Hello, I built an FM receiver for NOAA Weather Radio awhile back. It works pretty well but there's an annoying howl out of the speaker when I turn up the...

I recently constructed a PLL synthesized weather band receiver. When I apply heat using a hair drier, the reference oscillator crystal remains on frequency. The VCO LO only remains on...

Hi Folks, I recently built a voltage controlled oscillator (VCO). I will be using the VCO as an RF modulator to inject a 1.050 KHz tone into a weather band...