Section 5. Programming
5-5
Station ID Characters
The Model 15P is capable of transmitting the station call sign in Morse code at 22 Words Per
Minute. The encoder will do this approximately every 15 minutes during normal, regular
usage. The modifier “approximately” is used because the encoder does not key up to make
the ID just because the ID timer has run out. The encoder checks the ID timer every time it is
told to make a page, and if the timer has expired, the encoder transmits the station ID before
transmitting the page. This means that the real period between ID transmissions will be
affected to some extent by the amount of paging being done. The interval timer and the code
transmission speed are fixed at 15 minutes and 22 WPM.
The Model 15P will accept call signs up to ten characters in length. The call sign can use all
26 letters of the alphabet and the digits “0” to “9”. Because all of the programming of the
Model 15P must be entered from the rather limited keypad, it is necessary to use two-digit
combinations to represent all of the characters in the ID call sign. These two-digit
combinations are shown in Table 5.
PROGRAMMING-3
, and are based on the typical
number-letter assignments used on telephone keypads.
The first digit of each pair indicates the position that the letter has on its key, and the second
digit is the number of the key on which that letter is found. For example, the letter “N” is the
second letter on key six, so its two-digit code is “26”. All numeric characters are entered
simply by adding a leading zero to them, i.e. the number eight would be entered “08”. There
are two letters that do not appear normally on telephone keypads; the letters Q and Z. These
were assigned the combinations 11 and 21, respectively.
Table 5. PROGRAMMING-3 Station ID Cross-Reference
Digits
#
Code
Digits
Letter
Code
Digits
Letter
Code
00
0
12
A
x
26
N
x
01
1
x
22
B
x x x
36
O
02
2
x x
32
C
x x
17
P
x x
03
3
x x x
13
D
x x
11
Q
x
04
4
x x x x
23
E
x
27
R
x x
05
5
x x x x x
33
F
x x x
37
S
x x x
06
6
x x x x
14
G
x
18
T
07
7
x x x
24
H
x x x x
28
U
x x
08
8
x x
34
I
x x
38
V
x x x
09
9
x
15
J
x
19
W
x
25
K
x
29
X
x x
30
/
x x x
35
L
x x x
39
Y
x
16
M
21
Z
x x
