The 327 vlbi run on 05jun11 reported a 1 Mhz
comb in the data. On 06jun11 we did some tests to see if
the problem was coming from the compressor monitor system (which
had been turned on during the 05jun11). The setup was:
327 receiver, center freq 327 Mhz, 302=352 filter installed
the horizontal dashed line at 542 seconds is where the compressor
monitor system was turned off.
The image has been smoothed and decimated by 6 so that the image
will fit on the computer screen. This changes the resolution bandwidth
from 5 khz to 30khz.
There are no obvious lines that stop at this point.
The black line is the average (500 seconds) with the compressor
monitor on.
The red line is the average (250 seconds) with the compressor
monitor off.
A birdie from the compressor monitor would have a black spike
with no corresponding red spike. I don't see any of these.
Summary:
No birdies were seen from the compressor monitor dynamic spectra
using 1 second and 30 Khz resolution.
An average spectra of 250 seconds and 5 Khz resolution also
showed no birdies from the compressor monitor.
processing:
x101/110606/chkcompressormon.pro
14/15apr11:Compressor monitoring system in
the lab (top)
The Compressor monitoring system was tested for rfi
by luis Quintero 14apr11 in the screened room. It was retested 15apr11
after some added shielding.The setup was:
Compressor monitor system inside huffman box.
agilent E4445A spectrum analyzer, 601 channels, and preamp on.
1 MHz to 10 Ghz. I've included the data from DC to 6gHz.