NIST Radio Station WWVH as it sounded in the 1980s


Many thanks to SRAA contributor, Myke Dodge Weiskopf, who shares the following recording and notes:

NIST Radio Station WWVH as it sounded in the 1980s. To contrast with other recordings of the WWVH station ID, note that announcer Jane Barbe does not say (her now-famous) “Aloha!” at the end of this version.
This recording was found at WWVH in 2015 on an undated cassette labeled “JB on Old Audichron TCG” (which stands for Time Code Generator, the device which reconstructs and plays back Jane’s voice over the air). As such, the precise broadcast year is not known, but it is consistent with the voice and broadcast format of the 1980s, until the introduction of the short-lived digital voice in 1991.
An excerpted version of this recording is found on "At the Tone: A Little History of NIST Radio Stations WWV & WWVH." This unedited version is being shared by special arrangement for the Shortwave Archive.

WWV Time Station (15 MHz): November 3, 2017


Many thanks to SRAA contributor, Emilio Ruiz, who shares the following recording of WWV and notes:

Sad for the news, the closing of WWV is like close a park, a comunity place where scientifics and enthusiast of radio could learn and experiment not only about time, radio propagation too. I not have much money for bought radiofrecuency equipment for repair or make my own radios, i use WWV for that. 
To go to the future it is not necessary to destroy the past, I'm teaching to children about science and technology and when talk about radio share with they the listen of WWV with old radio receiver (BC-548Q), for they the sound of ticks and the history about radio and time is a amazing topic.
I wrote this review (in Spanish) about WWV for those SWListeners and Radio Amateurs who do not spoke English,--I think can be useful.
I hope radioamateurs of U.S. can reverse the decision.
Broadcaster: WWV
Date of recording: 11/3/2017
Starting time: 14:00
Frequency: 15000 kHz
Reception location: Chiapas, México.
Receiver and antenna: Dipole antenna, Keenwood R-600

Radio Reloj: August 30, 2015

Many thanks to SRAA contributor, Richard Langley, who notes:

Live recording of Radio Reloj (CMBD), Havana, Cuba, on 30 August 2015 beginning at about 15:55 UTC on a frequency of 950 kHz. The signal originates from a 10 kW transmitter at Arroyo Arenas / San Augustin, near Havana, using the Centros Transmisores de Ondas Medias 1 (CTOM1) non-directional antenna facility.

(Radio Reloj can be heard on various frequencies in the AM and FM bands in Cuba and live on the Internet at 

The recording, in Spanish, is a typical Radio Reloj broadcast with two announcers alternately reading news bulletins accompanied by time signals. The announcers identify the station and verbally give the local time each minute. In addition to the verbal station identification, each minute either the letters RR in morse code (using 1800 Hz tones) are transmitted or five-note chimes (D4, G4, B4, D5, B4) are played. The chimes sound like those of a dinner chime or even some door bells and are reminiscent of the U.S. National Broadcasting Company (NBC) chimes. On a couple of occasions in this recording, during a particular minute, neither the morse code nor the chimes are used and sometimes, during a particular minute, both are used. In this recording, we can also hear at some minutes pairs of tones being played going up and down the scale as news headlines are read. On other occasions, three- and four-note chimes in various sequences have been heard (perhaps at the announcers' whim).

Different tones identify each second, minute, and five-minute epochs. Based on measurements, each second is marked with a "seconds tick" consisting 10 cycles of a 1000 Hz tone (0.01 seconds duration). Minutes, except for multiples of 5 minutes, are marked by 172 cycles of a 1000 Hz tone (0.172 seconds duration). Every 5 minutes, the marker is extended to 672 cycles of a 1000 Hz tone (0.672 seconds duration). The minute and 5-minute markers are preceded by 5 cycles of a 1000 Hz tone, followed by 0.013 seconds of silence.

The time signals in this particular broadcast were well within one second of the time given by a computer's clock synchronized to the U.S. time standard using Network Time Protocol. 

