Hi Tom,

I'm impressed to know of the strange problems you've been able to track 
down!  If nothing else, your adventures really illustrate just how 
sensitive these things are.

I'm not ready to conclude that the problem is in the electronics, or 
that it isn't.  But if I had a spare board to swap out, I could 
unambiguously rule it out as a suspect if it didn't cure the problem.

I too have my share of known noise sources, like wind in the trees, the 
trash truck going up the street and stopping at each house, cars going 
in or out of my driveway or the drive at the house next door, and my 
infamous cataclysms.  Can't do much about any of them, but they're at 
least understood.

If I wasn't so stubborn, I'd just build something else.  But what I 
really want is an explanation for what has been going on.  Your 
effective trouble shooting gives me hope.

Larry

On 6/21/2012 12:38 AM, Thomas Dick wrote:
> Don't be too quick to blame the electronics. Sometimes there isn't an 
> immediate explanation. One unique situation took over two years to 
> figure out. When the 4 acre lake behind the house freezes solid, the 
> water drains out from under the ice. As the water disappears, the ice 
> cracks. If you are outside you can hear this happening. I recorded the 
> time while walking the dog one time and went in to check the data. 
> Sure enough, the cracking of the ice was causing one of my unusual 
> data sequences. On one occasion a USGS team came through my side of 
> the city (about a mile away) with a thumper truck creating seismic 
> waves. It was two days later when a local newscast did a story on the 
> truck's activity that I figured out what I was seeing. Very strong 
> winds used to cause me trouble. (I am talking 50  to 70 mph gusts.). 
> Thunder (close by) occasionally is detected as well as the Blue Angels 
> during shows on our riverfront. Quarry blasts used to arise my 
> interest but now I find them an irritation if an earthquake arrives at 
> the same time...and that often happens. I had to turn off my 200 watt 
> 10 meter repeater because of radiation interference when the last sun 
> spot cycle. Oh, yes, one of my first successful discovery. There is a 
> walnut tree about 10 ft from the house and 25 ft from the seismic 
> units. When the walnuts fall off the tree and hit the screened-in 
> porch roof, a sharp peak occurs on the short period units.
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