LF voltage

First off, your antenna may work well enough the way it is. Test it on a tag and see.

Ideally you want to bring those two voltage values close to each other, at the moment your antenna looks like it's tuned towards the higher frequency. Use the losweep, losamples and plot commands and note the numeric value under the peak. That gives you the antenna tuned frequency like so freq = 12M/(value+1)

Try removing a couple of turns from the coil and recheck the values, if the frequencies move toward each other, continue removing turns, otherwise you might have to add turns.

Alright, I'm just trying to get the hang of all of this as well, so please correct me if I'm wrong.

From what I gather, plugging the dt between zero and the time at the max value into the formula d18c7db gave us will give you the optimal frequency that your antenna is currently tuned to.  I'm not sure why your dt value is so wacky, but when i click on the peak (in the windows version) while trying to tune my antenna, it gives me about 92.  So 12,000,000/92 = 130434.78, which I believe is the Hz value of the peak.  This is a pretty decent balance between 125khz and 134khz.  If you're shooting for 125khz, you'd probably want  the spike to be at 96, and ~89.5 for 134khz.

If you want to increase the dt of the spike, add more wire.  Remove wire to decrease the dt.

-Ryan

Last edited by ryan (2009-06-26 16:04:39)

Yes, it works fine as it is but if there's something wrong with the client I'll try to fix it... I'll take a closer look in the next few days....

Thanks for the help!

Damn pup.py

I've tested and checked in your update to the Windows source, works fine.

I've also checked in an updated command.cpp -- it wasn't compiling in Windows. You may want to confirm my change is ok, it's line 706 in command.cpp in function CmdLoCommandRead:
-    strcpy(&c.d.asBytes + strlen(c.d.asBytes),dummy);
+    strcpy((char *)&c.d.asBytes + strlen((char *)c.d.asBytes), dummy);