trying to understand how the signals from a HD/SD/DVR gets spread around

[woodeye3]

Hey bobukcat.
Hope this is where you wanted me to post this. Tuner 2 SD is diplexed back on the incoming coax and to sd TV. Does the incoming signal from the dish come into the house into a splitter backwards, out of the normal in of the splitter to the dual tuner, back (diplexed) on the coax to the splitter, out the on the unused out on the splitter, to a TV. Tuner 2 only sends out a SD sig. If I want to dvr a HD show I use the DVR button on the HD remote. If i want todvr a show on tuner 2 I use the dvr button on the sd remote. If I want to watch a HD show from the DVR I access it through the HD remote and view it on the HD tv. Similar for sd tuner/dvr. Can I watch a DVRed HD show on a sd TV. It would be in SD not HD yes? Does the DVR signal to the SD TV get there via diplex on coax like the tuner 2 TV signal. I won't even attempt modulating but if the above is correct or close That will be next.
Thanks Jeff

[BattleZone]

You have it right. The TV2 output is an RF-modulated standard-def signal, so any time you are watching an HD channel, or watching an HD recording, on the TV2, the DVR is down-converting the HD content to SD before feeding it to the TV2 output.

There is no reasonable way to distribute HDTV via coax (due to encryption requirements), and no reasonable way for Dish to offer to connect remote TVs via component or HDMI cables (which would usually have to be very long and expensive, and potentially require a lot more installation work in order to make the customer happy), so TV2 outputs are limited to SD only. If you need HD at a TV, it needs its own HD receiver.

[bobukcat]

If you only have one piece of COAX to the receiver you will have to use diplexers to send your TV distribution (it can send both TV1 and TV2 out on different channels if you enable it to) from the 722 out to other TVs. I wouldn't count on installers having these diplexers (if you do a search on Diplexers you will find a bunch of posts describing them, what brands are good, where to get them) if you need them but you might get lucky. If you have two pieces of coax just use one as your TV distribution from both 722s to the SD TVs.

The SAT signal will come in on one wire and then uses a DPP Splitter to supply both SAT inputs, these will be supplied but are not standard UHF/VHF splitters.

As for recording in SD versus HD, if you record from an HD channel, it will be in HD but displayed as SD on anything but HDMI or Componenet outputs for TV1. If you want to be sure to record the SD version you need to choose the SD channel (if available) of that program.

[BobaBird]

The SAT signal will come in on one wire and then uses a DPP Splitter to supply both SAT inputs, these will be supplied but are not standard UHF/VHF splitters.Separator. DPP Separator. A splitter of any kind can't be used at all for this function.

[garys]

The SAT signal will come in on one wire and then uses a DPP Splitter to supply both SAT inputs, these will be supplied but are not standard UHF/VHF splitters.


Very true, it's name is a DPP Separator, it looks and acts like a splitter but only works with DPP lnb's/switches and cannot be used with single tuner receivers or when trying to backfeed lines to secondary tv's.

[bobukcat]

Separator. DPP Separator. A splitter of any kind can't be used at all for this function.

See woodeye, this is why I told you to post in a forum instead of getting answers via PM, there's always someone available here to correct my mistakes! :kickbutt:

[iamnotherbert]

FWIW, I've learned that the DPP Separator is essentially a diplexer within the higher frequency used by Dish. This is not to be confused with a standard diplexer that combines the lower frequency used by Cable/Ant. with the Sat frequency. Thus, if you are using Diplexers in combination with Separators (as I am), you effectively triplexing.

[BattleZone]

FWIW, I've learned that the DPP Separator is essentially a diplexer within the higher frequency used by Dish. This is not to be confused with a standard diplexer that combines the lower frequency used by Cable/Ant. with the Sat frequency. Thus, if you are using Diplexers in combination with Separators (as I am), you effectively triplexing.

Correct. And my installers do that every day, as do nearly all Dish techs. It works fine provided you use the right diplexers.

