Broadcast Frequency & Channel Routines for dBase IV

Release 1.0
August 20, 1990
	
	Compiled dBase IV (Version 1.1) Routines
	
	Files: -- 	db4freq1.dbo (procedure file)
						freq.txt     (this file)
	
	To use (in dBase IV, Version 1.1, type "set procedure to db4freq1", then
	any of the following.
	
			Do chtofreq with channel
			Do FreqtoCh with freq			
			x = Freq(Channel)
			x = Channel(freq)
	
	to finish using the procedure file, type "set procedure to"
	
	Channel may be a string or number within the limits of Valid Channel Ranges,
		below.  Procedure results are deposited in numerical variable freq (in
		megahertz) or channel (string or integer, as appropriate), if the value input 
		corresponds to a valid broadcast frequency or channel. Included are all valid 
		AM, FM, UHH-TV, VHF-TV, MDS, MMDS, ITFS and OFS Video channels.
			If an invalid channel or frequency (under existing US-FCC rules) is passed,
			then the result is zero.
		For AM and FM channels, result is dial position (channel center). For all
		other bands, the result is the lower limit of the assigned channel.
		
Valid Channel Ranges							Valid Frequency Ranges
1,2a,2-36,38-69									.515-1.705, 54-72, 76-87.8,												
200-300,A1-A4,B1-B4								87.9-108.0, 174-222, 470-608,
C1-C4,D1-D4,E1-E4								614-890,2150-2162,2500-2686
F1-F4,G1-G4,H1-H3		

All Routines (and this file) Copyright 1990, by j.m.willkie-ruiz. all rights
reserved.  Holders of these files may posess, use and distribute to others
at no cost.  All other uses, possesions and dsitributions require prior 
writeen approval of copyright holder.

John Willkie
PO Box 33964
Washington DC 20033-0964
202-338-0441