Olson Technology OTM-3000-HR - Manual (Page 2)

025-000258 REV B Page 2
OTM-3000-HR
FREQUENCY AGILE - HIGH RESOLUTION
TELEVISION MODULATOR
1) INTRODUCTION
The OTM-3000 HR is a frequency agile F.C.C. compatible television modulator that provides the ability of
channel selection from 41.25MHz through 445.25MHz in lMHz increments. All channels are selectable by
front panel DIP switches, including F.C.C. offsets of +12.5KHz and +25KHz.
The OTM-3000 HR high resolution modulator used with companion OTD-2000 HR high resolution demodu-
lator provides video bandwidth to 9.5MHz with carrier spacing as close as 12MHz. No audio capability is
provided.
The OTM-3000 HR offers excellent input sensitivity and high output level, typically +60dBmV. Also, this unit
has very high out-of-band carrier to noise ratio (>80dB) which allows virtually an unlimited number of
modulators to be combined without the need for external bandpass filters. The OTM-3000 HR has low
power consumption (14 watts @ 115 VAC) for reliable long term operation.
2) FREQUENCY SELECTION
Frequency selection is made by properly setting the two 8-position switches to the corresponding code.
Select the desired frequency code from Table #1 or the code card supplied with the unit, then set the DIP
switches from left to right.
The code card list standard TV channels. If these are used, select non-adjacent channels for spacings no
closer than 12MHz.
Table #1 is a listing that shows the binary code for all tunable frequencies from 41.25MHz to 445.25MHz in
1MHz steps. Set each DIP switch as indicated.
3) F.C.C. OFFSET SELECTION
Each channel listed on the code card has an “OFFSET CODE” number in either the left or right hand column.
“OFFSET CODE” #1 corresponds to 0KHz offset, Code #2 is 12.5KHz, and Code #3 corresponds to
+25KHz offset.
To select the desired offset, simply set properly the 4-position DIP switches to the corresponding offset
code as shown in Figure #1.