Primestar-invacom Delima

[RollBama]

Ok guys, I need your opinions and or thoughts. I have an old e-75 p* dish, with a reworked mount to fit on my sg2100. I want to add a invacom 031 lnb and a dual circular lnb so that when it is parked on 119 it will also recieve 110 for my dishnet sub. Then I want to be able
to feed a total of 4 receivers, 2 subs and 2 FTA boxes, one controlling the motor. My delima is that the c-120 flange mount lnb QPF-031 will fit on the feedhorn perfectly while the QPH-031 iwll take some tinkering to mount, the QPF is about $40 more than the standard. Is the use of the original feedhorn going to give me enough additionl signal to warrant the price difference, or will the standard QPH-031 work just as well? I think also that I will need 2 4x4 multiswitches or is ther another solution.

 

[gabshere]

if you have the lnbf off the dish (the lnb & feedhorn will seperate) a qpf will match up to the current feedhorn and fit the dish...... the flange c-120 is for a prime focus dish.

I've never been a fan of mixing equipment, there are so many things that can go wrong or the other receiver want to watch a sub while your watching a feed ect.

just a thought the qpf & qph are big ... they do the same as what you have now in the primestar lnb & your dual circular you currently have . so you should be able to mount what you have at no extra cost and have 1/2 the setup without buying a new lnb then you would just need a second setup ( of course this would have two dishes).

 

[turbosat]

This has come up sev times in the past, and most seem to agree it is more troublesome than it is worth. You're better off with the dishnetwork equip for their signals. I'm sure it could be done, I even tried putting a DN twin lnbf on a 1m primestar dish(a fixed dish). With a lot of re-working, I finally had signals from both 110/119. First good rain that came, signal washed right out anyway-even though it was showing 125 signal strength on the dish rec when I finally got it tweaked on both sats.
Granted, it didn't stay out quite as long as with the 20" dish, but still went out. That was the reason for my experiment, I took the lnbf-twin off and made that dish fta only. And got rid of DN shortlly afterward too-FTA has a lot more to offer.

 

[RollBama]

Thanks for the info guys, I know that there are drawbacks on mixing equipment, but another dish in the yard is goning to upset my other half, and besides the cable is already run to the current dish underground and I want to play but I dont want to put that much work into it. My big question is about the difference in the LNB's and the feedhorn and really if it is worth upgrading to either of them. (I am just assuming the primstar lnb even works, I thought I would see what it would do this weekend. On the other downside, if I go with the c-120 flange mount and the p* horn and am not satisfied, It would not be a match to a new round 80 or 90cm dish like the other one would be.

 

[gabshere]

well the QPH will work but it would have to be adapted to fit, and it will fit a 80 cm or 90 cm also but its heavy lnbf and could sag the arms on most smaller dishes..... read other post on the subject. most who have tried a QPH have arms that also have support arms out from the sides. the flange C-120 is for a prime focus dish (one that the feedhorn fits the center of the dish). You wouldn't need the C-120 flange on this dish ..... thats why i mentioned matching up the feedhorn from the primestar to the QPF. maybe several others that have done this will chime in.

yeah give it a try with the primestar lnbf ... i only gained a few points when i switched, main reason is the feedhorn for the primestar is mated to that dish its wide like 36 X 29 and if you look at the feedhorn for it.... its also shaped like the dish. the QPH isn't shaped like the dish so its not a perfect fit for signal reception on this dish (it will still draw in a good signal just not the best that it can) thats why the older primestar lnbf got signals close to what my QPH would get.

good luck

 

[ChuckBoozer]

I've had good luck with the QPF-031 mated to my stock Primestar 84E feedhorn (see attached pics). In my opinion, the QPF-031 is well worth the extra money, and I was able to pick it up for a decent price ($80).

 

[Tron]

The QPF will work on any C-120 flanged feedhorn, regardless of whether it is prime focus or offset. The feedhorn is what is specifically for either a prime focus or an offset dish, the QPF is only an LNB and will function properly on either. The QPH (the one with the feedhorn built-on, or in other words, the LNBF) is for offset only.

 

[gabshere]

oh sorry, i did read the pdf for the ADF-120 on Invacom site that it was only for a prime focus dish..... i misunderstood and was calling the feedhorn a c-120 when it is actually a ADF-120. So thats what i meant "the feedhorn" the ADF-120 is for a prime focus dish..... then my error . i haven't tried one but didn't want to mislead someone to think it would work on a offset dish. the lnb's which i see now are marked c-120 flange with work with both prime focus & offset . sorry for the confusion.

 

[Tron]

I'd love to get one of those QPF LNBs, they're just very expensive. I guess that's what the OP was trying to decide... if it was worth the extra money to be able to use the matched feedhorn for that dish. In the case of an elliptical P* dish, it might be...

 

[tomc585]

I've had good luck with the QPF-031 mated to my stock Primestar 84E feedhorn (see attached pics). In my opinion, the QPF-031 is well worth the extra money, and I was able to pick it up for a decent price ($80).

Thats exactly what I want to do. I have that same equipment. I was trying to find a mount for the invacom lnb to go to the primstar and saw your pictures. I was thinking of milling out the primestar mount to accept the throat of the new lnb. How did you mate up the old feed horn?

 

[stogie5150]

I'd love to get one of those QPF LNBs, they're just very expensive. I guess that's what the OP was trying to decide... if it was worth the extra money to be able to use the matched feedhorn for that dish. In the case of an elliptical P* dish, it might be...

FYI when I had my 84e/QPH combo it did better than the stock feedhorn/can LNB. YMMV.

 

[ChuckBoozer]

Thats exactly what I want to do. I have that same equipment. I was trying to find a mount for the invacom lnb to go to the primstar and saw your pictures. I was thinking of milling out the primestar mount to accept the throat of the new lnb. How did you mate up the old feed horn?

No need to make any modifications at all. Simply swap out the stock Primestar LNB with the Invacom QPF-031 right on the original Primestar feedhorn. Fits perfectly! :up

 

[netbuilder]

If you are looking for another perspective, I have all that equipment as well with several different scenarios. I have left all my before/after/during pics on my site.

Take a look HERE