Just Sharing This My Channel Master 1.8 project.

[stephan94]

Yes, in the evening the signal is much better.
The MIO4K now has a smooth picture.
and the GTCombo signal increased from 37 to 40%.

 

[pitussat]

Yes, I tried to get the best signal.
as I said, Northern Bavaria in Germany

Hi this from north veneto Italy 80km from Austria, of course CM 1,8m and OCTAGON SF8008

 

[Manikm909]

lol loving that skin - what is it.
have u tried changing SNR to DB from user interface. - i know some skins dont accommodate the change.

Hi this from north veneto Italy 80km from Austria, of course CM 1,8m and OCTAGON SF800

 

[Manikm909]

Assuming i'm not having a Senior moment - a few grabs from 45W this morning with the 5 radio channels.
Rx used: GTCombo, PC card 6903/CS, Promax
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View attachment 141175View attachment 141176View attachment 141177View attachment 141178

what dish was this on @John

 

[Manikm909]

anyone one on here using @RimaNTSS arms for G spot optimal setup?

Just Sharing This - My Channel Master 1.8 project.

lol i wondered that too but still cleaned it up. just painted dish (with a roller @moonbase ) :) not sure i'll bother with two coats, unsure

www.satellites.co.uk

(posts 136 and 139)

if so would love to know the length you have the arms set at (to save me lots of tinkering)

 

[John]

what dish was this on @John

Do you know, i can't remember - think almost sure it would have been on the 1.2 CM.

 

[John]

anyone one on here using @RimaNTSS arms for G spot optimal setup?

Just Sharing This - My Channel Master 1.8 project.

lol i wondered that too but still cleaned it up. just painted dish (with a roller @moonbase ) :) not sure i'll bother with two coats, unsure

www.satellites.co.uk

(posts 136 and 139)

if so would love to know the length you have the arms set at (to save me lots of tinkering)

I'm not using Rima's arms but i am using the alternate lnb positioning from Rima's data sheet which i found beneficial on the 1.8CM & the 1.2CM rigs here.
There's not a lot of physical shift between the positions and a bit of simple small brackets might do the trick. I'll take a quick pic of what i mean and post later

 

[John]

I'm not using Rima's arms but i am using the alternate lnb positioning from Rima's data sheet which i found beneficial on the 1.8CM & the 1.2CM rigs here.
There's not a lot of physical shift between the positions and a bit of simple small brackets might do the trick. I'll take a quick pic of what i mean and post later

This is roughly the feed position differences after the alternate feed position is adapted - do not copy this example shown as it's not 100% accurate, it's only intended to give an idea of the difference. Doesn't look much but if carried out accurately, which it must be, it does give improvements
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[Manikm909]

This is roughly the feed position differences after the alternate feed position is adapted - do not copy this example shown as it's not 100% accurate, it's only intended to give an idea of the difference. Doesn't look much but if carried out accurately, which it must be, it does give improvements
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View attachment 141401

thanks @John

 

[a33]

Are there practical guidelines, to choose the ratio between the distances of the two fixing points to the rotation axis?

I noticed (by doing some rough calculations) that the 'zone of highest accuracy' shifts, ...... [ precise calculations: ]
from the maximum retracted actuator zone when the ratio is 1 : 1; ...................................... at zero degrees (from 0 - 180 )
to about 50 rotational degrees from max.retracted zone, when the ratio is 1 : 1,5; .............. at 48.2 degrees (from 0 - 180 )
to about 65 rotational degrees from max.retracted zone, when the ratio is 1 : 2; ................. at 60.0 degrees (from 0 - 180 )
to about 75 rotational degrees from max.retracted zone, when the ratio is 1 : 3. ................. at 70.5 degrees (from 0 - 180 )

(For the calculation approach, I've taken max retracted as zero degrees, and max extended as 180 degrees [no more triangle, but opposites]; as the theoretical maximum possible range.)

By the way: the rotation angle with the highest accuracy can be calculated exact, as the outcome in degrees of this equation:
angle.with.the.highest.accuracy = arccos ( triangle.sidelength.ratio );
where this triangle.sidelength.ratio is defined as ( length.of.small.triangle.side / length.of.large.triangle.side ).

I added the exact angles that correspond to the given ratios, in my quote above.

Based on these calculations, I would shift the maximum accuracy zone (that has the most inches or centimeters per degree) away from the fully retracted zone, and more towards the extended zone (and so spread the accuracy more evenly over the received arc), by choosing a ratio of for instance 1 : 2.
Unless, of course, there might be other reasons that I am not aware of, to not do that.
I have no actuator setup myself, so I might oversee something.

greetz,
A33

 

[Manikm909]

This is roughly the feed position differences after the alternate feed position is adapted - do not copy this example shown as it's not 100% accurate, it's only intended to give an idea of the difference. Doesn't look much but if carried out accurately, which it must be, it does give improvements
.....................................................................................................................................................................................................................................................................................................................................................................

