DMSI SG6100 Review

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KE4EST

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Aug 9, 2004
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Hello guys. Just recently I got to get my hands on the new Motor from DMSI. They are calling it the Monster Motor. The first thing I noticed when I took it out of the box was that it was bigger than the other motors that I have ever had. I mean it wasn't 10 times bigger or nothing but it was notably bigger. I also noted that it had a 7-segment read out on the top. Further investigation tells me that this read out tells you how many degrees that it is from 0 or reference. I also noted that it was made better than other motors that are on the cheaper end of motors. It is not made as solid as the STAB motor, but it wowed me. So anyway I put this thing together in about 10 minutes. I then went out and mounted it to my pole. Also I have done this many times and I also had some marks on my pole so it made things go faster.

Ok it is on the pole then I proceed to mount one of my GEOSATpro 90cm dishes on it. That went easy. I then get my meter out and align it to my true south. It worked great. Very smooth I set my latitude setting and left it. I then went by the chart in the back of manual to set my dish to where it supposed to be. I wish it would have provided the formula to set the dish, but that is only because I am a geek I guess. Now one thing I did note was that where the shaft mounted it was a little loose. I quickly went and found a Allen wrench and tightened that up. Also there is a little play on the inside, which I am not happy with. I should not be able to grab the dish and with very little effort cause the shaft to move back and forth. Now it was not very much just a little, but I guess I am too much of a perfectionist.

So anyway I set my dish elevation as per the manual and it was there almost on the money. I should add that I had already hooked up my microHD receiver and told the motor to go to my true south which is a bit off of "0". So it didn't take to much effort to peak the the elevation and move the motor on the pole just a hair. Ok now time for the test. I go back in the house and have a great signal on 83W(my true south) and watching PB&J TV great. Ok now lets see how good this baby is. So I told it to got to 125W. I watched the dish as it moved. I don't know how they did it but man did that thing go fast. In just a few seconds it had stopped. I went back to my TV and there it was PBS East with some cartoon on. I then set it to go way over to the east at 30W it did that no problem. Then I set it to go back to 125W. In just about 30 seconds it was back to 125W and working great.

What is my opinion so far on this motor? As of right now I am very pleased with it. I would recommend this motor to anyone wanting to have a motor on their Ku dish. I will say this though. I did not try it with DiSEqC I only have used it with USALS with great results in spite of the little bit of play in the shaft. It is supposed to do DiSEqC as well as USALS. I did not try that though.

Equipment used in this test:

microHD receiver
DMSI SG6100 motor

IMG_20130501_163121_836.jpgIMG_20130501_163156_075.jpgIMG_20130501_163204_331.jpgIMG_20130501_163253_984.jpgIMG_20130501_163307_152.jpgIMG_20130501_163315_406.jpgIMG_20130501_163322_483.jpgIMG_20130501_163340_233.jpgIMG_20130501_163419_322.jpg

Ok so what did I do next. Well I decided to try and use a GEOSATpro 1.2 meter dish. Well the shaft was to small so, I sleeved a bigger tube over the shaft to work and it worked well. The dish is 27 pounds and it moved it back and forth with no problem.

So yes I would buy this Monster Motor if you need a new motor.

The only other down side is the new read out display, cool as it is, is that it is on top so you can't see it unless you get a step ladder out to view it, so it is kinda worthless. It also don't work very well in direct sun light, very hard to see. I never used it, even though it is there and works, and actually forgot about it.
 
Yes I know I had the camera set to over expose things.
 
Thanks for the review.

So far it is sounding like a good recommendation for our customers wanting to add a motor to their system.

What is making the unit noisy? A nylon gear should be quiet. Adequate grease?

Would like to know if the slack in the gears can be adjusted? Manual or automatic?

Reliability of DiSEqC 1.2 memory positions? Hold through power down?

Mechanical limits user adjusted? How easy?

If the motor hits the mechanical limiter, does it hang up on the stop block or can the receiver repeatedly move it off?

Does a hard reset move the "0" position to the original center default or set to be the current position?

