Cable Tap Values Meaning

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Cable tap values meaning.

Directional couplers are placed at various locations throughout a distribution system based upon the required tap loss and signal level needed. Has catv broadband cable tv conventional and telephony taps and passives with frequency passing ranges from 550 mhz to 1 ghz with brands including antronix lindsay pct philips magnavox regal cisco scientific atlanta at 1 877 660 0974. Amazon s choice for coaxial cable tap. With a 15 dbmv signal at the tap digital cable can travel about 500 feet on a good rg6 cable.

These type of connection are commonly referred to as vampire connectors because they bite into another wire to suck pow. If this is the tap that is a flat out lie and i am no further than 450 feet. Typical values in dbmv are 6 9 12 16 20 24 27 and 30 and the insertion losses are higher for lower dbmv values. Get it as soon as fri sep 25.

This is true for both the downstream snr and the upstream snr which may be different values. If for example the signal level on a line is 28 dbm v a directional coupler having a tap loss of 28 db would be used to provide the signal of 0dbmv. The signal level at the out port called through loss varies depending on the value of the tap port. So now if at my tap i had levels of 14 on channel 4 and 17 on channel 36 and 21 on channel 70 i could pretty easily verify the integrity of the cable to any point measured.

Typically cable modems show the downstream snr the upsteram snr can only be calculated at the remote end of the coax usually at the node. A typical 26db tap through loss value is 3 to 1 2db ranging from 30mhz to 1000mhz whereas an 8db tap may have a through loss of 3 5 to 5db for the same frequency range. A value well over 40 may mean you have too much power. The lower the tap value the higher the through loss.

Just remember that higher snr means cleaner signal. If input signal strength equal 24 dbmv and desired signal strength at tap equal 0 dbmv a 24 dbmv dc would be used. Common tap loss values range from 3 db to 28 db.