[amsat-bb] Re: Polarity Switch Question

Graham Shirville g.shirville at btinternet.com
Wed Nov 25 12:52:53 PST 2009

Hi David,

AO51 435.150MHz transmitter is LHCP
AO51 435.300MHz transmitter is RHCP

although there will be occasional fades during a pass and sometimes the two 
TXs are not providing identical RF levels, the difference should be quite 
great and enough to determine which way round the switch works!

good luck


Graham G3VZV

----- Original Message ----- 
From: "David Wing" <david at cdwing.com>
To: "'AMSAT-BB'" <amsat-bb at amsat.org>
Sent: Wednesday, November 25, 2009 8:15 PM
Subject: [amsat-bb] Polarity Switch Question

> Getting really close to having everything installed and working on the 
> roof!
> May get to work some birds later today if the XYL doesn't corner me with
> housekeeping chores in preparation for tomorrow.
> One of the antennas that I'm putting up is an old Cushcraft 30 element 440
> with a polarity switch.  I have not been able to find any documentation on
> this antenna and I wonder if there is an easy way to determine if the
> antenna is set up for RHCP or LHCP.  Clearly feeding 12v to the switch 
> will
> change the polarity but I'm wondering if there is an easy way to determine
> what the default setting is before the switch is energized.
> 73, David
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