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universe

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Posts: 303
Reply with quote  #1 
OKAY guys what do you recommend from Rick's supply store for a feedhorn that will get both linear and circular feeds. Having a 12 ft dish  my loss  will be minut  I WAS TOLD on the linear side...........,I get all the birds 58 west =3 west     there are 11 satellites that are circular. I do not want something from ebay  ONLY FROM RICK   recommendation of a feedhorn for this purpose please. THANK YOU GUYS
RickCaylor

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Reply with quote  #2 
universe,

I sent you an e-mail.

You have already purchased a Chaparral C/Ku Wideband Feed Horn.  This will allow you to do Linear Ku and Circular C.  

In my experiences, you will have quite a bit of Loss of Signal if you try and use that feed horn for Linear C.

I know that with where your dish is located, you will not be able to go to the roof every time that you might want to put in a slab on your C Linear Feed, just to be able to receive Circular C Feeds.

If you are going to want to watch a lot of feeds on Circular C as well as a lot of feeds on Linear C, then I don't have a good option for you myself.  Again, this is because of the location of your dish.  If you had a good ground level view, I would say just put in the slab when you want to do Circular or put up another dish dedicated for Circular C.

Good Luck.

Rick

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Please e-mail or call me if need to make contact @ rickcaylor@aol.com or Ricks Satellite / 816-228-1801.

jimmypop

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Reply with quote  #3 
lol, that's what I do, everytime I wanna check out 47.5w or 40w I go up to the roof, use an arm extender and through the center of the plate I place the dielectric plate, its a huge hassle but that way i don't lose any quality on the linear sats
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Scanning C Band 135º-43º on 10ft'er
& C Band 61º-40º on 7ft'er
from Central Mexico
takoulis

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Reply with quote  #4 
This is a post that i made at Satguys a while back.
 In response to circular polarization, i made my own feed using a Chaparral Polarotor and Av-Comm circular polarizer barrel purchased from manufacturer in Australia i am here in the states using a 7 1/2ft Winegard Quadstar dish getting decent reception on all circular polarizations using a Titanium ASC1 to set skew positions with polarizer it works wonderful with very little signal loss on linear polarizations its a lot better than using the Chaparral Corotor international feed no dielectric plate in the middle of the oppening.I have recently acquired a 10ft Winegard Quadstar which i will be putting up this summer i will be using it with this feed.I just had to machine the barrel on the inside to fit the Polarotor and the front outside to fit Chaparral scalar ring,here are some pictures of my setup. F1342.jpg Av-COMM barrel AV-Comm.jpg Polarotor inserted into barrel IMG_0713.JPG Mounted on dish IMG_0714.JPG IMG_0709 (2).JPG
Setting on ASC 1 Vertical +45  Setting on ASC1 Horizontal -45
  IMG_0708 (2).JPG IMG_0710 (2).JPG Setting on ASC1 horizontal LHC -90


IMG_0707 (2).JPG Setting on ASC1 Vertical RHC  00

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Titanium ASC1 positioner AJAK H-H winnegard 7 1/2 dish, AV Comm polarizer barrel with Chaparral Polarotor feed, Cal Amp 140194 20k PLL C band LNB.   1M ku dish on H-H motor. Openbox S10  DM 900HD Hellobox V7  Coolsat 5000 DSR 6000
universe

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Posts: 303
Reply with quote  #5 
i got a chaparral c/ku wideband    are you telling me this feedhorn you have by  AV-COMM is better? if so how do i buy what you have and i'll pay you to design it the same way you did yours. If we can go through Rick the better, I want to give him the credit if i buy this feedhorn. AGAIN should i keep what i have or go with your baby.?
takoulis

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Reply with quote  #6 
Av Comm is located in Australia you have to purchase the barrel through them and you also need to purchase a Chaparral Polarotor feed, can not use a Corotor C/Ku feed, polarotor can be purchased through Rick you can use your existing C band LNB with the Polarotor but you will have no KU It has to be machined to fit it into the barrel i can not do it as i don’t have a lathe anymore,it works a lot better than the Corotor a lot less signal loss no Dielectric plate involved as you can see it’s all open,you will also need a ASC 1 positioner for skew control settings, it’s a little bit of work involved to put it together but well worth it .
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Titanium ASC1 positioner AJAK H-H winnegard 7 1/2 dish, AV Comm polarizer barrel with Chaparral Polarotor feed, Cal Amp 140194 20k PLL C band LNB.   1M ku dish on H-H motor. Openbox S10  DM 900HD Hellobox V7  Coolsat 5000 DSR 6000
universe

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Posts: 303
Reply with quote  #7 
lots of work. I do not have that kind of skill. There was always the debate, which is  better  Chapparell or ADL........Adl feedhorns cost more, does that mean they are better or just paying for the name. I have a chapparell wideband circ/linear i got from Rick, will the results be better for my circulars with a ADL feedhorn, of course without hurting my linears... 12 ft dish matters i would hope.
gregom

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Reply with quote  #8 
I may want to revisit this post ...

if this is really for real that you get an improvement of 2.5 dbs on linear and circular than I need to change my corotor II plus wideband that has this dialetric plate.

