[hpsdr] Fwd: Re: pihpsdr

[Scott Traurig]

John makes a very good observation. At the extremely low price points of
these commodity USB power supplies, one cannot always believe the spec. I
went overkill and obtained the Adafruit 10A supply with a 2.1mm coaxial to
USB adapter.

The other possibility is a poor USB cable of some sort. 28AWG conductors
don't do very well even when a 10A supply is at on end. Depending on how
you are wired up, that could be a factor. I try to make it a point to
obtain USB cables for power critical applications that have 22AWG
conductors or larger.

However, usually you will see the yellow lightning bolt symbol on your Pi
display if voltage is on the low side. Perhaps not always.

73,

Scott/w-u-2-o


On Sun, Feb 5, 2017 at 1:27 PM, John Melton <john.d.melton at googlemail.com>
wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Bob,
>
> I have found some 2 amp supplies are not what they say they are!
>
> -- john
>
>
> On 05/02/17 17:48, Bob Cowdery wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Jan. Its a 2A supply so should be fine. I've tried knocking WiFi and
>> Bluetooth on the head but no luck so far.
>>
>>
>> On 2/5/2017 5:42 PM, dl2hbj at gmail.com wrote:
>>
>>> Hi Bob,
>>>
>>> I had a similar problem which was gone with a more powerfully power
>>> supply.
>>>
>>> Jan, DL2HBJ
>>>
>>
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