gelbelt
join:2002-03-06
Atlanta, GA
| reply to gelbelt
Re: digital cable and splitting
Thanks for the reply. I'm really glad to know that the set top box has a diagnostic mode. I have an Explorer 3100. It reports -18 dBmV level and 23-27 dB SNR. That's for digital channel 101. The current FDC of 74 MHz has a level of -10 dBmV and approximately the same SNR. This is with a three-way splitter on the side of the house - one to the cable modem, one to the set top box, and one to the VCR.
Before I saw your note I carried the cable modem around and checked levels. It reported -17.4 dBmV on the outlets and -10 dBmV outside before the splitter. The SNR was in the 25-30 dB range.
Do you think I could get the cable company to do anything? The tech was rushed when he did the installation, and I didn't see if he checked levels. If he had -10 dBmV at the house and connected two outlets, with the splitter and cable loss the level at each outlet would be just above -15 dBmV.
Perhaps I should amplify the signal coming into the house since it is low to begin with. If I add 10 dB of gain, I'm up to 0 dBmV. From there I could do a three-way split, giving the cable modem and set top box around -5 dBmV each. Then if I split the last output of the three-way splitter, with a four-way splitter, I could have around -14 dBmV at each the VCR and three analog TV's.
Thanks again for your help,
Adam |
