[Courtesy of Matt Deutch
"The antenna the 25 MHz [transmitter] is on right now is the original antenna it was on in 1977," Matt Deutch
, N0RGT, WWV's
lead electrical engineer, told ARRL.
"When the 25 [MHz transmitter] was shut down [that year], the radiating section was removed and tossed in the bone yard, and a new longer section put on the tower to make it a 15 MHz stand-by antenna."
said that when WWV
first reintroduced the 25 MHz broadcast in 2014, it used a broadband monopole.
It was later decided to use that antenna for WWV's
2.5 MHz stand-by transmitter, though.
"So, we decided to rebuild the 25 MHz antenna," he
"A few weeks ago the boys dug the 25 MHz radiating section out of the mud in the bone yard and rebuilt the 25 MHz antenna, so that it looks identical to what it looked like in 1977."
The WWV campus in Fort Collins, Colorado. [Courtesy of NIST]
said the 25 MHz WWV vertical dipole now is coupled to its own, dedicated transmitter, radiating 2.5 kW "with near zero watts reflected," he
added, and modeling has showed that the dipole exhibits a lower angle of radiation than the broadband monopole did.
"There is no automatic backup transmitter for 25 MHz at this time," Deutch
The 25 MHz WWV signal had been operating at about 1 kW for the past 16 months.
has said that WWV
has received reports on the 25 MHz signal from across the Atlantic.