Both elektor and EPE has made projects based on the MAX038. You can check on epemag (july2001??) and elektor had it in a # from 1995 06?.
The elektor project I built myself, I have only got it to work correctly with freq <2.5MHz, it gives freq > 10Mhz. One reason that the signal is crappy can be my loosy oscilloscope... there are freq components above 100MHz
If you like I can see if I can find the magz , here are some links: