Olson Technology OTD-3000-BG - Manual (Page 3)

025-000388 REV B Page 3
D) The 5.5MHz aural subcarrier is available at the 5.5MHz output F-fitting. This output is typically
>+35dbmV.
E) Composite video (video with the 5.5MHz subcarrier present) is available at the video output
F-fittings if the rear panel composite switch is turned on. Leave this switch off if the 5.5MHz subcarrier
is not required on the video output.
5) CHANNEL SELECTION
Remove the small cover plate on the front panel under “CHANNEL SELECT” to expose the two 8-position
DIP switches. Channel or frequency selection is accomplished by properly setting the eight positions on each
of these two switches.
A) STANDARD CHANNELS:
Look up the switch codes for the channel you want to demodulate on pages 7 and 8 in this manual. A
“0” indicates a switch position as down and a “1” indicates a switch position as up. Using the codes
shown for the channel you require, set the DIP switches according to the chart from left to right.
B) NON-STANDARD CHANNELS:
Switch codes for frequencies not listed may be computed using the information on pages 4, 5 and
6.
6) AFC OPERATION
The OTD-3000-B/G has an AFC circuit which will hold the unit tuned to a selected channel should the source
channel drift in frequency. This feature is usually not required but may be activated by moving the 8’th position
of the right switch to down (on).
7) SELECTION OF NON-LISTED FREQUENCIES
Video carrier frequencies between 48.25 and 855.25 in .25MHz steps may be selected by following the
procedure below.
The 16 positions of the two DIP switches behind the “CHANNEL SELECT” cover plate have specific
functions as shown in Figure 1 and noted below.
SW 2 is a 6 position DIP switch on the PC board just behind and left of the front panel DIP switches.
Remove top cover for access. Figure 1 shows SW 2 set for frequency ending in .25MHz. The chart shows
settings for other frequencies.