The Natural Philosopher  wrote:
> On 17/02/2019 11:28, 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.
>>
>
> I have broadcom chipsets in my laptop and in my Pi Zero. Both display on
> reasonable signal levels and reasonably CONSTANT signal levels massive
> variations in wifi speed - from 1Mbps to 54Mbps.
>
> My conclusion is that broadcomm chipsets are total crap - at least under
> linux.
>
>

Band congestion could be an issue.

--
-michael - NadaNet 3.1 and AppleCrate II:  http://michaeljmahon.com

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