![]() The Si570 is not marketed as a radio device although it's signal purity seems good enough to satisfy many. Read the information at enter Si570 in the search box. They actually all start at 3.5MHz, but this is not specified. The frequency is specified from 10MHz to 215MHz, (160MHz CMOS) some are specified to beyond 1GHz. The use of the Si570 was proposed as a way of giving the Softrock SDR more frequency agility. ![]() (Sections 6-9 on this page) Other methods are being developed. There are details of control using a printer port (LPT), Serial (COM) port, USB, PIC, PICAXE, two stand-alone controllers. 73 Guido PE1NNZ" Much of the control software uses smooth tuning in a limited frequency range but large changes inevitably produce substantial clicks. For steps larger than 3500ppm, the si570 can be re-tuned within about 10ms. This makes it possible to increase the frequency in steps with a fast rate. "With the help from a microcontroller, the si570 can be re-tuned within about 100�s as long the frequency change is within 3500ppm. This is not a real VFO but fast changes can be made via its I2C pins that will satisfy most users. The Si570 has a startup frequency specified at the time of ordering. Please take these notes and links as a guide, advances are being made continuously, some things I just don't understand! Sorry for any dead links, please let me know. June 2014 Dead, will put elsewhere.ĬONTENTS OF THIS PAGE Use keyboard "Ctrl-F" to search this page for a keyword. ![]() Nothing is required of you, just join and read what information others have provided. (Tony now supplies the Si570 with his kits.) In the unlikely event of you never having joined such a group, don't be afraid. Tom has distributed several? thousand Si570s to members of the group who would not have even heard of it. These can be amazing! People from all round the world share their particular expertise. The information is all there but difficult to find. Join the group, look through the Files section and pictures, a specific subject may be found by searching the messages. Many links on this page to Yahoo, unfortunately closed, most will be duplicated on groups.io. Please note that I am not updating this page very regularly it is more of an archive many links are dead.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |