Hi,
I have recently acquired a "home made" GPSDO which, beside the 10 MHz sine wave output, also provides 10 MHz, 5 MHz and 1 MHz square wave outputs.
The thing I find rather curious is that, for the three square wave outputs, the in-series output resistors are 220 Ohms, rather than the typical 50 Ohms (please see attached picture).
Could someone please explain why/when someone would use a 220 Ohms output impedance?
Thanks!