[hpsdr] Penelope modulation

[Helmut]

Hi Gary,

You have good chance to drive the ADC of the AF-codec TLV320 into clipping,
when you apply an external 2 tone, especially if you use that 20 dB boost
amp. When using the test tab the 2 tones are generated in the DSP section of
PowerSDR completely independent of the Mic path. No overdrive the is
possible.

Please keep further in mind, that contrary to the DAC ALC of Pennylane,
Hermes etc. Penelope works in another way via the ‘sample control’. So
unlike these boards Penelope can show differences in TX and drive settings.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Gary
Beech
Gesendet: Mittwoch, 27. Januar 2016 00:26
An: hpsdr at openhpsdr.org
Betreff: [hpsdr] Penelope modulation

***** High Performance Software Defined Radio Discussion List *****

Hi All,

Thank you to all who responded to my previous post.

I now have made some progress with my Penelope board.

When running the two tone test from the built in test tab I get good output
from the TX.

If I apply a 1KHz signal from a signal generator to the Mic. my output is
about 20 dB down( just before saturation) on the built in 2 tone test.

When I connect a microphone to the same  Mic. input the same problem exists.

I have tried setting  the Mic. gain to maximum and the 20dB boost this has
not helped.

Thank you

73 Gary vk2kyp


I am sorry for previous  the HTML encoded post


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