Hi, Stephan! Yes, it uses a Tayloe detector, and the preselector filters are all third order.
It's my understaniding that even the classic diode-ring mixers are really switching mixers, because the diodes in effect hard-limit the LO. In the frequency domain, using a Tayloe detector (or any switching mixer) sacrifices nothing as long as the sampling images are filtered out downstream. --- In [email protected], "Stephan Schaa" <sc...@...> wrote: > > Hello ni9n! > > I've a question about your receiver: Do you use a kind of Swichting Mixer, > sometimes called Tayloe Detector? Or ist it classic single or dual > conversion? It would be interesting if you would post some more information > about the bandpasses like which order they are. > > 73, Stephan > > > > > > _____ > > Von: [email protected] [mailto:[email protected]] Im > Auftrag von ni9n > Gesendet: Sonntag, 24. Januar 2010 02:12 > An: [email protected] > Betreff: [soft_radio] LD-1 Discussion on Garage-shoppe.com Blog > > > > > Thanks to those who have placed orders for or expressed interest in the LD-1 > software defined receiver, which I am now shipping. Two of the first lot of > five are still available (I will be assembling them in the morning, so they > don't show up as in stock yet) and I have just ordered parts for the second > lot. Those should be ready to ship later in the week. > > To recap the LD-1's features (which are fully described at > www.lazydogengineering.com/LD1home.htm ) it is a soundcard-based SDR like > the Softrock-40 and similar SDR's, but with a dual-DDS local oscillator > using two Analog Devices AD9834 DDS chips. It will cover the entire 530 kHz > to 30+ MHz range. On the low end it will probably work below 530 kHz, but I > haven't tested it there. It may go as high as 37 MHz, but I haven't tried > that, eiter. It is USB controlled, either from Winrad or from its own > stand-alone application. While I haven't done any formal performance > measurements, it seems very comparable to my FT-817. Except, of course, > being an SDR it runs rings around any conventional receiver when it comes to > operator convenience and agility. > > I don't want to distract from the main topic of this discussion group, so I > would like to encourage anyone who is interested in the LD-1, or DIY > surface-mount projects, small-scale product developement, ham radio > entrepreneurship, etc. to visit my blog at www.garage-shoppe.com. > > > > > > Eingehende eMail ist virenfrei. > Von AVG überprüft - www.avg.de > Version: 9.0.730 / Virendatenbank: 271.1.1/2639 - Ausgabedatum: 01/23/10 > 20:33:00 >
