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clanon
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Posts posted by clanon
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is a great design you can USE the length you want , taking directors OUT from the TIP back (reducing GAIN)
the BALUN losses and bandwidth is of most importance
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so far i'm using
Boom 15x15 square (1mm)
tubing 8mm (1mm thick)
DIPOLE 15 x 2 mm
12dbi could be achieve with 7 + 3 elements BANDWIDTH is the hard thing to achieve (More than 50mhz)
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This channels ? more or less...KANALs ...? if only TWO channels we need TWO dipoles if ALL channels only one dipole
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it promise more than 10 dbi (still working on it)
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How many elements...GAIN...? do you need
and WHICH KANAL ?
what tubes do you have?
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from 690 to 770 you could use a NORMAL tube dipole NOT FOLDED but TUNING the TUBE's diameter
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BALUN 1:1 if 50 ohms...needed (otherwise rf runs trough coax shield and resonance effects occur over cable shield)
Pawsey stub (3cms) INNER CONDUCTOR NOT CONNECTED! QUARTER WAVE to FR center
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mobe pics to https://www.wifi-antennas.com/topic/1762-no-name-antenna-27-dbi/?page=2...i think
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GREAT WORK JOMY!
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learn that...(the hard way)
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if you want more GAIN , new shape and area should be SIMULATED to see it doesn't harm the original specs...VSWR , Impedance , diagram (lobes) bandwidth ,etc
Flat area plates are the safest to use
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Any FLAT plate are would do...the bigger the BETTER.
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Is it MiMo the dongle...? Two antennas...
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It depends on the DISH , F/D ratio . offset or center feed...?
you'll be trying to achieve 70% efficiency (illumination) or more if possible.
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Vivaldi is OK ABOVE 1ghz...
not much GAIN tho, and it SUCKS under 1ghz...we must try and reconsider...JOMY might have a UWB design...CONE and DISC...
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i think is 25Mhz to 1.7ghz...
and the LF is below that , any wire antenna would do there...
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if you have two connectors...do you know the frecuencies EACH connector covers...
Is the whole bandwidth 100khz to 1.7 ghz...? (or more)
divided into TWO antennas...
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I'll try that VIVALDI on FR4 i'll tell later how it went
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Can you burn your own PCB...?
we could dig up some design...
in HF, VHF and UHF
Posted · Edited by clanon
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)