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K'bick

Last reply Oct 30, 2009 · posted in Free To Air (FTA) Discussion

Proper length of P* 84e feed support arm

Hello to all,

I've been a member for over a year but have never posted so first hello and thanks to all who contribute to making this a great site.

I'm in the process of replacing my rooftop-mounted Fortec Star 1M dish with something more rigid that doesn't lose it's parabolic shape in light/moderate windy conditions. So I recently obtained a new in box Channel Master 84e and a used P* dish (74e I think).

The 84e dish came complete but had a strange looking rectangular feed arm with a dual feed holder and one eagle aspen LNB off to one side (I'll try to attach some pictures). All the P* dishes I have seen have the traditional rounded triangular rib on the top side of the arm.

What I was wanting to do was to put a traditional P* type arm on the 84e to bring the feed back to the center. I have only one TV so one feed centered seems like a better choice than a feed off to one side of a dual feed holder (please correct me if I'm wrong).

In my quest I got what was described as an 84e feed arm from a P* dish but when comparing it to the arm on the 74e dish it is identical. When comparing those P* arms to the strange rectangular arm that came with the 84e the two P* arms bring the feed about 3/8-1/2 inch closer to the dish than the rectangular arm.

I'm pretty confused as to what I've got and I'm hoping someone can help me sort this out. Are the 74e and 84e arms identical or did I just end up with 2 74e arms? What is the actual length of the arm for a P* 84e? If I switch to a P* arm to bring the feed to the center of the dish can I still use that brand new feed from the rectangular arm or should I use the "Dove bar" feed on the P* 74e arm?

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ziggy1222

Oct 29, 2009

Measuring the bottom of the feedhorn arm an 84e is 21" long and a 75e arm is 19 1/2" long. A 84e elliptical feedhorn measures 3 1/2" top to bottom and a 75e feedhorn measures 2 5/8". If you look on the back of your dish there should be a mold number stamped on it as 84e or 75e.

I also have one of those dual mounts from a WSnet dish and will reconfirm that it is for 6 degree spacing...I have the owners manual. They used two 75e feedhorns on an 84e dish because as you say...so they wouldn't physically bump into each other.

I would also agree to use the larger elliptical feedhorn(84e) however if you have the shorter 75e arm you will still be under illuminating the dish because its not stepping out as much away from the dish and getting a total view of the dish. In this instance the 75e or 84e feedhorn would give the same result(I think !!). At any rate you want to use an elliptical feedhorn(as opposed to a round feedhorn) on an elliptical dish.

K'bick

Oct 29, 2009

ziggy1222 said:
Measuring the bottom of the feedhorn arm an 84e is 21" long and a 75e arm is 19 1/2" long. A 84e elliptical feedhorn measures 3 1/2" top to bottom and a 75e feedhorn measures 2 5/8". If you look on the back of your dish there should be a mold number stamped on it as 84e or 75e.

I also have one of those dual mounts from a WSnet dish and will reconfirm that it is for 6 degree spacing...I have the owners manual. They used two 75e feedhorns on an 84e dish because as you say...so they wouldn't physically bump into each other.

I would also agree to use the larger elliptical feedhorn(84e) however if you have the shorter 75e arm you will still be under illuminating the dish because its not stepping out as much away from the dish and getting a total view of the dish. In this instance the 75e or 84e feedhorn would give the same result(I think !!). At any rate you want to use an elliptical feedhorn(as opposed to a round feedhorn) on an elliptical dish.

I found out (thanks to all of you sharing your measurements) that I had only 84e arms all along. Even my 75e came with an 84e arm - fine for what I want to do with the 84e dish (bring it back to a "stock" P* feed setup) and bad for when I find a use for the 75e.. I'll need to locate a 75e arm somewhere down the road.

phlatwound

Oct 29, 2009

K'bick said:
....I'll need to locate a 75e arm somewhere down the road.

If you are unable to scrounge one:

https://www.impaktproducts.com/Channel-Master-Support-Arm-75E-p-16487.html

ziggy1222

Oct 29, 2009

"I found out (thanks to all of you sharing your measurements) that I had only 84e arms all along. Even my 75e came with an 84e arm - fine for what I want to do with the 84e dish (bring it back to a "stock" P* feed setup) and bad for when I find a use for the 75e.. I'll need to locate a 75e arm somewhere down the road. "

Thats great news...you can shorten one of your 84e arms with a hacksaw and drill a new hole in it for the mounting bolt thereby making it a 75e arm. You got to shorten it by 1 1/2" and the mounting hole sits back just about 1 3/16". The center insert threads with your mounting bolt and slides right out.

K'bick

Oct 30, 2009

Thanks Phlat and Ziggy,

I got one of my "extra" 84e arms from Impakt (it came today). I ordered it a few days back when I thought I had only 75e arms !sadroll ... then I got all the measurements from this thread.

Thats an interesting idea about shortening the 85e arm. There is no difference in the 75e and 84e lnb holders' heights or angles? Its only the length of the arm?

ziggy1222

Oct 30, 2009

"Thats an interesting idea about shortening the 85e arm. There is no difference in the 75e and 84e lnb holders' heights or angles? Its only the length of the arm? "

The only difference is the length of the arm. I have placed both arms on the patio next to each other in my response to you to take accurate measurments...they look identical in every other way except for the length.

Attached are some pictures...please note how the beginning of my tape measure catches some length from the slant on the LNB holder. Also note that the bolt is an 8.8 metric.

This probably goes without saying but I will say it anyway. In order to make this modification near factory perfect I would draw a line all the way around the arm; hacksaw from different sides slightly above my line and file smoothly so as to get a square cut. I would also drill pilot holes 1 3/16" down on each side from my square cut to make sure the holes for the bolt was straight. If you look closely at your dish you will see that the arm butts up against a lip on the back of the dish...measure the distance from this lip to the threaded hole to see if it is in fact 1 3/16". You want this arm to butt up tight to the lip so that it doesn't swivel.

K'bick

Oct 30, 2009

ziggy1222 said:
"Thats an interesting idea about shortening the 85e arm. There is no difference in the 75e and 84e lnb holders' heights or angles? Its only the length of the arm? "

The only difference is the length of the arm. I have placed both arms on the patio next to each other in my response to you to take accurate measurments...they look identical in every other way except for the length.

Attached are some pictures...please note how the beginning of my tape measure catches some length from the slant on the LNB holder. Also note that the bolt is an 8.8 metric.

This probably goes without saying but I will say it anyway. In order to make this modification near factory perfect I would draw a line all the way around the arm; hacksaw from different sides slightly above my line and file smoothly so as to get a square cut. I would also drill pilot holes 1 3/16" down on each side from my square cut to make sure the holes for the bolt was straight. If you look closely at your dish you will see that the arm butts up against a lip on the back of the dish...measure the distance from this lip to the threaded hole to see if it is in fact 1 3/16". You want this arm to butt up tight to the lip so that it doesn't swivel.

Thanks a lot for the pictures Ziggy - that helps a lot!

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Bobby

Sunday at 10:27 AM

Regular$5.999
Premium$6.399
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dishstaller

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Bobby said:
Regular$5.999
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Odd that out there, Prem is only 40 cents higher. Here it's a full dollar more.

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Odd that out there, Prem is only 40 cents higher. Here it's a full dollar more.

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dishstaller

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A "full dollar more" sounds like it may be boat gas (non-alcoholic),

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$4.09 - $4.29, real gas $4.69...

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