[hpsdr] Is Penelope U6 Toast?

[Scott Cowling]

Hi Mike,

One pretty easy way to tell if you smoked U6 is to see if it gets 
warm during TX.

I have managed to let the smoke out of one, and the result was 
visible damage to the chip.  Maybe a good visual inspection would 
give you an indication.

73,
Scotty WA2DFI






At 08:52 2012-02-10 +0800, Phil Harman wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>Hi Mike,
>
>Penelope is fine into a 50 ohm load - she does not like a short circuit.
>
>It does sound like you have let the smoke out of U6.
>
>73 Phil...VK6APH
>
>
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > I had a 50 ohm load on Penelope output and was changing the output when
> > it disappeared.  I am wondering if Penelope doesn't like a 50 ohm load
> > and therefore I need to change U6.  I do see output when I crank the
> > scope gain way up, but it is now about the same level as what I measure
> > at JP2.
> >
> > Thanks
> >
> > Mike, K7SR
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