[amsat-bb] Re: LHCP or RHCP?

Mark L. Hammond marklhammond at gmail.com
Wed Oct 6 11:13:23 PDT 2010

Hi Tom,

Is your question:

How do you determine the resulting polarity of the anteanna?

    My response:  when standing at the rear, does the cork-screw go
clockwise or counter-clockwise as it spirals away from you?  That is
the visible difference, if building a helix.


Which polarity should I build?

            Here's my take--if you can't do both polarities and
switch, you may be better of going linear.   But if you have to build
circular, you are probably better off with RHCP if you work 435.300 on
AO-51 a good deal...

Keep in mind that 435.150 is LHCP--so when we run QRP or JOTA mode
this month, you fixed RHCP folks are going to see what I mean....


Mark N8MH

On Tue, Oct 5, 2010 at 7:23 PM, Tom <k0tw at cox.net> wrote:
> On the premise that the only dumb question is the one that goes unasked,
> here goes.
> If I'm building an antenna of circular polarization for use with the birds
> what determines if it should be LHCP or RHCP? I've read the ARRL Satellite
> Handbook and "sort of" searched the AMSAT-BB archives but found nothing
> about this question.
> Thanks.
> Tom - K0TW
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Mark L. Hammond [N8MH]

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