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Re: 139 W to 105W satellite move
To: CRTech <crtech@crtech.org>
Subject: Re: 139 W to 105W satellite move
From: Mark Johnson <kayoucom@mac.com>
Date: Tue, 11 Apr 2017 17:31:42 -0500
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In-reply-to: <CAA8ua=waRVxKdTVWfiC+yMt1_LydV-Dv47qrsES7jKFUz0FNXg@mail.gmail.com>
References: <CAA8ua=waRVxKdTVWfiC+yMt1_LydV-Dv47qrsES7jKFUz0FNXg@mail.gmail.com>

We have done a dozen or more repoints for AMC 8 to AMC 18.  We have experienced AMC-18 from Miami to Virginia Beach to Brewton, AL.

Each one is different. At a small market station with a smaller antenna (3.0) we were able to lock on with a sub par EBNO.  My fear is that when AMC 18 is replaced SES-11 later this year the capacity on the cross pole will fill up and reduce the margins.

Today only the Westwood One XDS carrier has a “neighbor” on the cross pole.  By the end of 2017 I would expect all of the commercial networks to have a cross pole “neighbor”.

We recommend the following:

3..7m Prodelin or similar 

PLL-LNB (Norsat 3220)

Spectrum analyzer (due to the 2 degree spacing and cross pole issue it is critical)

EBNO - the key is to get a 12 or 13 ebno on Westwood One’s XDS carrier.  Since none of the other carriers have cross pole “neighbors” their EBNOs of 14 or 15 can be deceiving.

We will be in ND in May to repoint some antennas. If you need any help, simply contact me directly.

I will also send you a spectrum picture of AMC 18 off list.

Mark Johnson

On Apr 11, 2017, at 5:13 PM, Pat Wahl <pwahl@wwib.com> wrote:

I know the focus of this group has been 89 degrees west, but some of us are starting to re-point our "other" dishes from AMC-8 to AMC-18.

On the FAQ they put out there is a question about 3 meter dish users. The answer is "You could give it a shot." So, I'm wondering who has done that and what results they're getting. Here in northern Wisconsin we are a little slow. Our spring planning is usually governed by groundhog sightings. And, we did have nine inches of snow this morning in our area (it is already gone), and some ski hills are still open.

Our dish is 3.1 meters and in pretty good condition. It is working fine at 139, but I know the margins are tighter at 105. Three things you might share:

What diameter dish? (and maybe LNB? what's critical? degrees K, LO stability?)
How did you aim it? (spectrum analyzer, other meter, receiver?)
What kind of Eb/No readings are you seeing?


Pat Wahl
Chippewa Falls, WI


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