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Edel2020

antenna for FM radio 88 - 108

44 posts in this topic
6 hours ago, Admin said:

the diameter would decrease....but to get more than 10 db it should take more than 2 meters....i think...

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,,, I don't know,  have to try ... !!

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Someone who models this antenna for please ...... no idea of the measurements, they have told me that it is very good but I have never been able to get measurements

quadix.jpeg.7967f85bc34ed539cb92f44a7140fe95.jpeg

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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...

ARISS-McQueen-1.jpg

Edited by clanon
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,,, so I think it is the most suitable, I will try to do a simulation...!!!

unnamed.png

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If that works it would be very good, it has a good size, how did the simulation turn out?

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simulate this ... but try to give a more contained size and run the frequency towards 98 Mhz and not the 105 Mhz in which the band is centered in this antenna

ZL.gif

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Edel, but this antenna is over 4 meters length...!!!

,,, the antenna according to my sketch above, is better(75 Ohm impedance)...!!!

screenshot_812.png

antenna elements = 16x2 mm aluminum pipe
adaptation line = copper wire 3mm diameter

screenshot_813.png

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:D:DYou're right, it's big, it was just to test if it could be made smaller and keep the gain high, maybe with a bigger reflector, you are the specialist, thank you very much

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Please someone who uploads the scheme of a good RF amplifier for this band that is well tested

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Hello greetings to all ... continued with the subject to not let it cool I found this antenna produced only in the old GRANIA Germany in the 70s and 80s, great gain but very badly distributed throughout the bandwidth we use today (88-108) in those times and in that F / r.

 

14.gif

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Posted (edited)

The bad thing about this antenna is the F / R, how could it be improved?

 

We could take the design of the active element used by Brian Beezley Author of the Site http://ham-radio.com/k6sti/index.html in your Metric Yagis to improve it?

10el_loopfeed_k6sti_sm.jpg

20200208_105808.jpg

Can someone model it and share the changes?

ukw2gj0ydpxlnu.jpg

Edited by Edel2020
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