[hpsdr] Problem Pennylane

[Helmut, DC6NY]

Hi Jean Marie

Perhaps you can check the OPA2674 itself for correct operation (no
oscillation, sufficient gain etc.). For this purpose disconnect the DAC/LPF
side at jumper JP2 and apply instead a small external signal around 0 dBm or
less at this port. If you still observe the issue check the other components
in the amplifier, if not you are collecting one of the 'digital' spurs due
to reduced crosstalk on the system wiring.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von F6ETU
Gesendet: Dienstag, 3. Dezember 2013 08:38
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] Problem Pennylane

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

Hello,

Sorry for my English deficient

I have a problem with my card Pennylane, I U19 (OPA2674) that broke, I
replaced it and I found the presence of a parasitic oscillation around
49 MHz. I states that before this problem, I found a spurious line around
this frequency but as the level was low I did not try to understand. I
checked the resistance of the assembly that is correct. If anyone has
encountered this problem or has an idea to solve it, thank you to answer me.

73 Jean Marie F6ETU
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