View attachment 141401

would I see any improvement on strong TP's like Sky News on 1w, which is my setup TP on 1w - usually around 16.5db

 

[Manikm909]

would I see any improvement on strong TP's like Sky News on 1w, which is my setup TP on 1w - usually around 16.5db

that was a question @John

 

[John]

would I see any improvement on strong TP's like Sky News on 1w, which is my setup TP on 1w - usually around 16.5db

Good question -
If your only watching or wanting to watch strong domestic tv then in theory yes there should be an improvement but not really needed if you are already getting easy locks with a decent headroom, but you are improving the dish signal collection properties that will come in handy at some stage.
In the case of larger dishes this optimisation of the performance can have an adverse outcome on some already strong signals, using a smaller dish-1.2mtr lets say, will normally be ok and you are then maximising what reflective area you have and also eliminate dish edge noise, on a 1.8 or a 1.2 dish which will effect your C/N performance.
The advantages of optimising the feed set-up will be on very low level fringe reception signals, feed signals and signals with difficult FEC settings where every ounce of captured signal is a bonus and could be by adding that little extra performance will get you a lock as opposed to not.
That's my brief take on it anyway - ** Good work from yourself and stephan94 btw on the GTMedia site with the Combo problems

 

[Manikm909]

i have noticed something strange and annoying with my setup.

after going out to the extreme wests \ 40.5w - 45w when returning to more central or eastern sats - the positions are all out and i have to re-calculate \ store them by - i can nudge over back to perfect signal levels.

i cannot work out why it happens. doesnt happen with East sats.

maybe i should try my 36" actuator and see if it still happens.

 

[moonbase]

i have noticed something strange and annoying with my setup.

after going out to the extreme wests \ 40.5w - 45w when returning to more central or eastern sats - the positions are all out and i have to re-calculate \ store them by - i can nudge over back to perfect signal levels.

i cannot work out why it happens. doesnt happen with East sats.

maybe i should try my 36" actuator and see if it still happens.

How did you setup the positioner (v-box) for counting pulses?
For example, is due south at 000 count and 0.8W at 009 count or are you using some other notation?

Just guessing but if you have similar positions stored for E/W it might be getting confused.
If you have 40.0E and 40.5W stored what are their respective satellite numbers in the v-box?
Same question for 3.0E/3.0W, 5.0E/5.0W and 7.0E/7.0W and 31.5E/31.5W


You could always try the dish on a Jaeger 1224.
They are easy to setup, linear counting across the arc and wider arc range than a polar mount.

Or change the v-box for an RC2000 if you can source one at sensible wad to see if that improves things?

 

[scopus]

What sort of cable are you using for the pulse circuit? I use a seperate cable that is screened for the pulse circuit, I dont have any problem. Its possible that your pulses are being corrupted by interference from the motor cable. As Moonbase says really an RC2000 is the way to go..

 

[Manikm909]

How did you setup the positioner (v-box) for counting pulses?
For example, is due south at 000 count and 0.8W at 009 count or are you using some other notation?

Just guessing but if you have similar positions stored for E/W it might be getting confused.
If you have 40.0E and 40.5W stored what are their respective satellite numbers in the v-box?
Same question for 3.0E/3.0W, 5.0E/5.0W and 7.0E/7.0W and 31.5E/31.5W


You could always try the dish on a Jaeger 1224.
They are easy to setup, linear counting across the arc and wider arc range than a polar mount.

Or change the v-box for an RC2000 if you can source one at sensible wad to see if that improves things?

thanks @moonbase

its not that complicated - the issue is far more simple than that ....

i will try and describe better....

real example:

i move dish to 30w (from any East point) - i get 18.2db on Afro Music (up to this point everything locks correctly at full signal for all the sats going back east to 54e - no nudging needed....)

however,

lets say i'm on Afro Music on 30w, and then drive dish out to 45w for china radio, after i come back to 30w - the signal will be lower, maybe something like 6db (not 18.2 or even close - this is recovered by nudging and storing again) subsequently if then try 7W or 1W it might show low or no signal, until i MANUALLY nudge dish with motor remote to optimise the signal. (these all worked fine previously going up to 30w and back to east sats etc)

i just cannot work out why this happens.

i could understand it if the positions didnt lock again to optimum levels when nudging, possibly caused by when moving the dish that far, it makes the pole lean \ bend, BUT if this was the case, I wouldnt be able to get everything back again.

its putting me off going out WEST - to play with CBAND at the moment

 

[cokeaddict]

Sounds like you have play in the actuator.

 

[Manikm909]

Sounds like you have play in the actuator.

unlikley as its new and heavy duty , and i would see the issue across the arc

however what I have noticed, is that if i go from say 1w straight to 45w - it seems to keep things ok.

but if i go from 1w - 7w - 30w - 45w and then back to 30w - thats when the issues start.

so i'll just make sure to go from centre to extreme west and back to centre again.

 

[moonbase]

Sounds like you have play in the actuator.

If there was play in the actuator I would have thought it would apply to both East and West satellites?