Will this work if I use the ADL circular feed instead and slide the Chaparal single LNB with servo motor?

The ADL feed looks identical to the AVcomm tube ... even the little steps inside the waveguide.


[ADL%20RP3-CP300]




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Large BUD with Corotor II plus+ Kzilla dedicated to KU with R3465 SA + TBS-6983
gregom

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Posts: 992
Reply with quote  #9 
I guess I had to try for myself to believe it ...

Today was a perfect day .... calm winds and no rain at all ... I decided to test two feedhorn and to see if this concept of gaining or loosing dBs exists.

I compared side by side on the same dish using same LNB with a spectrum analyzer. While comparing these signals i didn't change any settings in the analyzer. so it is a true side by side test.

I used a 2.4 offset Channel Master with the ADL (Circular/Linear) feed against the Chaparal Corotor 2 plus wideband feedhorn.

The Corotor II plus is a feedhorn that has a dialetric insert for circular polarization and a C/KU servo motor that you can switch to get Linear or circular depending on the servo skew.

I always wondered as to how much does one person loose on C band because of that dialetric and the Ku probe in that feedhorn that the Chaparal design uses. There is always a compromise by how much we don't know ?

Here are the facts:

- The ADL feedhorn is hands down a well designed and machined feed ... you can tell that their design is nice and proves on its performance.

- The ADL has excellent CNR on the side lobes of the carrier ... it looks like an OMT ..you can see that the ADL has a very sharp and defined carrier while the Chaparal is very noisy or sloppy.

- The gain difference is very noticeable and honestly I was not expecting to have a 2.5-3.5 dbs gain on C band over the Chaparal... that's double the power received ...

In my books any gain you get at the microwave signal is a big bonus ... and 3 dbs is alot and it did surprise me...  

Picture below of ADL Feed it does look like a 12 db signal
ADL.jpg 


Corotor II Plus WB.jpg

Chaparal Feed Corotor II Pluss WideBand looks like a 8.5 db signal.





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Large BUD with Corotor II plus+ Kzilla dedicated to KU with R3465 SA + TBS-6983
universe

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Reply with quote  #10 
I guess if someone wants the best reception for those int birds  58 west=on down  8 to 12db would make a difference for the hard to reach channels,i do not pull in 45 west at all,if i use a ADL  i wonder?
universe

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Posts: 303
Reply with quote  #11 
if the chaparel is at 8.5 db  and the ADL is at 12db's  ,Does anyone make a feedhorn  with a higher DB gain ,Possibly a Seavey or is there another feedhorn company ?
universe

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Posts: 303
Reply with quote  #12 
does any company  make an LNB higher than 12 db's gain or better question what is the highest DB gain possible?
universe

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Reply with quote  #13 
Do we sacrifice linear if we choose a linear/circular feedhorn  OR  because my dish is a 12 footer will size compensate for loss of linears?
gregom

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Posts: 992
Reply with quote  #14 
Here is what I have found based on this testing ...

There is always a trade off when you start to combine everything in one dish...

The best thing to do ... and I really mean it ... is for one to have a dedicated C band dish and a dedicated KU ... Ku 1.2m is probably the best bank for the buck with a good Inverto Black LNB...

On the C band only dish you have a few options ...

If you want linear only you should go with a dual port either Harvard Scientific or ADL or the Chaparal. I would pick 1st: ADL, HS and lastly Chaparal. There are other brands but too expensive for our hobby.

If you want Circular and Linear all in one then your best bet is to use a single C band LNB with a servo motor with the AVCOMM waveguide or the ADL cir/Lin feedhorn and by changing the skew you will receive all polarities... That will give you the best performance...

Having a 12ft dish and using the Corotor II plus wideband it is like having a 8.5ft dish with the ADL Cirular/Linear feed ... imagine a person with a 8.5ft doing the same signal strength as your 12ft ...

Well ... That's the price you have to pay to have C (Cir/Lin Dialectric + KU Linear only) ... 3 dbs ...

For the longest time I didn't think that was for real until I tried myself ....

Get a 1.2 offset from Rick and dedicate that 12FT for C band only...You will be surprised on the performance....


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Large BUD with Corotor II plus+ Kzilla dedicated to KU with R3465 SA + TBS-6983
universe

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Posts: 303
Reply with quote  #15 
until i get a second dish should i get the adl instead of using the chaparell 

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