Giantkiller moves forward into Full Heterodyning.

Feynman · April 06, 2008, 04:11:57 PM

Okay, I've been rather sick for a day or two. I was very lucky to have access to powerful antivirals.

Not surprising to see that poynt has not left his armchair. Don't waste your time with people like this, they are here to slow us down.

giantkiller · April 06, 2008, 09:59:59 PM

I have new cave set up.
Connected GK4 and Notched PVC coil to LT6904 osc thru DC726a usb. Segments of GK4 resonates at 31MGhz. Driver is a TIP41. These really arent the best so i will switch over to the IR840 FETS using the ECD fet driver. I just pulled working stages out of boxes and threw it together on the bench.
I will load Feynman's ATmel code to my Diecimila flash board. Travelling down multiple paths.
@Feynman,
Tnx for the Oscs. Now I can push into the higher freqs.

Now for the bad news. I have 60hz hum real bad. I have to ground all unused segments to test 1. These coils are tremendous TX and RC antennas. Tank circuits do me no good in this setup.

Looks like the posting storm has passed.

--giantkiller.

Mannix · April 07, 2008, 02:25:35 AM

GK,

Yep.. the trolls have gone, for now.

When your gk4 baby gives you the"eebie jeebies" again it might be interesting to get hold of a small geiger counter and take a few measurements.

aleks · April 07, 2008, 04:11:49 AM

BTW, one of the "truths" behind coils is that in the presence of EM fields they are actually behaving like mechanical resonators, because their wires are "slapping" each other constantly when EM fields and current fluctuates. This fact should not be dismissed as it can be also important. (well, I know that in pro audio "transformer sound" is a desired artifact that makes a rich sound - it's not only about magnetic core saturation, but also about various "noises").

giantkiller · April 07, 2008, 10:42:00 AM

@Mannix,
http://www.vellemanusa.com/us/enu/product/view/?id=350509

Quote from: aleks on April 07, 2008, 04:11:49 AM
BTW, one of the "truths" behind coils is that in the presence of EM fields they are actually behaving like mechanical resonators, because their wires are "slapping" each other constantly when EM fields and current fluctuates. This fact should not be dismissed as it can be also important. (well, I know that in pro audio "transformer sound" is a desired artifact that makes a rich sound - it's not only about magnetic core saturation, but also about various "noises").

I put buzzmags inside along the coil edge to magnify the sound. The tweeting and chattering were quite prominent.

--giantkiller.