[time-nuts] Time security query
Mark Sims
holrum at hotmail.com
Tue Aug 25 19:28:35 UTC 2009
I had a GPS receiver and a pair of small 315 MHz transmitter and receiver modules that I wanted to fly in a rocket. I knew the data link was good to around 1/2 mile at 2400 bits/sec.
I wired up the units, installed them in the rocket payload section, took it outside, switched it on, and never got a GPS lock. Hmmm... GPS L1=1575 MHz, 315x5=1575 MHz... could it be? A little more testing showed that that little 315 MHz transmitter module would jam every GPS within over a 1/2 mile radius.
And for some strange reason, that module disappeared from the manufacturers catalog and all their distributors. It was replaced with a 310 MHz system (and they even denied that they ever built a 315 MHz version).
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