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Hockeynut

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Reply with quote  #31 
I know what you mean about  actuator and positioner working together for repeatability. When ya get that combination leave it be.[biggrin]. Only reason I brought up a multiswitch is that could be a possible answer to send signals both H and V at same time to various sources.

You have given me a little kick to get my 1.8 polar mount project going again.[cool].so many projects and so little time.Hehehe.



__________________
Dish`s--10' KTI,10' Button Hook,10' Unimesh x2.
1.2 Ch Masters parked at 91,103.
1.2 Ch Master with factory polar mount tracking from-58w-127w -Western Ku Dish.
1.2 Ch Master with factory polar mount tracking from-12.5w-81w -Eastern Ku Dish.
1.8 Prodelin with custom built polar mount in the works. Currently parked at 103.
Positioners--Gbox,Vbox`s.
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,VU Solo2 SE,Octagon SF4008 UHD 4K,TBS 5520se,5927,6902,6903,6982.
Graphics Cards--Nvidia GT 1030,Nvidia GTX 960,Nvidia GTX 1060
GOD BLESS AMERICA.
superhero55

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Posts: 511
Reply with quote  #32 
So far, I have to say, repeatability looks strong! Must be this shielded cable I'm using.
superhero55

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Reply with quote  #33 
Quote:
Originally Posted by Hockeynut
Here we go.


1.8
11760-18.4 db`s
12079-15.8 db`s


this is just about what I'm getting.
11760-18.3dB
12079-15.4dB

can you check 91W 12010 V 13329 (ABC News mux) for me please? Getting 14.4dB currently on that on the 1.8m.

Thanks!
Captain_Kurtz

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Reply with quote  #34 
Quote:
on 91W the ABC News is coming in at 13.8dB (which seems low, but there was just another recent post from someone on here saying that's all they're getting on their Andrews 1.8m).


That would be me in FL; I determined that the top of a tree was partially blocking 91W for my 1.8m. It got a great signal from 87W and 103W (on opposite sides of the tree).

I just moved my 1.2m metal (GeosatPro) 91W dish to a different mount here in MD and I'm getting around 14.2dB of C/N on ABC NewsOne

Congrats on the 1.8m dish! If anyone has a domestic source for a polar mount for one, please let me know.
RickCaylor

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Reply with quote  #35 
Quote:
Originally Posted by superhero55


Vbox II and Venture motors never work well together. (Missed counts, etc.).


This is not correct.  Maybe you had issues with using your Venture motor and V-Box II, but for you to say that they never work together is incorrect.

I have local customers that are running this setup for several years with no problems as well as many across the country and many that visit this forum, including some long time satellite dealers.

To make a blanket statement like that is just wrong.

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

superhero55

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Reply with quote  #36 
Rick,

I’ll retract that statement for now. Repeatability seems strong. I did use a new type of cable, 16/4 shielded stranded, with a drain wire. Found it on eBay. Wasn’t cheap! I wonder if Venture has their own positioner?
drdude

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Posts: 28
Reply with quote  #37 
Superhero55, thank you for the excellent pictures and the manual for the real Prodelin polar mount! That's definitely a nice simple design.

Could you do me a favor and measure a couple things on your official Prodelin 1.8M mount? I'll just mark up the things in your picture:

measurements.jpeg 

a x b: the size of the "polar plate"
c: thickness of that plate

d: width of that bracket
e: thickness of that bracket

I'm guessing the brackets that go on either side of the dish tube (the declination pivot point) are going to be the same as d and e?

I'm replicating it, and well, mine so far seems a bit on the heavy side. I'm thinking those brackets ( d x e ) are not standard steel, and instead sheet that's stamped and bent to form the U shape. Standard C or U steel channel is much thicker especially in the corners, which is where a LOT of weight comes into it. Also, my plate (a x b) is probably much bigger to accommodate the polar mount I'm starting with ( a x b = 6 x 17), and maybe thicker ( c = 5/16). 

This is my mock up before welding:

mine1.jpg  mine2.jpg 

superhero55

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Posts: 511
Reply with quote  #38 
Hope this helps!

a = 7 in
b = 9 and 1/4in
c = 1/2in
d = 4in
e = 1/8in
Hockeynut

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Reply with quote  #39 
I like your mock up Drdude. Is that a KTI Cband mount retrofit?. This is a very heavy dish. The ch iron at the bottom of mount would be beeffy for flex at the outer ends but if I may make one recommendation I would make the entire elevation allthread a bit stronger.

Appears just judging by the pic it is only 3/8-16 or 1/2-13 allthread...With the 1.8 Prodelin polar mount here I`m going with 3/4-10.

Nice project.[smile] 

__________________
Dish`s--10' KTI,10' Button Hook,10' Unimesh x2.
1.2 Ch Masters parked at 91,103.
1.2 Ch Master with factory polar mount tracking from-58w-127w -Western Ku Dish.
1.2 Ch Master with factory polar mount tracking from-12.5w-81w -Eastern Ku Dish.
1.8 Prodelin with custom built polar mount in the works. Currently parked at 103.
Positioners--Gbox,Vbox`s.
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,VU Solo2 SE,Octagon SF4008 UHD 4K,TBS 5520se,5927,6902,6903,6982.
Graphics Cards--Nvidia GT 1030,Nvidia GTX 960,Nvidia GTX 1060
GOD BLESS AMERICA.
drdude

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Posts: 28
Reply with quote  #40 
Wow, that (c) is 1/2" plate! I thought it looked pretty beefy in the pictures.

