Setting up a Motorised system to pull in weak signals for Feed Hunting

[antrabe]

AT the moment not movement with the same screw it woks fine. Thank you very much how did you get the 43.3 degrees ?

it’s a pity that with 1.9m I can’t get the footprint of uk where are bbc ITV etc here in Spain only in the center from Galicia to Almería.
Time ago I catch all without problem I think for Gibraltar.

anyway it works better than offset for feeds.

Thanks again for the support

 

[moonbase]

AT the moment not movement with the same screw it woks fine. Thank you very much how did you get the 43.3 degrees ?

it’s a pity that with 1.9m I can’t get the footprint of uk where are bbc ITV etc here in Spain only in the center from Galicia to Almería.
Time ago I catch all without problem I think for Gibraltar.

anyway it works better than offset for feeds.

Thanks again for the support

@antrabe

I used an online calulator to get the values.

All that was required was the latitude and longitude of your dish location and which satellite was to be used to centre your polar mount. There are only two angle values to be calculated by the online tool:

1. The polar mount axis angle (equal to the dish face angle)
2. The declination offset angle ( the forward tilt angle that gets the dish to traverse the arc)

Once you have these values it is a simple job to setup a polar mount provided you have a reasonable inclinometer capable of measurement to a tenth of a degree. The same procedure can be used for an H-H motor as well as a polar mount.

I hope you have fun with your setup.

 

[moonbase]

...Thank you very much how did you get the 43.3 degrees ?...

The 43.3 degrees is the sum of the polar mount main axis angle (38.05 degrees) and the declination offset angle (5.25 degrees).

The logic of the procedure is:

1. Peak the dish on the 4.85 degrees West satellite (your polar mount zenith satellite) using the elevation bolt, record the dish face angle. It should be somewhere near to the 43.3 degrees.

2. Tilt the dish downward by the amount of the declination offset angle using the declination adjustment bolt(s)

3. Raise the dish back upwards using the elevation bolt to the dish face angle recorded from 1. above.

 

[a33]

See Satellite finder, how to point dish with magnetic north, azimuth and elevation program calculator. for the satsig calculator.
It uses modified motor angles, which is good!

It is an informative website.
However, the offset dish calculator ('finding satellite dish offset angle') from satsig gives wrong outcomes for length from top of dish to focal point, and length from bottom of dish to focal point; so you cannot find the proper focal point from that calculator IMHO.

Greetz,
A33

 

[antrabe]

Maybe is already replied but which lnb is advice for feeds I’m using invacom 0,3db 4 outputs. Could be adapted inverto black ultra 0.1db which I use on offset 1.10m?

 

[moonbase]

Invacom Quad LNB is a good LNB for a Prime Focus dish. You could modify the Inverto black ultra by fitting a C120 flange to it, or use a 40mm collar feed holder for a prime focus dish with the Inverto black ultra without modification.

I do not think there will be much difference between them. I have tested a 1.8m prime focus dish in Ku-Band with Inverto black pro and Invacom and I prefer the Invacom, test result attached below.

.

 

[william-1]

Dish size guide 53E to 30W by William-1 February 2023
This Dish size guide is for Active Ku Band Satellites that I received in the East of England
Fully revised & updated February 13th 2023 (53 east to 30 west)
Some of the satellites have been replaced since my last issue =**...........William-1

Express AM6-----------------------53°east--------90cm to 120cm
TürkmenÄlem/MonacoSat------52°east--------90cm East & West beam
Belintersat 1---------------------51.5°east------100cm Europe
Türksat 4B -----------------------50°east--------60cm Europe
AzerSat-1 ------------------------46°east--------100cm for European beam
AzerSpace 2 / Intelsat 38---------45°east--------80cm European beam
Turksat 3A & 4A-------------------42°east -------80cm for West beam
Hellas Sat-3----------------------39°east--------70 to 90cm Europe
Hellas Sat-4--------------------- 39°east--------70cm Europe
Eutelsat-36B----------------------36°east--------90cm Europe
Eutelsat 33F ---------------------33.2°east -----70cm Europe
Astra -2E/2F/2G-------------------28.2°east------45cm to 60cm.
Badr- 8 **------------------------26°east--------90cm to 100cm
Astra--3B-------------------------23.5°east------60cm to 120cm
Astra 3C **--------------------------23.5° E-------60 to 100cm
Eutelsat-21B----------------------21.5°east------90cm to 120 cm
Astra-1-KR/1L/1M/1N------------19.2°east------45cm to 60cm
Eutelsat 16A----------------------16°east--------80cm to 100cm
Hotbird 13F & 13G **------------13°east--------70cm Europe
Eutelsat-10B **-----------------10°east--------90cm to 100cm for most transmissions
Eutelsat -9B ----------------------9°east--------70cm Wide beam
Eutelsat-7B/7C --------------------7°east--------80cm to 120
SES-5 -----------------------------5°east-------100cm to 240cm for these Nordic beams
Astra 4A---------------------------4.8°east-----100cm to 240cm Nordic beam
Astra 4A --------------------------4.8°east-----80cm European beam
Eutelsat 3B -----------------------3.1°east-----80cm to 120cm

Thor-5,6 & 7 -----------------------0.8°west-----------80cm European beam
Thor-5,6 & 7------------------------0.8°west-----------120cm for Nordic beam
Intelsat-10-02 ---------------------1°west-------------90cm
ABS-3A------------------------------3°west-------------100cm to 180cm
Amos 3 & 7--------------------------4°west-------------100cm to 180cm
Eutelsat 5 West B ------------------5°west ------------45cm to 60cm Transalpine beam
Eutelsat 7 West A-------------------7.3°west-----------100 to 120cm
Eutelsat 8 West B-------------------8°west-------------100cm to 120cm
Express-AM8-------------------------14°west----------80cm
Telstar-12 -------------------------15°west -----------90cm
SES-4 ------------------------------22°west -----------90cm
Intelsat 901 -----------------------27.5°west ---------80cm
Hispasat 30W-5/30W-6---------30°west------------80cm to 90cm

Satellites with no regular Ku band transmission have been removed from this list,
This is just a guide some transmissions may require a larger dish depending on your location,
Also remember if you are after feeds these are sometimes a lot weaker & require a larger dish.

 

[7mdish]

Great job William! As always.