What a mu-tuning preselector is, and what it is not скачать в хорошем качестве

What a mu-tuning preselector is, and what it is not

This video explains what a *mu-tuning preselector is, and what it is not. Clarification: I mention in the video that the mu-tuner isn’t designed to stop QRM from 3KHz away. I want to clarify that statement. QRM from 3KHz away would usually mean that the other station is splattering. However, during contests, you could have QRM 2KHz, or even less, above or below where you are tuned. In fact, contesters these days will move in as close as 0.5KHz away from where you might be having a QSO. The *mu-tuning preselector cannot eliminate such QRM, but, if you watch my previous videos about dealing with QRM, you will see how the *mu-tuning preselector is another weapon in the arsenal that can help. These “variable preselectors” are high-Q factor (+300) filters that are inserted into the receiver signal chain between the attenuation stage and the bandpass filter stage. They narrow down the amount of RF spectrum allowed to continue to the bandpass filter stage to a mere few dozen kHz, by motor-driving a large 1.1” (28 mm) ferrite core stack through a 2” high (50 mm) coil structure. I hope you find this video informative and helpful. If you would like to help with the cost of this channel, please consider becoming a Patreon by visiting:   / n4hnh   73, de N4HNH