[Elecraft] Elecraft gear relative IMD

[Ron D'Eau Claire]

The FCC here in the USA does not require having a rig that meets state of
the art specs, either for Amateur or many commercial applications. 

When checking shipboard radio installations in preparation for their annual
FCC inspections, I used a variety of different specs the gear had to meet
based on its year of manufacture. Older gear had a lot looser specs than the
newer stuff. 

The same is true for Ham rigs. It's perfectly okay to run an old Heathkit
AT-1 or a 1930's homebrew rig with cathode keying today as it was back then,
even though the keying bandwidth will be substantially greater than modern
rigs. 

The bottom line is to make sure the rig you have is being operated to
produce the cleanest signal its design allows in the mode of operation being
used.

That's why double-sideband amplitude modulation is still legal even though
it requires more than twice the spectrum of an SSB signal and CW is still
allowed even though SSB and the various digital modes provide the same
information in yet smaller bandwidths.   

73, Ron AC7AC