The regs changed, and old gear is grandfathered in.
The uBitx is new gear, should meet the -43dBc spec here in the USA.
Simple as that.
> What I did find was a procedure written by the IEEE which gave step by step how to test for the spurious emissions.??
Part 97 applies specifically to Amateur Radio, and specs -43dBc.? Search for "97.307" within this document:
? ??
Part 15 deals with RFI from non-licensed devices, and is a whole other kettle of fish.
? ??
Since such devices do not necessarily radiate on purpose, there may be no carrier to compare the emission with.
So the regs are written much differently.
Generally speaking, regs for Amateur Radio seem fairly lax.
Especially that grandfather thing.
And generally speaking, these particular regs seem pretty simple and self consistent.
Government regs can get a whole whole lot worse.? ?;-)
Jerry, KE7ER
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On Mon, Mar 11, 2019 at 09:51 AM, BruceN wrote:
Thanks Mark, Ashar and Curt.
Mark I did look but I didn't figure it would be in Part 97.? What I did find was a procedure written by the IEEE which gave step by step how to test for the spurious emissions.? But, if you look closely at what is written in what you highlighted, the emitted spurious power for a low power rig can be interpreted to be far lower than for a higher power transmitter.? In the second part, those dealing with transmitter installed before 2005, achieving this goal with a high power transmitter might be excrutiatingly difficult but may be easy to achieve with a low power transmitter.? In the first part, they are specifying according to suppression.? In the second part, they list the actual emitted power permitted.? Things are not equal.? It would be better is everyone measured using the same units.
And, yes, it can be such gibber when even the regulations don't seem to agree within the same paragraph.? I do realize they are addressing two different vintages but they are using two different measuring systems.
My additional nickel.
Bruce, K4TQL
