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Are you using current limiting resistors for the LED's on the output lines? The output voltage could be loaded down because to much current is trying to flow. Put a 1K resistor in series with the LED to limit the amount of current flow through the LED.
Maybe you can find the information you need here
Crystal Oscillator Basics and Crystal Selection for rfPIC™ and PICmicro® Devices
https://ww1.microchip.com/downloads/en/AppNotes/00826a.pdf
Re: How can I make a plastic cover for my homemade equipment
How to Make Your Own Prototypes : How to make your own Plastic Vacuum Former
https://www.instructables.com/id/How-to-Make-Your-Own-Prototypes-%3a-How-to-make-your/
Re: 0-ohm resistor
We use them at my work to switch in/out optional features on our products.
The optional circuit features would be populated on the board and the 0 ohm resistor that bypassed them would be removed.
how pm is closely relate to fm
Modulation: https://en.wikipedia.org/wiki/Modulation
AM - Amplitude modulation: https://en.wikipedia.org/wiki/Amplitude_modulation
FM - Frequency modulation: https://en.wikipedia.org/wiki/Frequency_modulation
PM - Phase modulation...
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