Feed difference?

CROSSBONES

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My Satellite Setup
1.2m channel master on a jeager 1224 motor. 55cm fibo Gregorian. VU solo2.
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S.Wales
#1
Just having bought another channel master dish, It came with a feed horn, but has a cover on the edge.

Is there a difference between the two pictured?

The numbers are the same.

What is the advantage or disadvantage of the the plastic cover?
 

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rolfw

Believe it when I see it Admin.
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Technomate 5402 HD M2 Ci, DM7000s, Transparent 80cm Dish, Moteck SG2100 DiseqC motor, lots of legacy gear. Meters: Satlook Digital NIT, Promax HD Ranger+ spectrum analyser.
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Berkshire
#2
I have a couple with and a one without, I guess that it keeps the rain off of the membrane.
 

wod

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yorkshire
#3
interesting mine is like one on the left, the right one must be to stop the rain getting on the feedhorn

also is the right one abit longer in size ?
 

CROSSBONES

Specialist Contributor
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My Satellite Setup
1.2m channel master on a jeager 1224 motor. 55cm fibo Gregorian. VU solo2.
My Location
S.Wales
#4
also is the right one abit longer in size ?
No there the same size wod, the cover makes it look longer.

I will try both and measure with my satlook micro.

Just want this rain to stop now'O'-red
 

rolfw

Believe it when I see it Admin.
Staff member
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37,679
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1,281
My Satellite Setup
Technomate 5402 HD M2 Ci, DM7000s, Transparent 80cm Dish, Moteck SG2100 DiseqC motor, lots of legacy gear. Meters: Satlook Digital NIT, Promax HD Ranger+ spectrum analyser.
My Location
Berkshire
#5
Crumbs, 30 degrees here and Bright sunshine with clear skies. :)
 

CROSSBONES

Specialist Contributor
Messages
2,000
Likes
188
My Satellite Setup
1.2m channel master on a jeager 1224 motor. 55cm fibo Gregorian. VU solo2.
My Location
S.Wales
#6
Crumbs, 30 degrees here and Bright sunshine with clear skies
Yes wish I were back in Oxford!

But back in rainy WalesO-no
 

izefisherman

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Ku: 2.4m Aerial PFA / Invacom SNF-031,
C: 1.2m Aerial PFA / MTI 15k,

DM7020-S, DM500S, C-Tech 2100, VBOXII
My Location
Finland
#7
Raindrops and snow will not accumulate so easily on the black plastic cover. Furthermore any water or snow that resists falling off it will be away from the phase center of the horn and should degrade reception less than if it was just on front of the horn as with the membrane version. The black colour will also help the sun melt off any snow much faster.

Wet sticky snow that builds up on the feed of an offset dish is probably one of the major reasons for temporary bad reception up here in the north. The dishes are pointing very low here (elevation typically 13-20 deg for "normal" satellites) and so the LNB is pointing upwards.Easy to cure if the dish is low and easy to clean off but a pain if the dish is roof-mounted since the cause of the problem makes one very reluctant to go up and fix it.

I would pick the black-cover version anytime provided the cover doesn't introduce losses over the membrane.
 
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