Re: Fw: [Repeater-Builder] Direct TV type dish?

25 Oct 2004 00:34:03 -0000

We use a Terk BMS 58 multiswitch for the most part. They retail for 129, you can find them on amazon.com for 85 i believe. If you need to put up the third dish for sat C and combine it in, you will need a Sat C kit. This is simply a 2-gig 2 way combiner. It combines one of the feeds from B with the feed from C. A and B have 2 feeds (one for each polarity) and C only has one. One of the polarities (pardon the spelling) on B only utilizes half or so of the available transponders, so C fills up the other half. The multiswitch (or voltage switch) locks each input to one of the four signals coming from the dishes. It then routes the incoming feeds to the outputs that call for them. One polarity operates at 13V, the other at 18V, so your satellite receiver will send out the appropriate voltage for the the polarity it needs. But wait- you say- there are 4 inputs and only 2 voltages, how can this possibly work??? Simple. A 22 kHz tone is sent when the receiver needs the second satellite feed. When you flip through your signal meter and look at the transponders, all of the odd numbered ones are one polarity, and all of the even are the other. This is all useful info when you are troubleshooting.
 
As for the antenna input on the multiswitch-- NEVER USE IT! Typically there is 12-18 dB of loss through a multiswitch. If you need to use one coax, use a diplexers to combine it after the switch.
 
Good luck with the 48" dish. Let me know if it all works out fine. If you find you are missing some channels or transponders for some reason it may be that the the dish is too big and focused and you are missing one or more of the birds at 101. There are three just at 101.
 
As for the competition between directv and dish- they can still get along with each other. How do I know this- you ask? The 110 (C) sat is shared by both Directv and Dish Network in perfect harmony.
 
I thank everyone for putting up with this off the topic thread as well. If it makes any difference I am working on my Mitrek Repeater project right now as I write this. I was able to borrow a spectrum analyzer so I just finished tuning the duplexer. Nice to have the right tools for the job.
 
Thanks!
 
Tom
W9SRV

Tony King - W4ZT <[EMAIL PROTECTED]> wrote:
I haven't combined dishes YET... the multiswitch I have is for a single dual LNB but there are 5x8 multiswitches out there that claim 4 LNB plus antenna input for 8 outputs. Do a Google search on "directv multiswitch" and you'll get thousands of hits, mostly folks selling them. Just be sure that you get one designed for Directv control. Perhaps Tom or one of the other guys will have a suggestion for one they've used. I'd be interested in their ideas too.  Right now I am not looking for multiple satellites, rather very solid signal from one, to get rid of as much rain fade as possible.

Thanks to the group for tolerating this slightly off topic thread :)

73, Tony W4ZT

At 11:00 AM 10/24/2004, Maire Company wrote:
What direction would I go to look for one.  any model you have the best luck with?  thanks
----- Original Message -----
From: Tony King - W4ZT
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, October 23, 2004 10:14 PM
Subject: Re: Fw: [Repeater-Builder] Direct TV type dish?

Use a multiswitch.

I'm working on a 48" dish right now for looking at 101 alone ;)  Hope to be rid of a LOT of rain fade.

73, Tony W4ZT





At 09:00 PM 10/23/2004, you wrote:
Tom,
a little help here?   if I am going to look at sat. A  and sat. B with 2 dish's  is there a way to hook them into the same input on one receiver?
thanks John      [EMAIL PROTECTED]
----- Original Message -----
From: TGundo 2003
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, October 16, 2004 11:16 PM
Subject: Re: [Repeater-Builder] Direct TV type dish?

I work for a high-end Custom home electronics company and deal with directv all of the time. Heres a few bits you may or may not find intresting.
1. Rain fade. Want to limit this? Put up three 1 meter dishes to look at the birds and have better signal reception. Yes, its an eyesore, but you hardly ever get rain fade!. The dishes are getting smaller and looking at three different positions in the sky, so they give up gain with the dish itself to look at all of these at the same time. They get away with this because the birds themselves are relativly high power. You can use up to a 1 meter dish to look at any one position in the sky and get much better signal, but not any bigger because again, the dish is too focused, At the 101 degree position there are actually three satellites which if I remember right are about 50 miles apart from each other in orbit, but at 24000 miles away thats virtually a single point in the sky from here. However, a dish bigger than 1 meter can single out one of the satellites. For you who have directv and have looked at your signal meter, with a 1 meter dish setup almost all of the transp! ond! ers will read 100 all of the time with clear skys or even light clouds, and you hear toto flying by when rain fade actually knocks the signal out all together.
2. For long runs or commercial installs the standard is RG-11 coax to maintain signal level. There are amplifiers used for this as well. Stacker systems are becoming more common in MDU and high rise buildings. Basically, conventional satellite systems work 900 to 1500 as noted in a previously. The issue is that the reciever has to send a signal to the dish to switch between the a and b lnbs to look at the different birds, they cant both come down the line at the same time because they are both oviously coming down at the same frequency. You cannot just "split" the signal to multiple recievers because they would battle for control over the dish as channels are changed. Because of that distribution of that to dozens of recievers in a large building starts to get complicated because of  the voltage switches needed to facilitate the switching. The Stacker system sends the second dish feed down at 1500- 2 gig, so that all of the signals are on the line at the same ! time,! a on 900-1500, b on 1500 - 2000. Many of the recievers out there already have tuners built in that can accept the wideband input, just a simple trip into the service menu on the box and turn it on! Now we can amplify and split as needed to feed as many as you want! But RG-11 and 2 gig rated splitters and amps are a must.
Thats my two cents on the matter.
Tom
W9SRV
bob <[EMAIL PROTECTED]> wrote:









>
> From: "russ"
> Date: 2004/10/15 Fri AM 02:00:59 GMT
> To:
> Subject: [Repeater-Builder] Direct TV type dish?
>
>
> Hey Does any one know what frequency that the coax line coming from the LNB's to the receiver is? On direct TV.
> 73 Russ, W3CH
>
> yes the cable is rg6
>

































































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