Model 2809
CATV
Linx
®
LDS CATV Receiver
Operating Instructions
Revision 1.0
13
3) The RF input spectrum may not be flat. It is possible to have a green RF Level
LED even if the input spectrum has a large amount of tilt. All Force CATV
products are designed to operate with a flat input spectrum.
4) There may extraneous (i.e., non-video) signals in the input RF. Be sure to filter
out all non-desirable signals.
5) The optical input power at the receiver may be too low. Assuming that the
receiver shows a yellow light, the optical input level may be too low. See Fig-
ure 1.4 for the expected CNR versus the channel loading and received optical
power.
3.5
Cleaning
If the units need to be cleaned, avoid the use of all solvents and use low-pressure
clean air to remove loose dirt. Use low-pressure clean air to clear the connectors
of any debris. Dirty or scratched connector end faces will greatly reduce the unit’s
performance. Foam-tipped swabs such as the 2.5mm Mini Foam Swab offered by
Fiber Instrument Sales (P/N F1-0005) may be saturated with denatured alcohol*
and inserted into the optical port for cleaning. DO NOT INSERT A DRY SWAB
INTO THE OPTICAL PORT AS THIS MAY DAMAGE THE FIBER END FACE. Many
fiber optic installations experience degraded performance due to dirty optical con-
nector end faces. The following procedure should be used to properly clean the
optical connector end faces.
3.5.1
Connector Cleaning
Required Cleaning Equipment:
• Kimwipes
®
or any lens-grade, lint-free tissue. The type sold for eyeglasses work
quite well.
• Denatured Alcohol.
• 30X Microscope.
• Canned Dry Air.
Directions for Cleaning:
1) Fold the tissue twice so it is four layers thick.
2) Saturate the tissue with alcohol.
3) First clean the sides of the connector ferrule. Place the connector ferrule in
the tissue, and apply pressure to the sides of the ferrule. Rotate the ferrule sev-
eral times to remove all contamination from the ferrule sides.
4) Now move to a clean part of the tissue. Be sure it is still saturated with alcohol,
and it is still four layers thick. Put the tissue against the end of the connector
ferrule. Put your fingernail against the tissue so that it is directly over the fer-
rule. Now scrape the end of the connector until it squeaks. It will sound like a
crystal glass that has been rubbed when it is wet.
5) Use the microscope to verify the quality of the cleaning. If it isn’t completely
clean repeat the steps with a clean tissue.
6) Mate the connector immediately! Don’t let the connector lie around and col-
lect dust before mating.
7) Air can be used to remove lint or loose dust from the port of a transmitter or
receiver to be mated with the connector. Never insert any liquid into the
ports.
NOTE
Use only industrial grade 99% pure isopropyl alcohol. Commercially available isopropyl
alcohol is for medicinal use and is diluted with water and a light mineral oil. Industrial
grade isopropyl alcohol should be used exclusively.
