Olson Technology OTM-3000-HR - Manual (Page 6)

025-000258 REV B Page 6
MODULATOR SWITCH SETTING CALCULATION
The output frequency select switches may tune a unit in either 1MHz or 250KHz steps depending on the factory
presetting of step size. To calculate the switch settings for a unit, the formula is as follows:
N = OUTPUT FREQUENCY + 2ND IF FREQUENCY 2ND IF FREQUENCY
STEP SIZE IN MHz ALL NTSC = 612.75
ALL PAL = 605.75
OR FOR 1MHz STEP SIZE
N = OUTPUT FREQUENCY + 612.75
1
OR FOR .25MHz STEP SIZE
N = OUTPUT FREQUENCY + 612.75
0.25
Convert the number “N” to binary with the least significant bit on the left, (not the right as is customary). This binary
number represents the switch settings with 1 = UP, 0 = DOWN.
BINARY CONVERSION WITH LEAST BIT ON LEFT.
————————————————————————————————————————————
EXAMPLE: CALCULATE 437 IN BINARY
STEP 1) CONSULT CHART FOR LARGEST NUMBER LESS THAN OR EQUAL TO 437. (256)
STEP 2) CONSULT CHART TO FIND NEXT LARGEST NUMBER WHICH ADDED TO 256 IS
LESS THAN OR EQUAL TO 437. (128 + 256 = 384)
STEP 3) CONSULT CHART TO FIND NEXT LARGEST NUMBER WHICH ADDED TO 384 IS
LESS THAN OR EQUAL TO 437. (384 + 32 = 416)
STEP 4) CONSULT CHART TO FIND NEXT LARGEST NUMBER WHICH ADDED TO 416 IS
LESS THAN OR EQUAL TO 437. (416 + 16 = 432)
STEP 5) CONSULT CHART TO FIND NEXT LARGEST NUMBER WHICH ADDED TO 432 IS
LESS THAN OR EQUAL TO 437. (432 + 4 = 436)
STEP 6) CONSULT CHART TO FIND NEXT LARGEST NUMBER WHICH ADDED TO 436 IS
LESS THAN OR EQUAL TO 437. (436 + 1 = 437)
STEP 7) EACH NUMBER CHOSEN = CODE 1 AND EACH NUMBER NOT CHOSEN = CODE 0.
X X X X X X
1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192
437 = 1 0 1 0 1 1 0 1 1 0 0 0 0 0