|
MMDS Set-up Complete Beginner
|
|
|
gracem
Junior Member
|
27. January 2008 @ 15:15 |
Link to this message
|
Things seem to be moving in the right direct , Thanks mgb17 , but not there yet. on a manual entering at 698 the eurovox locks on to the transponder after about 4 seconds and so on in steps of eight but seems to loose its lock then get it back again. So im thinking that its may be a power issue or do i need to boost the signal before putting it to the eurovox or is it simply my alignment and aerial height ,i would also say that its not finding any channels on those transponders it locks onto as the lock comes and then goes..
|
|
Advertisement
|
|
|
|
|
gracem
Junior Member
|
27. January 2008 @ 15:20 |
Link to this message
|
|
The MMDS adaptor has an output of 18v 0.3A does this have a bearing on the issue?
|
|
mgb17
Senior Member
|
27. January 2008 @ 15:36 |
Link to this message
|
|
Adjust your aerial via the signal numbers at 698 mhz.
|
|
Fano
Member
|
27. January 2008 @ 18:25 |
Link to this message
|
Originally posted by gracem:
The MMDS adaptor has an output of 18v 0.3A does this have a bearing on the issue?
If the lock comes and goes you do not have a strong enough signal.
Your aerial needs to be realigned.
The adaptor will work fine,I've powered Yagis off +12v.
|
|
gracem
Junior Member
|
29. January 2008 @ 17:37 |
Link to this message
|
|
Thanks everybody for their help , today at least for a while a got some stations , so i know that it works , but my setup for the aerial is slap dash and i think i'll need to have it properly mounted on the chimney and aligned
|
|
reddevstu
Newbie
|
31. January 2008 @ 17:13 |
Link to this message
|
Hi All,
have been reading with interest so far. I plan to use a dm600T for the digital mmds transmitter in ballyduff, gorey in wexford.
Will the mmds antenna that was shown in the link http://www.satandcable.co.uk/s/product_i...&products_id=83
work here?
Is the 600T the right box for all mmds or is the cable tuner also used?
Whats the best image to use and where can I find it? Will I have to install the keys seperately or are they available allready in the image? Does the 600T autoroll the keys like the 500c?
Sorry for all the questions guys but just wanted to make sure I have everything covered so I can crack on with it.
Thanks in advance for any help that will be graciously received!
|
|
gracem
Junior Member
|
1. February 2008 @ 20:16 |
Link to this message
|
|
well its been a rollercoaster but i have to say after lots of trial and error i'am up and running but with one question that i'll leave till the end. what i will tell you might sound not real but actulauly works for the all in one aerial om satancable. It needs a reflective layer underneath the yagi(the screw like extensions) tin foil works reflective side under the aerial, now what if found is that if you on the the second element of the yagi(atennenta) which is like an arcemides screw you rest an alumiunium peice of metel from there to the housing pointing vertical the qaulity is just perfect. I have received over 84 chanells on the NTL 6887 symbol rate by just having the aerail in my loft yet i live in a chorus cable area .
Now for the puzzle i can get every transpoer at a level of over 86% but 698 mhz which is 258 mhz in normal it has disappered every other transponer comes in with a level of over 86% , the channels on this freq are disney etc but i cant see why all the others work. I had a fulll signal on 698mhz the other day now its gone im in swords but i have yo say i'm puzzelled why that transponder has gone , has it moved , i asked a friend in lusk tonight on mmds what it was incoming on and they told me 258.
So any ideas? oh and as as add on if you hvae wireless broadband near your arerial which i have in my loft it causes a disturtance(pixelation etc)
Well if anybody can help me on the disney channles is would be great.
Thanks everbody Mgb17 and fano please tell me why that the extra piece of metel rested as i said with the foil works????
|
|
Fano
Member
|
1. February 2008 @ 21:21 |
Link to this message
|
The tin foil is acting as a focus for the microwave signal.
I have made wifi boosters out of cardboard covered in tin foil and placed it behind the aerial of a router.
Ex here http://www.freeantennas.com/projects/template2/index.html
Ideally you shouldnt need the tin foil but as you are inside the loft I guess the signal might not be too strong there.