The broadcast was received on a Tecsun PL-880 receiver with its built-in loop antenna in Key West, Florida, using an RF bandwidth of 5 kHz. The receiver was oriented for maximum signal strength. Signal quality is generally good. However, there are repeated static crashes (QRN) from thunderstorms in the region.

Richard also notes that he was located in Key West, Florida, using  a "Tecsun PL-880 receiver with built-in loop antenna using an RF bandwidth of 5 kHz. The receiver was oriented for maximum signal strength." 

1981 & 1982: Various International Time Signal Stations

One of four WWV time code generators in late August, 2014 (Photo: Thomas Witherspoon)

One of four WWV time code generators in late August, 2014 (Photo: Thomas Witherspoon)

Many thanks to SRAA contributor, Tom Laskowski, who shares the following recordings he has transferred from audio cassette. Tom includes the following notes:

I combined several audio files of some of the common time signal stations available back in 1981 and 1982 into one clip. These were made using a DX-302 which had poor image rejection and you can hear some stations behind WWV which shouldn't be there, such as RCI's interval signal at one point.

00:00 - VNG, Australia - August 16, 1981 on 12.000 MHz at ???? UTC
03:02 - LOL, Argentina - October 15, 1981 on 15.000 MHz at 2349 UTC
07:27 - BPM, China - January 16, 1982 on 10.000 MHz at 1255 UTC
08:38 - ZUO, South Africa - December 18, 1982 on 5.000 MHz at 0329 UTC

Recording the 2015 Leap Second via WWV and CHU: June 30, 2015

OOne of four WWV time code generators in late August, 2014

OOne of four WWV time code generators in late August, 2014

Yesterday, I posted a brief article about the leap second that occurred between 23:59:59 June 30, 2015 and 00:00:00 UTC July 01, 2015.

I decided to record the leap second on as many shortwave time station frequencies as possible. The only viable options for me--based on time of day and my reception location--were the WWV frequencies 10, 15, 20, and 25 MHz, and CHU frequencies 7,850 and 14,670 kHz.

I was able to monitor four different time station frequencies simultaneously on the TitanSDR Pro. (click to enlarge)

I was able to monitor four different time station frequencies simultaneously on the TitanSDR Pro. (click to enlarge)

Unfortunately, HF propagation was very poor yesterday, so the higher WWV frequencies--20 and 25 MHz--were completely inaudible, as was CHU on 14,670 kHz. There were numerous thunderstorms in our area, so static crashes were prevalent.

Still, since this was a first attempt to record a "leap second," I didn't want to take any chances.  I had the Titan SDR Pro monitoring and recording two CHU and two WWV frequencies [screenshot], the Elad FDM-S2 recording WWV on 15 MHz [screenshot], and the WinRadio Excalibur on WWV's 10 MHz frequency, as well as recording the whole 31 meter band spectrum [screenshot].

In the end, the strongest frequencies I captured were CHU on 7,850 kHz and WWV on 15,000 kHz. WWV on 10,000 kHz was much weaker than normal and the band was quite noisy--still, it's readable, so I included this recording, too. Recordings follow...


The sign above WWV's primary 10 MHz transmitter (2014).

The sign above WWV's primary 10 MHz transmitter (2014).

All of the recordings start just before the announcement of 23:59 UTC.

WWV added the extra second and higher tone, then continued with their top of the hour announcements, including a note about leap second (which begins after the 00:04 announcement). CHU's adjustment included a long second tone and period of silence.

WWV on 15,000 kHz using the Elad FDM-S2:

CHU on 7,850 kHz using the TitanSDR Pro:

WWV on 10,000 kHz using the WinRadio Excalibur:

One interesting note about the 10 MHz WWV recording above: I believe I may be hearing BPM China in the background. I'm curious if anyone can confirm this because I don't know BPM's cadence/pattern well enough to ID it.