Hello I tested IQ transmitter software with 74HC4052 modulator on 50MHz. My modulator work with DG8SAQ SSB IQ Generator well.
Short test result is here. I can get only SSB mode on center frequency. Shift frequency does not work. AM and FM functions seems no action. My OS is Windows2000 and Sis 7018 sound driver. Thank you for good software. I want to read this source code. best 73 JA7TDO Andy Talbot さんは書きました: > > > Peter Martinez G3PLX has written a small stand-alone piece of Windows / > PC software for a Software Defined Transmitter. The software > is intended to run as a companiom to the various SDR receivers out there > to give a transmit and receive capability. > > The program takes its input from a microphone and generates the I / Q > signals as a stero output pair for driving a quadrature image > cancelling upconverter. As well as Upper and Lower Sideband Peter has > included AM and FM modes, having developed a crafty technique involving > a subaudible tone to overcome the lack of DC response on PC > soundcards. A tone generator allows CW and testing; there is automatic > microphone gain adjustment and the ability to fine tune the phase and > amplitude balance between channels. The carrier frequency can be offset > from the centre by a few kHz if desired. The software can run on a > single soundcard for input and output, or it can make use of two > soundcards (freeing up the other half of each for other purposes). > > The software and a full description of the process can be found on my > website, at the URL given below. To kick-off hardware building, I have > included details of three I/Q upconverters developed over the > years. Two for HF use - a simple quickie design using NE612 chips, and > a high spec one with carrier/sideband balance for lab / testing > purposes. Also, one for 144MHz primarily aimed at driving the IF for > microwave transverters. There are a few ideas and pointers at other > routes, especially for microwave use. > > Many thanks to Peter for coming up with this software so quickly after I > mentioned it to him last week. He is still tweaking it slightly, so > modified versions may appear from time to time. It has been tested so > far with Windows XP, 2000 and NT, and works fine - we haven't tried any > other operating system. > > Andy G4JNT > > www.scrbg.org/g4jnt <http://www.scrbg.org/g4jnt> > www.scrbg.org/g4jnt/SDRTransmitters.htm > <http://www.scrbg.org/g4jnt/SDRTransmitters.htm> > >
