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- From: randy_ware%nwmail@sparc.ncpa.olemiss.edu (Randy Ware)
- [1] A Pro 2021 Mod
- Date: Sat Aug 28 15:08:07 EDT 1993
- Organization: NCPA/University of Mississippi
- Lines: 23
-
- This is a speed-up mod for the slow 2021 that does work. It will increase
- the scan speed to about 11 channels per second. It has no effects on the
- delay time.
-
- Unplug the radio, remove the 9volt batt.
-
- Remove the upper case, by removing the four screws on both sides of the
- outer case, as well as the one screw on the rear apron of the radio which
- fastens the upper case to this surface.
-
- Lift the top case section and unplug the white plastic two conductor
- speaker plug, allowing removal of the upper case entirely.
-
- With the scanner sitting upright and facing you, locate resistor R-147 (a
- 39k-ohm resistor to the left-front of the main board-almost behind the
- vicinity of the LCD display). Snip the leads at the resistor body with a
- pair of wirecutters to leave as much of the existing leads as possible.
-
- Solder a 15K-ohm resistor to those remaining leads.
-
- I found this mod in Monitoring times and have done it to several Pro 2021
- scanners and have seen no negative drawbacks to it.
-