does anyone have any experience on extending the dish bail for the actuator? (1 Viewer)

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chaskuchar

Thread Starter
SatelliteGuys Pro
Pub Member / Supporter
Apr 16, 2010
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saint charles, missouri
sadoun didn't have the 3618 actuator but are sending me the 3624. so if i get another 6 inches of actuator travel i should be able to extend the bail a few inches and get more reed counts between satellites. does that make any sense to you? so far with the old bail i can see amc6 to amc10 ok, (72W to 135W). but i don't understand the dvb-s2 talk. have to find out about that. fyi, i ended up with and extra polar mount for my 6' dish. it was from sadoun. be glad to ship it to anyone in the us if they can use it. charlie
 

FaT Air

HOA Free Zone
Feb 27, 2010
6,668
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97W 48N
extend the bail a few inches and get more reed counts between satellites
Can't see "why not". Might also get a bit more of the arc.
i don't understand the dvb-s2 talk
It's different modulation. S2 stands for Second Generation. Incorporates more "points"(4 or more) and a pilot carrier. DVB-S only utilized 4, and no pilot.
if they can use it
I think I could possibly put it to use.
 

brentb636

SatelliteGuys Pro
Jun 24, 2006
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5 miles N of Saugatuck, Mi
"It's different modulation. S2 stands for Second Generation. Incorporates more "points"(4 or more) and a pilot carrier. DVB-S only utilized 4, and no pilot. "

QPSK modulation ( used in both DVB-S and DVB-S2) has 4 data points per symbol.
8PSK modulation ( used in only DVB-S2) had 8 data points per symbol, thereby doubling the potential data. There are also more FEC possibilities in DVB-S2, which makes DVB-S2 more attractive for providers because they can squeeze more data into a single transponder on the satellite. The DOWN side on DVB-S2 is that with twice as much data, it's easier to lose some of it, so it tends to require larger, more precisely aimed dishes to acquire a satisfactory signal. That's not a problem for people at commercial headends, but can be a problem for a hobbyist trying to get by with older equipment that was fine for DVB-S signals.
:) Hope I haven't lied tooo much.
 

Pixl

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Feb 27, 2010
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Traverse City, Michigan
Here is a picture of my extended attachment point. It was like shifting your car from 3rd gear to 2nd, takes more rpm to travel the same distance, therefore more counts between sats.

 

Anole

SatelliteGuys Master
Sep 22, 2005
11,819
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L.A., Calif.
I tried to discuss the matter of getting more counts by extending the arm attachment point on the back of the dish.
This was a few years ago.
Nobody seemed interested at the time.
Sounded perfectly natural to me.
- more counts to go across the arc
- more leverage on the dish, so easier to move it in wind or with snow
- so, less load & wear on the actuator
- yea, it's slower; so what? ;)

One thing to think about, is the overall geometry.
You might need to move the pivot point of the actuator back further behind the dish to keep alignment and geometry in the best operating range.
eg: in the picture Pixl posted above, I think moving the clamp holding the middle of the actuator tube directly back toward the viewer, would be desirable.
 

chaskuchar

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Apr 16, 2010
807
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saint charles, missouri
thanks for the answers. i didn't think about being a little slower but that is not a problem. since i am retired i have lots of time... i do like having more counts but i don't think i will get that many. will post feedback about what happens. should have the new actuator next week. and still trying to figure out the modulation methods. used to be a communications technician in the navy dealing with foreign signals so i know about the old ones from the 60's. charlie
 

Pixl

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Feb 27, 2010
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Traverse City, Michigan
One thing to think about, is the overall geometry.
You might need to move the pivot point of the actuator back further behind the dish to keep alignment and geometry in the best operating range.
eg: in the picture Pixl posted above, I think moving the clamp holding the middle of the actuator tube directly back toward the viewer, would be desirable.

Yes it slowed the dish movement down, with a trade off for more accuracy. Ill take it.
Anole, that is an interesting idea.
I might give that a try, see what it does.
Thanks.
 

Anole

SatelliteGuys Master
Sep 22, 2005
11,819
10
L.A., Calif.
off topic: all your pulses are belong to us

(
You could always install a magnet with more poles to yield more counts.
You mean like the one in this thread?..
Love your work, LoneG. - :up

Now, as to more magnets, here are some ideas ...
- bigger diameter wheel
- smaller diameter magnets
- move the magnets closer to the edge of the wheel
- always use even number of magnets, because...
- mark all magnets for polarity, and install 'em with one north, then one south, north, south, etc.
- use smaller reed switch if necessary, to sense the tighter magnetic pulses.

What diameter and spacing (center-to-center) between magnets now?
I'll dig out the super magnets I got for my Birdview project and measure, but I'll wager they're much smaller! ;)

If you're really interested in going for more pulses, we might get you up to 20 magnets.
Then, if you used a Gbox which also doubles the pulses, that'd give you some real good counts! - :up
 
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