Thanks for putting the unit through the paces!
 
I have no idea but yep you can't see it. :)
 
Add another question...

Is the dish elevation angle calculated by subtracting the declination from 30 or 40 degrees?

If I have questions, does Radio Shack have answers? :rolleyes:
 
35 Degrees Declination.
 
SatelliteAV said:
If I have questions, does Radio Shack have answers? :rolleyes:

Yes but only if you want to switch to sprint.

Lol :)
 
35 Degrees minus Declination.
 
SG6100 Motor Inside View

The rest!!
 

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Great photos! The unit does appear to be very good construction and appropriate amount of lube.

The shaft gear is nylon and I prefer this over metal to metal gear drives. The nylon gear provides a quieter drive, less backlash and has much better performance in cold weather. Despite the marketing suggestions of metal to metal superiority, in the six years we sold motors, I never processed an RMA for a damaged nylon gear.

attachment.php


Most motor designs place the electronics away from the motor and gears. It caught my eye that the electronics are directly adjacent to the gear and shaft. I am unsure if lubricant on the circuit board might damage the PCB. Maybe someone with better knowledge of the effects of grease or other lubricants would comment on if this? Personally, I would require the manufacturer to insert a plastic or other barrier shield between the circuit board and the gear.

Not sure how the backlash is adjusted or how manual East / West mechanical stops are set.

Overall, looks like a great product and something that I will certainly test and hopefully recommend!
 
Merged a couple threads and posts..;)
 
Kind of looks like the lube is very translucent much like silicon lubricant, also known as dielectric grease. If so it's pretty much non reactive with the circuit board components and conductive material as long as it is pure and as long as it doesn't coat anything that needs to radiate heat. It likely makes a good thermal insulator as well.
Motor does look well made. Certainly a candidate for a replacement if I were to require one. Great pictures Wallyhts. Looks like a real bearing in the top cover for the sector gear shaft. Maybe that's where there might be some play? 1/8 deg or less play wouldn't likely be a big issue, the mount and pole likely moves more than that as the assembly rotates anyway. Better to have just a bit of play than to have it bind.
Wander what the secret is that makes the motor go faster than other units? Maybe a more efficient electric motor design that has become more affordable in mass production to be used in this application...?
One question... the display at the top... how does it mount and how well does it appear to seal out moisture from entering the enclosure?
Also I really do not like the little rubber plugs that cover the switches. These tend to crack & break after a couple of years' exposure to the elements.

Cheers!
-C.
 
Observations from the photos:

Good, bad, et al . . .


- don't see how backlash is adjusted. Will be needed for wear.

- IC sockets? Doesn't seem appropriate for a production device.

- Is PC board held in place by anything besides coax connectors?

- Relay contacts rated 2amps @ 30 vDC. Seems appropriate.

- relays crowded by components. Replacements must be identical size.

- Coax connectors have square shoulder. Do they fit into square recesses in motor casing, preventing connector twisting?

- Looks like limit switches are under big plastic gear.
 
Anole said:
- IC sockets? Doesn't seem appropriate for a production device.
Or it's a great thing if one has any EPROM reader. :)

Anole said:
- Is PC board held in place by anything besides coax connectors?
.
Nope

Anole said:
- Coax connectors have square shoulder. Do they fit into square recesses in motor casing, preventing connector twisting?
.
Good question not sure will look when I get back to town Sunday.
 
Good catch on the PCB supported only by surface mount f-connectors. Might suggest a modification of the manufacturer to support the rear of the circuit board. With the vibrations and sudden movements of a motor in action and those caused by wind load, the f-fitting solder joints might be the fail points.
 
Just wanted to say that I have now been using this motor daily for almost 2 weeks now and used 3 different receivers and it is still performing very well. I have not had to go out and make any adjustments. I am very happy with this new motor!
 
Just wanted to say that I have now been using this motor daily for almost 2 weeks now and used 3 different receivers and it is still performing very well. I have not had to go out and make any adjustments. I am very happy with this new motor!

Hey ke4est .. did you take a pic of the motor on the 1.2m dish??



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