This is what the structure of an mmds yagi looks like.
http://www.wireless-homebrew.com/wireless/pics/cal_amp_22.png
The wifi router operates at ~2.4Ghz and the MMDS ~2.5ghz so there will be intereference.
The Disney transponder might be weaker than the others so you may have difficulty picking it up.
|
|
mulvihc
Junior Member
|
2. February 2008 @ 16:12 |
Link to this message
|
|
For Dreambox clone in using the Downconverter with integrated power supply as advertised on this site one should be able to pick up the channels which the standard downconverter operating at 222MHZ - 408MHZ cannot pick up due to a problem with these boxes. To get all the channels will I have to manually enter in all the frequencies from 698 up ?
|
|
Fano
Member
|
2. February 2008 @ 17:00 |
Link to this message
|
Originally posted by mulvihc:
For Dreambox clone in using the Downconverter with integrated power supply as advertised on this site one should be able to pick up the channels which the standard downconverter operating at 222MHZ - 408MHZ cannot pick up due to a problem with these boxes. To get all the channels will I have to manually enter in all the frequencies from 698 up ?
You can use a modified terrestrial.xml file or a manual scan from 674-840 in 8 Mhz steps.
For the price SatandCable are charging they should give an installation guide.
The Yagis they are selling are cheap Chinese models far inferior to the better Chinese models and those made by Cal Amp.
This message has been edited since posting. Last time this message was edited on 2. February 2008 @ 17:09
|
|
gracem
Junior Member
|
3. February 2008 @ 17:23 |
Link to this message
|
|
Thanks Fano , with the use of a home made attenna and more foil , i now have all the transponsers and excellent picture quality , wouldnt be confident in using the all in one outdoors as it does require a parabolic but happy now its up and running.
|
|
mayto
Junior Member
|
3. February 2008 @ 18:25 |
Link to this message
|
|
gracem, would you recommend the antenna you bought considering you had to modify it i think. I have a mate interested in buying a mmds aerial as you have done. can you get better quality ones anywhere else? all that i could see was the same one you bought from satandcable.
|
|
Fano
Member
|
3. February 2008 @ 18:44 |
Link to this message
|
Originally posted by gracem:
Thanks Fano , with the use of a home made attenna and more foil , i now have all the transponsers and excellent picture quality , wouldnt be confident in using the all in one outdoors as it does require a parabolic but happy now its up and running.
A good All in One (Yagi) antenna will be as good as a parabolic grid.
The typical gain of a stand alone down converter is 32 db, plus the gain of the antenna rod (18db) =50dbi.
The yagi is excellent for an area where you may have some obstructions, i.e., trees or buildings.
If you are a very long distance from the transmitting antenna, you may need a larger antenna, but then it would probably be a 24 or 28 db gain antenna.
|
|
mgb17
Senior Member
|
3. February 2008 @ 20:38 |
Link to this message
|
Originally posted by Fano:
A good All in One (Yagi) antenna will be as good as a parabolic grid.
The typical gain of a stand alone down converter is 32 db, plus the gain of the antenna rod (18db) =50dbi.
The yagi is excellent for an area where you may have some obstructions, i.e., trees or buildings.
If you are a very long distance from the transmitting antenna, you may need a larger antenna, but then it would probably be a 24 or 28 db gain antenna.
A yagi cannot be as good as a dish/parabolic. There is no antenna rod which can deliver 18dbi.
If you don't need the extra signal strength a yagi is not bad. If you are based more far away from a transmitter or beambender a dish/parabolic is a must.
The amps are not much different.
|
Junior Member
|
6. February 2008 @ 12:45 |
Link to this message
|
Hello, Sorry to butt in but any help would be great. Just got the box t, pre flashed with latest firmware. Problem is, when doing an autoscan, it's finding 'no programs'. I've been using this MMDS aeriel. (not sure if this picture will work), for the last couple of years, with an old jerrold box and can still pick up a couple of analog channels bbc, utv, etc. Have been reading the thread, and seen mentioned on occasion a down convertor. Will I need one of these for the box t?
