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2. Automatic direction finder - Wikipedia

   en.wikipedia.org/wiki/Radio-magnetic_indicator

   The operator tunes the ADF receiver to the correct frequency and verifies the identity of the beacon by listening to the Morse code signal transmitted by the NDB. [5] On marine ADF receivers, the motorized ferrite-bar antenna atop the unit (or remotely mounted on the masthead) would rotate and lock when reaching the null of the desired station.

3. Directional antenna - Wikipedia

   en.wikipedia.org/wiki/Directional_antenna

   Patch antenna gain pattern. A directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions. Directional antennas can radiate radio waves in beams, when greater concentration of radiation in a certain direction is desired, or in receiving antennas receive radio waves from one specific direction only.

4. Doppler radio direction finding - Wikipedia

   en.wikipedia.org/wiki/Doppler_radio_direction...

   Early radio direction finding (RDF) solutions used highly directional antennas with sharp "nulls" in the reception pattern. [2] The operator rotated the antenna, looking for points where the signal either reached a maximum or, more commonly, suddenly disappeared or 'nulled'.

5. Direction finding - Wikipedia

   en.wikipedia.org/wiki/Direction_finding

   However, the klystron was quite unsuitable as it was a narrow-band device and extremely noisy [21]: 392 and the TWT, although potentially more suitable, [21]: 548 has poor matching characteristics and large bulk, which made it unsuitable for multi-channel systems using a preamplifier per antenna. However, a system has been demonstrated, in ...

6. Adcock antenna - Wikipedia

   en.wikipedia.org/wiki/Adcock_antenna

   The Adcock antenna is an antenna array consisting of four equidistant vertical elements which can be used to transmit or receive directional radio waves. The Adcock array was invented and patented by British engineer Frank Adcock and since his August 1919 British Patent No. 130,490, the 'Adcock Aerial' has been used for a variety of ...

7. WSUN (AM) - Wikipedia

   en.wikipedia.org/wiki/WSUN_(AM)

   The directional antenna installation, the first in the United States, consisting of two 200-foot (61 m) towers, was successful. [8] As an example of its effectiveness, engineer Wilmotte noted that at one point a telegram was sent from regulators in Washington asking why WFLA-WSUN was off the air, because an inspector located in Atlanta was not ...

8. WTAG - Wikipedia

   en.wikipedia.org/wiki/WTAG

   A farm on Shrewsbury Street in Holden, about 5 miles (8.0 km) north of the center of Worcester, was purchased in 1934. Construction of a new transmitting facility was begun in 1935. On February 2, 1937, WTAG began transmitting with a power of 1000 watts using a three tower directional antenna system. This transmitter site has been in continuous ...

9. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   This article provides a summary description of many of the different antenna types used for radio receiving or transmitting systems. This summary article collects groups of antennas based on their electrical operation. The classification and sub-classifications below follow those typically used in most antenna engineering textbooks. [1] [2] [3 ...