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Designing Your Own Distribution System
An ideal video system will have equally balanced signal strengths at all termination points. The signal can’t be more than 15.5dBmV since this is the max allowable by the FCC. RG6 Cable loses 2-6dB per 100-foot sections. Passive Splitters and Combiners lose approximately 4-6dB at each 2-way splitter, approx 6-9dB at each 4-way splitter. Add up total loss and amplify so that signal at all destination points is at the same level. Make sure you balance all incoming signals so they enter the amplifier with the same signal strength. For example, if your cable signal is at 5dB and your Modulator Signals are at 15dB, insert a -10dB Attenuator Pad on your modulator line prior to combining with the cable signal for amplification. Be careful not to exceed the maximum output of your amplifier or excess noise will be introduced. The output level is calculated by adding the amplifier gain to the input signal level. On longer runs, use a Tilt Compensator to bring the higher frequency signals back into balance with the lower frequency signals. (High frequencies lose strength faster than low frequencies.)
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| TV/Cable Channel Frequency Chart | | Each channel occupies a bandwidth of about 6 MHz. The UHF Band begins where Hyperband ends. Therefore, you can receive cable channels above 64 by using a UHF modulator. | FM
VHF
Low-Mid Band CATV 95 - 99
Mid Band - CATV 14 - 22
Super band - CATV Ch. 23 - 36
Hyperband - CATV Ch. 37 - 64
UHF Ch.14 - 69 / CATV 65 - 140 | 88 - 108 MHz
54 - 211 MHz
90 - 115 MHz
121 - 169 MHz
216 - 295 MHz
300 - 463 MHz
468 - 890 MHz | |
| RG 6 Coax Cable | Frequency
Nom. MHz | Attenuation
db/100 ft.' | | 1 | .26 | | 10 | .76 | | 50 | 1.46 | | 100 | 2.05 | | 200 | 2.83 | | 400 | 4.05 | | 700 | 5.60 | | 900 | 6.23 | | 1000 | 6.59 | | 1200 | 7.50 |
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