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| A. '''''This demonstration requires a minimum 24 hour notice.''''' * '''''This demonstration requires LN2''''' * '''''Back-to-Back lectures is NOT possible; We'll do one lecture one day and the other the next day.''''' |
A. N/A |
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| 1. Make a Setup check list. 1. ... |
1. N/A |
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| 1. List any Warnings.... 1. Demonstration may require practice. |
1. N/A |
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| Insert description of demonstration, how is the demonstration preformed. | The telephone at 1-303-499-7111 or the web site works the best, because the WWV receiver has a hard time receiving the stations in the building. The National Bureau of Standards maintains two radio transmitting stations, WWV at Ft. Colonies, Co., and WWVH near Kekaha, Kauai (Hawaii), for broadcasting standard radio frequencies of high accuracy. WWV broadcasts are on 2.5, 5, 10, 15, and 20 MHZ. The broadcasts of both stations are continuous night and day. Standard audio frequencies of 440, 500, and 600 Hz on each radio carrier frequency by WWV and WWVH. The duration of each tone is approximately 45 seconds. A 600 Hz tone is broadcast during odd minutes by WWV, and during even minutes by WWVH. A 500 Hz tone is broadcast during alternate minutes unless voice announcement or silent periods are scheduled. A 440 Hz tone is broadcast beginning one after the hour by WWVH and two minutes after the hour by WWV. The 440 HZ tone period is omitted during the first hour of the UT day. GEOPHYSICAL ALERTS "Geoalerts" are broadcast in voice during the 19th minute of each hour from WWV and during the 46th minute of each hour from WWVH. The messages are changed each day at 0400 UT with provisions to schedule immediate alerts of outstanding occurring events. Geoalerts tell of geophysical events affecting radio propagation, stratospheric warnings. etc. They also broadcast WWVB on 60 KHz. (13 KW) giving standard time signals, time intervals, and UIT correction by means of a BCD time code. |
[:PiraScheme#Mechanics: Table of Mechanics Demonstration] |
[:MEEquipmentList: List of Mechanics Equipment & Supplies] |
[:Demonstrations:Lecture Demonstrations] |
WWV Signal, 1A10.45
Location:
Cabinet: [:MechanicsCabinet:Mechanic (ME)]
Bay: [:MechanicsCabinetBayA3:(A3)]
Shelf: #6
attachment:WWVRadioI-01-400.jpg
Description:
The WWV signal broadcasts information about time and frequency all across the country. There are a number of different ways to access the NIST WWV signal: by radio, by phone, or By the web. It is an example of precise unit standards.
Equipment |
Location |
ID Number |
|
|
|
WWV Radio Receiver A |
[:MechanicsCabinetBayA3:ME, Bay A3, Shelf #6] |
1A10.45a |
WWV Radio Receiver B |
[:MechanicsCabinetBayA3:ME, Bay A3, Shelf #6] |
1A10.45b |
WWV Telephone |
[:MechanicsCabinetBayA3:ME, Bay A3, Shelf #3] |
1A10.45c |
Important Setup Notes:
- N/A
Setup:
- N/A
Cautions, Warnings, or Safety Concerns:
- N/A
Demonstration:
The telephone at 1-303-499-7111 or the web site works the best, because the WWV receiver has a hard time receiving the stations in the building.
The National Bureau of Standards maintains two radio transmitting stations, WWV at Ft. Colonies, Co., and WWVH near Kekaha, Kauai (Hawaii), for broadcasting standard radio frequencies of high accuracy. WWV broadcasts are on 2.5, 5, 10, 15, and 20 MHZ. The broadcasts of both stations are continuous night and day. Standard audio frequencies of 440, 500, and 600 Hz on each radio carrier frequency by WWV and WWVH. The duration of each tone is approximately 45 seconds. A 600 Hz tone is broadcast during odd minutes by WWV, and during even minutes by WWVH. A 500 Hz tone is broadcast during alternate minutes unless voice announcement or silent periods are scheduled. A 440 Hz tone is broadcast beginning one after the hour by WWVH and two minutes after the hour by WWV. The 440 HZ tone period is omitted during the first hour of the UT day.
GEOPHYSICAL ALERTS "Geoalerts" are broadcast in voice during the 19th minute of each hour from WWV and during the 46th minute of each hour from WWVH. The messages are changed each day at 0400 UT with provisions to schedule immediate alerts of outstanding occurring events. Geoalerts tell of geophysical events affecting radio propagation, stratospheric warnings. etc.
They also broadcast WWVB on 60 KHz. (13 KW) giving standard time signals, time intervals, and UIT correction by means of a BCD time code.
attachment:WWVRadioII-02-250.jpg |
attachment:WWVRadioI-01-250.jpg |
attachment:WWVPhone02-250.jpg |
attachment:WWVRadioI-02-250.jpg |
References:
1.[http://www.nist.gov/pml/div688/grp40/wwv.cfm NIST Website]
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