[Tech-Assist] terrestrial wi-max interference to sat dish

[Jerry Mathis]

On Mon, Mar 26, 2012 at 4:05 PM, Gary Glaenzer <glaenzer at frontier.com> wrote:
>help !!!!

>have a sat dish where AG's on XDS's remain constant, but Eb's go to pot
>starting about 6-7 AM and get better throughout the day

>Sunday 3 PM were off the  scale on the ABC receiver, >15

>down to 11's this morning, now 14.7

>Clear Channel is a bit lower, about 1-1.2 on Eb's, but it seems CC's Eb's
>are lower every installation where there's an ABC to compare it to

>Skyview for Cardinals and Rams were 12-13 Sunday PM, now 9-10

>dish has been aligned to the point the lock-down bolts are worn out

>local REC recently put up a wi-max tower about a half mile away and any
>signal from 'in-town' is going right over the dish

>any way to tell if this is what's causing my problem ?

>I guess next step is to order one of NorSat's filters and slap it on there

>help !!!!!!!

>G

It would be helpful to know the AG numbers on the receivers.

What I've generally found is the cause of this, assuming interference is not the problem, is simply *too much* signal getting to the receivers. A ">15" reading is one indication of this.

First thing I would try would be to insert some attenuation into the satellite dish feed. Be sure whatever you put in will pass the DC for the LNB. If you don't have the proper RF attenuators, put a long piece (a whole roll, even) of RG-59 coax in series with the sat dish feed. Then watch the numbers over a few days, and see if they don't steady down.

I first ran into this about 10 years ago, and this is still a problem. Even more so, since the state of the art has improved (more powerful satellites, better LNB's, bigger dishes, etc.)

--
Jerry Mathis