I apologize Zach, one more try on this, Looking at the output of the Si5351a on an oscilloscope, the Peak to Peak voltage unloaded (10x Probe at 1Meg Ohm) directly reads 3.3 Volts. However, the voltage swing goes from POSITIVE 1.67 volts to NEGATIVE 1.67 volts Do you see the same thing with your Si5351 PLLs? I was thinking that a square wave should go from 0 to 3.3volts, but apparently it does not in this PLL. You know what I'm going to ask! 1.67 Volts is not enough, at least in the chip I have to make a 74ac244 chip to go high in my case (Input High = Vcc - .5V) What am I missing?

The current voltage in all the ZachTek transmitters runs at 5 volts and with all the gates in parallel allows for the 200+ milliwatt output. One of the notes on the transformer after the line driver is that the transformer will also increase the output voltage. Let's say we didn't want to run at 200+ milliwatts, but maybe 50-100 milliwatts after the line driver. Couldn't we just run the Line driver at 3.3 Volts, keeping everything else the same?

Hello, I have worked with the Quectel L80-R Module before, and I could never get a fix very well. I've tried indoors and outdoors just didnt want to connect Anybody have the Zachtech WSPR Transmitter: I was wondering what the fix time performance you are getting thanks , Jeff

The line driver or non-inverting buffer appears to have a 5 Volt Limit. I'm curious if I were to use a 9 Volt source and drive the PA that way, with something like: https://www.digikey.com/product-detail/en/on-semiconductor/MC14050BDR2G/MC14050BDR2GOSCT-ND/1139669 Which has an 18 Volt upper limit, do you think that would work as an alternative? 73 W8ZLW