High Power Portable GPS (GPS L1/L2/L3/L4/L5) Jammer - Jammerall Co., Ltd
RA-50 GPS L1 Band GPS Signal Repeater with LNA [RA-50] - $89.98 : Mobile GPS Online - Geoidsoft Inc., GPS solutions - quality & effective - global service
Spread Spectrum and Code Modulation of L1 GPS Carrier | GEOG 862: GPS and GNSS for Geospatial Professionals
GPS Signal Plan - Navipedia
GPS signals - Wikipedia
Some observations of GPS L1 interference from terrestrial sources
First light: Broadcast of L1C by GPS III
GNSS inline amplifier | 12dB or 21dB gain | rugged waterproof construction