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Thread: How to connect a Invacom QPH-031 Lnb?

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    Default How to connect a Invacom QPH-031 Lnb?

    I have had this Lnb sitting around for years and decided to try and use it.
    I have a Dreamlink T5 with a 1000.2 dish and a second larger dish (connected to port #4 of the 1000.2 lnb) to receive Sat 129 because I am too far North for the 1000.2 to pick it up.
    I got the larger dish working on Sat 129 with a standard dp single lnb I had sitting around but I wanted to try the QHP-031 just to see if it would improve S/Q.
    I removed the dp lnb and replaced it with the QHP-031 but got No signal even after trying all the types of lnb's
    in the T5 settings. I tried the coax cable on both circular & linear?
    Maybe this lnb is not compatible with my set-up? Hopefully someone knows what's wrong here?

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    Well, a quick look at google results gives one the LO and output info for the gizmo. Linear out LO is 10.75 and Circular outs use the 11.25 GHz LO. It is going to draw around 0.1 amp--so a little less than a typical LNB (0.15 amp or so).
    129 degree sat is likely what you are looking at and lyngsat shows it as circular, so the 11.25 GHz setting and output ports are the one to use.
    Last edited by jvvh5897; 12-23-2016 at 08:30 PM.

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    Try it all by it's self first, disconnect the coax to the receiver from the Dish 1000 LNB, and run it directly to the QPH-031, see if it's still working.

    It should be set to a standard LNB type, LNB power on, LNB frequency = 11250, and try it on the circular port only.

    The input port on the Dish 1000 LNB should be able to handle it, and you should use Diseqc port # 4 if you try it again.

    Look at your "S" reading this will tell you if the LNB is active or not.

    And be sure that the receiver and power inserter are completely powered off before disconnecting any coax.
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    Quote Originally Posted by Terryl View Post
    Try it all by it's self first, disconnect the coax to the receiver from the Dish 1000 LNB, and run it directly to the QPH-031, see if it's still working.

    It should be set to a standard LNB type, LNB power on, LNB frequency = 11250, and try it on the circular port only.

    The input port on the Dish 1000 LNB should be able to handle it, and you should use Diseqc port # 4 if you try it again.

    Look at your "S" reading this will tell you if the LNB is active or not.

    And be sure that the receiver and power inserter are completely powered off before disconnecting any coax.

    I had it just like you said.
    Coax direct from stb to the dish already tuned to Sat 129 with a single standard legacy lnb. Had signal in the 80's.
    Lnb frequency set to 11250.
    Then I just replaced the legacy lnb with the QHP-031 and got nothing connected to one of the "C" ports on it.
    Then I tried the coax on the "L" just to see but it didn't and shouldn't work there as I was fairly sure I needed to be on Circular.
    I don't think the elevation on the dish would need any adjust as both horns of the lnb's are at the same position on the arm of the dish.

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    Quote Originally Posted by jvvh5897 View Post
    Well, a quick look at google results gives one the LO and output info for the gizmo. Linear out LO is 10.75 and Circular outs use the 11.25 GHz LO. It is going to draw around 0.1 amp--so a little less than a typical LNB (0.15 amp or so).
    129 degree sat is likely what you are looking at and lyngsat shows it as circular, so the 11.25 GHz setting and output ports are the one to use.


    Thanks. Those are the settings I had.

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    I think that the outside "C" port on the QPH LNB is the one you should be using to supply power to the LNB. (direct connection to the STB)(If you have tried it already then ignore this message)
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    Quote Originally Posted by Terryl View Post
    I think that the outside "C" port on the QPH LNB is the one you should be using to supply power to the LNB. (direct connection to the STB)(If you have tried it already then ignore this message)

    Yes that's the way I tried it.

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    Hum. If the LNB is connected right and getting power with all settings correct, but does not work where a single standard LNB does, then I would guess it is a poorer LNB than the standard one. You do have to split the signal in the waveguide to get both linear and circular ports fed--that may mean there is a signal loss of 1/2 there (-3 dB in power terms), or maybe the split requires a little nudge in the pointing to get the signal in the waveguide correctly if they build two entry ports at the waveguide front. That is if the way they build these LNB is the way I think they would have to--maybe they know a better way than what I think would be needed--I haven't researched dual Ku linear and circular LNB design.