Perhaps it is possible that I can only pick up analog signal, and not digital signal in my area, (East Co Clare)?
|
Junior Member
|
6. February 2008 @ 12:59 |
Link to this message
|
|
|
|
alec76
Junior Member
|
10. February 2008 @ 09:00 |
Link to this message
|
|
ok, i've got dvb-t module for my dm600pvr along with SatandCable aerial.
i am based 5-6 miles away from a transmitter .
this aerial NO GOOD for such distance!!!!
yep, i was able to scan transporders ( had to modified terrestrial.xml though) but signal is too weak. BER rate is just terrible-- no stable reception so far
gracem can you post few pictures of your modified AERIAL ?
WELL, i know this aerial is too bad, i wouldn't recommend to buy one of these , but at least i can use downconverter + powerinserter
This message has been edited since posting. Last time this message was edited on 10. February 2008 @ 09:11
|
|
Fano
Member
|
10. February 2008 @ 19:16 |
Link to this message
|
|
The yagis SatandCable are selling are obviously poor quality.
My neighbour has a good quality Yagi pointed at a transmitter 13 miles away and it has an snr of 99%,0 Ber on all channels.
For MMDS to work well you need clear line of sight to the transmitter .
Obstructions like trees and hills will affect reception.
If you are pointing at a beam bender the range wont be as good as a primary transmitter though .
|
|
claret08
Suspended due to non-functional email address
|
11. February 2008 @ 11:06 |
Link to this message
|
|
They work fine from SatandCable. Ive got a few mates in Co Cork that have had them, no problems, you just have to set them up correctly
|
|
alec76
Junior Member
|
11. February 2008 @ 17:51 |
Link to this message
|
|
Fano here is this aerial, any chance for the improvement?
bigger reflector or longer yagi etc.?
This message has been edited since posting. Last time this message was edited on 11. May 2008 @ 10:15
|
|
Fano
Member
|
11. February 2008 @ 19:25 |
Link to this message
|
Originally posted by alec76:
Fano here is this aerial, any chance for the improvement?
bigger reflector or longer yagi etc.?
The Yagi looks ok,its a 22 element version.
You cannot really add an extra length of rod to it .
The antenna gain can be approximated by counting the total number of elements and then using this formula: 10 log (number of elements). Example, a 22-element Yagi has an approximate gain of 13.4 dB.
If you are only 5-6 miles from the transmitter you should have a decent signal ,as I've said I've seen Yagis running at up to 15 miles from a transmitter,I havent tried further.
Are there trees blocking your line to the transmitter ?
How high are your snr levels ? Is the snr fluctuating ?
Make sure the rod is screwed well into the baseplate.
Perhaps you are too near the transmitter ,try just one rod element and see does this lower the ber.
I have seen very high ber levels if you are too near the transmitter and the signal overloads the yagi but that was < 2 mile range.
Hope this helps.
|
|
spongerob
Newbie
|
12. February 2008 @ 14:23 |
Link to this message
|
|
i reckon i'm about 6 or 7 miles from my local transmitter...should one of these yagi aerials work ok? Also where can i get a high quality one from?
I'm also wondering how important is line of sight with these aerials? Theres a few trees at the end of my garden which wouldn't be in the way if I put the aerial on the chimney, but to be honest I don't know if I'd feel comfortable climbing around on the roof of the house...wondering if it could work ok mounted on the side of the house?
Hoping to use the aerial with a dreambox if possible....any success stories?
Thanks folks
|
|
claret08
Suspended due to non-functional email address
|
13. February 2008 @ 11:43 |
Link to this message
|
|
The ones from satandcable work fine, if you are out of range for a yagi just get a normal mesh type one
|
|
norris21
Newbie
|
14. February 2008 @ 02:55 |
Link to this message
|
|
hi all i was wondering if anyone can help
i've been reading a lot of post but i still have a few questions
i live in south tipperary in the country side and am looking to get chourus
is there a way of getting a signal test done first before i go buying aerials. would it be easier to get chourus to install it.
if it passes a signal test which aerial do i need and what receiver box is the best. a lot of posts mention differnt ones for differnt systems
thanks for all your help in this matter
cheers
|
|
Advertisement
|
|
|
|
jock54
Junior Member
|
14. February 2008 @ 08:47 |
Link to this message
|
|
It will all depend on your location line of site to the transmitter. Good high gain aerial downconverter power supply, frobably best box to go for would be the dreambox 600t but you will need to install software into that when you get it, tricky enough to do if you haven't done it before. Sent you a pm with more details .
|
