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clanon
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Everything posted by clanon
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nice to try for an ARRAY...4 - 8 of those
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if you choose parabolic dish reflector you'll need any good TWO PORTS feed for that dish (mimo 2Tx2Rx REQUIRES two cables , two antennas or one at 90 degrees between two ports) to get FULL SPEED it maight work okay with just ONE cable-port but NOT FULL SPEED (depends on HOW it was configured , firmware settings)
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Those are 2T2R (mimo) they NEED both antennas to make FULL use of BANDWIDTH sensitivity is better on the 841 (need less gain and power).... Link budget calculates at least 18 dbi gain needed for 17 18 dbm of power and -68dbm sensitivity...
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Line of SIGHT or OBSTACLES , if so , what kind of obstacles , Height you could use , mastil tower... Radio types (router extender power , sensibility) THEN and only then , you know how much gain you'll need...imho
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Jomy try making it a LFA , doing an HORIZONTAL folded dipole , you can make it 50 ohms by that change and dimensions , the rest stays the same (director reflectors)
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wire is SO reactive...
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it should be studied and simulated , since impedance 200 ohms (originally) will be 100 ohms for two ...but 4 of those would make a direct adaptation to 50 ohms (1:1 balun required) and YES
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shabra , what swarg is saying (i think) is that you should MAKE sure that the base of the MED sees a GND (center of grid) at the SAME point like in the BASE station (telecom antenna) which means HOLDING it from OUTSIDE and BEHIND with the circle (director) pointing in to the GRID... And that the lobe of this MED is FAT and goes in two directions (polarizations) meaning that you are spilling some radiation since your reflector (grid) is almost rectangular (Circular would be better to reflect both dipoles) which are at 90 degrees
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HEY JOMY did he say THANKZ or named you...?
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if TOLERANCES (diameters on shield , leads , PCBs) are not maintained , impedance would change. I would solder straight from modem , card to antenna , if possible. Keeping distances as short as possible and impedance (cable shape ,curves) as minimum as possible. ALL connectors have loses imho
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HUMIDITY and MOISTURE inside COAXIAL cable could be a problem...there. over time. a layer of some insulation or cover all in thin PET (nylon) dielectric paint could be better... Cable changes inside due to WATER and you lose SIGNAL
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DISTANCE to REFLECTOR must be TAILORED to local needs...(FR4 quality . reflector enclosure sizes and shapes) but it's on ballpark...i think
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focus point is important (distance to reflector) some mm make a huge difference... did you try with antenna (reflector ) at 90 degrees...VERTICAL...?
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i catched Mikrotik stealing BUT developing over the theft here
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easier to STEAL than develop-invent... nice bandwidth... could it be SHIFTED to 1 ghz (LTE)...? Who needs 3,5ghz...
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That TRENDNET is easier to build and simulate... wouldn't be GREAT to develop an ARRAY bi-band using dipoles...? (15 or more dbi)
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Couldn't find any...(searching , i'm trying) Working on IMPEDANCE adapting...
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SQUARE works too (aluminum plate RIVETED)...leave at least 1 cm to dipole borders...(my GUESS)
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The DIAMETER of the container ...is too small (dipoles are leaning-contact with container) apparently...(Which would give a jumping signal as it is seen , high and low swr , s11, impedance and changing diagram of radiation)
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700mm the one i'm working on...i'll tell you if it works all 8 mm tubes and double flat strip 15x2mm folded dipole and balun included (just put the cable tv in the antenna STRAIGHT)