterfall diagram what displays very clear the noises.
Screenshot from 09/25/2018
Hmm very friendly, I only try to help.
You stated that is coming from the 880A board, so I suggest you contact the manufacturer… this has nothing to do with the TTN network
I post this issue maybe others gateway providers have the same problem
and have to check with SDR-Radio maybe there is the common problem on many gateways.
Your comments doesn’t help to solve the issue. I am not a beginner but you speak with me like an idiot.
Well the main thing is your rating rises here in the forum, because you comment almost every topic here in the forum!
sorry I disagree… and I close this topic.