Hello Jose, >Is it specific/exclusive to the AF band of direct conversion modules? No if you have some AF band between 0 to 20 KHz, the demodulator can isolate any transmission. In a DSB RX (direct conversion receiver) the bandwidth can be equal to +/- 20 KHz (so 40 KHz at the total) because the negative side is folded in the positive side and in this type of receiver you may have, as my DSB RX, a simple quartz to pilot the RX frequency. In that case, this program permits to explore +/-20 KHz around the quartz frequency (7.00 to 7.04 MHz, for example). And if in the future, we have 196 samples/sec sound cards, it will be +/- 98 KHz (7.0 to 7.2 MHz, for example), without any VFO.
>What about the AF band of other receivers (heterodyne?) In general in an heterodyne RX, the 455 KHz (for example) final intermediate frequency is filtered at about 3 ou 4 KHz. In that case, the MultiDem program is useless. 73 Patrick ----- Original Message ----- From: [EMAIL PROTECTED] To: [email protected] Sent: Friday, August 25, 2006 11:50 PM Subject: Re: [soft_radio] MULTIDEM 1.0 (USB/LSB/AM demodulator for direct conversion receivers) Hello, Patrick Great news***** Congratulations and thanks for sharing your developments ;-)) Is it specific/exclusive to the AF band of direct conversion modules? What about the AF band of other receivers (heterodyne?) 73 de Jose' Silva CT1AXG ----------------------------------------- Citando Patrick Lindecker <[EMAIL PROTECTED]>: Hello to all, Only for information (as it not really related to Sdr but to direct direct conversion receivers). The first release of MULTIDEM (1.0) is in my Web site (http://f6cte.free.fr). MULTIDEM 1.0 is a USB/LSB/AM demodulator for direct conversion receivers available from my WEB site. This program ("freeware") permits to: - extract any USB, LSB or AM transmission present in the AF band of a direct conversion receiver, up to 20 Khz, - to band-pass filter the received signal, - afterwards, to forward it to amplified loudspeakers and to MULTIPSK 4.1 (for decoding) through a TCP/IP link. Note: Multipsk is a digital multimode decoder. 73 Patrick [Non-text portions of this message have been removed] __________________________________________________________ Para grandes mails, grandes contas Portugalmail: 2 000 MB de espaço http://www.portugalmail.pt/2000mb [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/
