First, dial down to the bottom end of the band, eg 50.001, on usb. Press the button on the left side of the dial so that the red light comes on. Keep on pressing this button with your right hand/finger. Now with your left hand change the mode from usb to fm and back, do this many times and you will see the freq going down in 10 increments.
You will notice that the freq read out will not show 49mhz but 59mhz, ignore this. I have listerned to cordless phones down at "59mhz". Take the freq read out down to 48.999mhz, "58.999mhz," only then can you use the dial to dial down after letting the button go. Anything between 48.999mhz"58.999mhz" to 49.999mhz "59.999mhz" will revert back to 53mhz if you let the button go and try to dial down. Between 48.999 to 49.999 you can ownly dial up.
I have listerned to video signals from Europe on 48.250mhz "58.250mz"
I hope you have luck with this.
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