Thanks, Aaron!??? Saving your emails in my notes.?? Also I'll pass along and discuss with WB3EFT (Bob Melville). ? --Connie
On Wednesday, January 15th, 2025 at 12:30 AM, Aaron Heller via groups.io <ajheller@...> wrote:
I hooked my tinySA up to my nanoVNA and it looks like the signal is at -10 dBm, 0.1 mW. I was just looking up requirements for spurious emissions for different project (testing the $10 1-3 W amplifier modules you find on Amazon and Ebay). It's covered in 47 CFR 97.307 (d)
which says that for modern equipment operating below 30 MHz, spurs need to be no more than -43 dB relative to the carrier (dBc). So for a kilowatt PA (+60 dBm), that's 17 dBm or 50 mW. That's consistent with what Jeff said.
That said, it wouldn't be hard to confine the sweeps from the nanoVNA to the ham bands.
Aaron, AK6IM
On Fri, Jan 10, 2025 at 3:15?PM Jeff Reagan via <jeffreagan=
[email protected]> wrote:
Rules are more relaxed below 100 milliwatts, I'm pretty sure.
On Fri, Jan 10, 2025 at 1:51?PM Connie W6EFI via <stillinger=
[email protected]> wrote:
serious question ¨C ¨C if you sweep an antenna with a nanoVNA on frequencies outside of your license privileges, are you a lawbreaker?
I know there are some limits on power before licensing becomes an issue. and I'm pretty sure this was addressed on one of the licensing exams so now I've got some homework to do.
thanks again,
73 Connie W6EFI.
On Fri, Jan 10, 2025 at 13:31, Connie W6EFI via <
stillinger@...> wrote:
I did not know that. That is definitely worth a cautionary note.
On Fri, Jan 10, 2025 at 13:12, Ron, N6YWU via <
ron.nicholson@...> wrote:
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX. Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
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Connie KN2EFI
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Connie KN2EFI
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Connie KN2EFI
