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Portable Frequency Standard 7370

The 7370 is a cost effective and fully portable GPS Synchronised Frequency Standard, which will continue to operate for up to 8 hours without the connection of its GPS and power.

The instrument has fully automatic battery recharging and oscillator calibration overnight, using optional fixed antenna, or while travelling (via in-car charger lead and magnetic base GPS antenna).
GPS Precision Time & Frequency Standard 1804

GPS Precision Time & Frequency Standard 1804

The 1804 is a Precision Time and Frequency reference using signals from the GPS satellite constellation. Applications include digital audio and TV transmitters, cellular communications. satellite ground stations, calibration laboratories and any application where accuracy and continuous availability are critical.
more details
http://www.pendulum-instruments.com/eng/htm/freqstand.php?gclid=CJvOm-mw8JcCFQ2OTAodE0SFCg

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Posted by waqasahmad

Some standards frequencies are shown below

http://tf.nist.gov/timefreq/general/pdf/1746.pdf

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Posted by Hash007

Standard Frequency is a frequency with a known relationship to a frequency standard.

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Posted by HamidAliKhan

For details:

en.wikipedia.org/wiki/Frequency_standard

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Posted by sagitraz

A frequency with a known relationship to a frequency standard.

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Posted by alwin