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Author Topic: Helical Antennae: RHCP/LHCP  (Read 7752 times)

Mac Kerr

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Re: Helical Antennae: RHCP/LHCP
« Reply #30 on: March 07, 2016, 10:38:12 pm »

Deryl & I got to Wingdale last evening.

We got the big rib rack to eat and another to go. We made a start on the second one tonight.

Great BBQ.

Thanks for the pointer guys.

I hope you guys enjoyed it as much as I do! Glad you gave it a try.

Mac

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Rob Spence

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Re: Helical Antennae: RHCP/LHCP
« Reply #31 on: March 07, 2016, 10:41:33 pm »

I hope you guys enjoyed it as much as I do! Glad you gave it a try.

Mac

Definitely worth the drive. We were going home to Boston from NYC. It was not a big detour.

We will do it again.


Sent from my iPad using Tapatalk HD
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Keith Broughton

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Re: Helical Antennae: RHCP/LHCP
« Reply #32 on: April 14, 2016, 08:29:15 am »

When setting up a wireless link using a transmitter and receiver with two helicals facing each other, should both antennas be RHCP or should I be using a LHCP/RHCP pair?

I'm sure this is a simple question to someone who knows about these things, but I'm afraid what I know about RF engineering could be written on the back of a napkin. From what I've gleaned from model aeroplane forums it sounds like both antennas should be identical, and choosing the wrong combination can result in a 30dB loss in received signal, but I wanted to get the opinion of some people in the industry, as one company I work for uses a RHCP/LHCP pair for wireless audio links (to my mind this intuitively 'seems wrong' as the 'threads' won't 'wind on' to each-other, if you catch my drift).

This begs the questions, what is the practical difference between RHCP/LHCP, and why might a company have equal numbers of both types in their hire-stock?
Asked the Shure guy at an RF seminar and he said "same polarity" like the threaded rod mentioned earlier.
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Pete Erskine

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Re: Helical Antennae: RHCP/LHCP
« Reply #33 on: April 14, 2016, 10:49:07 am »

Asked the Shure guy at an RF seminar and he said "same polarity" like the threaded rod mentioned earlier.

Except if it is Metric.....
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Keith Broughton

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Re: Helical Antennae: RHCP/LHCP
« Reply #34 on: April 14, 2016, 11:09:33 am »

Except if it is Metric.....
Then you are really screwed  ;D
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Ike Zimbel

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Re: Helical Antennae: RHCP/LHCP
« Reply #35 on: April 14, 2016, 12:22:09 pm »

Asked the Shure guy at an RF seminar and he said "same polarity" like the threaded rod mentioned earlier.
That would be Tim Vear...
iz
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Jerome Malsack

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Re: Helical Antennae: RHCP/LHCP
« Reply #36 on: April 14, 2016, 01:44:01 pm »

Then you are really screwed  ;D

Can we use a Nail or Glue ?
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Russell Ault

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Re: Helical Antennae: RHCP/LHCP
« Reply #37 on: April 16, 2016, 03:11:14 pm »

Can we use a Nail or Glue ?

Glue will probably have less of an effect on the operating characteristics of the antenna (especially if it's metric glue)...

-Russ
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Doug Fowler

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Re: Helical BBQ: RHCP/LHCP
« Reply #38 on: April 16, 2016, 07:11:08 pm »

Ditto. Of course Big W is the new place for me, so you guys pick it.

LH vs. RH brisket is moot: The mouth is linearly polarized  :)

Probably true, but a correct brisket slice requires a 90 degree shift on one axis, and about a 30 degree shift on another.
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