Maybe you can hear them taking off? -John
============= > Hi > > Hard to detect looking horizontally, pretty easy looking straight up (or > straight down from above it). > > Bob > > > On Dec 15, 2011, at 7:14 PM, gary wrote: > >> Kandahar has proven poor opsec since the thing was photographed! I don't >> know about the base in Baluchistan. >> >> But even knowing the launch doesn't mean they know when it is on target. >> Supposedly the UAS is stealthy, so it would be hard to detect. >> >> >> On 12/15/2011 4:00 PM, J. Forster wrote: >>> KISS guys. >>> >>> Suppose the Iranians had one of their buddies watching the drone base. >>> When they saw a drone take off, the guy just called a contact by cell >>> and >>> the Iranians turned on a wide coverage jammer somewhere along the >>> flight >>> path. >>> >>>> From previous incidents and observations, if the drone came into the >>> jammed area, it'd lose GPS lock, orbit, and run out of gas and crash. >>> They >>> could easily select a jammer site that was good for recovery. >>> >>> FWIW, >>> >>> -John >>> >>> ================ >>> >>> >>> >>>> Hi, >>>> >>>>> Of course, but then when you switch on your transmitter you are on >>>>> your >>>>> own. Considering the speed of a drone (700Km/h?) you need a great >>>>> coverage, so much RF power out. >>>> >>>> Easy: Use a dish antenna on the transmitter. >>>> Very directional with large ampification. >>>> If using a 'moderate' opening angle, just pointing the dish at the >>>> drone >>>> by hand will work. >>>> After starting the system locked to the gps time, once the signal is >>>> on >>>> the drone, >>>> I don't think it matters anymore. (It might not even matter at the >>>> start?) >>>> The drone will follow the timing of the jammer. >>>> As the drone will receive all signals from the single transmitter, the >>>> relative timing will be fixed. >>>> Just using a OCXO will have a good enough short time stability to >>>> allow >>>> the system to work, I would think. >>>> As the plan is to land or jam the drone within say 10 minutes, long >>>> term >>>> stability is not that important... >>>> >>>> Greetings, >>>> Pieter. >>>>> >>>>> On Fri, Dec 16, 2011 at 12:22 AM, J. Forster<[email protected]> wrote: >>>>> >>>>>> >>>>>> >>>>>> You could just have a GPS receiver and use that to sync up the >>>>>> jammer. >>>>>> >>>>>> -John >>>>>> >>>>>> ============== >>>>>> >>>>>> >>>>>>> >>>>>>> To transmit a GPS cluster signal you need a GPS simulator to >>>>>>> generate >>>>>>> the cluster so even a single transmitter can do this, the relative >>>>>>> timing and not the different positions of the transmitters is what >>>>>> the >>>>>>> receiver sees. >>>>>>> >>>>>>> When over-powering the real birds you just needs to be close enough >>>>>> in >>>>>>> timing, and it is the location of the target which is of interest. >>>>>>> >>>>>>> If this scenario is true... then they have not done their >>>>>>> home-work. >>>>>> I >>>>>>> would ask a number of critical questions already from my civilian >>>>>>> background. >>>>>>> >>>>>>> Cheers, >>>>>>> Magnus >>>>>>> >>>>>>> _______________________________________________ >>>>>>> time-nuts mailing list -- [email protected] >>>>>>> To unsubscribe, go to >>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>>> and follow the instructions there. >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- [email protected] >>>>>> To unsubscribe, go to >>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>> and follow the instructions there. >>>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
