Olson Technology OTM-3550 - Manual (Page 3)

025-000136 REV J Page 3
OTM-3550
FREQUENCY AGILE - F.C.C. COMPATIBLE
TELEVISION MODULATOR
1) INTRODUCTION
The Olson Technology OTM-3550 is a frequency agile F.C.C. compatible television modulator that will
provide high level output, on any channel from 55.25MHz, Ch. 2 through 547.25MHz, Ch. 78. All
channels are selectable in 1MHz increments by front panel DIP switches. F.C.C. offsets of +12.5KHz
and +25KHz are also selectable by front panel DIP switches.
The OTM-3550 uses SAW filtering for excellent adjacent channel performance. This unit also offers the
unique Olson Technology feature of >77dB out-of-band carrier to noise ratio which allows virtually
unlimited numbers of the OTM-3550 to be combined without the need for external band pass filters.
The OTM-3550 is BTSC stereo compatible.
2) CHANNEL SELECTION
Remove the front panel plate marked “Output Channel Select” to expose the channel select and offset
select DIP switches as shown in Figure #1.
Figure #1
FRONT PANEL DIP SWITCHES
CHANNEL SELECT OFFSET
0 = Switch in DOWN Position
1 = Switch in UP Position
1) Select the desired channel by use of the channel select switch and the code sheets.
2) Select the proper offset by use of the offset switch and the offset information on the next page.
3) The example above indicates channel 6 with 0KHz offset.
OFFSET SELECT INFORMATION
1) Channels 14 (A), 15 (B), 16 (C), 25 to 41 (L to EE) & 43 to 53 (GG to QQ) = 12.5KHz.
2) Channels 98 (A-2), 99 (A-1) & 42 (FF) = 25KHz.
3) All others = 0KHz.
Offset (3) Rightmost DIP Switches
0KHz 0 1 1
12.5KHz 1 0 1
25.0KHz 1 1 0
0 0 0 1 1 1 0 1 0 1 0 0 0 0 1 1