copied from the Internet:
Newsgroups: rec.radio.shortwave
From: parnass@cbnewse.cb.att.com (Bob Parnass, AJ9S)
Subject: Trick the old Bearcat BC-220 to search 136-144 MHz
x
                   Trick the Bearcat BC220 to
                      Search 136 - 144 MHz

     Here's a trick for altering the frequency limits of the
     early  version  of  the BC220, which appears in Grove's
     "The Best of 1982 Monitoring Times".

     I no longer have my BC220 and haven't tried this trick.

     To search 136 - 144 MHz:

       1.  turn the set off and on to clear the memory
       2.  manually select any channel
       3.  enter 136.0 MHz
       4.  enter 144.0 and press LIMIT
       5.  press SEARCH (reads ERROR)
       6.  press LIMIT (reads 136.0 MHz)
       7.  press SEARCH

     You may restrict  this  out  of  band  search  sequence
     further  once  steps  1  through  7 have been executed.
     While the receiver is searching, open  the  squelch  at
     whatever  frequency  you  would  like  to select as the
     upper search limit; then:

       a.  press 136.0 LIMIT
       b.  press SEARCH (reads ERROR)
       c.  press LIMIT (reads the  frequency  at  which  you
           stopped searching)
       d.  press SEARCH and close squelch  again  to  resume
           searching

     A number of frequency ranges may be substituted for the
     example  above,  but  only in the early versions of the
     BC220 with the older microprocessors.
-- 
============================================================================
Bob Parnass, AJ9S - AT&T Bell Laboratories
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Note: I haven't tried or verified this, proceed at your own risk.  WA2ISE
/EX