[hpsdr] ANAN-100D RX2 and attenuator

[Helmut, DC6NY]

Hi Bill,

I suppose  it's a software issue, because each of the two independent
frontends of Angelia should have its own DAT-31 attenuator. Please check
schematics. Appreciate your kind reply.

73, Helmut, DC6NY


-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Bill Diaz
Gesendet: Montag, 3. Juni 2013 18:58
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] ANAN-100D RX2 and attenuator

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

      PowerSDR mRX 3.0.16 and Angelia 2.3 (1.8).

Using S-ATT with both RX1 and RX2 terminated at the antenna connectors, each
1 db increase in attenuation causes both RX meter signal levels to show a 1
db increase in the measured noise level until the attenuation exceeds 31 db,
then RX2 noise level drops approximately 31 db compared to RX1.  This
effectively removes attenuation in the  RX2 signal path when S-ATT = 32.

     I would prefer to have separate attenuators for each receiver, but
would be content to see the RX2 attenuation remain at -31 when the S-ATT
value exceeds 31.

Thanks,

Bill KC9XG

--
Politics is the gentle art of getting votes from the poor and campaign funds
from the rich, by promising to protect each from the other.

~Oscar Ameringer, "the Mark Twain of American Socialism."


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