    I was surprised the other day when I looked at the newer directv LNB that have one Ku band between 2 Ka band 'eyes'. They made the scaler entry for the waveguides as ovals rather than circles. I suspect they did that to be able to fit in all three with 2 degree spacing between.

    There is a good overview of LNB tech at
    http://www.satsig.net/lnb/explanation-description-lnb.htm
    but they don't cover the way a dual circular and linear LNB works though I did find a little info at
    https://artes.esa.int/projects/dual-linear-and-circular-polarised-lnb
    that shows a way to do it electronically rather than with waveguide split.
    Last edited by jvvh5897; 12-28-2016 at 07:05 PM.

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    The QPH-031 LNB is a single eye LNB, it has dual internal antennas for both Linear and Circular polarization's, you select the outputs with an external Diseqc switch, the circular side runs at 11250 MHz, the linear side runs at 10750 MHz, you switch polarity's with the DC voltage supplied to the LNB, +13 volts for V or R, +18 volts for H or L .

    If you looking at a satellite location with both a linear and circular output bird,(like 91W) then with two receivers hooked to it's dual outputs you can watch both at once, or just switch between the outputs with a switch.

    I have used one for many years, it is a very robust LNB and has good spec's for it's class, it's noise floor rating is .3 dB, and it takes about 100 mA to run the thing.

    I have used one in combination with a Dish 500 system without problems.

    It could very well be that the LNB has died, they do that sometimes, the only problem I ever had was when a wood pecker took out the LNB's eye cover and water got in, they replaced it for free.
    ♫♫♫ I知 a lumberjack and I知 OK ♫♫♫ I drink all night and sleep all day. ♫♫♫



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    Quote Originally Posted by Terryl View Post
    The QPH-031 LNB is a single eye LNB, it has dual internal antennas for both Linear and Circular polarization's, you select the outputs with an external Diseqc switch, the circular side runs at 11250 MHz, the linear side runs at 10750 MHz, you switch polarity's with the DC voltage supplied to the LNB, +13 volts for V or R, +18 volts for H or L .

    If you looking at a satellite location with both a linear and circular output bird,(like 91W) then with two receivers hooked to it's dual outputs you can watch both at once, or just switch between the outputs with a switch.

    I have used one for many years, it is a very robust LNB and has good spec's for it's class, it's noise floor rating is .3 dB, and it takes about 100 mA to run the thing.

    I have used one in combination with a Dish 500 system without problems.

    It could very well be that the LNB has died, they do that sometimes, the only problem I ever had was when a wood pecker took out the LNB's eye cover and water got in, they replaced it for free.
    Thanks again Terryl,
    I bought the Lnb a fews years back and never tried it until now. I thought since I was setting a larger dish just for 129 that I would try it to see if there was an improvement in S/Q over the standard Legacy lnb.
    I do have the 11250 MHz in the settings. Even if the dish needs a little fine tuning for the QPH-031 lnb I can't see it showing nothing as it sits?
    I think it is a very remote chance the thing is dead from New but it is possible I guess.
    All I can do is try it again and maybe try fine tuning the dish to see if that does anything.
    Maybe someone else will make a suggestion sooner or later.
    I thought there would be some people using it?

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    What is your "S" reading when the QPH LNB is connected???

    And what is it when the other LNB is attached??

    Can you take a photo of them mounted? There should be very little difference between the two.
    ♫♫♫ I知 a lumberjack and I知 OK ♫♫♫ I drink all night and sleep all day. ♫♫♫



    Coming soon to a crop circle near you.....

    There is a 66 and third % chance that I'm on the right planet...

    "I'm happier then a Jackalope in a balloon factory"

    "First rule of testing satellites"
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    "Second rule of testing satellites"
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    "Third rule of testing satellites"
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    "Can you HIDE it"?

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    Quote Originally Posted by Terryl View Post
    What is your "S" reading when the QPH LNB is connected???

    And what is it when the other LNB is attached??

    Can you take a photo of them mounted? There should be very little difference between the two.

    My Friend I am off to Mexico for 2 weeks but as soon as I get time I will follow up with your request and report back ok?

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