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Question of the Day: Do you bet on sports?
Does iBurst sell 10m antenna cables?
- Thread starter limnos
- Start date
bdt
Executive Member
Heh, here's hoping this helps...
I'm not sure whether they do, but why put yourself through that pain when you can get one made up for you, quicker and probably cheaper[/QUOTE]
Oh HELL yes! (from this article) ..you see how LMR195 (the thin, nice to use stuff) loses signal at 3 TIMES the rate of LMR400? Now multiply that figure by 10m and see just how much of your precious signal you'll be farting away to the four winds
(hint: it really is better to use that nasty thick stuff for that kind of length)
marine1
Honorary Master
Get hold of Webb industries in Marlboro.
who.is.michael
Expert Member
You want the coaxial cable between your antenna and the UTD as short as possible. Rather buy 2 core flex and 20 meters of LAN cable…
Connect the coaxial cable directly to the pigtail and place the UTD in a waterproof PVC box and add some silicone to remove any moisture, ventilation holes at the bottom where the cables exit.
Have a look at the pic.
Regards
Michael
Connect the coaxial cable directly to the pigtail and place the UTD in a waterproof PVC box and add some silicone to remove any moisture, ventilation holes at the bottom where the cables exit.
Have a look at the pic.
Regards
Michael
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Hmm.... Sounds like a sweet plan! Where did u buy that PVC box that your utd modem is sealed in?
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Poynting1
Member
Omni vs directional antennas for iBurst
Quite right: the best solution is the modem as close as possible to the antenna for strongest RF signal. 10 m 195 cable not too bad at about 3 dB of loss if you do not have the patience for an outdoor solution. I personally like the nice directional antenna with the pic, but must caution users that where you have no direct line of sight you may find that a high gain omni directional antenna is a better solution since iBurst uses a so called MIMO type antenna array at the base station. This 12 element array can make use of multiple signals arriving from more than one direction. An omni is more likely to achieve multiple reflections and may in cases be better. It is also an advantage when iBurst perhaps puts up a base station which is closer and you will have immediate advantage whereas a directional antenna's beam may exclude signals from different base stations.
Quite right: the best solution is the modem as close as possible to the antenna for strongest RF signal. 10 m 195 cable not too bad at about 3 dB of loss if you do not have the patience for an outdoor solution. I personally like the nice directional antenna with the pic, but must caution users that where you have no direct line of sight you may find that a high gain omni directional antenna is a better solution since iBurst uses a so called MIMO type antenna array at the base station. This 12 element array can make use of multiple signals arriving from more than one direction. An omni is more likely to achieve multiple reflections and may in cases be better. It is also an advantage when iBurst perhaps puts up a base station which is closer and you will have immediate advantage whereas a directional antenna's beam may exclude signals from different base stations.
who.is.michael
Expert Member
Any decent electrical shop should be able to supply it, choose one with a slide lid ... While you there you might as well purchase two electrical connectors to extend the power supply unit's cable (best to keep it indoors as it releases quite a bit of heat when the UTD is in use) - test with a multi meter to ensure correct polarity!
Also, keep in mind that you want the least amount of connecters between the antenna and the UTD, with each additional connection more loss occurs.
Rgds
M
Also, keep in mind that you want the least amount of connecters between the antenna and the UTD, with each additional connection more loss occurs.
Rgds
M
who.is.michael
Expert Member
Nice going Poynting1, good to see your representation on the forum it is long overdue and appreciated!!!
I’m a big fan of your antennas as they deliver – one gripe – the best antenna tested so far is the grid, but no feed for the iBurst frequency?
Rgds
M
EDIT: "An omni is more likely to achieve multiple reflections and may in cases be better" – in theory this might be true, but practically it is the worst antenna to use with a stationary iBurst UTD as it causes base station “hopping” – I’ve had to remove quite a few of them to solve connection problems.
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Poynting1
Member
Grid Antenna for iBurst
I think it is possible to construct a feed for the Grid you showed for iBurst. Perhaps shall start a thread to see if others would be interested. iBurst will kill us - they like the omni's for reasons already mentioned.
Thank you for comments regarding directional vs omni performance. I almost feel like trying to solicit more comment in this regard to see what people are finding. We have our technical guru, Dr. Derek Nitch looking at the whole MIMO issue and he will be very interested in practical results where people have done comparisons. Especially same/similar gain omni versus directional. The hard core antenna guys at Poynting also simply cannot believe you can do better with an omni than a directional antenna, but theory on the other hand indicates it may be possible.
I think it is possible to construct a feed for the Grid you showed for iBurst. Perhaps shall start a thread to see if others would be interested. iBurst will kill us - they like the omni's for reasons already mentioned.
Thank you for comments regarding directional vs omni performance. I almost feel like trying to solicit more comment in this regard to see what people are finding. We have our technical guru, Dr. Derek Nitch looking at the whole MIMO issue and he will be very interested in practical results where people have done comparisons. Especially same/similar gain omni versus directional. The hard core antenna guys at Poynting also simply cannot believe you can do better with an omni than a directional antenna, but theory on the other hand indicates it may be possible.