Moment of insanity... (1 Viewer)

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T4Runner

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Apr 3, 2010
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37.0N 119.5W California
I have a pile of extra dishes not being used and a 62ft ham radio tower. The idea occurred to me that to be able to get 30W KU which is a minus 8.3 deg. Almost due East, I need to elevate the dish and/or invert it; but how much?

I can attach the dish to the tower comfortably at 17ft above ground. Think it will pick up a below horizon sat???

And, on another note, is anyone in California able to get 30W?


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T4Runner

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Apr 3, 2010
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37.0N 119.5W California
Well, I labeled this "moment of insanity" didn't I? Okay, I knew the answer, but had a McGiver flash.....


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Martyn

SatelliteGuys Pro
Sep 25, 2005
614
246
Annandale, VA
Unfortunately ... I don't think you're close to getting it. But. it's an interesting question.

The horizon is about 3 miles away when you're standing on the ground (assuming flat ground, right?)

We can use this to work out how far you can see at 62 feet .... or just Google and find someone who has already done the calculation:

http://blogs.discovermagazine.com/badastronomy/2009/01/15/how-far-away-is-the-horizon/#.U_exhbxdUkk

At 62 feet high, you're seeing about 9 miles away, which probably isn't much help for anything. If you live up on a hill, you're already winning, but to go the few hundred miles to get Hispasat, you need to be at 100,000- 200,000 feet, so just watch out for aircraft when you're climbing the tower ;)
 

T4Runner

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Apr 3, 2010
1,034
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37.0N 119.5W California
Unfortunately ... I don't think you're close to getting it. But. it's an interesting question.

The horizon is about 3 miles away when you're standing on the ground (assuming flat ground, right?)

We can use this to work out how far you can see at 62 feet .... or just Google and find someone who has already done the calculation:

http://blogs.discovermagazine.com/badastronomy/2009/01/15/how-far-away-is-the-horizon/#.U_exhbxdUkk

At 62 feet high, you're seeing about 9 miles away, which probably isn't much help for anything. If you live up on a hill, you're already winning, but to go the few hundred miles to get Hispasat, you need to be at 100,000- 200,000 feet, so just watch out for aircraft when you're climbing the tower ;)

That was a fun article. Reminded me of past algebra and trigonometry classes eons ago. I do live in the foothills at 1300 ft. Elev., but I still have hills higher East of me.


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FaT Air

HOA Free Zone
Feb 27, 2010
6,668
914
97W 48N
Figured this out (thread has got to B 2 yrs old now) for a satellite that just 1 degree below the horizon, IIRR, it worked out to something like 40k feet to have 1 degree of separation between the sat and the horizon.
 

primestar31

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Mar 15, 2005
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For extra credit, if Hispasat is on a train that leaves Chicago at noon traveling at 60 mph, and your dish is on a truck that leaves Los Angeles at 1pm traveling at 40 mph, when will SES3 finally go into service at 103W?

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NEVER, because DirecTV owns the truck! :stooges
 

Martyn

SatelliteGuys Pro
Sep 25, 2005
614
246
Annandale, VA
Ha! Did you ever, the FCC kicked back their application for that slot? But just to refiled, so probably a longer delay.

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danristheman

SatelliteGuys Pro
Jan 25, 2011
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I say wait for amc 1 to fall out of the sky comes crashing down then say can we have ses 3 comes online now. Or let it crash down on the front door of the fcc say this is your sign turn on ses3.
 
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DJdish

SatelliteGuys Master
Feb 20, 2010
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Mexico City
For extra credit, if Hispasat is on a train that leaves Chicago at noon traveling at 60 mph, and your dish is on a truck that leaves Los Angeles at 1pm traveling at 40 mph, when will SES3 finally go into service at 103W?

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Beats me, but I´d like to know if theoretically it would be possible to watch the Equity channels on 123w, going back on time, or jumping into a parallel universe or something.
 

waylew

SatelliteGuys Pro
Aug 23, 2010
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northern WEST new york
Beats me, but I´d like to know if theoretically it would be possible to watch the Equity channels on 123w, going back on time, or jumping into a parallel universe or something.
If you can get to warp 9.2 you might catch up with them out around Alpha Centuri somewhere :biggrin.
And no,I didn't do the math :facepalm
 
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T4Runner

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Apr 3, 2010
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37.0N 119.5W California
How many unused dishes are we talking about?


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you asked...

That would be:

5ft solid steel echostar prime focus C band/polar mount
1.2m Channel Master
1m? Forget what size
ImageUploadedBySatelliteGuys1408816408.660048.jpg

ImageUploadedBySatelliteGuys1408816451.720300.jpg


And numerous and sundry feedhorns and LNBs, couple C band Actuators, couple new KU dishes, and might even throw in a chicken that is going to end up in the stew pot if she doesn't start laying eggs again!


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Kraven

Resident Bozo
Jun 2, 2012
11,912
2,932
Northern, VT
Just thinking.. would a 5ft C* dish perform better than a 1.2m offset minibud? Obviously its bigger but wondering if the
offset angles factor in.
 

FaT Air

HOA Free Zone
Feb 27, 2010
6,668
914
97W 48N
Used Parabola Calculator 2.0 for these
entered 4Ghz as freq

5ft dia prime focus 7 inches deep
(actually,, using any depth resulted in the same gain)

f/D = 0.38
Focal Length = 22.50 in.
Illumination angle for feed = 134.8 degrees
Space attenuation = 3.19 dB
Desired taper = 6.81 db for 10 dB edge illumination
A simple feed horn would have a diameter of 0.74 wavelengths for a 3 dB beamwidth of 89.47 degrees
Gain at 50% efficiency = 33.10 dBi

Calculated for a 1.2m offset

Gain at 50% efficiency = 31.16 dBi.If you do really well, you might get 60% efficiency for a gain = 31.95 dBi.

So the 5ft prime has a bit more gain.
Which would concur with it having a bit more effective area. Offset angle has no bearing on gain.
 
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T4Runner

SatelliteGuys Pro
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Apr 3, 2010
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37.0N 119.5W California
Just thinking.. would a 5ft C* dish perform better than a 1.2m offset minibud? Obviously its bigger but wondering if the
offset angles factor in.

I have tried both, and for me the 5ft solid metal C band dish did an outstanding job; but... This was prior to all of the Transition to DVB-S2 and I found the 1.2m dish great for any KU sat channel. But my frustration level tuning DVB-S2 went down in direct proportion to the increase in C band dish size.


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