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Questions tagged [circular-polarization]

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2
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1answer
35 views

How to use 70 cm WiMo phasing harness for a COTS crossed yagi antenna?

In order to generate circular polarization in a crossed-yagi, a 90° phase delay is required between the horizontal and the vertical antenna. In practice, this is achieved either by making a mechanical ...
4
votes
2answers
332 views

Does a parabolic reflector dish change circular polarity?

I've been receiving satellite signals in the L-band (~1.7GHz), recently. These signals are RHCP. So far, I've been using a DIY helical antenna in axial mode, and a patch antenna with cropped or ...
2
votes
1answer
59 views

Why is it claimed that circular polarized RF has better penetration properties compared to linear polarized RF?

It is claimed in blogs and other unverified internet sources that circular polarized RF signals are better for penetrating structures, such as walls. An example here, there are many others when you ...
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3answers
200 views

Would the antenna described work?

For reception of amateur radio satellites, turnstile antennas (consisting of two crossed dipoles fed out-of-phase) are often used. I've recently had an idea - what if two half-wavelength dipoles are ...
1
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1answer
534 views

VHF / UHF - Terrestrial Circular Polarized Antenna

I've been doing mostly HF for the last 20 years and just recently installed a 2m/70cm mobile rig in my shack for base station work. I like to work FM simplex and repeaters when the HF bands are not ...
6
votes
1answer
240 views

How to stack circular polarised antennas

I'm interested in stacking a pair of circularly polarized "crosshair" antennas. Do I construct such as both antennas are in phase with one another then match the two signals in phase via the coax line,...
3
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2answers
724 views

What is Circular Polarization?

So I just learned that a satellite does not send out a circularly polarized signal, it just switches orientation slowly when it topples through space. I thought that because they were spinning, the ...
7
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2answers
2k views

Are satellites Left or Right hand circularly polarized?

I'm thinking of building some helical antennas for satellite work. I want to know which way to wind them. If satellites are spinning randomly, how can we know if they are left hand or right hand ...
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2answers
120 views

Will swapping receiver polarity on a spiral antenna change right hand to left hand polarization?

I'm evaluating a helix antenna, and wanted to try out a reverse circular polarization than it's designed for. I do know that it's balanced and has no other components that would preclude polarity ...