Am Sun, 17 Feb 2019 13:31:00 +0000 schrieb Folderol:

> On Sun, 17 Feb 2019 11:28:35 +0000 druck  wrote:
>
>>On 17/02/2019 11:19, Markus Robert Kessler wrote:
>>> I always wondered why I can only hardly get a connection to my WiFi
>>> router when running Rasperries -- Zero up to 3B+ -- in desktop mode,
>>> but there were no WLAN issues when running as ssh server.
>>>
>>> For doing this I formerly used an HDMI2VGA adapter (cheap 10 $ thing)
>>> and it did work. But I recognized that it got really warm, and so, I
>>> suspected that this energy came from the PC and not from the monitor.
>>
>>Connecting anything to the HDMI port causes an increase in power usage.
>>A few of my Raspberry Pi's are connected to TV's, and I see an increase
>>in SOC temperature of 4C when they are switched on.
>>
>>> I measured USB voltage output and found out that connecting this
>>> "adapter"
>>> will cause the output to go from around 5.2 V to 5.1 or below.
>>>
>>> This seems to significantly interfere with the internal WiFi module,
>>> and, hence, when connecting the monitor with the Raspberry using a
>>> "normal" HDMI-to-HDMI cable with no conversion, then the problems
>>> connecting to WLAN router were gone.
>>
>>I've not noticed any issues with the internal WiFi and just a TV
>>connected, but a HDMI powered dongle would be likely to affect it more
>>than just a TV.
>>
>>---druck
> Not seeing a problem here with a P3 BENFEI dongle from Amazon and a 3A
> PSU

"BENFEI"? With active power in? Like this one:

https://www.amazon.com/Active-Adapter-Benfei-Converter-Gold-Plated/dp/
B01KLKQN9U/

Yes, sure this might solve the issue -- mine is not actively powered,
because I was not aware of such problems when ordering...

Good lesson -- thanks!

Markus


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