clanon

almost NO GAIN

http://www.prc68.com/I/AgilentE4404B.shtml

and ALL of them LIE on the GRAPHs...

under 5 dbi GAIN mostly 

check it out:

EX03B_RFSpace-UWB1_Excel-Summary.xlsx

over 100 us$ FOR NOTHING...fucktards buy stuff for their LOOKS! lmao

https://antennatestlab.com/antenna-examples/example-3-vivaldi-antennas-rfspace

this is the MOST EXPENSIVE vivaldi out there...and it SUCKS under 1000MHZ...

I was tryin to change that...did my research...Build some antennas after MONTHS of simulations...still do...

LPDA is the BEST for uwb with a DIRECTIVITY (7 dbi without reflector 12-15 with reflector) CAN't beat that

BUT it's hard to build...

52 minutes ago, jbckdsav said:

Vivaldi have no gain? Please.

Who told you this? 

under 1000 mhz that is...3 4 dbi

They get gain over 1ghz 

YES it is complicated...but the results are REALLY GOOD

The Vivaldis have NO GAIN...(THIS have 7dbi or more over the WHOLE BAND)

Thinking in cutting copper tape by hand ... after printing the dwg dxf 1:1 blueprints...

CAN NOT be made in PCB board (distance between HALFs are changing gradually from back to balun)

making it on pcb board would get you HUGE variations on Impedance over the whole band...

Make some modifications, distance parallelism has been CURVED to allow for a soft Impidance curve...

6-7 dbi gain from 300 Mhz to 6000 mhz

best response is between 1 ghz and 4 ghz...

looks good to me

SDR is the intended use...

Still testing , Imepdance needs some work still...But looks good so far)

Copper tape under 40 cm long and wide...PES foam or PU foam dielectric

17 hours ago, Alonso said:

Thanks. Estoy planeando captar señales de la ionósfera (I'm planning to capture signals from the ionosphere).

12.3 inch long x 1.02 inch diameter ferrite rod core for maximum reception

31 cms x 2.6 cms

OLD AM radio variable cap

i'll try in the next days and post if GOOD..,.

Loop antenna (antena de Lazo) should be straight away design in CST...

Lots of WIRE wounds and a Port at the ends...

10-30khz...i'll give it a TRY in CST LOTS of wire for that LOW...

Alonso para que uso la vas a usar...(What use you're planning for this...?)

https://stormwise.com/page28-VLF.htm

On 28/8/2023 at 6:00 AM, Chenobix said:

How much sections it needs to have 10dbi or better 15dbi ? Please, can help me with more details and appliable design? ??

Thank you for reply.

Without a reflector (Omnidirectional) you'll need 1 meter and some to get close to 15dbi (15-20 half waves) 

With reflector you could have 15dbi at under One meter...

Insulators , supports should be on the middle of ANY half wave dipole (ti minimize losses and mismatches)

2,1 mts diameter , i assume

something is OFF , i think it is SPILLING signal OUTSIDE the dish , maybe with some wall side box...or a RIM...

8 hours ago, Admin said:

,,,how "half of the Dipol, remove 3 directors and make the tube through the boom"...???

MOVE ALL  up FRONT (directors) Extend Boom tube to allow extra length

18dbi

OKAY , just talking about THIS (more info)

Distances to FIRST director and to REFLECTOR MUST be reviewed!

CAN't OPEN it ( NEWER version)

what happens if the FOLDED dipole is HORIZONTAL ?

INTEGRAL is FAST , BUT you have to check accuracy

tHE ONLY ONE THAT WORKED ON 1,26 MTS DISH

21 hours ago, Harry36 said:

 

results in FD differ by 100MHz...

 

ALWAYS FD solver shows a SHIFT in RESONANCE center and POORER S11...(but it is RECOMMENDED for WIRES)

The original FEED is for a 6' 7' 1,8mts 2.1 mts diameter GRILL

Parabolic Antenna F/d ratio is important (te indica el tipo de iluminación necesaria par eficiencia mayor a: digamos 70 % , que es lo que se busca como objetivo)

Having the original feed wouldn't be better to copy the original GRILL

more info

Harry HOW can i put the settings from 1 ? on VSWR...is from zero default