[time-nuts] FE 5680A Warning

Tim timt at skybase.net
Mon Nov 14 16:37:28 EST 2011


Hi All,

Just a few words on the different types of FE5680.

The types requiring 5v on one of the pins only have a simple L C filter 
to "sine" up the square wave and are only suitable for locking digital 
devices. The variants with the SMA or single 15v supply have a multipole 
band pass filter for 10 Mhz and produce a far cleaner output suitable 
for locking LO's for radios.

Looking at the output of the +5v types on an oscilloscope you will quite 
clearly see that the sine wave is not quite right. Pluggin them into a 
spectrum analyzer will show harmonics stretching out 100Mhz+ from the 
fundamental.

If your intent is to use one of these as a basis for locking LO's for 
radio work make sure you use a clean one :)

regards

Tim

-- 
VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT





More information about the time-nuts mailing list