Yes I know what you mean about wheels turning, I should not be doing this but it interests me so. I never learned how to use the spice software and some day I have to do it. Yes the Hi Z detector would be an advantage I would think but I have heard others say it makes the bandpass to narrow. Go figure! 73, and tnx fer all the info John
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Tonne Sent: Thursday, September 04, 2008 7:18 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] infinite impedance detector vs diode John: I am under the impression that the high input impedance of that AM demodulator is perhaps its most important point. The fact that it seems to buffer the output load from the detection action seems nice to me. I think it could be made temperature-stable rather easily by adding a diode in series with that 6200 ohm resistor from the base to ground. Then change the resistor. Base idles about .67 volts above ground so as to just barely turn on the transistor. Oh yes - the URL for those that may have missed it: http://tonnesoftware.com/appnotes/demodulator/diodedemod.html Yes, it would be possible to do the same kind of look-see on a product detector. All it takes is time! I have some other stuff that needs attention right now; wheels are squeaking. - Jim Tonne WB6BLD TonneSoftware.com ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
