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MMDS Set-up Complete Beginner
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smartjj72
Newbie
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3. May 2007 @ 03:14 |
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Hi All,
Would really appreciate your help. I have NT* MMDS in
the house(most basic package) - North Dublin.
It would be great to have all the movies and sports!!
Could anyone please tell me..
1)The name of the box I need
2)Where I can get the box
3)What to do with the box
I'm totally new to this and appreciate any help
Thanks a mill
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Member
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8. May 2007 @ 14:06 |
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Any of the boxes will do the trick. Dreambox 500 C, DBox 2, Starview, Eurovox or Replay.
Al
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Wombatman
Newbie
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15. May 2007 @ 08:46 |
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Any one ever setup an MMDS aerial and starview box without bringing Cho us or N*l into it. Might accidentally pick up their signal though. Could you get one of these for example?
This message has been edited since posting. Last time this message was edited on 15. May 2007 @ 08:47
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mgb17
Senior Member
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15. May 2007 @ 08:53 |
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You need a antenna for mmds with downconverter.
Btw Chorus mmds is not functional with a cable box.
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Wombatman
Newbie
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16. May 2007 @ 01:39 |
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Its n*l in my area. Where would one get hands on correct antenna with downconverter? What is a down converter? Is it a board you pass the coax through?
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mgb17
Senior Member
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16. May 2007 @ 04:13 |
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Mmds is being broadcast in the 2.5 Ghz range and must be downconverted to the 200 to 400 Mhz range. A box tuner cannot handle the high frequency range. There is also a power inserter for the downconverter necessary.
I don't think all matching parts are available on the free market.
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dc69
Member
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16. May 2007 @ 07:59 |
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ebay no 1701096423 might work for the downconverting
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Fano
Member
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18. May 2007 @ 12:30 |
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I am looking at getting Chorus MMDS.
I have a Dreambox 500T .
All I need is an aerial but these are prob hard to source ?
I prob need to subscribe to a basic package on Chorus and then replace the supplied box with the Dreambox.
Is that the gist of it ?
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Fano
Member
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19. May 2007 @ 04:06 |
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dc69
Member
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19. May 2007 @ 20:01 |
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looks like it anyway
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Fano
Member
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20. May 2007 @ 03:29 |
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Do the Chorus aerials have the downconverter built into the antenna or is it separate inside the house near the receiver ?
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mgb17
Senior Member
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20. May 2007 @ 11:10 |
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The older chorus antennas have the downconverter at the backside off the aerial and the newer ones builtin into the feedarm.
The black box near the receiver is the power inserter.
The item from the link has not exact the same downconverting numbers and I guess the power supply supports only 110 volt.
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Fano
Member
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20. May 2007 @ 15:12 |
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The power supply runs from an AC voltage source of 100-240V AC so that is fine.
MMDS channels are 2,500 MHz to 2,686 MHz,the block downconverter output signal frequencies are 222 MHz to 406 MHz.
The numbers seem to match.
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mgb17
Senior Member
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20. May 2007 @ 18:11 |
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The output for irish mmds is 218 to 402.
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Fano
Member
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21. May 2007 @ 03:29 |
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The difference in the down converted frequencies shouldnt be of consequence ?
All the downconverter is doing is down sampling the incoming signal to uhf.
The exact freq range need not be exact ,just as long as it is between 200mhz and 800mhz.
The dreambox 500t's tuner should be able to pick up the resulting intermediate frequency and decode it .
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Wombatman
Newbie
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21. May 2007 @ 03:41 |
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This is the only one I could find on the net. Any one else have any links?
Do you think if I got the antenna above and this baby, I would be good to go?
P.S. Trying to get my hands on a second hand n*l setup but no joy yet.
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Fano
Member
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21. May 2007 @ 03:59 |
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Originally posted by Wombatman:
This is the only one I could find on the net. Any one else have any links?
Do you think if I got the antenna above and this baby, I would be good to go?
P.S. Trying to get my hands on a second hand n*l setup but no joy yet.
There are lots of similar Down converters on the web but nearly all are sold by wholesalers so they are very hard to get by an individual.
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Fano
Member
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21. May 2007 @ 04:05 |
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Wombatman
Newbie
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21. May 2007 @ 04:13 |
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Nice one Fano. Thanks.
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mgb17
Senior Member
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21. May 2007 @ 10:41 |
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Originally posted by Fano:
The difference in the down converted frequencies shouldnt be of consequence ?
All the downconverter is doing is down sampling the incoming signal to uhf.
The exact freq range need not be exact ,just as long as it is between 200mhz and 800mhz.
The dreambox 500t's tuner should be able to pick up the resulting intermediate frequency and decode it .
The problem is the channel scan. The standard channel scan expects channels at 218 234 250 at so on.
218 is downconverted 2.500 mhz, 234 is downconverted 2.516 and so on.
With different downconverting the channels landing at other frequencies.
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Fano
Member
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21. May 2007 @ 12:12 |
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Quote:
The problem is the channel scan. The standard channel scan expects channels at 218 234 250 at so on.
218 is downconverted 2.500 mhz, 234 is downconverted 2.516 and so on.
With different downconverting the channels landing at other frequencies.
So it wont work then ?
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mgb17
Senior Member
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21. May 2007 @ 12:27 |
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If you are able to tell your box what you want then its possible.
The standard chorus mmds scan is not functional with IF222.
Maybe its easier to buy a old mmds antenna at a garage sale.
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Fano
Member
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21. May 2007 @ 15:44 |
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So the Chorus MMDS downconverted freq range is 218 to 402Mhz.
Thats a spectrum of 186Mhz.
How many channels are transmitted in this spectrum and what is the freq spacing ?
The AFN TV Antenna I was looking at has 31 channels with 6Mhz spacing.
The standard Chorus mmds scan that you are speaking of is some sort of tool in the image one loads on the Dreambox ?
One would have to edit this so as its not possible to just scan every freq between 218Mhz and 402Mhz ?
I'm trying to source an old aerial but they are pretty scarce.
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mgb17
Senior Member
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21. May 2007 @ 15:52 |
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The spacing is 8 mhz and the frequencies between are used for analogue mmds.
Currently 11 frequencies for digital and 11 for analogue chorus mmds are possible. Which frequencies are in use for digital depends at the mmds transmitter. Either 1. 3. 5. and so on or 2. 4. 6. and so on.
The standard scan is defined in the terrestrial.xml for Ireland.
Chorus didn't collect the mmds antennas in the past.
Some ex subscribers bin the antenna after some time or sell it at a garage sale.
You need a aditional power inserter if you get such a aerial.
This message has been edited since posting. Last time this message was edited on 21. May 2007 @ 15:57
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Fano
Member
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21. May 2007 @ 16:23 |
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Thanks for that info Mgb17.Very insightful.
So the ATN downconverter would correctly translate the necessary 22 channels of data but the IF frequencies are not a match for the terrestrial.xml file so the dreambox cant see them ?
i.e The info is there but the dreambox cant see it unless the scan frequencies are edited.
Can one just scan manually entered frequencies or edit the frequencies in the xml file ?
It seems getting a suitable downconverter is a difficult task .
This message has been edited since posting. Last time this message was edited on 22. May 2007 @ 08:50
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