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2. Antenna analyzer - Wikipedia

   en.wikipedia.org/wiki/Antenna_analyzer

   An antenna analyzer measuring SWR and complex impedance of a dummy load. MFJ-269, MFJ Enterprises Inc. An antenna analyzer or in British aerial analyser (also known as a noise bridge, RX bridge, SWR analyzer, or RF analyzer) is a device used for measuring the input impedance of antenna systems in radio electronics applications.

3. Fldigi - Wikipedia

   en.wikipedia.org/wiki/Fldigi

   Fldigi (short for Fast light digital) [4] is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem.The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively.

4. Lafayette Radio Electronics - Wikipedia

   en.wikipedia.org/wiki/Lafayette_Radio_Electronics

   "Wholesale Radio Service" was established in the early 1920s by Abraham Pletman in New York City. Radios sold by the company were trademarked “Lafayette” in July 1931. Following a Federal Trade Commission action in 1935, Wholesale Radio Service became "Radio Wire Television, Inc.". A 1939 company catalog bore the names Radio Wire Television ...

5. Vintage amateur radio - Wikipedia

   en.wikipedia.org/wiki/Vintage_amateur_radio

   Such operating events are not traditional ham radio contests inasmuch as they are a night of friendly QSO’s using home-built, restored commercial ham, broadcast or military equipment. [20] The Antique Radio Club of Illinois operates a vintage radio station as a public demonstration at the Antique RadioFest allowing licensed amateurs who visit ...

6. Low Frequency Analyzer and Recorder - Wikipedia

   en.wikipedia.org/wiki/Low_Frequency_Analyzer_and...

   A working model of the Low Frequency Analyzer and Recorder was delivered in May 1951 which operated with real time analysis of a frequency band of 1 to 1/2 Hz. Along with the working model was a proposal for hydrophones, cables, processing systems and beamforming so that a hydrophone array could present multiple azimuthal beams to be displayed.

7. Radiotelephony procedure - Wikipedia

   en.wikipedia.org/wiki/Radiotelephony_procedure

   Similarly, the U.S. military radio procedures recommend headsets with noise-cancelling microphones: Use of Audio Equipment. In many situations, particularly in noisy or difficult conditions, the use of headsets fitted with a noise cancelling microphone is preferable to loudspeakers as a headset will aid concentration and the audibility of the ...

8. Signal strength and readability report - Wikipedia

   en.wikipedia.org/wiki/Signal_strength_and...

   A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their radio station equipment. These report ...

9. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .