Re: FW: [Elecraft] How to set up SSB
Hi Dan. Another idea. Why not some sort of RF-probe circuit? It would look just like the RF probe in the book, but with different component values to get the time constant down. The RF probe in the book gives about a 100 Hz bandwidth which isn't enough (I'd want at least 5K for SSB audio testing). This will only work for AM signals (full carrier, and at least one sideband), not suppressed carrier SSB. My guess is that even if you were to throw your balanced modulator WAY out of balance, it still would provide poor and confusing results due to the carrier attenuation provided by the crystal (sideband) filter. A simple, low gain, direct conversion receiver (oscillator, mixer, audio amplifier) will provide the necessary carrier injection (BFO) for proper audio demodulation. 73, de John, KD2BD = Visit John on the Web at: http://www.qsl.net/kd2bd/ __ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: FW: [Elecraft] How to set up SSB
Hey, I just figured that out. 20K and 0.01 detect fine at a decent bandwidth, but it's output is average envelope power. You are absolutely right that I'm detecting AM. It sort of sounds like a voice when I talk, but when I whistle, it's just a constant 3v out. Not gonna work without an oscillator. I must have known that because I said it wouldn't work for CW, but I just had to try. Thanks anyhow. Dan -Original Message- From: John Magliacane [mailto:[EMAIL PROTECTED] Sent: Friday, November 12, 2004 10:22 AM To: Dan Barker; Elecraft Subject: Re: FW: [Elecraft] How to set up SSB Hi Dan. Another idea. Why not some sort of RF-probe circuit? It would look just like the RF probe in the book, but with different component values to get the time constant down. The RF probe in the book gives about a 100 Hz bandwidth which isn't enough (I'd want at least 5K for SSB audio testing). This will only work for AM signals (full carrier, and at least one sideband), not suppressed carrier SSB. My guess is that even if you were to throw your balanced modulator WAY out of balance, it still would provide poor and confusing results due to the carrier attenuation provided by the crystal (sideband) filter. A simple, low gain, direct conversion receiver (oscillator, mixer, audio amplifier) will provide the necessary carrier injection (BFO) for proper audio demodulation. 73, de John, KD2BD = Visit John on the Web at: http://www.qsl.net/kd2bd/ __ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: FW: [Elecraft] How to set up SSB
On Fri, 12 Nov 2004, John Magliacane wrote: Hi Dan. A simple, low gain, direct conversion receiver (oscillator, mixer, audio amplifier) will provide the necessary carrier injection (BFO) for proper audio demodulation. You can likey throw together a pixie style rx in less than 20 minutes out of almost /any/ junkbox. If you want something more fun, a Small Wonder Labs Rock-Mite for $25 can't be beat :). ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
