Midland | 75822 Channel Mod

Modifying the Midland 75-822 can expand its standard 40-channel operation to 120 channels by adding extra bands

  1. Remove the battery pack and antenna.
  2. Remove the four screws on the back of the chassis.
  3. Carefully separate the front and back housing. You will see the main PCB (printed circuit board).
  4. Locate the PLL chip – a small (usually 16 or 18-pin) IC near the channel selector knob. Look for markings like "LC7137," "D8581," or "MC145106."

FUNC

The user typically holds a combination of buttons (such as and SC ) while powering on the device. A code or region selection appears on the LCD. midland 75822 channel mod

10.240 MHz

There is a less invasive mod for the 75822 that involves simply replacing the channel selector crystal. The stock crystal is usually or 10.250 MHz . Swapping it for a 10.695 MHz crystal shifts the entire range. However, this adds only 5 channels up and 5 down, not a full "band" mod. It requires no cutting, but is less popular because the benefit is minimal. Modifying the Midland 75-822 can expand its standard

PLL chip

To understand the mod, you must understand how your radio decides what frequency to transmit on. Every CB radio has a (Phase-Locked Loop). This chip takes a crystal reference frequency and multiplies/divides it to produce the needed transmit and receive frequencies. Remove the battery pack and antenna

Regulatory Compliance:

It is important to note that the Federal Communications Commission (FCC) and similar international bodies strictly regulate the frequencies and power levels allowed for Citizen Band (CB) radio. Operating on frequencies outside the standard 40-channel range or exceeding authorized power limits is illegal and can interfere with critical communications, including emergency and military services.

Q: Will the mod improve range?

A: No. Range is determined by antenna, line-of-sight, and transmit power (still 4W max). Mods reduce efficiency, so range decreases .