Sagetech is pleased to introduce a new transponder to be
released in the 4th quarter of 2010. Having designed the (then) world's
smallest Mode C transponder for the Insitu ScanEagle UAV, this new
design (XPST Mode S) is even smaller and uses less power.

The XPST-9509-01-1 is a full featured Mode-S Transponder certified for use in the US and Europe. It will also be offered in a Mode C variant. It features an integrated encoding altimeter, is smaller than a deck of playing cards, and consumes less than 3 watts of electrical power from a 10V to 35V DC supply. This device represents the state of the art in miniaturization and is well suited for applications where size and weight are critical, such as in small UAV's.

  • Includes an altitude encoding altimeter.
  • Supports ELS, EHS, and can be used as an ADS-B receiver via extended squitter.
  • Available with or without a control head (used in manned aircraft),
  • Suitable for use up to 15,000 feet.
I can't wait to get one for my FunJet !!!

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Mode C won't cut the mustard. I like the idea of having a virtual one, by retransmitting from the GCS position and Alt data taken from the UAS, that was a very smart idea from Earl.

I wonder how the CAA and FAA will handle the call sign coding.
The XPST-9509-01-1 is a Mode S transponder. The prior one, as used in the ScanEagle, was a Mode C.
Hi all,

I work for Sagetech Corp and I would like to make a couple corrections to the content on this page. I understand most of the article came from our website, which has been updated.

The transponder is Class 1, meaning it has no height restriction and can operate well above 15,000 feet. The only height limitation comes with the Altitude Encoder, which is only certified to 35,000 feet.

Also, this transponder is truely revolutionary because it is offered in the Mode S (the next generation of transponders) variant.

Attached is a file that contains the full info product for the transponder.
This thing is amazing! I missed this when it was originally posted. I was wondering when someone would make an ADS-B transponder for UAVs. Tyler, any plans on incorporating ADS-B In?

Gary, mode S turned out to be just another experiment and is doomed to obsolescence - Cossor/Condor is not supplying it with their BI-6's anymore except to some third world end users - it is not compatible w/HOST and will whither on the vine until ADS-B fully implements! It is actually already starting to be decomm'd from some long range and beacon only sites.
Unfortunately a TSO'd XPDR is dead weight w/out a Type Certificated airframe to fly it in and you shouldn't be anywhere near enough to manned aircraft to make it useable w/TCAS!!
I agree with you as far as the regulations go right now, but the reason I am excited about this is because I think this is the technology that will enable UAVs to play in the NAS. We are at least 10 years away from that, but I am glad to see the hardware is in development.

The technology is already here, that is not the problem (and I can't go into that part any further). I posted a link a while back for Raytheon's Cobra, a low cost type certificated UAS available now. It got censored immediately by the EYE IN THE SKY even though it was clearly marked UNCLASSIFIED approved for public release. Check it out, but you'll have to find it yourself (keep digging, it's not on the surface)!
See attached document in earlier post
Er, you mean like the first hit that Google gives for "Raytheon Cobra UAV"?
No, that's the teaser - the original post of that still exists - try again!!

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