I need someone interested in adding quadrature 2 meter antennas to the outside of a 10" diameter sounding rocket by middle May...
This launch is going to space (100 miles up) from White Sands on a sounding rocket to then come back down by parachute. Antennas cannot stick out far (maybe an inch?) but can be bent back along the surface. Temperatures will approach 800F during the 10 minute flight. G' forces will be huge.
The payload will be (what else) an APRS trackign system and 2-way APRS communications transponder.
So, if anyone wants to take on this antenna, lemme know. All I need is the detail design and analysis. The machining is paid-for. Oh, it also needs quadrature GPS antennas, but that can just be a pair of 1.5" monopoles...
Bob, WB4APR
Go bob
nick
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga Sent: Tuesday, March 30, 2010 6:04 PM To: amsat-bb@amsat.org Cc: 'TAPR APRS Mailing List' Subject: [amsat-bb] New APRS Rocket Antenna concept needed
I need someone interested in adding quadrature 2 meter antennas to the outside of a 10" diameter sounding rocket by middle May...
This launch is going to space (100 miles up) from White Sands on a sounding rocket to then come back down by parachute. Antennas cannot stick out far (maybe an inch?) but can be bent back along the surface. Temperatures will approach 800F during the 10 minute flight. G' forces will be huge.
The payload will be (what else) an APRS trackign system and 2-way APRS communications transponder.
So, if anyone wants to take on this antenna, lemme know. All I need is the detail design and analysis. The machining is paid-for. Oh, it also needs quadrature GPS antennas, but that can just be a pair of 1.5" monopoles...
Bob, WB4APR
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On Tue, 2010-03-30 at 19:04 -0400, Robert Bruninga wrote:
I need someone interested in adding quadrature 2 meter antennas to the outside of a 10" diameter sounding rocket by middle May...
There was an article in a recent copy of Practical Wireless about making a DDRR antenna for 2m out of the ring around the top of a catering-size coffee can. It's not quadrature as such, but I wonder if you could fit such a thing inside the body of the rocket looking down, with its ground plane acting as the bulkhead for the nose cone?
Gordon MM0YEQ
Bob,
how about an Alford Slot antenna? http://www.k5rmg.org/Alford-slot.html
one for 2 meters is almost perfect in size for a 10" diameter tube!
Joe WB9SBD
The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com
On 4/2/2010 1:28 AM, Gordon JC Pearce wrote:
On Tue, 2010-03-30 at 19:04 -0400, Robert Bruninga wrote:
I need someone interested in adding quadrature 2 meter antennas to the outside of a 10" diameter sounding rocket by middle May...
There was an article in a recent copy of Practical Wireless about making a DDRR antenna for 2m out of the ring around the top of a catering-size coffee can. It's not quadrature as such, but I wonder if you could fit such a thing inside the body of the rocket looking down, with its ground plane acting as the bulkhead for the nose cone?
Gordon MM0YEQ
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 (4)
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Gordon JC Pearce -
Idle-Tyme -
Nick Pugh K5QXJ -
Robert Bruninga