Rick,
You are correct, an amplifier without low pass filtering will generate
harmonics - unless it is a *very* expensive instrumentation amplifier -
you might find one in a test lab, but most likely not in a ham station.
It is not legal to *sell* those kind of amplifiers in the US (and I
assume many other countries).
However, an amateur can purchase one of these and add his own low pass
filters and that is entirely legal.
Any amateur radio station in the US must assure that his transmitted
signal is clean and meets FCC requirements. The amateur is individually
responsible for the quality of the signal he transmits. Anyone who has
passed his amateur exam should know that.
For that reason, I will not allow my call to be used at Field Day unless
they also use my transceiver(s).
73,
Don W3FPR
On 7/27/2016 2:21 PM, rick jones via Elecraft wrote:
First of all, I'm NOT entertaining purchasing one, I'm happy with my 100W K3. I've been
away from the hobby for a while and I'm catching up on a few things. I'm noticing quite a
few add on amplifiers targeting the portable crowd on the auction site. Most are
originating from China. Many show an internal picture and I do not see any obvious forms
of LP filtering. Is it legal to run one of these amps without FCC acceptance? If the
answer is "no" then is an effort being made to educate people why these amps
may be causing harm to the airwaves (in the test question pool, for instance)? Hams,
being a notoriously thrifty lot, may be attracted to the low price but may not be aware
of, or have the ability to monitor their own signals. I'm not trying to stir up any wars,
I'm simply curious about the proliferation of cheap equipment of questionable quality
control and if there has been a noticeable change to the bands over the years.
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