Satellite Internet Forum

[iforgotme]

I have hn7000s. Satellite dish is pointed at 227 azimuth, polarization +40 and elevation at 37.

I'm at 44 east 33 north and my feed horn is set up with 505 number and the single hash mark on the throat is away from the assembly like I've read here on satellite internet forum.

In my info, I got with the dish, the LNB polarization is vertical and Tx polarization is horizontal in the manual commissioning info were you enter all the info for the modem. It as receiving polarization vertical and transmit polarization horizontal. Is the receiving and and transmit backwards?

I've tried switching them but it only worsens and I know everything else is correct in my info. We've tried sweeping the sky and everything but best signal is 29. I don't know if you can help.

[JGosselin]

If your nominal receive polarization is vertical then the LNB filter arm should be attached to the spacer tube so that the LNB filter arm is sticking out sideways. The system will now be receiving vertical polarization. This is the starting position. The single tick mark on the spacer tube must be directly away from the support arm. The Prodelin documentation in the antenna box can be misleading as my copy refers to polarization setting but neglects to say that this refers to the transmit polarization.

Now apply the +40 polarization adjustment angle by turning the entire dish using the large circular polarization scale on the back. +40 deg positive means clockwise, while facing towards the satellite.

Your polarization is set manually by you. What it says on the screen is just text. If it does not match reality then the hub has written the text wrong in their hub config.

[iforgotme]

So just move the whole thing, So that the single mark and the feed numbers are still directly away but it now on the side? I will try it. Thank you.

[iforgotme]

I don't spose you could post a picture with what you mean. I've tried posting one but these computers I am on don't let me pull pictures. I tried rotating it but just turning it gives it a 80 polarity is that how you meant to rotate it or the whole thing so that it staying at 0 according to the numbers  on the brakets?

[JGosselin]

The single tick mark on the spacer tube must always be directly away from the feed support arm. There is a joint, with 6 small screws, where the filter/LNB assembly attaches. There are two alternative positions. If the filter arm and LNB are at the side, either side, the nominal receive polarization is vertical. The image below shows vertical nominal receive polarization.

HX Vertical Receive Polarization

hx-vertical-receive-polarisation.jpg (15.21 KiB) Viewed 59 times

If the filter arm and LNB are at the top, away from the feed arm, the nominal receive polarization is horizontal. The image below shows horizontal nominal receive polarization.

Horizontal nominal receive polarization

horizontal-nominal-receive-polarisation.jpg (73.69 KiB) Viewed 58 times

The two small white yokes may now be finally tightened, exactly in the middle or exactly sideways.

Polarization adjustment: If you have the Prodelin dish with the mode match feed there will be a giant circular polarization scale behind the dish where you set the polarization adjustment angle. You rotate the entire reflector and feed arm and radio assembly as a whole using this giant scale.

The image below shows the polarization set to +30 deg. The whole dish has been turned clockwise, while facing towards the satellite. During this polarization rotation, the beam pointing remains fixed, unchanged, towards the satellite, and at right angles to the metal polarization plate scale where you can put an inclinometer. You need to set about +43 deg (my guess).

Polarization set to +30 deg

polarization-set-30deg.jpg (10.3 KiB) Viewed 58 times

If there is confusion about whether or not you are supposed to be receiving nominal horizonal or nominal vertical, don't worry. Just set is one way correctly, with the single tick mark exactly away from the feed arm. Then you can turn the dish +40 deg clockwise - if no good, turn a further 90 deg to +130 deg. That will enable the opposite polarization. It will work perfectly well, even if it looks unusual with the feed arm high up. Note the beam will stay pointed at the satellite all the time.