The resurrected 25-Mhz Signal of time and frequency standard station WWV is now emanating from a circularly polarized turnstile antenna. WWV had used a vertically polarized antenna on 25 MHz in the 1970s. Silent since 1977, the 25-MHz signal returned to the air on an "experimental basis" in April 2014, and it's been transmitting ever since — initially on a broadband discone until August 2015, when it switched back to a vertical, which it used until the July 7 switch to circular polarization.
More at :
http://www.arrl.org/news/wwv-25-mhz-signal-swapped-to-circular-polarization
and
https://www.nist.gov/pml/time-and-frequency-division/radio-stations/wwv
Current 25 MHz Broadcast Specifications
As of 2042 UTC 7 July 2017 the 25 MHz broadcast is now on a turnstile antenna with circular polarization and will remain in this configuration until after the solar eclipse on 21 Aug 2017. Signal reports are requested.
Schedule: typically continuous. As an experimental broadcast, the 25 MHz signal may be interrupted or suspended without notice.
Radiated Power: 2.0 kW
Antenna: Experimental Turnstile
Listener comments and reception reports may be emailed to: [email protected](link sends e-mail), or sent via postal mail to:
National Institute of Standards and Technology
Radio Station WWV
2000 E. County Rd. 58
Fort Collins, CO 80524
