Olson Technology LCM-750x3 - Manual (Page 3)

025-000392 REV D Page 3
1) INTRODUCTION
The Olson Technology LCM-750 X3 is a rack mounted chassis 1.75” high that contains 3 LCM-750
frequency agile FCC compatible video modulators. Each modulator provides +55 dBmV output from
48.25 MHz to 750.00 MHz. Channel mode or frequency mode of operation is selectable via a selector
switch accessible from the top plate. Channel modes include CATV, HRC, IRC and Broadcast. FCC
offsets of +12.5 KHz and +25 KHz are automatically provided depending on the channel plan selected.
The LCM-750 offers the unique Olson Technology feature of >75 dB out-of-band carrier to noise ratio
along with SAW filtering to provide professional level performance.
Standard composite video and audio or I.F. can be input to the unit.
2) CHANNEL SELECTION
The mode selector switch, SW4 located through the top cover of the LCM-750 allows selection of the
following modes of operation. The selector switch has 10 positions available. The mode switch is set to
position 3, EIA CATV STD, when unit is shipped.
0. CATV STD (GI ) NTSC
1. HRC ( GI ) NTSC
2. IRC ( GI ) NTSC
3. EIA CATV STD NTSC
4. EIA HRC NTSC
5. EIA IRC NTSC
6. BROADCAST NTSC
7. MHz +0 MHz
8. MHz +0.25 MHz
9. UNDEFINED
The front panel switches labeled 100’s, 10’s and 1’s will adjust the frequency as indicated in modes 7 and
8. In modes 0-6 the front panel switches adjust to indicate the channel selected. For instance, a 0 selected
for the 100’s and 10’s, with a 5 selected for the 1’s switch would select channel 5.
When a valid channel is selected, the green LED, located on the front panel will light indicating synthe
sizer lock. The RED LED will flash when an invalid channel is selected and solid when no lock has
occurred. A channel plan is provided at the end of this owners manual.