On Auto, if the LNA maintained linearity, it would deliver 3 watts back into the NanoVNA.
NOT RECOMMENDED!
Safe guess the LNA will limit, but could still be enough power to damage the Nano.
You really need a supply of attenuators when testing amps on VNAs.? To limit input power levels to the amp to keep it linear, and on the output to protect the VNA.? ? ? Personally I like to use a signal generator and a Power Meter when testing an amp.
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On Thursday, February 29, 2024 at 07:45:37 AM CST, montanaaardvark <boblombardi@...> wrote:
On Wed, Feb 28, 2024 at 10:07 AM, Bruce KX4AZ wrote:
NanoVNA-H4
Level setting dBm
Auto -9.1
2 mA -9.1
4 mA -3.2
6 mA 0.2
8 mA 2.3
A related question is what power is acceptable on port 2 (of an H4)?? I have an LNA I wanted to measure the gain of but not having a large selection of attenuators I was afraid to do that.? It has 24 dB gain and I'm pretty sure any of those increased by 24 dB (if the amp could put that out without compressing) could be an issue.
I'm sure I should know this, but I don't.
Bob
___________
W4ATM - 35 miles south of the Kennedy Space Center
Retired RF Design Engineer, mostly PLL synthesizers & receivers, DC - 10GHz
Now retired and able to play with all those hobbies I hardly had time for.
