[hpsdr] angelia questions

[Abhi A]

Hi Wully,

The PA gain distribution on Angelia is different, this was done to optimize
IMD performance, therefore, you will see a difference in output levels when
compared to Pennylane, the DAC configuration I believe is identical in both,

re the mic I have not encountered this problem, maybe it would be wise to
try a different mic just to make sure the problem is not with the
particular board, is the ring/tip jumper setting correct?

73s,
Abhi


On Thu, Mar 20, 2014 at 6:20 PM, wully <wully at bluewin.ch> wrote:

> Hi Abhi, hi all
>
> since some days I am experimenting with my new angelia. The diversity with
> the two LT2208 runs ok. But I have two problems, which are not yet clear to
> me.
>
> 1) A minor problem: the Transmit output is about a factor of four to five
> smaller, than with the same level when using Mercury/Pennylane (compared by
> using a tune tone), probably the defining current of the DA-chip is
> different?.
>
> 2) A more serious problem: the microphone does not work. When activating
> the mike, I see a noise pedestal in the parallel active rx, but when
> speaking into the mike, no change of this noise pedestal is occuring.  When
> using the same software, the same mike on my hermes (TAPR), the modulation
> is clearly seen. So, it does not seem to me a software problem (mike boost
> is actively set through the USB-Protocol). The configuration of the mike
> input is the same in both cases (an Electret mike, using the bias).
>
> I will further investigate.
>
> Comments about this behavior are welcome.
>
> 73, hb9epu
>
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