In my case, my dimensions are a x b = 6 x 17, c=5/16

That plate was the most expensive bit at $20, as I had to get them to cut it from new stock - everything else was bits from the "remnant yard", and came to about $22, and there's more steel than in the picture, including a fairly large length of the 4" C channel, some pieces of 5" C channel (which I'm not going to use) and some pipe to make another 4" OD to 3.5" OD adapter.

d=4, e varies as it's standard C channel steel, so it's about 1/4 at the tips of the C, but in the corner it's really thick. See 
https://www.engineeringtoolbox.com/american-standard-steel-channels-d_1321.html
What I have would be the C 4 x 5.4

Hockeynut: Yes, it is a KTI Cband mount retrofit. I got a 8' KTI dish (and a fiberglass prodelin 3.1M) from craigslist about a year ago. I got the KTI mostly for the mount and the actuator. Don't really have a need for a mesh 8'. It appears they used the same mount for the 8' and the 10'. I hope the main part of it is strong enough to put the 1.8 and all my steel bits onto it. It seems pretty beefy, but I can see in the prodelin polar mount manual, their pivot bolt is 1", whereas on the KTI mount it's 3/4". 

The declination rod is 3/4-10 - it's the original elevation rod from the prodelin az/el mount. The original elevation rod on the KTI mount is also 3/4-10. My goal is to not modify the prodelin mount parts at all. The original elevation pivot hole and bolt becomes the declination pivot and bolt, the original elevation rod on the prodelin az/el becomes the declination rod. Basically the only thing not used is the az/el "canister", and the universal joint that was originally on the elevation adjustment. On the KTI mount, the ring, and the original pivot bolt are not used.

Needs 5 more holes drilled (2 in the declination support c channel parts, one in the top of the plate for the declination threaded rod, and 2 in the plate for the angle iron the actuator will attach to), and me to put some more trigger time on the mig welder. Need to do a few more practice welds, especially with some scraps of the C channel to 5/16 plate. I really like the weld, cut, etch method to see what's happening. You can see the weld on the right is pretty good, whereas the one on the left is pretty bad (no penetration on the vertical part), though I intentially cut and etched it at what I figured was the worst spot. Those beads are roughly the 5th and 6th beads I've ever welded!
weld_etch.jpeg 
This is the right side of above:

right_side_weld.jpeg
 
Travel speed ok, but a little inconsistent. Probably could've been just a touch slower.


And this is the left side:
left_side_weld.jpeg 
Travel speed was a little too fast - sharp "V" pattern, and a hump in the middle of the weld.


boblop

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Reply with quote  #41 
Watching this thread made me go outside and look again at my simple 3 motor 1.8 meter dish mount. Mine is simple and strong using what came with the dish and a couple of spare metal parts from my own scrap yard pile. And the parts just bolted onto the mount with no welding needed from me. Because my original mount was an AZ/EL design I did need to solve the twisting feed position (skew) when moving along the arc. I made a cheap way but finally used the $$$ way with a store bought motor driven Ku feed assembly. But this three motor design means you never have an alignment issues and the dish is remotely controlled for all three position axis settings at max output signal all the time. IMG_5029.jpg 

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Never throw it away--cause guys need stuff--a lot of stuff

drdude

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Reply with quote  #42 
Yeah, the motorized skew is a bit of a problem. So far I've really only spent 3.5 days (the long weekend plus Friday afternoon) on this, well plus a couple of hours looking and measuring, and drawing little sketches by hand. And that included getting welding supplies, and clearing out space in the garage to actually have room to weld.

Just picked up a birdview dish along with it's H-H mount - the dish is bent, so probably destined to the scrap yard, unless anyone wants it in the Oregon / PDX area - you can come get it for free anytime, but the next prodelin 1.8 (I have a small stockpile of them :-P) is probably going on the birdview H-H mount!
beano_face

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Reply with quote  #43 
Bob.. that dish setup is awesome... i love it...   

[biggrin]

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- dish = 39" Digiwave, lnbf = dmx 522
- receivers = AZbox premium, Coolsat 6000, freesat v8 nova
- location = Osler, SK, Canada
boblop

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Reply with quote  #44 
I would like to have a bit more east to west travel but at present it moves slowly so it can stop at the perfect place for max signal out. I have a C band only motorized skew control feed and hope to live long enough to build up one of my C band dishes into the three motor control also. But Ku is so fussy about being right on so this dish fills that need very well. These 1.8 meter dishes are the cats meow to have. Those who have found some are indeed the lucky and blessed among us. I am unworthy but thankful to have just the one dish.
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Never throw it away--cause guys need stuff--a lot of stuff

drdude

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Reply with quote  #45 
Guess I never posted the completion photos here
20190907_232250.jpg  20190911_003352.jpg  20190911_004016.jpg  20190911_004046.jpg 

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