[Doug S]

I have a DTV Slimline AU9 dish. I know that the LNB voltage powers the LNB and determines polarity on the 101 LNB, the 22KHz signal turns on the 119 LNB, what activates the Ka LNBs or are they always on when other LNBs are powered? DiSEqC settings?

 

[evan_s]

Depends on which you are referring to. 99s and 99c once it comes up will be stacked with 101 on 13/18v with no tone. 103s and 103c are stacked with 110/119 on 13/18v with 22khz tone.

 

[Tom Robertson]

I think the LNBs are energized as they are selected in stacks. If all four inputs on a dish are either nothing or ~13V/no tone, then the 99/101 LNBs are energized. When tone is applied, the 103/110/119 LNBs would be. (Note, I'm guessing here, based upon what I think I've seen behaviorally.)

But once an external switch is applied, all LNBs are always engergized all the time. And think how rare it would be for an environment with more than one receiver to all be on the same stack of LNBs.

Cheers,
Tom

 

[hdtvfan0001]

Based on the thread heading, I was going to say a svelt spy satellite....but then I guess that doesn't really fit, huh...

 

[Tom Robertson]

Yeah, if you had actually said what you said you were thinking of saying, I might have to moderate it a bit...

 

[hdtvfan0001]

Yeah, if you had actually said what you said you were thinking of saying, I might have to moderate it a bit...

I figured as much....it's not like I'd throw caution to the wind or anything.. :lol:

Actually....it is an interesting question, once I understood the real intent.

 

[NYCEGUY01]

99 AND 103 Use a digital signal sent from the IRD

 

[Tom Robertson]

99 AND 103 Use a digital signal sent from the IRD

Nope, guess again.

Actually both Ka hi and Ka lo from 99 are sent on the same settings as 101. As are 103 Ka hi and Ka lo with 110/119. They use 3 different "stacks" of 500MHz bandwidth portions of the 250MHz to 2150MHz spectrum on the coax.

Cheers,
Tom

 

[PicaKing]

I always thought it was the Playboy channel that turned them on.....

 

[bobnielsen]

I suspect that all of the LNBs are ON whenever power is applied. The multiswitch will select which output/polarization is selected for each output port. IIRC, 99 is selected with the same logic as 101 and 103 uses the same logic as 110/119 (the frequencies are different so there is no interference between downconverted Ka and Ku signals).

 

[veryoldschool]

I suspect that all of the LNBs are ON whenever power is applied. The multiswitch will select which output/polarization is selected for each output port. IIRC, 99 is selected with the same logic as 101 and 103 uses the same logic as 110/119 (the frequencies are different so there is no interference between downconverted Ka and Ku signals).

13 volts odd tps 99 & 101
18 volts even tps 99 & 101
13 volts 22 KHz odd tps 103, & 119
18 volts 22 KHz even tps 103, 110, 119

 

[Jeremy W]

99 AND 103 Use a digital signal sent from the IRD

The only time digital signals are sent from the IRD is when it's used in an SWM configuration. And that's only to communicate with the SWM itself, the SWM still talks to the LNBs with the voltage/tone combo.

 

[Tom Robertson]

Jeremy W,

Now you get a Nope...Not quite right either.

The IRD sends DiSEqC signals for the flexports.

And technically the 22khz tone is a digital signal (on or off) for the 103/110/119 LNBs and part of DiSEqC too.

Cheers,
Tom

 

[cartrivision]

So then the next question is, what is the signal method that is used to tell the BBCs to start broadband converting?

 

[Tom Robertson]

So then the next question is, what is the signal method that is used to tell the BBCs to start broadband converting?

Good point. I think that is also a subset of DiSEqC, but I'm not 100% certain.

Cheers,
Tom

 

[K4SMX]

I'm not sure a BBC would need a "signal" other than the presence of the low frequency IF signal which needs up-converting....

 

[cartrivision]

I'm not sure a BBC would need a "signal" other than the presence of the low frequency IF signal which needs up-converting....

Since the BBC converts the KA low feed frequency range into a frequency range that is used for something else in the stack, the conversion does need to be turned on and off.

 

[Jeremy W]

And technically the 22khz tone is a digital signal (on or off) for the 103/110/119 LNBs and part of DiSEqC too.

Sigh, so technical! :lol:

The 22khz tone is the carrier for DiSEqC, but the way it's used for 103/110/119 in a continuous on or off manner isn't a DiSEqC command at all. Since we're being technical.

 

[P Smith]

So then the next question is, what is the signal method that is used to tell the BBCs to start broadband converting?

It's DiSEqC commands "E202" and "E203".

 

[texasbrit]

I'm not sure a BBC would need a "signal" other than the presence of the low frequency IF signal which needs up-converting....

No, the BBC control signal is another quasi- DiSeqC format signal, using the 22 Khz tone,