I've build a simple distribution amplifier for my GPSDO.
The distribution amplifier is based on the work of Dieter, DF9NP. His PCB contains an amplifier for 10MHz with four identical outputs. The amplifier is driven by the 10MHz sine-wave output of the GPSDO.
Three outputs of the amplifier are routed to 2xBNX and 1xSMA sockets. The forth output is routed to a simple Sine to TTL converter.
!!! more pictures will come in the near future !!!
I've hooked up one ouput of the distribution amplifier to a spectrum analyser to check the harmonics.
First harmonic is nearly 49dB down the 10MHz carrier. I think for the simple filtering this is pretty good. But compared to the output of the GPSDO
this is pretty worse. The GPSDO delivers a really fine signal!
Sine to TTL converter
The converter is based on the work of DATUM. Please check the schematic on page 18 of the PDF.
Measuring with 1M scope probe gives a full swing . As the supply voltage is 6VDC, the output reaches about 5.7VDC ... a liitle bit too high for TTL - I think a some diodes in series with the supply voltage will fix this.
The spectral purity is not so high ;-)
Compared to the square signal from my Siglent SDG2024X it is pretty worse ...