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clanon
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Everything posted by clanon
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SLOT half wavelength radiator...? It would be nice to put 4 or more and feed it with a PROBE...
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Styrofoam is the most TRANSPARENT material (almost no effect on Resonance) , but thin PET is good too...Silicone sealer are NOT recommended (high losses)
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if there's movement (wind , manipulation , vibrations) you might experiment ups and downs in signal strength (VSWR , Mismatch impedance, resonance , etc) As long the CONTACT is good , all ok.
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what i've notice in the SIMs is that every time you add metal Frecuency of Resonance goes up , a little...you might try to take that into account PS: is that a SIGN or a LICENSE PLATE...?
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around 10 dbi if the signal is in the same POLARIZATION...3 db less if lineal source... Jomy should try and make it smaller with the meanders in the circle... 3/8 pipe (9.5mm) refrigerator tubes...
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Quadix.nec
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simlations
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the diameter would decrease....but to get more than 10 db it should take more than 2 meters....i think...
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YUP! i picked stations (VHF TV RADIO) from Chile (1000km or more ) by refraction that way with the helical monster...and some other antennas...with lots of FADING and it doesn't last long... HEIGHT above GROUND is of utmost importance beyond 200kms... PS: it will be useful to know the POLARIZATION on the TX...
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You SHOULD PLAY with the reflector distances around 2 centimetres (19 mm right now) , more or less some millimetres (to allow for PCB differences in material) Closer more gain and vswr ...farther less vswr and gain (there MUST be a SWEET SPOT there) THIS is for FR4 4.3 dielectric constant (permeability) 1 millimetre (thickness) or less Quad .dxf Quad gerber file.gbr quad.cst
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working on the RHOMBOID right now...hard to DRAW that shit...
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you didn't answer about material availability...sizes...
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details
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This should work UKW 14 Elemente, DDR-Ausführung.maa
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the CODE was on site UKW 14 Elemente, DDR-Ausführung.maa.txt i'm gonna work on the RHOMBIC...27dbi , more on my alley for dx...
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I always wanted to try a crossed dipoles (circular-elliptical) polarized array... Most of the signals are Vertical on old equipment (around here) and quasi CP on the new stations...theory
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Other FM mmana files (german) we could try something .."new" ..what tubes are you planning to use... and boom dimensions... hard to get close to 14-15 dbi without a big area reflector...
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nice...I did some 400km 500km dx back in the 90's ...but i have a cement glass fiber roof W (dielectric until rain) over which i put 2 x 30 mts helical wire , feed at the middle with 300 ohms cable over or close to 15 dbi i guess...to mi advantage the roof was aligned with the big cities... stations piled up and kick each other out...(yamaha fm receiver good selectivity and sensitivity)
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Reception...? UNIdireccional Omnidirectional indoors outdoors...?
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JOMY...! HOW do i LOWER the VSWR... antenna is GREAT but too INDUCTIVE REACTIVE... too NARROW BAND... distance to reflector change NO GOOD distance to feed network NO GOOD
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NON PERIODIC ( non resonant ) CABLE lengths shouldn't be a problem (only for signal loss , bad connectors, too long , bad quality losses) it's just an interaction between the VNA hardware and the cable...i think... CORRECT ME if i'm wrong.
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if I build it (which i WON't) I would pass the cable STRAIGHT ( NO angles ) from the reflector's CENTER and solder it from BEHIND...(but that's just me) need to simulate to confirm...Like i did on the parabolic feed...of course you need to fix the reflector without the bolt in the middle or make it HOLLOW
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send ONE bitcoin my way...and we're EVEN! HOPE you BUILD it and tell how it goes!