It's "my understanding" the rules apply only to equipment built
specifically for the amateur service.
IOW, you can adapt anything that was not meant for the amateur service
and you are "supposed to keep the power output at, or below the legal
limit. .Emtron amps were imported for some years. The DX-2sp and 3sp
will run the legal limit, any mode with no time limit. . They come with
either a single Chinese FU728F, or two. Then there is the 5K which I
think runs a 4CX5000.
The DX-2sp and 3sp will also run 4CX1500s as they have a filament tap
for them. The centering pin on the socket has been turned down a couple
thousandths so the 1500s fit right in. Just adjust the bias.
They had enough gain and power capabilities that they could not be
manufactured here, but you could import as many as you could afford. The
FCC is looking at dropping the gain limitation.
The problem with Tetrodes is too many hams tune them like a triode.
Also, some rigs when run at reduced power have a full power leading edge
spike.
So, based on experience, "I believe" you can modify, or adapt almost
anything to use on the ham bands.
73
Roger (K8RI)
On 12/4/2016 8:59 PM, Bill Turner wrote:
Something just occurred to me about the Harris RF-110A:
Is it legal for amateur use? It is certainly commercially built but
apparently not FCC type-accepted. Way too much gain for example.
You can homebrew something like that with no problem, but commercial
is a different matter.
Lawyers, what say you?
73, Bill W6WRT
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