Hello i live in the Durham, NC area and want to no what the active tone filter reeds are. This website states that the tone is 156.7 pl and they dont make a 156.7 active tone for the minitor 2 pages how can i find the frequency tones for this pager and area in which i live? also this is not for the frequency cryistals this is for the active tone filters reed thank you for your time ...............................