where:
TRANSMIITER
PROGRAMMING
Diode positioning
for transmitter channels can be calculated using the following formula:
N
=
(TX
X
.5 - ftx
X
2)
X
400
N
diode programming
position
TX
=
transmit frequency (MHz)
ftx
=
ranging crystal frequency (per chart 4.2 above)
Exarnple: Desired transmit frequency
=
155.00 MHz
N
(TX
X
.5 - ftx
X
2)
X
400
(155.00
X
.5 - 35.10
X
2)
X
400
(77.5 - 70.2) X 400
(7.3) X 400
2920
This resultant four digit number is then subjected to one of the following charts:
Chart
1
Chart 2
3000
>
N
>
2900
3999
>
N
>
3000
B3
2000
B3
2000
A3
.1000
D2
800
D2
800
C2
400
C2
400
B2
200
B2
200
A2
100
A2
100
D1
80
D1
80
C1
40
C1
40
B1
20
B1
20
A1
10
A1
10
DO
8
DO
8
CO
4
CO
4
BO
2
BO
2
AO
1
AO
1
Locations B3 - AO refer to diode locations on the diode matrix board. By installing the proper diodes.
according to the calculated number, the synthesizer provides the proper divide ratio, allowing the VCü to
operate on the proper frequency.
Example: Calculated number for N
=
2920
The binary equivalent for 2920 is determined as follows:
B3 - A3
2
D2 - A2
9
D1 - A 1
2
DO - AO
O
Diode programming
would then the n be determined as:
(B3)
(D2, A2)
(B1 )
6
Installation of the above diodes will program the transmit frequency of 155.00 MHz.
