|
Title: FM alignment w/sweep Post by: AB3FL on March 13, 2014, 08:48:20 PM How much signal should I use when doing an FM alignment with a sweep gen? In this case, it is a SX-62. Should the ALC kick in? Should I disconnect the ALC?
thanks Tom - AB3FL Title: Re: FM alignment w/sweep Post by: Pete, WA2CWA on March 13, 2014, 09:15:03 PM What ALC?? This is a receiver.
Title: Re: FM alignment w/sweep Post by: AB3FL on March 13, 2014, 09:41:01 PM Yes it is a receiver and I mean AVC/AGC not ALC
What ALC?? This is a receiver. Title: Re: FM alignment w/sweep Post by: N8ETQ on March 13, 2014, 11:51:43 PM Hey Tom, FM detectors are hard to overload, I would hit it with whatever amount gives you a good response on your scope. Even if your getting square waves out of the last IF the detector won't care. It's not supposed to respond to amplitude. GL /Dan Title: Re: FM alignment w/sweep Post by: Opcom on March 14, 2014, 12:06:27 AM FM usually has a signal strength meter but AGC is not really necessary. When you get into the limiters, usually a chain of IF stages each with lots of gain, having the one you are tuning driven so as not to be in the limiting mode lets you be more precise. But don't tune the chain so sharply you kill off the necessary bandwidth. That is more of an issue on entertainment FM receivers. Really each set is different. Does the manual have a procedure? AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
|