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
K6CDW
IIRC, the default (unpowered) was RHCP. Somewhere I have the manual for that antenna (I have one), and if I can find it, I'll check. 73, es Happy Thanksgiving! Jim KQ6EA
--- On Wed, 11/25/09, David Wing david@cdwing.com wrote:
From: David Wing david@cdwing.com Subject: [amsat-bb] Polarity Switch Question To: "'AMSAT-BB'" amsat-bb@amsat.org Date: Wednesday, November 25, 2009, 12:15 PM 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
K6CDW
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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
73
Graham G3VZV
----- Original Message ----- From: "David Wing" david@cdwing.com To: "'AMSAT-BB'" amsat-bb@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
K6CDW
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (3)
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David Wing -
Graham Shirville -
Jim Jerzycke