Isolate HR34 from MRV?

I'd think a band stop filter would do it.

Yes. Put a bandstop filter on the input to the HR34

dpeters11 said:

I'd think a band stop filter would do it.

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Davenlr said:

Yes. Put a bandstop filter on the input to the HR34

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BUT!!!!!!!
This doesn't disable the DECA in the HR34, so it could damage it.

Maybe the only safe solution is to have a CCK connected in passthrough mode and use the BSF on the SWiM side of the CCK.

This would at least give some attenuation to the reflection back to the internal DECA.

Enlighten please? How would a bandstop filter damage it?

"kevinturcotte" said:

I know this is the opposite of what most people want, but is there anyway to COMPLETELY isolate my HR34 from MRV? I've set it so the other receivers in the house can't see the HR34, but I don't want to see what's on the other receiver's playlist either. Anyway I can do that? I STILL want to be able to download On Demand stuff though.

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I believe the HR34 will allow you to set the Playlist to show Local only in playlist options.

Davenlr said:

Enlighten please? How would a bandstop filter damage it?

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High level signal ---> BSF [reflects] ---> into internal DECA at too high a level.

High level --- attenuation --- BSF [reflects] --- attenuation --- DECA [at lower level to keep from overloading/damaging]

OK, I wasnt aware the filter reflected. Thought it just blocked it. so if it was put on the splitter end of the coax that would be better? Or cant use it at all except going to the LNB?

Blurayfan said:

I believe the HR34 will allow you to set the Playlist to show Local only in playlist options.

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That works, but will it revert after a restart?

"kevinturcotte" said:

That works, but will it revert after a restart?

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Yes, it will revert after a restart.

kevinturcotte said:

That works, but will it revert after a restart?

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Blurayfan said:

Yes, it will revert after a restart.

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Don't want to speak for others, but "local only" should be a sticky setting, IMHO. If it's not, I'd report it as an "issue".

It will solve the OP's request nicely, because it will only show local recordings, but still give him access to On Demand content.

Steve said:

Don't want to speak for others, but "local only" should be a sticky setting, IMHO. If it's not, I'd report it as an "issue".

It will solve the OP's request nicely, because it will only show local recordings, but still give him access to On Demand content.

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My Playlists seem to stay in the position I leave them in for several days at a time. Or forever, never tried that.

Rich

veryoldschool said:

A DECA is much like a 1 milliwatt transmitter [and why they get warm].
A BSF is high impedance, so it rejects/reflects the signal.
Adding splitter(s) will attenuate, but it will also attenuate the SWiM signal too nono.
The CCK has a low loss pass through for the SWiM, while having about 10 dB for the DECA. [win-win]

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Is a BSF really that high impedence it's going to reflect the signal enough to damage the unit? I suppose it may reflect, but I doubt it will damage it.

Case Study:
Power up an HR34 with no coax connected. This will create the biggest reflection possible. I doubt it would cause any damage.

To really make this work, you would need to install a BSF, and then install ethernet onto the HR34 BUT the ethernet would have to be going to an isolated network that had access to the internet. You could do this with a managed switch or a router with multiple interfaces. This part is kind of beyond the scope of this forum.

extide said:

Is a BSF really that high impedence it's going to reflect the signal enough to damage the unit? I suppose it may reflect, but I doubt it will damage it.

Case Study:
Power up an HR34 with no coax connected. This will create the biggest reflection possible. I doubt it would cause any damage.

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The DECA signal HAS TO GO somewhere, right?
If the filter rejects it [which it does], then the signal is reflected back.
Your "case study" is a case where all of DECA signal reflects back to the DECA receiver. Question: how long before it overheats?

veryoldschool said:

The DECA signal HAS TO GO somewhere, right?
If the filter rejects it [which it does], then the signal is reflected back.
Your "case study" is a case where all of DECA signal reflects back to the DECA receiver. Question: how long before it overheats?

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I would be surprised if the DECA radio didnt have some sort of protection in it. Dont you think the bsf's use a resistor to dump the signal just creating a bit of heat inside the bsf itself? On the input side, you'd think if it was sending reflections back across an entire deca installation you would have some weird stuff going similar to multipath so it would have to act more like a 'terminator' on an old 10-base2/thin-net/coax network with t's and terminators.

veryoldschool said:

[*]The WCCK, which is made to connect straight to a DECA, has 10 dB attenuation, so the DECA receiver doesn't get the full power.

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One thing, those DECA boxes are supposed to be powered by the receiver right? I dont think an HR34 is going to supply power, so would that still function as an attenuator?

That's only half the battle though, as if you want to still connect the box to the internet you face the problems in my first post above.

Im one that is really interested in finding out your results. I find it to be a major design flaw if the DECA could be damaged by adding a passive bandstop filter to it.

Usually Directv is pretty good about designing their stuff to be pretty tolerant of incorrect hookups.

extide said:

I would be surprised if the DECA radio didnt have some sort of protection in it. Dont you think the bsf's use a resistor to dump the signal just creating a bit of heat inside the bsf itself? On the input side, you'd think if it was sending reflections back across an entire deca installation you would have some weird stuff going similar to multipath so it would have to act more like a 'terminator' on an old 10-base2/thin-net/coax network with t's and terminators.

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As I posted, I don't [yet] know the receiver specs.
The BSF can't have a resistor to "dump" the signal. That's not how they're made, since it also needs to pass the SAT/SWiM signals too.
DECA by its nature has signals "bouncing around" all through the coax and splitters, so there are many "multi-path" signals. The Phy Mesh rates come from the signal to noise ratio, and if your multi-path is off, so are is the Phy Mesh.