FE-5680A Rubidium standard

Hello,

my new rubidium frequency standard unit FE-5680A arrived finally.

After some time of "idle" mode in box on the shelf I found the time to remove it and check. As I am planning to install it in my ham radio shack as main reference > here is first short test and some quick measurement.

After heating up and locking the temperature stabilized and stay around +63C...

The first what I wanted to see was the sine wave curve and then quick frequency drift check.

As the start-up of the unit seemed to be as it should and all parameters also I tried to measure the drift in few hours after locking it in order to verify the short term stability of this unit.

The technical specification at glance:

FE-5680 Tech Manual Table 3, Sheet 9 (PDF page 10/19):

• Frequency 10 MHz
• Type Sinusoidal
• Amplitude (minimum) 0.5 Vrms into 50O(+7dBm)
• Adjustment Resolution <1 x 10-12 over range of 3.8 x 10^-5
• C-field potentiometer Resolution 1 x 10^-11 over range of 3 x 10^-9
• Drift: 2 x 10^-9 per year, 2 x 10^-11 per day
• Short Term Stability: 1 sec … 100 sec 1.4 x 10^-11 t
• Retrace 5 x 10^-11
• Phase Noise (f_o=10 MHz) @10 Hz: -100 dBc, @100 Hz: -125 dBc, @ 1000 Hz: -145 dBc
• Input Voltage Sensitivity 2 x 10^-11 (15V to 16V)
• Frequency vs.Temperature (-5C to +50C) ±3 x 10^-10
• Spurious Outputs -60 dBc
• Harmonics -30 dBc
• Loop Lock Indication: > 3Vdc=Unlocked, < 1Vdc=Locked
• Input Power (@25 C) 11 watts steady state, 27 watts peak
• DC Input Voltage/Current
• 15V to 18V @ 1.8A peak and 0.7A steady-state
• …(except Opt 25: +22V to +32V @ 1.25 peak, 0.5A steady-state)
• Ripple +15V: < 0.1Vrms
• Warm-up Time < 5 minutes to lock @ 25C
• Size: 25 x 88 x 125 mm, .98 x 3.47 x 4.92 inches
• Weight 434 grams, 15.3 oz.

 

An excellent related informations sources are here:

www.ka7oei.com
www.freqelec.com
http://www.vk3um.com/Rubidium%20Standard.html


Petr, OK1RP