On 6/7/22 5:25 AM, Rich NE1EE wrote:
On 2022-06-07 00:07:-0700, you wrote:
FYI - I made an output voltage measurement based on the "Px" settings (on my H4, fw v1.2 from the release .dfu file, o'scope w/ 50ohm input, CW=10MHz, square wave:
The CW frequency was -520Hz off at 300MHz here, so I had to adjust the 26MHz reference frequency a little bit..
Thanks for posting those. I guess that Auto would somehow adjust the current based on reflected (or thru) values to try to keep the reflected (or thru) values in some range?
520 Hz in 300 MHz seems like a lot...are they all that far off? I should see if I can check mine. That would definitely have an impact on using it for a signal generator.
that's a bit less than 2 ppm. That's pretty good for an inexpensive TCXO.? If you want to hack, you might be able to put a voltage on the trim input, but that could actually make things worse. You're probably better off just programming it for a frequency that is 520 Hz different.
