Actually the AGC is generated by the DSP in software. The signal VIFGAIN1 coming from a D to A converter (AD5302A) if fed back to the IF amplifier to control the receiver's gain. After the DSP filter reduces the bandwidth, the AGC is adjusted by the DSP. It's all done using mathematical calculations.
You can have a situation where the DSP filter is narrower then the roofing filter but if the DSP engineer does his job, the unwanted signal will be outside the DSP filter bandwidth. The third order products will be at a minimum and the AGC will not be affected. ----- Jack WA9FVP Willco Electronics -- View this message in context: http://elecraft.365791.n2.nabble.com/K-3-Roofing-filter-comment-tp6576237p6585872.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
