David I. Emery wrote:
And there are a number of other emitters in that area you might
just have lucked into... (especially some that might show up as images
with a high gain and relatively broadband LNA feeding the DBSRX tuner).
I'd not assume C or X band, there are radars at L and S band too.
Indeed, the C-band radar was just must first guess, since it's
relatively "local", and has
high peak power.
In chasing down another problem (a curious anomaly in dynamic range), I
think I got rid
of my pulsy little friend. I reduced the system gain by 12.5dB or
so, which means that
I'm using up less dynamic range just digitizing system noise. I'm
still able to see
astronomical sources just fine, including picking out the hydrogen
line from the
spectral display. For now, I'm assuming that the mixers in the
MAX2118 were
over-driven, which was increasing their tendency to produce images.
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