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2. AN/URM-25 signal generator - Wikipedia

   en.wikipedia.org/wiki/AN/URM-25_signal_generator

   The AN/URM-25 was part of a series of vacuum tube-based signal generators built for the U.S. military in the early Cold War-era.. Today they are collected and used by vintage amateur radio and antique radio enthusiasts who say they provide reasonably high accuracy and stability for a low cost, with build quality reflecting tough military construction requirements and standards.

3. Signal generator - Wikipedia

   en.wikipedia.org/wiki/Signal_generator

   In June 1928, the General Radio 403 was the first commercial signal generator ever marketed. It supported a frequency range of 500 Hz to 1.5 MHz. [2] Also, in April 1929, the first commercial frequency standard was marketed by General Radio with a frequency of 50 KHz.

4. Spark-gap transmitter - Wikipedia

   en.wikipedia.org/wiki/Spark-gap_transmitter

   The Alexanderson alternator transmitter, developed between 1906 and 1915 by Reginald Fessenden and Ernst Alexanderson, was a huge rotating alternating current generator driven by an electric motor at a high enough speed that it produced radio frequency current in the very low frequency range.

5. Outlawed anti-drone radio jammers are being marketed on ... - AOL

   www.aol.com/news/anti-drone-companies-market...

   Several online retailers and drone technology companies are marketing the sale of radio frequency jammers as drone deterrence or privacy tools, sidestepping federal laws that prohibit such devices ...

6. List of military electronics of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_military...

   Survival radio, operates in Very High Frequency (VHF) and Ultra high frequency (UHF) aircraft bands. Replaced by AN/PRC-149: AN/PRC-113: Portable Very High Frequency (VHF)/Ultra high frequency (UHF) AM combat radio transceiver: Magnavox: AN/PRC-117: Falcon® portable, tactical software-defined combat-net radio: Harris Corporation (now L3Harris ...

7. Alexanderson alternator - Wikipedia

   en.wikipedia.org/wiki/Alexanderson_alternator

   A large Alexanderson alternator might produce 500 kW of output radio-frequency energy and would be water- or oil-cooled. One such machine had 600 pole pairs in the stator winding, and the rotor was driven at 2170 RPM, for an output frequency near 21.7 kHz. To obtain higher frequencies, higher rotor speeds were required, up to 20,000 RPM.