Table 1—The data storage scheme is carefully designed in order to fit as much repeater information as is possible into the Z8F6401’s flash memory along with the program. By using only as many bits as is necessary for each parameter, it’s possible to have a database of more than 6,000 repeaters. (The total number of repeaters in the U.S. is approximately 8,000.)

Variable	Bits	Comments
Station latitude	11	Stored as grees relative to 24°N
Station longitude	12	Stored as grees relative to 60°W
Tone	6	Index into a look-up table with a capacity of 63 tones (51 are used)
Frequency	7	Stored as a 5-kHz increment relative to the frequency of the previous station
Offset direction (+ or –)	1
First letter of call	3	The first letter is always K, W, N, A, or V
Second letter	5	Stored as an offset from A
Digit of station call	4
Third, fourth, and fifth letters	15	Each letter is stored as an offset from A
Total	64	Stored as four 16-bit integers