I will try to make this simple. The DTV HD signal runs from 250 Mhz to 2150 Mhz.
A diplexer divides the frequency into two parts: low and high.
The low side of the diplexer (ANT or TV) is designed to transmit between 5 Mhz and 900 Mhz.
The high side of the diplexer (SAT) is designed to transmit between 950 Mhz and above.
When you put a diplexer in the line between a DTV HD dish and multiswitch or receiver, you are cutting out all of the lower frequencies (250-900Mhz). BTW, this is where DTV is transmitting its signal for the 99 and the 103, which are the HD satellites. Basically, you are killing the HD signal between the dish and the receiver.
Technically, if you install a BBC between the dish and the diplexer, you could pass the signal to the receiver. BUT if I ever came across that on any job, I'd rip it out, and tell the cust to call the lazy idiot that installed thier HSI to come out and run them a damn line. A BBC, as stated previously, is not designed to be an exterior component, and alot of diplexers are outside at the d-mark.
FYI-You can diplex Dish Net HD and HSI without any problems. Dish still uses only the higher frequencies (950 Mhz and up). You just have to make sure that your diplexer starts at 5 Mhz.
Why DTV HD and HSI can't be diplexed
Member #: 43928
Registered: 1/26/2006
Posted:
476
Name:
yo
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Me and my tools
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Technician
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here and there
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Experience:
~24 years
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