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March 29, 2020, 07:27:34 19:27


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Author Topic: RF 10.7MHz emission lobe measurement  (Read 643 times)
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« on: March 17, 2020, 12:09:37 12:09 »

dear all, I need to measure the lobe of an 10.7Mhz tx antenna, directionality and signal, it consists of 9 coils wrapped in air, in front of it I've the rx antenna and near there are also other similar antennas.
I need to know if the antennas influence each other, the maximum reachable distance and directionality.
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Massimo
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bigtoy
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« Reply #1 on: March 19, 2020, 10:43:56 10:43 »

10.7 MHz has a wavelength of about 28 metres. It's going to be difficult to measure its radiation pattern, even outside in a large field, because of that. You can try, walking around the antenna with a handheld dipole and a battery operated spectrum analyzer, while the antenna is transmitting. The goal is to draw a line around the antenna that has a constant signal strength. Tough to do in the vertical plane however! You can try getting creative. It's probably a great deal easier simply to simulate it - there are EM simulation programs on this site.
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« Reply #2 on: March 20, 2020, 12:14:36 12:14 »

 Shocked

But my antenna is a coil in air of a diameter of 32mm with 9 spires, tx signal is a sinusoidal 5,5Vpp @10.7Mhz, unfortunatelly this is which the enginer has projected few yaer ago and I don't have way to contact him.
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token0
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« Reply #3 on: March 20, 2020, 09:42:16 21:42 »

You can try to simulate it in MMANA-GAL software http://gal-ana.de/basicmm/en/
It has free version for non-commercial use.
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