Sit down and whipped up a 40khz oscillator. If nothing else gives me confidence the dish is working. The dish is pretty much spot on and if go by max signal its very accurate at 30'. At some point ne
Chuck et al, For a super accuate method of tuning up a US dish you may want to try this: Use a flashlight some distance away (even 50ft) from your dish that is in a darkened room. If your dish is eve
Unfortunately I painted the dish black many years ago.... For a super accuate method of tuning up a US dish you may want to try this: Use a flashlight some distance away (even 50ft) from your dish th
If memory serves me correct, playing around with an ultrasonic receiver years ago I noticed that car keys gave off quite a bit of 'noise' (ringing and jangling) when shaken ... perhaps another easy s
Just rubbing your fingers together works very well. And yes, car keys, walking in grass, bees, etc all generate ultrasonics. Charlie, N0TT _______________________________________________ RFI mailing
If you want to have some fun and generate lots of high intensity ultrasonic signals pass some high pressure air through a small orifice or over a sharp edge. Gedas, W8BYA EN70JT Gallery at http://w8b