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125

Appendix B

RF Sanity Check

In order to address the situation where a receiver loses its authorization every 3 to 4 days, we

recommend that installers perform a spot check to verify that the COM2000 can successfully

tune to each of the satellite/transponder pairs where the DIRECTV program guide updates can be

found.

As a final check to confirm that correct RF signal levels are being received by the COM46 cards,

the following table summarizes “typical” SNR and AGC values that must be received to ensure

proper operation of the COM2000. It should be noted that this table is only valid for the

CONUS (Continental United States) feeds. The guide data for local channels is located

elsewhere on the 101 satellite.

Table 6 – RF Spot Check Values

DTV Channel

Sat network

Freq. Index

SNR

AGC

(dBm)

229

0 (101 sat)

≥10

-55 to -25

230

0 (101 sat)

≥10

-55 to -25

Note: These are the frequencies where DIRECTV Program Guide updates and CAPs are

received. Having signal problems here can cause channels to be missing from the program

guide, causing general system instability and resulting in authorizations being missed or

dropped after several days.

This value is effectively the power level at the input of the COM46 card.

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Technicolor COM2000 Betreibershandbuch Seite 125