It arrived quickly in Hungary (in 11 days)._The device was very well packaged so I received it without damage._The package contains instructions for use._I bought it to calibrate my existing old frequency meter._The photos show the condition after calibration._Unfortunately, I do not have an officially calibrated very expensive frequency meter with which I could have checked its accuracy._baxsed on the videos I can find, I trust its accuracy._I left the antenna inside the building and so it found the GPS signal in about 15-20 seconds from the time it was turned on._Of course, this depends a lot on the building._The calibration is finished in about half an hour._The backlight of the display is a bit strong but I will fix it._The contrast of the displayed characters can be adjusted nicely._When you have finished the calibration and the ppb value is close to zero, you need to save the current pwm value in the menu._Then you can perform the calibration without an antenna baxsed on the saved pwm value, this is what the user manual says and it really works that way._I think you can calibrate more accurately with the continuous gps signal._Very good little device._Thank you.

It arrived quickly in Hungary (in 11 days). The device was very well packaged so I received it without damage. The package contains instructions for use. I bought it to calibrate my existing old frequency meter. The photos show the condition after calibration. Unfortunately, I do not have an officially calibrated very expensive frequency meter with which I could have checked its accuracy. Based on the videos I can find, I trust its accuracy. I left the antenna inside the building and so it found the GPS signal in about 15-20 seconds from the time it was turned on. Of course, this depends a lot on the building. The calibration is finished in about half an hour. The backlight of the display is a bit strong but I will fix it. The contrast of the displayed characters can be adjusted nicely. When you have finished the calibration and the ppb value is close to zero, you need to save the current pwm value in the menu. Then you can perform the calibration without an antenna based on the saved pwm value, this is what the user manual says and it really works that way. I think you can calibrate more accurately with the continuous gps signal. Very good little device. Thank you.

It arrived quickly in Hungary (in 11 days)._The device was very well packaged so I received it without damage._The package contains instructions for use._I bought it to calibrate my existing old frequency meter._The photos show the condition after calibration._Unfortunately, I do not have an officially calibrated very expensive frequency meter with which I could have checked its accuracy._baxsed on the videos I can find, I trust its accuracy._I left the antenna inside the building and so it found the GPS signal in about 15-20 seconds from the time it was turned on._Of course, this depends a lot on the building._The calibration is finished in about half an hour._The backlight of the display is a bit strong but I will fix it._The contrast of the displayed characters can be adjusted nicely._When you have finished the calibration and the ppb value is close to zero, you need to save the current pwm value in the menu._Then you can perform the calibration without an antenna baxsed on the saved pwm value, this is what the user manual says and it really works that way._I think you can calibrate more accurately with the continuous gps signal._Very good little device._Thank you.

Die Bestellung war in 10 Tagen bei mir. Habe den GPSDO sofort ausgiebig getestet und er ist gut , mach ungefähr einer halben Stunde ist der TXCO aufgeheizt und die PLL im Gleichgewicht . Dann hat er 10.000.000,0 Hz ( genauer kann ich nicht Messen ).

Die Bestellung war in 10 Tagen bei mir. Habe den GPSDO sofort ausgiebig getestet und er ist gut , mach ungefähr einer halben Stunde ist der TXCO aufgeheizt und die PLL im Gleichgewicht . Dann hat er 10.000.000,0 Hz ( genauer kann ich nicht Messen ).

Die Bestellung war in 10 Tagen bei mir. Habe den GPSDO sofort ausgiebig getestet und er ist gut , mach ungefähr einer halben Stunde ist der TXCO aufgeheizt und die PLL im Gleichgewicht . Dann hat er 10.000.000,0 Hz ( genauer kann ich nicht Messen ).