Thursday, August 24, 2006

Stanford SID Monitors

Stanford SID Monitors

Lorne,

Same here....I could not get my image to post in the Comment Section.

Here is my data for 8/20/06. I can see signals in the graph, but the noise is still high. I may need to re-locate the antenna, or build the larger antenna to improve sensitivity. What size antenna do you use for sid monitoring. BTW...I monitor NAA in Maine. My location is Bowling Green KY 65 miles north of Nashville TN.

Mike, kw4mac

3 Comments:

Blogger Lorne Davis said...

Mike,

Our antenna, a big PVC 'X', is about 80 inches tip to tip across an arm. In other words, it's about the size needed to amuse but not alarm the neighbors. We have 47 turns. See the picture in an earlier post.

I'll post a new blog comment with two pictures that compare the Utah State to the TLU antenna. You can then compare to your results for 8/20/06.

I've learned more than i can understand yet. The dawn chorus, dusk effect, day convexity, and night-noise all seem to be highly dependent on where you are. The occurence of daytime sid blips are independent of geography. Perhaps their magnitude and exact timing could be used to tomographically isolate the area of first interaction of the flare with the earth?

I think that there may not be a best antenna. Perhaps the style should vary with locale and transmitter and ambient noise. We can all learn from each other.

Interestingly, I think that the background noise from your antenna, our TLU antenna, and the USU antenna is all about the same, 0.1 - 0.15 'units' on the sid monitor. The noise is a function of rf gain. The signal is what is really different between the 3 observing stations.

I have injected clean signals into my sid monitor. There is no observable noise in the measured signal. By the way, the monitor seems highly selective: 100 Hz offset on either side of the xmitter frequency attenuates the observed signal by least 10 dB.

I'll post the data comparisons separately.

2:08 PM  
Blogger Connie said...

This comment has been removed by the author.

12:14 PM  
Blogger Connie said...

Hi Lorne and Mike,
Our current sid data looks very similar to the above graph and we don't know why. If it is just noise, how do we minimize it? Thanks!
Karen and Malaika

12:18 PM  

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