horizontal but no vertical?

[rv1pop]

One other side note --- Even AFTER putting the new arms on, extremely cold WX, seemed to cause either the LNB to quit working on one polarity, or the dish to flex toward the old warp. when the temp got above 15 degrees the signal came back in . I did realign the dish and reset the spacing on the LNB face to the dish surface distance and that boosted the signal considerably. Oh, yes, loosten the 4 bolts where the LNB arm bracket fastens to the dish and tighten them evenly (criss cross) to lock the dish to the bracket. This stopped a lot of attempted rewarp. Then adjust everthing on the lnbs and dish position.

I may have gone over this before -- if so, sorry -- but it did seem important to the subject.

[shibby191]

One other side note --- Even AFTER putting the new arms on, extremely cold WX, seemed to cause either the LNB to quit working on one polarity, or the dish to flex toward the old warp. when the temp got above 15 degrees the signal came back in . I did realign the dish and reset the spacing on the LNB face to the dish surface distance and that boosted the signal considerably. Oh, yes, loosten the 4 bolts where the LNB arm bracket fastens to the dish and tighten them evenly (criss cross) to lock the dish to the bracket. This stopped a lot of attempted rewarp. Then adjust everthing on the lnbs and dish position.

I may have gone over this before -- if so, sorry -- but it did seem important to the subject.

Sounds like what I'm experiencing. I'll know for sure once spring comes (be nice to get above 20 degrees sometime soon) and see if the issue goes away. I've got it so I can get a signal on all channels now but V on G19 is still pretty weak. I plan to take it all apart come spring and do a complete realign if the signals don't come back to pre-winter values.

[ANIMA]

Interesting ! The one I, have been working with has the side arms. But, didn't begin having any trouble until the weather turned off cold for the first time this year. With brainstorming we will figure this out for sure !

[rjc3895]

Sounds like what I'm experiencing. I'll know for sure once spring comes (be nice to get above 20 degrees sometime soon) and see if the issue goes away. I've got it so I can get a signal on all channels now but V on G19 is still pretty weak. I plan to take it all apart come spring and do a complete realign if the signals don't come back to pre-winter values.

I'm experiencing the opposite. I can get V on AMC 4 ku band with no problem, but I cannot get H at all. A few times, my blind scan picked up H frequencies, but the signal was too low to even register. Vertical frequencies are coming in at 80 - 90 percent signal strength, but H won't even register a blip. We have had temps in the teens to low 20's and heavy snow since the first week of January.

[Cemguy]

Maybe one of the "techies" can confirm or deny this, but it's my understanding that at least some LNB's have an internal component that actually rotates 90 degrees to to receive Vertically vs. Horizontally polarized signals.

If this is true could it be that, under certain temperature/humidity/etc. conditions, the rotation is hindered?

[Glorystar1]

No internal mechanical rotation occurs in an LNBF. All electronic voltage switching. 13vdc V / 18vdc H

Usually loss of horizontal signals is an indication of bad cables or fittings. Check all connections and test the voltage at the LNBF and verify that there is 18vdc +/- 10% on the horizontal channels.

Corroded fitting, bad coax or defective LNBF?

[elder]

No internal mechanical rotation occurs in an LNBF. All electronic voltage switching. 13vdc V / 18vdc H

Usually loss of horizontal signals is an indication of bad cables or fittings. Check all connections and test the voltage at the LNBF and verify that there is 18vdc +/- 10% on the horizontal channels.

Corroded fitting, bad coax or defective LNBF?

How can one check voltages without risking switch damage?

[Glorystar1]

Turn off the Master Power Switch on the rear panel if connecting or disconnecting a switch.

The switch will not be damaged when properly testing voltage at the LNBF fitting. Be careful not to short the connection.

How can one check voltages without risking switch damage?