Installation

19. What can I do to increase the signal quality (signal-to-noise ratio) to the modem as measured by Mission Control?

If the Model 360 satellite modem is indicating low signal quality (<4.5db), follow the steps below, which may increase the signal quality (signal-to-noise ratio or s/n) by 1-1.5db. These steps detail how to remove the thin, white plastic cover on the LNB and removing the external Transmit Reject Filter (TRF) from the OMT/feed assembly. Caution: Removing the Transmit Reject Filter (TRF) is only applicable to LNB Model Number NJR2544HWN.

Additionally, if the steps outlined below do not increase the s/n above the minimum 4.5, installing a line amplifier on the receive IFL coax cable (RF In) may increase the signal strength to the modem. Also, check the Noise Figure (NF) on the linear LNB. If the NF is greater than .8 (point eight), you may want to consider replacing the LNB with one which has a NF less than .7 (point seven).

For LNB Model Number NJR2544HWN:

Check the LNB for the following model number: NJR2544HWN. If another LNB model number is used proceed to the instructions for site with LNBs other than NJR2544HWN.

Step 1:
If using the NJR2544HWN LNB, remove the LNB and external Transmit Reject Filter (TRF) which the LNB bolts to. (See Figure A). This requires loosening eight screws.

Step 2:
Look for the presence of a white circular sticker covering the opening of the LNB waveguide (end which was fastened to the TRF). If present carefully remove this sticker and try to remove any residual glue that may have been used to secure it. Be sure no foreign objects fall into the LNB waveguide cavity.

Step 3:
Reattach the LNB to the OMT assembly, taking care to insure the rubber O-ring stays in place. (See Figure B). Re-check the Signal Strength reading. If the reading is acceptable, proceed with the rest of the installation. Please leave the TRF with the customer, and advise the customer to keep this in a safe place in case the LNB is ever replaced with a model other than the NJR2544HWN. Do not perform the above procedure on any LNB other than the NJR2544HWN.

For LNB Model Numbers Other Than NJR2544HWN:

If an LNB model number other than NJR2544HWN is used follow the below procedure. If the site uses an LNB with model number NJR2544HWN see the preceding procedure.

Step 1:
Remove the LNB from the antenna.

Step 2:
Look for the presence of a white circular sticker covering the opening of the LNB waveguide cavity (this is at the end that was fastened to the antenna with four screws). If present carefully remove this sticker and try to remove any residual glue that may have been used to secure it. Be sure no foreign objects fall into the waveguide cavity. Step 3: Reattach the LNB to the OMT assembly, taking care to insure the rubber O-ring stays in place. Re-check the Signal Strength reading. If the reading is acceptable, proceed with the rest of the installation.