Hello Dan, >Providing the audio detection resistor and cap are removed from the vacuum >tube grid >or transistor base circuit to preserve the RF in the output, >needing the i.f. bandwidth >you mention. Yes the goal is to avoid electronic filtering. In the DSB receiver that I did, the bandpass filter "is done" first by the bandwidth of the Operational Amplifier and, moreover, by the antialiasing filter of the sound card (at about 23 KHz).
RR for your experimentations...I suppose that you mean QSD (normally "bad CW keying") circuit for "not very professional circuit"? RR for "AM Synchronous": normally it's just the fact to receive AM in USB or in LSB. In Multidem, AM is received as in the analogical way (by rectifying the signal). TKS for the info about CIAO. It is a splendid software. 73 Patrick ----- Original Message ----- From: [EMAIL PROTECTED] To: [email protected] Cc: [EMAIL PROTECTED] Sent: Saturday, August 26, 2006 9:47 PM Subject: Re: [soft_radio] MULTIDEM 1.0 (USB/LSB/AM demodulator for direct conversion receivers) Patrick This seems like something one can use with a simple regenerative receiver? Providing the audio detection resistor and cap are removed from the vacuum tube grid or transistor base circuit to preserve the RF in the output, needing the i.f. bandwidth you mention. In which case this might lead to folk making some interesting home gifts of the simple receiver sort to give to others along with a software such as yours. I have been experimenting with a digitally stablized VFO for use with 455 kHz i.f. sections and a simple QSD circuit. I'll do some experiments with your software as I go along here. It seems very interesting. My last VFO test circuit seems to hold some promise if given the right scheme in a receiver to work in. A sort of ideal mixing scheme for better stability. Its all beta circuits for now, and sometimes its hard, then you stumble upon something that opens it up. I am also building various QSD circuits to explore and test. Keep us posted on any software designs you come up with in the future! P.S. I found out the one can have software do "AM Synchronous" also as well as "C Quam AM", and this is in the CIAO Radio 1.35 software. AM Sychronous is something interesting for folk who like broadcast stations to listen to. {SDR is capable of allot of radio modes.} You can see this at the below link: note it only works in one mode since it is meant to be registered. I think it is USB, I am exploring a licensed version with all of the modes working. http://www.comsistel.com/Download/CiaoRadio/CIAO%20RADIO%20MULTIMODE%20RECEIVER%20-%20TEST%20SET_file/Upgrade%20CD%20Ciao%20Radio%20ENG%2008-08-2006.zip Dan ka9rza __________________________________________________________ PrivatePhone - FREE telephone number & voicemail. A number so private, you can make it public. http://www.privatephone.com [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
