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From: | Marcus Leech |
Subject: | [Discuss-gnuradio] Radio astronomy data |
Date: | Tue, 13 Mar 2007 00:04:00 -0400 |
User-agent: | Thunderbird 1.5.0.10 (X11/20070221) |
the constellation Puppis. http://www.propulsionpolymers.com/radioastronomy/sgr_a_pavg20070312.pngThe three days diverge somewhat here and there--due almost entirely to differences in diurnal heating/cooling cycles of the LNAs at the feed. I'm going to be adding temperature compensation in the receiver code that will allow me to tweak the effective gain, based on the current ambient temperature of the LNAs. I'll do that entirely numerically, since tweaking the hardware gain won't provide anywhere near fine-enough control. GaAsFET LNAs change gain with temperature, but only to the tune of a small fraction of a dB/C.
I'll "outsource" the thermal-probe interface to an outboard process, and plug it into the gr-radio-astronomy receiver through a named pipe that I'll read during my 1-second timer code.
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