Hi,

Have you any blueprint for 5GHz feeder to parabolic dish ? Any dimensions or your own construction ?

Thanks

from this topic :
http://forum.mikrotik.com/viewtopic.php ... 10#p137410

Try this:
http://yu1aw.ba-karlsruhe.de/3d_corn_refl_feed.pdf

it's working very well

O RLY ? What about corosion? Its sooo expoosed man.

now thats funny
what about stainles steel? Or galvanized steel?
read and stuff and after we can talk about corosion, and be aware, the feder is on the shore, salt water and stuff. read about that too.

How long did you have such a feeder with exposed copper parts on a production link, without touching it? How bad did the link paramters get over the years?

it's like the first day i've installed it...whats the deal? it will not rust.
Don't blame us because we make our own feeders, just go buy your stuff and leave us alone.
P.S. who said something about copper parts?
and btw, who will keep a link several years without changing stuff like radios?
get real...

Why do you need to change radio cards? New models with better parameters? Or old ones make problems in time? I have not heard of definite radio card aging problem, but I have heard of radio card defects problems...

Go ahead and make your own feeders man I can appreciate that! You crafted it, it works, that's cool! But my friend, those devices are measured with special equipment that costs thousands of dollars for "SWR - Standing Wave Ratio". Maybe this parameter changes over time, reflecting energy back to the card - could easily lead to a radio card performing worse and needing to be changed.

So please tell me how long have u run a link with such a feeder and not changed the feeder or not cleaned it or anything?

Nice design ... mainly for offset dishes where lots of manufacturers do coffe-can like under-iluminating dish surface or loosing signals/increasing bg noise due to spill-over.

But my friend, those devices are measured with special equipment that costs thousands of dollars for "SWR - Standing Wave Ratio". Maybe this parameter changes over time, reflecting energy back to the card - could easily lead to a radio card performing worse and needing to be changed.

IMHO after HFSS, CST, ADS and other structural simulators once you reach a good simulated model on one of them simply built as-is and it's done. Most of the time if you build using exactly the same materials you'd specified on simulations you reach predicted performance within +/-1dB (and all the other important parameters such as S11, irradiation diagrams, F/B ratio, whatever).

Up to 6 or 7GHz if you keep predicted dimentions within 0.05 ... 0.1mm (easy to measure even at home) and you have access to some simple tools for metal work most of the time you have those "mistery RF parts" pretty acceptable.

Of course a VNA and some other test tools are desireable but microwave structures, after simulators became accessible, turns in to a mechanical territory. And there's a lot of accessible test equip that can be arranged for band specific measurements. Example: I built my own swr bridges for 2.4 and 5.8GHz, the same for the power meters.

Inox, probes covered with a small radome etc solves most of the problems. C & X band LNAs most of the time have their RF probes exposed. Few of them have some sealed protection (except between probe and enclosure) and the plastic cap at the horn or scalar feeders always have some hole to avoid humidity condensing. This caps are there not because weather but to avoid insects and some small birds that loves built its home there

BTW, simulators x real world, this is my 2.4GHz sector antenna, 11.8dBi predicted, 11.5dBi measured. Lowest SWR occur at .3mm from the calculated distance between excited element and reflector. V & H -3dB BW 55 to 60º. Even if I did not take SWR measurements but keep accurate 'till .1mm it will be ok. Next step will be a flat pannel with 8 or 16 of them and a power splitter built on a Rogers 4003 or so.

Regards;

more

and a screenshot with the speed...if anyone is interested I can help with a contact adress of producer.

What is lighting equipment application ) ?

What is lighting equipment application ) ?

it just look nice

i believe i have 10 points for INOX.
nice. if motorola canopy works with sateliete dishes - i can't see why we can't just use our own creations.

my way is the othodox way