Thread: Can the cold affect the LNB?

This is making me crazy.
Put on my new jack today and tweaked everything in.
Here is what I was getting for Qs

G3 79
W5 99
G0 95
C3 68
G1 74

The sun is setting now and the temp is going down
C3 is now 38 and sometimes I lose it.
G1 is still about where it was
G0 is down to 38 or so as well
W5 is still at 99

I've checked the coax and it looks like new at the lnb.
This is making me crazy

PS
Using a brand new Norsat 8115

It gets weirder

The screen froze up and so I switched to the adjacent channel and back again.
Now the signal is 66

How far of a cable run?

I had one of the voltage sensored LNBF's die in the Minnesota winter and not work on H polarity but that was below 0
http://www.satelliteguys.us/c-band-s...band-lnbf.html

Originally Posted by Greg Mueller

It gets weirder

The screen froze up and so I switched to the adjacent channel and back again.
Now the signal is 66

I just posted the same type of question in another section. This is happening to me as well since the colder weather hit, I am in the same sort of area you are.

I turn it off and on and flip it back and forth till it comes back to normal. I have a cheapo LNBF on mine though.
I have a back-up to put on but it is only a single output and the one I'm using now is a dual.

In the old days LNB's worked better as it got colder. What may be happening is the the thing is drifting a too much when it gets cold. Thats causing the quality to take a hit. Norsat was a good LNB back in the day. If you have something else to sub it with try it, that is the only way to isolate it. Or send it back and get another one. If the coax is good there is nothing else but the receiver that could be bad. But it works good when it's warmer and unless your receiver is outside getting cold it shouldn't change.

EDIT: Just a thought... Is the polorotor (servo) motor possibly sticking when it gets cold. That would cause your symptoms. What tipped me off is when you switched channels back and forth the quality changed. Think about it if the polarity probe sticks because the polorotor motor is sticking the quality would suffer. Try going to analog channels like 11 and 12 on G1 and change back and forth when its cold and see if you can see crosspolor in the analog video.

Originally Posted by tvropro

EDIT: Just a thought... Is the polorotor (servo) motor possibly sticking when it gets cold. That would cause your symptoms. What tipped me off is when you switched channels back and forth the quality changed. Think about it if the polarity probe sticks because the polorotor motor is sticking the quality would suffer. Try going to analog channels like 11 and 12 on G1 and change back and forth when its cold and see if you can see crosspolor in the analog video.

I was just thinking that.
I think I'll pull the polarotor gizmo off tomorrow and check it and maybe give it a drop of oil.
Funny how by just changing channel back and forth it popped back up to full strength

Iceberg
The cable run is about 100-125' (maybe)

Did ya see this relevant discussion by TruckRacer?
http://www.satelliteguys.us/c-band-s...table-lnb.html

Originally Posted by Greg Mueller

This is making me crazy.
Put on my new jack today and tweaked everything in.
Here is what I was getting for Qs

G3 79
W5 99
G0 95
C3 68
G1 74

The sun is setting now and the temp is going down
C3 is now 38 and sometimes I lose it.
G1 is still about where it was
G0 is down to 38 or so as well
W5 is still at 99

I've checked the coax and it looks like new at the lnb.
This is making me crazy

I get a performance improvement especially on NETV DCII (T4) when it gets below 15 degrees. I don't know what causes this as I've changed my LNB 3 times trying to resolve the issue.