Dish "DishPro" and "DishProPlus" receivers pump out a lot more power to the coax than most sat receivers do, and will burn out standard diplexers. It is important that your diplexer is rated to carry 2 amps (most are 750mA or less). We use the Holland DPD2 diplexers.

[scooper]

Correct. And my installers do that every day, as do nearly all Dish techs. It works fine provided you use the right diplexers.

Dish "DishPro" and "DishProPlus" receivers pump out a lot more power to the coax than most sat receivers do, and will burn out standard diplexers. It is important that your diplexer is rated to carry 2 amps (most are 750mA or less). We use the Holland DPD2 diplexers.

That's good information to know...

[glover9]

FWIW, I've learned that the DPP Separator is essentially a diplexer within the higher frequency used by Dish. This is not to be confused with a standard diplexer that combines the lower frequency used by Cable/Ant. with the Sat frequency. Thus, if you are using Diplexers in combination with Separators (as I am), you effectively triplexing.

A DPP Separator is NOT essentially a diplexer. A DPP Separator is designed to allow dual tuner receivers to use one cable in conjunction with Dish Pro Plus LNB's and DPP switches. A separator can not be used anywhere else other than at the receiver and connected input 1 to input 1 and input 2 to input 2. DPP separators can not be used with Dish Pro LNB's or switches. Two cables need to be run to dual tuners when using Dish Pro LNB's and switches.

A diplexer on the other hand takes high frequency satellite signals and low frequency over-the-air signals and combines them (or separates them) and must be used IN PAIRS. Diplexers are commonly used with dual tuner receivers to backfeed TV2 to another room using a single cable to the room where the receiver is located. Remember the "IN/OUT" port on the diplexer must be connected to the "IN/OUT" of another diplexer.

[CABill]

A DPP Separator is NOT essentially a diplexer.

A diplexer on the other hand takes high frequency satellite signals and low frequency over-the-air signals and combines them (or separates them) and must be used IN PAIRS. Diplexers are commonly used with dual tuner receivers to backfeed TV2 to another room using a single cable to the room where the receiver is located. Remember the "IN/OUT" port on the diplexer must be connected to the "IN/OUT" of another diplexer.

You are mistaken to say it is not a diplexer. That is EXACTLY what it is. It splits the signal around 1550 MHz. The high frequency (1650-2150) is sent to one side, and 950-1450 MHz (actually, I think it goes below 950 but I've not tried that) is sent to the low side. Early separators actually had the word diplexer silkscreened on them. It is confusing to call them a diplexer, because the common usage in DBS is to split 950MHz and above from below for "OTA / DBS", but splitting ANY two frequencies qualifies the device to be called a diplexer (or diplexor).

When a dual tuner receiver detects that it can change the signal to the Tuner 2 coax with a command to the Tuner 1 coax, it only looks for 950-1450 on tuner 1 and 1650-2150 on Tuner 2 coax that the separator has diplexed into individual frequencies (only passing DC and Diseq commands on Tuner 1).

[BobaBird]

Early separators actually had the word diplexer silkscreened on them.See http://www.dishretailer.com/ts2003/3/MVC-021S.JPG

[Dishcomm]

See http://www.dishretailer.com/ts2003/3/MVC-021S.JPG
is there a diff between this item and the present seperator that has "DiSEsqC" printed on the seperator? I have always refered to as a "destacker".

[BobaBird]

No difference that I know of. The change to the name Separator I'm sure was to prevent confusing the DBS-band/DishPro-band diplexer with the commonly used OTA/DBS diplexer. They were so successful that people think the Separator isn't a diplexer. I prefer the current state of people (mostly) getting and using the right pieces and not having problems, and educating away an occasional misconception that doesn't affect the end user but may increase his understanding of how it works.

I'm not familiar with de-stackers but, based on the name, I would guess they convert the stacked band back down to the regular band for use by the receiver. The Separator doesn't need to do that as DishPro receivers can already process the regular and stacked band on the same tuner input. With DP Plus, the Separator directs the regular band to one tuner and the stacked band to the other. The receiver tells the DPP switch which sat/tp to put in each band.