Olson Technology MUSCLE-1000C - Manual (Page 5)

OPTICAL CONNECTORS AND CLEANING
INTERNAL CONTROLS
The standard optical connector is an SC/APC. In order to use FC/APC connectors, you
must order a conversion kit, OTLL-SCFCKIT. The standard optical connector location is
on the opposite side from the RF connector. The connector can be moved to the other
side by swapping it with a cover plate. Only a screwdriver is required for this operation.
The fiber ends can be damaged by the insertion of contaminated connectors. Some
types of customer damage to connectors are not covered under warranty. Fiber
connectors should never be left uncovered. Pre-packaged alcohol wipes are the most
convenient means of cleaning optical connectors. Clean alcohol and lint free wipes,
such as Kim-Wipe type 34155, or swabs may also be used.
There are no internal user adjustments. The only reason to open the unit would be to
move the fiber connector to the other end of the unit. This should be done before the unit
is attached to a rack mount kit. The unit should not be operated for long periods of time
without a top cover. This can cause RF radiation and ingress problems. The internal
cooling is also reduced when uncovered. Be sure to replace and tighten all top cover
screws. Oscillation or RF radiation can be caused by loose or missing screws. There is
no user adjustable internal laser power adjustment. Any change to the laser power will
result in poorer modulation characteristics and reduced link performance.
EXTERNAL CONTROLS AND TEST POINTS
There are two external DC test points. One reads laser current at 1V per 50mA. A typical
laser current of 30mA would read 0.6V at this test point. The laser power test point is
0.1V per mW. This is for historical tracking. The optical power meter is a much more
accurate means of measuring power. Both of these test points should be measured with
a high impedance voltmeter.
There is an external multi-turn RF input attenuation control on the front panel. This is set
at the factory to the fully clockwise position which yields minimum attenuation. The user
can add 4dB of attenuation with this control which allows the input RF level to be up to
4dB higher than the recommended levels. There is
an external 75Ω RF test point.
This test point measures the laser drive level, not the RF input level. This test point has
been adjusted to read a very specific level when the RF drive has been adjusted for
optimum optical modulation. For the factory tested input loading of 77 analog and 42
digital channels, this test point should read +10dBmV at 547.25MHz with the RF gain
control pot is fully clockwise. At this frequency, the loss in the connecting cable and any
also