On Tue, Dec 17, 2019 at 9:23 AM Michael Maiorana <zfreak@...> wrote:
I'm just looking for a sanity check (please).
Square wave output from an Si5351 is 3.2V p-p unloaded. Into a 50 ohm resistive load it drops to 1.6V p-p. Average voltage of a square wave is 1/2 p-p value, so Vavg is 0.8V. Power into the resistor (assuming a pure square wave) is (0.8V)^2/50 or 12.8mw. Converting to dBm 10*(Log(12.8/1)) = 11dBm.
11dBm is more than enough to meet the 7dBm drive requirements of a diode ring mixer. However, I'm reading conflicting info on the Si5351's ability to directly drive a diode ring mixer.
Any advice or guidance will be greatly appreciated.
These little Si5351 demo boards from Ebay are amazing for the measly $3.50 that they cost. They have onboard linear LDO regulator and logic level converters so you can drive them direct from an Arduino running at 5V. 4 wires connected to an Uno and some sample code and I was making clocks in less than 10 minutes. What an age we live in!
