What is the GPSDO and what benefit does it provide?

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  • Updated 6 years ago
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First, an explanation of what a GPSDO is: Most oscillators that are used
as the frequency reference for a radio will drift over time. If you
purchase a radio with a crystal oscillator, a temperature controlled
crystal oscillator (TCXO) or an ovenized crystal oscillator (OCXO), you
will notice that over time these will drift. An adjustment is required
every six to twelve months to keep them on frequency. ALl these crystal
oscillators have excellent short term stability but poor long term

The GPS system is designed to keep time very accurately, but at the
multi-nanosecond range. Over time, GPS has perfect stability (long term),
but in the short term it is a fairly poor reference.

A GPSDO combines the best of both of these worlds: It uses a base
oscillator with good short-term stability (a TCXO) and then uses a GPS to
adjust it over time, or discipline it, to stay on frequency. With a GPSDO
you have excellent short and long term stability.

The optional GPSDO in the FLEX-6000 Signature Series radios provides both
frequency and time information to the radio. The 10MHz output of the GPSDO
is used as the reference for the master clock in the FLEX-6000 ensuring the
radio is always on frequency. The time information can be used in the
future for a number of situations where time information is important in
communications and station operation.
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Tim - W4TME, Customer Experience Manager

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  • on frequency

Posted 6 years ago

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James Kennedy-WU5E

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can the GPSDO be installed my 6500 after I get it by me?
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Tim - W4TME, Customer Experience Manager

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Yes, the GPSDO is an option that can be installed by the user.