How does DPH work?

[RTCDude]

Also we haven't explained what block downconversion (the 'B' in LNBF) exactly is. An LNA (either standalone or as the front section of an LNB/F) simply amplifies the satellite signal without altering its frequencies. On early C-band systems, the LNA was connected to a downconverter, usually via a short length of large-dia. coax using the large 'N' connectors. Couldn't send the signal on regular coax or very far on any coax as it's the microwave-frequency sat signal. The downconverter was typically strapped to the dish pole or to the feed assembly (LNA & feedhorn) and controlled by the rx via wire to select individual xpdrs, which the downconverter then sent in to the rx on regular coax using a much lower-frequency "intermediate" (IF) carrier, typically 70 mhz (this could be called "single downconversion").

With block downconversion, all xpdrs are downconverted simultaneously to individual IFs (a "block" of frequencies), either with a standalone BDC connected to LNA or by using an LNB (which combines LNA and BDC). On C-band, either all 12 xpdrs as V (vertical polarization) would be sent in at once, with the rx then tuning the desired 1 of the 12, or if then selecting a ch. on an H (horizontal) polarization, the rx would command the feed to switch from V to H, and then the same 12 xpdrs as H-polarized would be sent in, on the same IF carriers, to pick from. The limitation was that any 2nd receiver in the home would only be able to select from odd #'d ch's if the 1st rx was on odd, or only even #'d ch's if the 1st was on even. And of course, comparing with DBS, you couldn't view from 2 different sat positions at once. Later C-band options included using a feed with 2 LNB's, one mounted horizontally and the other vertically, to allow for independent odd-even selection (but still limited to same sat).

When DBS came out it continued this same block downconversion for Single LNBFs, adding H/V switching by the device power (on the coax) being toggled between 13 and 18v. Dual LNBFs then allowed the use of added in-line switches to do the toggling to serve multiple rx's, but you had to run 4 coaxes in from the dish (for the initial 500, 2 for 300). The initial 500 Twin had built-in switching and still used 13/18 to switch. DP (DishPro) Twin (and Single) then "stacked" both the H & V signals into 2 differentiated blocks of IFs that all went down the coax together, so you could go straight from LNBF to 2 dual-tuner rx's with no switch in-line (just those HF splitters at the rx's). The freq. stacking resulted in higher-ranging IFs (intermediate block freq's) that sometimes exposed weaknesses in coax runs. DPP (DishPro Plus) merely added an input to the DP Twin/Triple that could combine in the output from a DP Single on a separate dish with no need for a combiner/switch. DP & DPP are exactly the same to rx's save for this added input connection.

Now somebody gets to explain how the DPH works, as I have no idea...

Ok, I'll start. On another thread telstar_1 posted the above about the early days of LNA, LNBA, LNB, LNBF development progression. And at the end asking about how DPH works; I'd like to know that too. Can anyone give a detailed description on how DPH works?

 

[HipKat]

DPH (DISH Pro Hybrid) technology is a versatile satellite reception system that can switch between multiple DISH technologies depending on the receiver connected to it. Here are the key features:

Compatible Technologies:

• DP (DISH Pro)
• DPP (DISH Pro Plus)
• DPX (DISH Pro Extreme)
• DPZ (DISH Pro Zip)

Key Capabilities:

• Supports band stacking (2 tuners) or FSK channel stacking (16 tuners)
• When in DPZ mode, only port 1 outputs DPZ signal and port 2 is disabled
• Internal switching capability that can be disabled when connected to external switches
• Compatible with various receiver configurations:
  • 2 ViP Single tuners
  • 2 ViP Dual tuners
  • 2 Hopper 2000's or Hopper With Slings
  • 1 Hopper 3 (Port 2 turns off when connected)
  • Up to 8 Wallys in dual tuner mode with DPZ Channel Stack Splitters
  • Up to 16 Wallys in single tuner mode with DPZ Channel Stack Splitters

 

[HipKat]

By comparison…

Based on the provided context, here are the key details about DISH Pro Plus (DPP) technology:

DPP Technology Features:

• Frequency Range: 950MHz - 2150MHz
• Requires minimum 2150MHz rated RG6 and components from LNBF to Receiver

Communication Features:

• Uses two-way DiSEqC communication
• Employs Band Stacking technology:
  • Creates two satellite frequency bands for two tuners
  • Odd and even transponders share a frequency band
  • Each frequency band has two-way communication

Key Capabilities:

• Supports 2 tuners per coax
• Splitter support designed for TV2 or OTA feeds
• Diplexer support for OTA or TV2 feeds in 49MHz - 900MHz range
• Check Switch test takes 1-5 steps depending on equipment attached

Diplexer Support Notes:

• OTA and TV2 feeds require minimum 900MHz rated RG59
• OTA and TV2 feeds cannot be diplexed simultaneously as they run on the same frequencies and will interfere with each other